Weather in Costa Rica for September 2025
Until now, September 2025 in Costa Rica is slightly cooler than the historical average by -1.2 °C.
Expect cooler weather in the next days in Costa Rica with the forecast suggesting a temperature of 23.7 °C, lower than the historical average.
In general, the average temperature in Costa Rica at the beginning of September is 24.7 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 24.1 °C by the end of September.
Costa Rica experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 628.8 mm.
Temperatures
Rain 🌧️
Costa Rica Weather September
What’s the Weather Like in Costa Rica This September?
Temperatures trend during September in Costa Rica
September weather in Costa Rica day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 25° /14° | 17.6 mm | 6 | |
| 2 Sept. |  Moderate or heavy rain shower | 24° /12° | 36 mm | 5 | |
| 3 Sept. | Light rain shower | 24° /13° | 15.9 mm | 5 | |
| 4 Sept. | Light rain shower | 25° /12° | 21.6 mm | 5 | |
| 5 Sept. | Light rain shower | 25° /12° | 27.3 mm | 6 | |
| 6 Sept. | Moderate or heavy rain shower | 25° /12° | 35.9 mm | 5 | |
| 7 Sept. |  Torrential rain shower | 25° /12° | 43.9 mm | 5 | |
| 8 Sept. | Moderate or heavy rain shower | 24° /13° | 18.6 mm | 5 | |
| 9 Sept. | Torrential rain shower | 24° /13° | 25.8 mm | 5 | |
| 10 Sept. | Light rain shower | 26° /13° | 10.7 mm | 6 | |
| 11 Sept. | Light rain shower | 25° /13° | 31.7 mm | 6 | |
| 12 Sept. |  Moderate rain | 25° /13° | 10 mm | 5 | |
| 13 Sept. | Moderate or heavy rain shower | 25° /13° | 19.2 mm | 6 | |
| 14 Sept. |  Mist | 25° /13° | 12.9 mm | 6 | |
| 15 Sept. | Light rain shower | 26° /12° | 5 mm | 6 | |
| 16 Sept. | Moderate rain | 23° /16° | 6 mm | 2.6 | |
| 17 Sept. | Heavy rain | 24° /15° | 57.5 mm | 1.8 | |
| 18 Sept. | Heavy rain | 23° /15° | 24.7 mm | 1.2 | |
| 19 Sept. | Patchy rain possible | 21° /15° | 3.8 mm | 0.6 | |
| 20 Sept. | Patchy rain possible | 25° /14° | 3.4 mm | 0 | |
| 21 Sept. | Moderate rain | 23° /15° | 6.2 mm | 4 | |
| 22 Sept. | Patchy rain possible | 23° /14° | 4.4 mm | 4 | |
| 23 Sept. | Patchy rain possible | 26° /15° | 3.2 mm | 4 | |
| 24 Sept. | Patchy rain possible | 24° /15° | 3.2 mm | 4 | |
| 25 Sept. | Patchy rain possible | 24° /15° | 3.8 mm | 4 | |
| 26 Sept. | Moderate rain | 24° /15° | 5.4 mm | 4 | |
| 27 Sept. | Patchy rain possible | 24° /15° | 3.9 mm | 4 | |
| 28 Sept. | Patchy rain possible | 24° /15° | 3.2 mm | 4 | |
| 29 Sept. | Moderate rain | 24° /14° | 19.3 mm | 4 | |
| 30 Sept. | Light rain shower | 25° /13° | 11.6 mm | 6 | |
| Next | |||||
Guide for Costa Rica in September
In September, Costa Rica experiences varying weather conditions at the beginning and end of the month. At the start of September, the weather in Costa Rica is characterized by the transition from the rainy season to the dry season.
The Pacific coast and central regions typically experience sunny days with occasional afternoon showers, while the Caribbean coast may still have some rainfall. Temperatures during this time can range from 24° to 32°.
By the end of September, the dry season begins to establish itself more firmly across the country. The Pacific coast and central regions generally enjoy sunny and dry weather, with temperatures ranging from 26° to 34°.
The Caribbean coast also experiences a decrease in rainfall, with temperatures ranging from 25° to 31°. Overall, September marks the gradual shift towards drier and more predictable weather patterns in Costa Rica.
Costa Rica's diverse microclimates mean that weather conditions can vary significantly from region to region, so it's important for travelers to consider the specific areas they plan to visit when preparing for their trip.
Costa Rica in September - FAQ
September rainfall patterns in Costa Rica
UV exposure in Costa Rica during September
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