Costa Rica in September
5.1out of 10
Not the best time
Hot: daytime highs around 33°C. Very wet: about 19 rainy days.
33°CAvg high
26°CAvg low
19Rainy days (175 mm)
12:08 hDaylight
07:00Sunrise · 19:08 Sunset
Why this score
- Hot: daytime highs around 33°C
- Very wet: about 19 rainy 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?
Rainfall in September is fairly consistent from year to year (2.9 days). 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 | 26°C | 14°C | 12 mm | 2 | – | – | 8.9 |
| February | 26°C | 15°C | 14 mm | 1 | – | – | 8.9 |
| March | 28°C | 16°C | 3 mm | 1 | – | – | 9.0 |
| April | 29°C | 18°C | 1 mm | 0 | – | – | 9.0 |
| May | 32°C | 21°C | 1 mm | 0 | – | – | 8.4 |
| June | 33°C | 25°C | 14 mm | 2 | – | – | 7.7 |
| July | 34°C | 26°C | 107 mm | 14 | – | – | 5.7 |
| August | 33°C | 26°C | 167 mm | 20 | – | – | 4.9 |
| September | 33°C | 26°C | 175 mm | 19 | – | – | 5.1 |
| October | 33°C | 24°C | 45 mm | 5 | – | – | 7.4 |
| November | 30°C | 19°C | 37 mm | 2 | – | – | 8.6 |
| December | 26°C | 15°C | 14 mm | 2 | – | – | 8.9 |
Frequently asked questions
How hot is Costa Rica in September?
Daytime highs average 33°C and nights about 26°C.
When is the best time to visit Costa Rica?
The best months are March, April, January, February.