Weather in Costa Rica for September 2025
In general, the average temperature in Costa Rica 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.
Costa Rica experiences an exceptionally high level of rainfall in September, with more than 24 rainy days on average.
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 in September average weather
| 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 Costa Rica
September weather day by day
| 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 | |
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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.
Costa Rica in September - FAQ
What to pack to Costa Rica in September?
As you prepare for your trip to Costa Rica 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 Costa Rica, 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 Costa Rica
UV exposure in Costa Rica during September
Quick links
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