Gale Warning
As of today, there is no Gale Warning Issued.

Weather Advisory
As of today, there is no weather Advisory issued

Dams Water Level Update
As of 6AM, 19 September 2017

General Flood Advisories - Regional
As of  7PM, 19 September 2017 

Daily Basin Hydrological Forecast
Issued 19 September 2017

Monthly Climate Assessment and Outlook

Issued: 03 September 2017

Monthly Rainfall Forecast
RAINFALL FORECAST  (September 2017 - February 2018) 
UPDATED: 18 August 2017 (next update September 2017)

Regional Rainfall Forecast
Issued: 18 August 2017
Valid for: September 2017 - February 2018
Farm Weather Forecast and Advisories
ISSUED              : 8AM, MONDAY, SEPTEMBER 18, 2017
FWFA:  N0. 17-262

Ten-Day Regional Agri-Weather Information
DEKAD NO. 26 SEPTEMBER 11-20, 2017

The weather systems that will affect the whole country are southwest monsoon, intertropical convergence zone (ITCZ), low pressure area (LPA), Tropical Depression Maring and Typhoon Lannie.
Seasonal Climate Outlook
Issued:  06 July 2017
FOR July - December 2017

Astronomical Diary
Issue for September 2017
Autumnal equinox will occur on September 23 at 4:02 a.m...

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Telescoping and stargazing 
The PAGASA Astronomical Observatory is located inside the campus of the University of the Philippines, Diliman, Quezon City, conducts stargazing and telescoping sessions to interested astronomy enthusiasts, upon request. The session can either be conducted at the Observatory or at a specified venue of the requesting party/ individual. Letter of request should reach the Office of the Chief, Space Science and Astronomy Section, at least two weeks earlier than scheduled time, especially those, which will be conducted outside the PAGASA Observatory to allow the processing of necessary documents. The request letter can be addressed to:

Dr. Vicente B. Malano
Acting Administrator, PAGASA
Science Garden
Agham Road, Diliman
Quezon City, Philippines 1100

ATTENTION: Engr. Dario L. dela Cruz
                       Chief, SSAS

During the previous years, the 30-cm reflector-type telescope, which was permanently installed at the Observatory dome, is being used for the telescoping sessions. However, in May 2001, the Japanese Government donated a computer-based 45-cm telescope and was installed at the Observatory. Starting on February 16, 2003, the start of the celebration of the National Astronomy Week, the telescope is open for public use, after a series of adjustments made by the Japanese technicians.

Provided that the sky is clear, visitors can expect to have a glimpse of the famous bright stars like Vega and Sirius during the stargazing session. Planets such as Jupiter, Venus, Saturn, Mercury and Mars, including their satellites and the Moon can also be observed.

For residents of the cities of Davao, Cagayan de Oro, Cebu and Legazpi, stargazing and telescoping sessions can also be conducted at the PAGASA regional centers located in their area. One (1) 25-cm telescope in each of the above-mentioned sites are available for use. These telescopes were procured in May 1998 through the Grant-in-aid (GIA) project of the Department of Science and Technology (DOST), which is entitled "Promotion of Astronomy".

Stars and Constellations

Stargazing during the month will give fine display of celestial bodies such as stars and constellations after sunset and before sunrise. The famous Summer Triangle of the stars Vega, Deneb and Altair of the constellations Lyra, Aquila and Cygnus respectively, is well placed above the eastern horizon, as shown in Figures 1 & 1a.

This month, the rich band of constellations and stars along the Milky Way from the constellations Cygnus, the Swan, in the north to Sagittarius and Scorpius in the south, begin to give way to fainter constellations, many of them with watery associations such as the constellations of Capricornus, the Sea Goat; Aquarius, the Water Bearer and Pisces, the Fish. The famous asterism Teapot in the sky of the constellation Sagittarius can be observed at about 40 to 45 degrees above the south southeastern horizon as also shown in the said Figures.

Fig 1Figure 1
(click to view image)
Fig 1aFigure 1a
(click to view image)


The equinoxes are the only times when the solar terminator (the "edge" between night and day) is perpendicular to the equator. On an equinox, day and night are of approximately equal duration all over the planet. They are not exactly equal, however, due to the angular size of the sun and atmospheric refraction.

Autumnal equinox will occur on September 23 at 4:02 a.m. Hence, thereafter, Philippine nights will be longer as the Sun moves below the celestial equator towards the southern hemisphere.

Figures 2 and 2a represent the position of the Earth and Sun during Solstices and Equinoxes.

Fig 2Figure 2
(click to view image)
Fig 2aFigure 2a
(click to view image)

Planets Whereabouts

On September 1, at 5:00 A.M., planet Venus will be observed at about 21 degrees above the east northeastern horizon. It will lie among the background stars of the constellation Cancer, the Crab and will be shining brilliantly at magnitude -3.96. It will remain visible in the early morning sky throughout the month.

