Casillas Weather in September
What's the weather like in Casillas (Santa Rosa) in September 2025?
The climate in Casillas during September can be summarized as warm, humid and very wet.
September is in the fall / autumn in Casillas and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a muggy 25°C (78°F), whilst at night 16°C (61°F) is normal.
| Daytime temperature | 25.3°C 77.5°F |
|---|---|
| Nightly temperature | 16.4°C 61.4°F |
| Average temperature | 20.8°C 69.4°F |
| Daily sunshine | 5.3 hrs |
| Avg rainfall | 235 mm 9.2 ins |
| Rainy days | 27 days |
| Sea temperature | 29.5°C 85.1°F |
| Humidity | 88% |
| Windspeed | 7.6kph 5 mph |
On average September is the 2nd wettest month of the year in Casillas with around 235mm 9.2 inches of rain making it a very wet time to visit. This rainfall is typically spread over 27 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.3 hours of sunshine per day.
September temperatures in Casillas
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 Casillas in September 2025.
Other monthly averages
Best places to visit in September
Casillas weather stats
| Hottest month: | May | 26.9°C 80.4°F |
|---|---|---|
| Driest month: | February | 2mm 0.1ins |
| Sunniest month: | January | 7.9hrs |
| Coldest month: | January | 23.9°C 75°F |
| Wettest month: | June | 244mm 9.6ins |
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