Sison Weather in September
What's the weather like in Sison (Ilocos) in September 2025?
The climate in Sison during September can be summarized as hot, humid and very wet.
September is in the fall / autumn in Sison and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a muggy 28°C (81°F), whilst at night 20°C (67°F) is normal.
| Daytime temperature | 27.5°C 81.4°F |
|---|---|
| Nightly temperature | 19.6°C 67.2°F |
| Average temperature | 23.5°C 74.3°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 433 mm 17 ins |
| Rainy days | 22 days |
| Sea temperature | 29.3°C 84.8°F |
| Humidity | 87% |
| Windspeed | 7.2kph 5 mph |
On average September is the 3rd wettest month of the year in Sison with around 433mm 17 inches of rain making it a very wet time to visit. This rainfall is typically spread over 22 days, although this may vary considerably.
On the flip side this corresponds to an average of 6 hours of sunshine per day.
September temperatures in Sison
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Sison in September 2025.
Other monthly averages
Best places to visit in September
Sison weather stats
| Hottest month: | May | 29.5°C 85.1°F |
|---|---|---|
| Driest month: | February | 7mm 0.3ins |
| Sunniest month: | April | 9.2hrs |
| Coldest month: | January | 26.5°C 79.7°F |
| Wettest month: | August | 617mm 24.3ins |
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