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Costa Rica weather in September 2025
Expect 24°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Costa Rica in September. Check more long-term weather averages for Costa Rica in September before you book your next holiday to Costa Rica in 2025/2026.
- 24°C max day temperature
24 - 6 hours of sunshine per day
- 24 days with some rainfall
24 - 17°C min night temperature
17 - 12 hours of daylight per day
12 - Low heat & humidity
L - 372 mm of monthly rainfall
372 - 11+ (Extreme) UV index
11
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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.
Top Costa Rica destinations
Below are average maximum temperatures at popular countries, regions and places in Costa Rica in September. Select a holiday destination to see more weather parameters.
All Costa Rica destinations
- Dominical
- Golfito
- Jaco
- La Fortuna
- Liberia
- Monteverde
- Punta Leone
- Quepos
- Samara
- San Jose
- Tamarindo
- Tambor
- Tortuquero
Metric (°C / mm) | Imperial (°F / inches)
More about Costa Rica
How hot is it in Costa Rica in September?
Daytime temperatures usually reach 24°C in San Jose, Costa Rica in September, falling to 17°C at night.
How sunny is it in Costa Rica in September?
There are normally 6 hours of bright sunshine each day in San Jose, Costa Rica in September - that's 49% of daylight hours.
Does it rain in Costa Rica in September?
There are usually 24 days with some rain in San Jose, Costa Rica in September and the average monthly rainfall is 372mm.
Costa Rica September sunrise & sunset times
Browse the sunrise and sunset times for Costa Rica in September 2025. Select a month to view Costa Rica sunrise and sunset times for the next 12 months. The Costa Rica sunrise and sunset times shown below are for San Jose.
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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