At 7:00 P.M., Jupiter and Saturn will be seen at about 20 and 53 degrees above the west southwestern horizon and lie among the background stars of the constellation Virgo, the Virgin and Ophiuchus, the Serpent Holder and will be shining at magnitude -1.74 and +0.42, respectively. These giant planets in the solar system become a good target for astrophotography that will reveal atmospheric features and their satellites using a DSLR camera mounted on a modest- sized telescope under a clear sky condition.

At 10:00 P.M., Neptune and Uranus will be observed at about 52 and 18 degrees above the east southeastern horizon, with magnitudes of +7.82 and 5.73, respectively. Neptune will lie among the background stars of the constellation Aquarius, the Water-Bearer, while Uranus lurks among the background stars of the constellation Pisces, the Fish. Observing Neptune and Uranus will require a binocular or a telescope and a starmap under dark and clear sky condition.

On September 17 at 5:20 A.M., an attractive arrangement of celestial bodies as the Waning Crescent Moon along with the three (3) planets, Venus, Mars and Mercury, line-up on the east northeastern horizon. The Moon will be found at about 34 degrees and Venus at 22 degrees above the horizon. Mercury and Mars are on the same line of sight with a separation of only 5 minutes of an arc and will be observed at about 10 degrees above the east northeastern horizon.

Figure 3 shows how to compare apparent magnitudes of celestial bodies such as planets and stars.

Fig 3Figure 3
(click to view image)


5  Mercury stationary 12:00 AM
5  Jupiter 3° N of Spica 7:00 PM
12  Mercury greatest elongation W (18°) 6:00 PM
12  Aldebaran 0.4° S of Moon 9:00 PM
14  Moon at perigee
 (nearest distance to Earth = 369,887.594 km)
 12:06 AM
17  Mercury 0.06° N of Mars 2:00 AM
19  Mars 0.1° S of Moon (occn.) 4:00 AM
27  Moon at apogee
 (farthest distance from Earth = 404,275.862 km)
2:50 PM
27  Vesta in conjunction with Sun 10:00 PM

Chief, RDTD

25 August 2017
For more information, call:

Chief, Space Sciences and Astronomy Section (SSAS), (RDTD)
Tel/Fax Nos. 434-27-15

Issue for September 2017
Autumnal equinox will occur on September 23 at 4:02 a.m...

The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) is mandated by law, as the government agency tasked to keep and disseminate the Philippine Standard Time (PhST). 

The PAGASA Astronomical Observatory which is located inside the campus of the University of the Philippines, Diliman, Quezon City.  It is equipped with a 45-cm. computer-based telescope donated by the Japanese Government thru its cultural- grant-aid program.  It is the biggest ever acquired by the PAGASA since the establishment of the observatory in 1954 and is now the largest operational telescope in the country.  It is very powerful that astronomers and astronomy enthusiasts may now conduct effective observations of stellar bodies and other distant space objects.

The Planetarium at the Science Garden has an 88-seating capacity.  It offers an ideal setting for all kinds of cosmic educational tours, whose most important task is to give the scientific concept of the Universe to the general public, and to elementary and high school students.  This concept includes the size and content of the observed universe, its creation, history and possible future, the development of the solar system.

The history of astronomy in the Philippines since it started in 1897 will be described.  The development of astronomical resources, activities and education after its hundred years of existence will be emphasized.

The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) is mandated by law, as the government agency which is tasked to keep and disseminate the Philippine Standard Time (PhST). Section 6 of Batas Pambansa Blg. 8, defining the metric system in the country, states that: "PAGASA shall be responsible in the establishment, maintenance and operation of the National Standard for the second of time".

Another law is Presidential Decree 1149, assigning PAGASA as the official agency that will handle the dissemination of the Philippine Standard Time (PST). Recently, the Philippine Standard Time Act was created.  Later, its Implementing Rules and Regulations was also created.

Philippine Standard Time widget

Steps in Time Synchronization Using PAGASA NTP Server

Philippine Standard Time Act of 2013 (Republic Act No.10535)
Implementing Rules and Regulations of Republic Act No.10535

Disclaimer: Internet is one of the main modes by which PAGASA disseminates the Philippine Standard Time (PhST). There may be discrepancies with the PhST displayed here as compared to the PAGASA clock; the major causes being the internet transmission delay and the computer workload of the computer you are using. For a more precise clock synchronization, please call (+632) 9291237.

