September weather forecast
Tamarindo, Costa Rica

Expect significant rainfall in September with an uptick in showers to an annual high of 356mm (14.02"). A continuity from August, September's climatic temperament resonates with that of a typical rainforest region. Holding a warmer sea temperature sustains the charm of beach picnics and aquatic activities. Despite the torrential rain, daylight hours and sunshine fare well, ensuring the warmth. September is a month to discover the vibrant flora and fauna, blossoming extensively under the stimulating showers.

Temperature

September is the coldest month in Tamarindo, with the temperature often reaching an average high of 30°C (86°F) and an average low of 23°C (73.4°F).

Rainfall

In Tamarindo, in September, during 23 rainfall days, 356mm (14.02") of precipitation is typically accumulated. In Tamarindo, Costa Rica, during the entire year, the rain falls for 171 days and collects up to 1853mm (72.95") of precipitation.

Sea temperature

In Tamarindo, in September, the average water temperature is 28°C (82.4°F).
Note: Water temperature ranging between 25°C (77°F) and 29°C (84.2°F) is considered very warm and pleasing for everyone. It allows for enjoyable water activities over extended periods without discomfort.

Daylight

In Tamarindo, the average length of the day in September is 12h and 11min.
On the first day of the month, sunrise is at 05:33 and sunset at 17:52. On the last day of September, in Tamarindo, Costa Rica, sunrise is at 05:31 and sunset at 17:34 CST.

Sunshine

The months with the least sunshine in Tamarindo are June, August through October, with an average of 5h of sunshine.

UV index

The months with the highest UV index in Tamarindo, Costa Rica, are February through October, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an extreme threat to health from exposure to the Sun's UV rays for the average person.
Note: In September, the maximum UV index of 12 transforms into these recommendations:
Utilize every vital safety procedure. Individuals with light skin may endure burns in less than 5 minutes. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. To cut down UV radiation exposure by about half, sport a wide-brim hat. Even on overcast days, ensure the application and frequent reapplication of sunscreen with at least an SPF 30, especially post swim or outdoor exercise. Take caution! The UV rays from the Sun gain strength from sand and water reflections.