Olongapo Weather in September
Olongapo in September averages 30°C (86°F) during the day and 25°C (77°F) at night. September is part of the rainy season, so frequent rainfall is typical.
Rainfall in Olongapo in September
Olongapo is in the rainy season in September, with rain on around 21 days and an average of 439 mm (17 in). With high rainfall totals spread across the month, individual showers can be very heavy. Waterproof gear is strongly recommended.
Temperature in Olongapo in September
Daytime temperatures in Olongapo reach 30°C (86°F) in September, dropping to 25°C (77°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. At 25°C (77°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.September in Olongapo has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Philippines, check out our Olongapo's climate page.
Olongapo Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
30°C (86°F)
Chance of Rain
69%
Precipitation
439 mm (17 in)
Rainy days
21 days
Humidity
84% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Olongapo typically stay consistent throughout September, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Olongapo in September
Browse day-by-day weather records for Olongapo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Olongapo historical weather extremes in September
Based on 49 years of weather observations in Olongapo between 1976 and 2025, these are the recorded extremes.
- Olongapo recorded its highest September temperature of 36°C (97°F) on September 4, 1988.
- On September 4, 1994, Olongapo saw its coldest September day with temperatures maxing out at 25°C (77°F).
- The lowest overnight temperature recorded in September was 20°C (68°F) (September 30, 2023).
- The wettest day in September Olongapo was on September 3, 1985 with 284 mm (11 in) of precipitation.
Best Places in Philippines in September
Find out more about the weather in Philippines and which places have the best travel conditions in this month. See all of Philippines in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Olongapo in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can.What To Do in Olongapo in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Philippines, check out our Olongapo's climate page.
See the full Olongapo climate overview or explore weather in Philippines.
