San Ramón Weather in September
What's the weather like in San Ramón (Alajuela) in September 2025?
The climate in San Ramón during September can be summarized as warm, humid and very wet.
September is in the fall / autumn in San Ramón and is typically the 6th coldest month of the year. Daytime maximum temperatures average around a muggy 26°C (79°F), whilst at night 19°C (66°F) is normal.
| Daytime temperature | 26.1°C 78.9°F |
|---|---|
| Nightly temperature | 18.8°C 65.8°F |
| Average temperature | 22.4°C 72.3°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 408 mm 16.1 ins |
| Rainy days | 24 days |
| Sea temperature | 28.8°C 83.8°F |
| Humidity | 86% |
| Windspeed | 10.1kph 6 mph |
On average September is the wettest month of the year in San Ramón with around 408mm 16.1 inches of rain making it a very wet time to visit. This rainfall is typically spread over 24 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 San Ramón
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 San Ramón in September 2025.
Other monthly averages
Best places to visit in September
San Ramón weather stats
| Hottest month: | April | 28°C 82.4°F |
|---|---|---|
| Driest month: | February | 2mm 0.1ins |
| Sunniest month: | February | 8.3hrs |
| Coldest month: | December | 25.7°C 78.3°F |
| Wettest month: | September | 408mm 16.1ins |
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