Climate averages 1991–2020
Olongapo weather
in September.
A hot, very wet month: the joint 9th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Olongapo: daytime highs average 28.9°C and nights cool to about 25.0°C. By daytime temperature it is the joint 9th warmest of the 12 months.
Expect about 436 mm of rain on roughly 28 days, which makes September a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 14 min on an average September day.
The nearest other city in this atlas is Balanga (32 km away). In September its highs average 28.9°C, about as warm as Olongapo, with 355 mm of rain.
Among the 151 cities listed in the Philippines, Olongapo ranks joint 100th of 151 for the warmest September highs and 147th of 151 for the driest September (rainfall, lowest first). The mean September high of those 151 cities is 29.0°C; Olongapo is 0.1°C cooler than that mean.
From September to October, average highs rise by 0.7°C to 29.5°C, and monthly rainfall falls from 436 mm to 225 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Olongapo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.8°C23.0°C | 23.0°C | 18 | 2.6 | 11.411 h |
| February | 29.7°C23.0°C | 23.0°C | 19 | 2.8 | 11.612 h |
| March | 31.1°C23.9°C | 23.9°C | 23 | 3.8 | 12.012 h |
| April | 32.4°C25.3°C | 25.3°C | 27 | 5.5 | 12.512 h |
| May | 31.6°C26.0°C | 26.0°C | 185 | 18.9 | 12.813 h |
| June | 30.0°C25.6°C | 25.6°C | 361 | 25.7 | 13.013 h |
| July | 29.0°C25.2°C | 25.2°C | 571 | 29.5 | 12.913 h |
| August | 28.6°C25.1°C | 25.1°C | 565 | 29.4 | 12.613 h |
| September, selected | 28.9°C25.0°C | 25.0°C | 436 | 27.7 | 12.212 h |
| October | 29.5°C24.8°C | 24.8°C | 225 | 20.3 | 11.812 h |
| November | 29.6°C24.7°C | 24.7°C | 86 | 9.3 | 11.511 h |
| December | 28.9°C24.0°C | 24.0°C | 67 | 6.6 | 11.311 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Balanga in SeptemberPhilippines · 32 kmHigh 28.9°C · Low 25.7°C · 355 mm rain
- Limay in SeptemberPhilippines · 45 kmHigh 28.3°C · Low 25.5°C · 413 mm rain
- Angeles City in SeptemberPhilippines · 48 kmHigh 29.3°C · Low 23.7°C · 290 mm rain
- San Fernando in SeptemberPhilippines · 49 kmHigh 29.3°C · Low 24.3°C · 279 mm rain
- Mariveles in SeptemberPhilippines · 49 kmHigh 28.5°C · Low 26.1°C · 413 mm rain
- Bulaon in SeptemberPhilippines · 50 kmHigh 29.3°C · Low 24.0°C · 279 mm rain
- Apalit in SeptemberPhilippines · 54 kmHigh 29.0°C · Low 24.0°C · 279 mm rain
- Malolos in SeptemberPhilippines · 57 kmHigh 28.9°C · Low 24.5°C · 309 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Olongapo) is explained once on the Olongapo year overview and on the Sources, method and limits page.