Chira Island, Costa Rica in September

September31°C average high

September is cooler than the yearly average, which can make sightseeing feel gentler than in hotter months.

Warmest monthsJanuary to May

This stretch sets the upper range for average daytime heat.

September343mm average rain

September is one of Chira Island's wettest months, so rain is likely to be a major planning factor.

Driest monthsJanuary to April and November to December

This is the drier part of the year, when outdoor plans usually need less weather flexibility.

September5.1 hours average sun

September is one of Chira Island's cloudier months, so sunshine-led plans are less reliable.

Brightest monthsJanuary to April

This stretch has the strongest sunshine in the monthly averages.

September29°C average sea

September is part of a consistently warm sea-temperature pattern, so swimming comfort changes little through the year.

Warmest seaAll year

Sea temperatures stay warm enough for easy swimming through the year.

September48 weather score

September is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.

Best weather monthsJanuary to April and December

These months have the strongest weather score in the monthly averages.