Costa Rica in September
7.2out of 10
Possible, with caveats
Hot: daytime highs around 32°C. Frequent rain: about 9 rainy days.
32°CAvg high
20°CAvg low
9Rainy days (67 mm)
11:54 hDaylight
05:30Sunrise · 17:24 Sunset
Why this score
- Hot: daytime highs around 32°C
- Frequent rain: about 9 rainy days
- Rain varies a lot between years (±5.8 days)
What to wear and pack
- Light, breathable clothing
- Shorts or a light skirt
- Rain jacket or compact umbrella
- Sunscreen, sunglasses and a hat
How reliable is the forecast?
Rain in September varies a lot between years (±5.8 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 29°C | 21°C | 256 mm | 26 | – | – | 6.1 |
| February | 29°C | 21°C | 217 mm | 24 | – | – | 6.0 |
| March | 30°C | 21°C | 182 mm | 24 | – | – | 5.9 |
| April | 30°C | 20°C | 82 mm | 13 | – | – | 7.2 |
| May | 28°C | 18°C | 39 mm | 6 | – | – | 8.3 |
| June | 28°C | 17°C | 18 mm | 2 | – | – | 8.8 |
| July | 28°C | 16°C | 11 mm | 1 | – | – | 8.9 |
| August | 31°C | 18°C | 17 mm | 3 | – | – | 8.3 |
| September | 32°C | 20°C | 67 mm | 9 | – | – | 7.2 |
| October | 31°C | 21°C | 128 mm | 18 | – | – | 5.8 |
| November | 30°C | 20°C | 175 mm | 22 | – | – | 5.9 |
| December | 29°C | 21°C | 217 mm | 26 | – | – | 6.0 |
Frequently asked questions
How hot is Costa Rica in September?
Daytime highs average 32°C and nights about 20°C.
When is the best time to visit Costa Rica?
The best months are July, June, May, August.