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

In Tamarindo, September is the month with the lowest recorded average temperatures, measuring a high of 30°C (86°F) and a low of 23°C (73.4°F).

Rainfall

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

Sea temperature

In September, the average sea temperature in Tamarindo is 28°C (82.4°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

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

Sunshine

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

UV index

The months with the highest UV index are February through October, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an extreme threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum UV index of 12 in September translates into the following recommendations:
Carry out all crucial safety measures, unprotected skin may burn instantly. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Frequent application of a broad-spectrum SPF 30+ sunscreen is crucial, reapply it every two hours or immediately post swimming or outdoor exercise. Watch out! Sand and water enhance the UV exposure you receive.