Warm
Average highs sit around 28°C, giving warm days by monthly-average standards.
September verdict
Cocos Island National Park, Costa Rica in September
Weather score56Good
Good for holiday weather
Average highs sit around 28°C, giving warm days by monthly-average standards. Sunshine averages 0h per day, so this is not one of the brighter months. Rainfall averages 243mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
28°C
Rain
243mm
Sun
0h
Sea
27°C
Weather score
56
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 243mm, so showers are a real planning factor.
Limited sun
Sunshine averages 0h per day, so this is not one of the brighter months.
Warm sea
Sea temperatures average 27°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Cocos Island National Park, Costa Rica with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September28°C average high
September is close to Cocos Island National Park's usual daytime heat, with little temperature swing across the year.
Warmest monthsAll year
Daytime heat stays consistently warm through the year.
Rain
September243mm average rain
September sits near Cocos Island National Park's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to March and October to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September0 hours average sun
September is close to Cocos Island National Park's usual sunshine level, with limited seasonal swing across the year.
Brightest monthsAll year
Sunshine stays consistently strong through the year.
Sea temperature
September27°C average sea
September is below Cocos Island National Park's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaFebruary to May
Sea temperatures are usually near 29°C in this stretch, so swimming comfort is at its strongest.
Weather score
September56 weather score
September scores below Cocos Island National Park's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJanuary to March and November to December
These months have the strongest weather score in the monthly averages.