Tamarindo, Costa Rica weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: December – March
What is the weather like in Tamarindo, Costa Rica in September?
In September, Tamarindo, Costa Rica is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 28.9 °C – lovely and warm for swimming. Expect around 4 hours of sunshine a day. It is the rainy season: rain falls on about 29 days, totalling 339 mm. The air is often humid and muggy. All in all, September is a good month for a holiday in Tamarindo, Costa Rica.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 66 | 65 | 64 |
| Day | 30° | 29° | 28° |
| Night | 25° | 25° | 25° |
| Sea | 29° | 29° | 28° |
| Sun | 5 h | 4 h | 4 h |
| Rain days | 26 | 29 | 28 |
More details for September
- Daylight
- 12 h 12 min05:33 – 17:45
- UV index
- 13 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 12 km/haverage daily peak
- Cloud cover
- 86 %on average
- Hot days
- 5 days30 °C or more
- Time zone
- UTC−6America/Costa_Rica
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %23 %
- Few rainy daysweight 20 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Tamarindo, Costa Rica in September: quick answers
Is Tamarindo, Costa Rica hot in September?
Yes. In September, Tamarindo, Costa Rica is hot: daytime highs average 29 °C and nights stay around 25 °C. On about 5 days the thermometer climbs to 30 °C or more.
Can you swim in Tamarindo, Costa Rica in September?
Yes. In September the sea averages 28.9 °C – lovely and warm for swimming.
Does it rain much in Tamarindo, Costa Rica in September?
It rains often – on about 29 days, adding up to 339 mm.
Tamarindo, Costa Rica month by month
The whole year in Tamarindo, Costa RicaAll destinations: Costa RicaWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)