San Jose weather in September 2025

Expect 24°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in San Jose in September. Check more long-term weather averages for San Jose in September before you book your next holiday to Costa Rica in 2025/2026.

  • 24°C maximum daytime temperature in September in San Jose24
    24°C max day temperature
  • 6 hours of sunshine per day
  • 24 days with some rainfall in September in San Jose24
    24 days with some rainfall
  • 17°C minimum night-time temperature in September in San Jose17
    17°C min night temperature
  • 12 hours of daylight per day in September in San Jose12
    12 hours of daylight per day
  • Low heat & humidity in September in San JoseL
    Low heat & humidity
  • 372 mm monthly rainfall in September in San Jose372
    372 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in San Jose11
    11+ (Extreme) UV index

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The September weather guide for Costa Rica (San Jose) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in San Jose in September?

Daytime temperatures usually reach 24°C in San Jose in September, falling to 17°C at night.

How sunny is it in San Jose in September?

There are normally 6 hours of bright sunshine each day in San Jose in September - that's 49% of daylight hours.

Does it rain in San Jose in September?

There are usually 24 days with some rain in San Jose in September and the average monthly rainfall is 372mm.

San Jose September sunrise & sunset times

Browse the sunrise and sunset times for San Jose in September 2025. Select a month to view San Jose sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:27 17:45
Monday, 15th September 2025 05:26 17:37
Tuesday, 30th September 2025 05:25 17:27

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