San José
September
Weather in San José for September 2025
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 25 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 24.4 °C by the end of September.
San José experiences an exceptionally high level of rainfall in September, with more than 24 rainy days on average.
Is September a good time to visit San José? check out the best time to travel to San José page.
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2
Dry days
28
Rainy days
0
Snow days
26°/13°
Temperatures
6 km/h
Avg max wind
88 %
Avg humidity
San José in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  25° | 2 24° | 3  25° | 4 25° | 5 26° | 6 25° | 7 25° |
| 8 24° | 9 24° | 10 26° | 11 25° | 12  25° | 13 27° | 14  26° |
| 15 27° | 16  26° | 17 25° | 18 25° | 19 25° | 20 24° | 21 23° |
| 22 23° | 23 25° | 24 24° | 25 23° | 26 26° | 27 24° | 28 24° |
| 29 25° | 30 25° |
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Temperatures trend during September in San José
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Torrential rain shower | 25° /15° | 24.3 mm | 6 | |
| 2 Sept. | Torrential rain shower | 24° /13° | 35 mm | 6 | |
| 3 Sept. | Moderate or heavy rain shower | 25° /13° | 14.1 mm | 6 | |
| 4 Sept. | Torrential rain shower | 25° /13° | 24.8 mm | 6 | |
| 5 Sept. | Torrential rain shower | 26° /13° | 33.6 mm | 6 | |
| 6 Sept. | Moderate or heavy rain shower | 25° /13° | 35.8 mm | 6 | |
| 7 Sept. | Torrential rain shower | 25° /12° | 50.3 mm | 6 | |
| 8 Sept. | Moderate or heavy rain shower | 24° /13° | 14.2 mm | 6 | |
| 9 Sept. | Torrential rain shower | 24° /13° | 17.8 mm | 6 | |
| 10 Sept. | Moderate or heavy rain shower | 26° /12° | 13 mm | 6 | |
| 11 Sept. | Moderate or heavy rain shower | 25° /13° | 41.1 mm | 6 | |
| 12 Sept. | Moderate rain | 25° /14° | 7.7 mm | 6 | |
| 13 Sept. | Moderate or heavy rain shower | 27° /13° | 7.2 mm | 6 | |
| 14 Sept. | Mist | 26° /12° | 9.8 mm | 6 | |
| 15 Sept. | Mist | 27° /12° | 2.6 mm | 6 | |
| 16 Sept. | Light rain shower | 26° /13° | 8.5 mm | 6 | |
| 17 Sept. | Light rain shower | 25° /13° | 14.7 mm | 6 | |
| 18 Sept. | Light rain shower | 25° /13° | 19.6 mm | 6 | |
| 19 Sept. | Light rain shower | 25° /13° | 14.6 mm | 6 | |
| 20 Sept. | Torrential rain shower | 24° /13° | 37.4 mm | 5 | |
| 21 Sept. | Light rain shower | 23° /13° | 9.4 mm | 5 | |
| 22 Sept. | Light rain shower | 23° /12° | 47.7 mm | 5 | |
| 23 Sept. | Light rain shower | 25° /13° | 11.3 mm | 6 | |
| 24 Sept. | Light rain shower | 24° /13° | 6.1 mm | 6 | |
| 25 Sept. | Light rain shower | 23° /13° | 22.8 mm | 5 | |
| 26 Sept. | Moderate or heavy rain shower | 26° /12° | 27 mm | 6 | |
| 27 Sept. | Torrential rain shower | 24° /13° | 35.1 mm | 5 | |
| 28 Sept. | Light rain shower | 24° /13° | 11.6 mm | 5 | |
| 29 Sept. | Light rain shower | 25° /14° | 20.2 mm | 6 | |
| 30 Sept. | Light rain shower | 25° /13° | 11.6 mm | 6 | |
| Next | |||||
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.
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 26° 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 545.6 mm is expected in San José 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 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.
What to pack to San José in September?
As you prepare for your trip to San José in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in San José, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
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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