San Carlos (La Fortuna)
September
Weather in San Carlos for September 2025
Your guide to San Carlos weather in September - trends and predictions
Until now, September 2025 in San Carlos is slightly cooler than the historical average by -1.7 °C.
The forecast for the next days in San Carlos predicts temperatures to be around 29 °C, close to the historical average.
In general, the average temperature in San Carlos at the beginning of September is 28.4 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 29.3 °C by the end of September.
San Carlos experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 312.3 mm.
Temperatures
Rain 🌧️
2
Dry days
28
Rainy days
0
Snow days
30°/22°
Temperatures
5 km/h
Avg max wind
89 %
Avg humidity
San Carlos Weather September
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Temperatures trend during September in San Carlos
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September weather in San Carlos day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Fog | 28° /20° | 4.9 mm | 6 | |
| 2 Sept. | Fog | 28° /20° | 12.8 mm | 7 | |
| 3 Sept. |  Light rain shower | 29° /21° | 14.3 mm | 7 | |
| 4 Sept. | Light rain shower | 29° /20° | 8.2 mm | 7 | |
| 5 Sept. | Light rain shower | 29° /21° | 6.8 mm | 7 | |
| 6 Sept. |  Moderate or heavy rain shower | 27° /20° | 20.9 mm | 6 | |
| 7 Sept. | Moderate or heavy rain shower | 29° /20° | 22.1 mm | 7 | |
| 8 Sept. | Light rain shower | 28° /19° | 8 mm | 6 | |
| 9 Sept. | Light rain shower | 29° /21° | 9.3 mm | 6 | |
| 10 Sept. |  Patchy light rain with thunder | 31° /22° | 7.9 mm | 7 | |
| 11 Sept. | Light rain shower | 30° /22° | 12.9 mm | 7 | |
| 12 Sept. | Light rain shower | 30° /22° | 10.7 mm | 7 | |
| 13 Sept. | Patchy light rain with thunder | 29° /22° | 25.9 mm | 7 | |
| 14 Sept. | Light rain shower | 31° /21° | 12.8 mm | 7 | |
| 15 Sept. | Patchy light rain with thunder | 29° /22° | 10.6 mm | 7 | |
| 16 Sept. | Patchy rain possible | 30° /22° | 3.7 mm | 2.5 | |
| 17 Sept. |  Moderate rain | 28° /22° | 7.4 mm | 1.6 | |
| 18 Sept. | Moderate rain | 25° /21° | 7.4 mm | 2.6 | |
| 19 Sept. | Patchy rain possible | 30° /21° | 1.3 mm | 0.7 | |
| 20 Sept. | Moderate rain | 30° /23° | 9.5 mm | 0 | |
| 21 Sept. | Moderate rain | 29° /25° | 7.8 mm | 6 | |
| 22 Sept. | Patchy rain possible | 31° /24° | 0.5 mm | 6 | |
| 23 Sept. | Patchy rain possible | 26° /21° | 2.7 mm | 5 | |
| 24 Sept. | Patchy rain possible | 27° /22° | 2.4 mm | 5 | |
| 25 Sept. | Patchy rain possible | 28° /21° | 2.2 mm | 5 | |
| 26 Sept. | Patchy rain possible | 27° /21° | 0.4 mm | 5 | |
| 27 Sept. | Patchy rain possible | 32° /20° | 0.2 mm | 6 | |
| 28 Sept. | Patchy rain possible | 31° /24° | 3.2 mm | 6 | |
| 29 Sept. | Patchy rain possible | 30° /26° | 3.6 mm | 6 | |
| 30 Sept. | Light rain shower | 30° /22° | 18.1 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for San Carlos in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the San Carlos forecast closer to your planned date for the most up-to-date weather information.
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San Carlos in September - FAQ
What are the expected maximum and minimum temperatures in San Carlos during September?
During September, expect a variety of temperatures with highs around 30° and lows near 22°, suitable for diverse activities and preferences.
How much rainfall should be expected in San Carlos during September?
Significant rainfall exceeding 312.3 mm is expected in San Carlos during September, occurring over more than 28 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in San Carlos during September?
The average wind speed in San Carlos during September is 5 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in San Carlos
Explore the daily rainfall trends and prepare for San Carloss September weather 💧
UV exposure in San Carlos during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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