Republic Act 10535
The Philippine Standard Time (PhST)

1.    What is Republic Act No. 10535?

It is "The Philippine Standard Time (PhST) Act of 2013". This law sets the PhST in all official sources throughout the country, provide funds for the installation, and maintenance of synchronized time devices to be displayed in key public places, and to declare the first week of every year as National Time Consciousness Week (NSTW)

The Philippine Standard Time has the acronym PhST to distinguish it from the Pacific Standard Time (PST).

2.    When was it passed into law and who signed it?

It was passed into law last May 15, 2013 and signed by President Benigno S. Aquino III.

3.    What does it aim to promote?

The spirit behind the Philippine Standard Time touches on both technical and cultural aspects. The technical aspects aims to sync all time devices in the country so that its 7, 107 islands will have common time. Meanwhile, the cultural aspect aims to modify the so-called "Filipino time" (later than the scheduled time) attitude and develop the habit of being punctual as a show of respect to other people and to the value of time.

4.    Where can the general public get the PhST?

The PhST is generally sourced from DOST-Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), the official time keeper of the country. Specifically, the PhST can be accessed from the PAGASA Astronomical Observatory, PAGASA Forecasting Center or the PAGASA ICT group;

Other institutions that can provide the PhST are the following:

- DOST agencies, and regional and provincial offices, including their wbsites;

- All PAGASA Regional and Field Stations;

- Internet, use of Network Time Protocol (NTP) Server System located in PAGASA website;

- Any of the National and Local government offices;

- Government and private television stations, and government and private radio stations;

- Other reliable means that provide accurate PhST.

5.    Who are required to display and comply with the PhST?

The following should display the PhST:

- National government agencies including State Universities and Colleges (SUCs) and Government Owned and Controlled Corporations (GOCCs);

- Local Government Units;

- Government television and rdio stations;

- Private television and radio stations;

- Private corporations/ agencies;

- Peoples's organizations, non-government organizations and civil society groups.

- Airports, seaports, expressways; and government electronic boards and similar establishments.

At least once a month, all of these offices, through their information and communication technology units or the equivalent, shall coordinate with PAGASA's Time Service Unit to synchronize their official timepieaces and devices.

6.    Who is tasked to monitor, maintain and disseminate the PhST?

PAGASA's Time Service Unit, in coordination with the Department of Science and Technology (DOST).

7.    What are the time devicces required to display PhST in acordance with the official time being provided by the PAGASA using its Network Time Protocol (NTP)?

Official time devices, including but limited to:

- bundy clocks

- displayed clocks

- chronomeers

- quartz clocks

Procurement of these time devices is supervised by the DOST, and the required specifications are issued PAGASA.

8.    Where should the PhST displayed?

It should be prominently displayed in areas readily accesible to the general public.

9.    Do all time devices have to be exactly in sync with the PhST?

Time deviation of plus (+) or minus (-) five (5) seconds with the PhST is acceptable.

10.Private television and radio stations are required to display and broadcast the PhST. What if they fail to calibrate and sychronize their time devices?

Broadcast stations that fail to comply with the requirements of PhST will have the following penalty:

*First Offense - Fine of not less than thirty thousand (Php 30, 000.00) pesos but not more that fifty thousand (Php 50, 000.00) pesos.

*Second Offense - Revocation and cancellation of franchise to operate

The collected penalty will be deposited in the general fund of the National Treasury.

11.What if the government employee or officer responsible for the implementation of the PhST fails to calibrate and synchronize the devices with PhST?

The employee or officer shall be administratively liable without prejudice to any civil or criminal liability that maybe appropriately imposed.

12.How will the PhST be promoted to Filipinos?

To promote awareness on the Philippine Standard Time, the government institutionalized the "National Time Consciouseness Week" to be celebrated yearly every first week of January.

PAGASA and the Science and Technology Information Institute (STII) of the DOST, in collaboration with government agencies, shall organize activities for the observance of the National Time Consciouseness Week (NSTW). Government agencies through the CSC shall be encouraged to issue the necessary guidelines to all government offices to follow the PhST.

In the celebration week, the pubic is likewise required to participate and cooperate in the activities, and encouraged to practice and promote a culture of punctuality and wise time management.

For more details about synchronizing clocks with the PhST, please call the PAGASA Time Service Unit at (+632) 9291237



It has come to the attention of the Office of the Administrator of PAGASA that a certain person has been using the name of Dr. Vicente B. Malano to solicit money from the contractors of PAGASA.

Dr. Malano wishes to inform the public that he has not authorized anyone to solicit money on his behalf and to warn everyone against dealing with unscrupulous activities of certain individuals.

payong pagasa on android The latest version of the official PAGASA app can now be downloaded on Google play store

Weather Division is now  ISO 9001:2008 Certified
Proof has been furnished by means of an audit that the requirements of ISO 9001:2008 are met.

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