Weather in September in San Jose

• The mean temperature in San Jose is really warm at 21.5 °C ( 70.7 °F).
• The shortest day is 12:01 long and the longest day is 12:18 long with an average length of 12:10.
• There are approximately 7:12 per day when bright sunshine is absent due to cloud, haze or the sun being too low on the horizon to register.
• The average daily temperature variation/ range in September is 11 °C (19.8 °F).
• In September the skies in San Jose are slightly fair having an average of a mediocre 4:50 of magnificent sunlight daily.
• It is sunny approximately 40.2% of daylight hours and cloudy 59.8% of daylight hours.
• Overnight temperatures are generally very mild with an average low of 16 °C (60.8 °F).
• The weather in September is reasonablytly soggy with rain time and again. A substantial 305mm (12in) of H2O precipitates during an average of 24 days.
• Afternoons can be hot with average high temperatures reaching 27 °C (80.6 °F).

Weather Trend Graph for September in San Jose, Costa-Rica

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