Weather in Costa Rica for September 2027
In general, the average temperature in Costa Rica at the beginning of September is 24 °C. As the month progressed, temperatures tended to slightly increase, 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 549.4 mm.
Is September a good time to visit Costa Rica? check out the best time to travel to Costa Rica page.
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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. |  Moderate rain | 25° /14° | 14.6 mm | 5 | |
| 2 Sept. |  Heavy rain | 24° /13° | 28.4 mm | 5 | |
| 3 Sept. | Moderate rain | 24° /14° | 12.5 mm | 5 | |
| 4 Sept. | Moderate rain | 24° /13° | 17.2 mm | 6 | |
| 5 Sept. | Moderate rain | 24° /13° | 21.9 mm | 5 | |
| 6 Sept. | Heavy rain | 24° /13° | 29.6 mm | 5 | |
| 7 Sept. | Torrential rain shower | 24° /13° | 34.5 mm | 5 | |
| 8 Sept. | Moderate rain | 23° /14° | 14.5 mm | 5 | |
| 9 Sept. | Moderate rain | 24° /15° | 21.1 mm | 5 | |
| 10 Sept. | Moderate rain | 25° /14° | 10.3 mm | 5 | |
| 11 Sept. | Moderate rain | 25° /14° | 24.6 mm | 5 | |
| 12 Sept. |  Moderate or heavy rain shower | 25° /14° | 9.8 mm | 6 | |
| 13 Sept. | Moderate rain | 24° /14° | 17.9 mm | 5 | |
| 14 Sept. | Moderate rain | 25° /14° | 14.8 mm | 5 | |
| 15 Sept. |  Light rain | 25° /14° | 8 mm | 5 | |
| 16 Sept. | Moderate rain | 25° /14° | 11.9 mm | 5 | |
| 17 Sept. | Moderate rain | 24° /14° | 22.7 mm | 5 | |
| 18 Sept. | Moderate rain | 24° /14° | 16.3 mm | 6 | |
| 19 Sept. | Moderate rain | 25° /14° | 17.5 mm | 5 | |
| 20 Sept. | Moderate rain | 24° /14° | 24.3 mm | 5 | |
| 21 Sept. | Light rain | 23° /14° | 9.8 mm | 5 | |
| 22 Sept. | Heavy rain | 24° /13° | 27.8 mm | 5 | |
| 23 Sept. | Moderate rain | 25° /14° | 13.5 mm | 6 | |
| 24 Sept. | Light rain | 25° /13° | 9.7 mm | 5 | |
| 25 Sept. | Heavy rain | 24° /14° | 26.9 mm | 4 | |
| 26 Sept. | Moderate rain | 24° /14° | 20.5 mm | 5 | |
| 27 Sept. | Moderate rain | 24° /14° | 24.9 mm | 4 | |
| 28 Sept. | Moderate rain | 24° /14° | 12 mm | 4 | |
| 29 Sept. | Moderate rain | 24° /14° | 17.8 mm | 5 | |
| 30 Sept. | Moderate rain | 25° /14° | 14.2 mm | 5 | |
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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.