Weather in Alajuela: September
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Average day temperature: | 77.0°F |
| Average night temperature: | 63.5°F | |
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Sea water temperature: | 83.7°F |
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Number of sunny days: | 1 day |
| Day length: | 12.0 - 12.3 hours | |
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Number of rainy days: | 25 days |
| Precipitation totals: | 21.9 in. | |
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forecast
| Alajuela |
temperature
| Alajuela |
Air temperature in September, °F
The highest day temperature during September of 2025 was 81°F. At the same time the lowest night temperature was 59°F. Daily and nightly averages during September were 74.9°F and 60.7°F.
Sea water temperature in Alajuela in September, °F
The average sea water temperature in September of 2025 was 83.7°F. The highest and lowest sea temperatures during the month were 84.2°F and 83.1°F.
Mostly all days in September are cloudy but sunny and partly cloudy days are also possible.
Precipitation total in September, in.
Precipitation total value in Alajuela in September is 19.9 in. It makes september one of the most rainy months of the year.
The average wind speed value in September is 2.2 mph It makes September lest windy month of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 4.2.
Best time for vacation in Alajuela
Alajuela on a weather map
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