Ostional Weather in September

In Ostional, September brings high daytime temperatures around 29°C (84°F), with nights cooling to 25°C (77°F). This month falls within the rainy season, so expect frequent rainfall.

Rainfall in Ostional in September

Ostional is in the rainy season in September, with rain on around 23 days and an average of 417 mm (16 in). The rain this month falls heavily when it arrives. Late afternoons in particular can see strong showers, so waterproofs are worth keeping handy.

Temperature in Ostional in September

In September, expect high temperatures in Ostional, with highs of 29°C (84°F) and lows of 25°C (77°F) at night. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights are warm at 25°C (77°F). It's worth making sure your accommodation has decent ventilation or air conditioning.

September in Ostional has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.

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For a detailed overview over the year and the best time to visit Costa Rica, check out our Ostional's climate page.

Ostional Temperature in September

Min Temperature 25°C (77°F)  

Max Temperature 29°C (84°F)  

Chance of Rain 77%  

Precipitation 417 mm (16 in)  

Rainy days 23 days  

What to Wear in Ostional in September

Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can.

What To Do in Ostional in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Costa Rica, check out our Ostional's climate page.

More climate data for Ostional

Temperature Rainfall

See the full Ostional climate overview or explore weather in Costa Rica.