San José
September
Weather in San José for September 2026
Your guide to San José weather in September - trends and predictions
In general, the average temperature in San José at the beginning of September is 24.7 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 24.6 °C by the end of September.
San José experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 628.8 mm.
Temperatures
Rain 🌧️
0
Dry days
30
Rainy days
0
Snow days
25°/13°
Temperatures
6 km/h
Avg max wind
90 %
Avg humidity
San José Weather September
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Temperatures trend during September in San José
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September weather in San José day by day
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| 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. | Light rain shower | 26° /13° | 13.3 mm | 6 | |
| 17 Sept. | Moderate or heavy rain shower | 24° /13° | 28.2 mm | 5 | |
| 18 Sept. | Moderate or heavy rain shower | 24° /13° | 17.9 mm | 6 | |
| 19 Sept. | Light rain shower | 25° /13° | 12.7 mm | 5 | |
| 20 Sept. | Light rain shower | 25° /12° | 28.4 mm | 5 | |
| 21 Sept. | Light rain shower | 24° /13° | 8.4 mm | 5 | |
| 22 Sept. | Light rain shower | 24° /12° | 34.7 mm | 5 | |
| 23 Sept. | Light rain shower | 25° /13° | 13.3 mm | 6 | |
| 24 Sept. | Light rain shower | 25° /12° | 6.6 mm | 6 | |
| 25 Sept. | Light rain shower | 24° /13° | 25.7 mm | 5 | |
| 26 Sept. | Moderate or heavy rain shower | 25° /12° | 21.4 mm | 6 | |
| 27 Sept. | Light rain shower | 24° /13° | 26.4 mm | 5 | |
| 28 Sept. | Light rain shower | 24° /13° | 12.5 mm | 5 | |
| 29 Sept. | Light rain shower | 25° /13° | 19.1 mm | 5 | |
| 30 Sept. | Light rain shower | 25° /13° | 13.4 mm | 6 | |
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Important Notice
Our weather forecast for San José 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 José forecast closer to your planned date for the most up-to-date weather information.
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San José in September - FAQ
What are the expected maximum and minimum temperatures in San José during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San José during September?
Significant rainfall exceeding 628.8 mm is expected in San José during September, occurring over more than 30 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in San José during September?
The average wind speed in San José during September is 6 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in San José
Explore the daily rainfall trends and prepare for San Josés September weather 💧
UV exposure in San José during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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