Warm
Average highs sit around 29°C, giving warm days by monthly-average standards.
September verdict
Sierpe, Costa Rica in September
Weather score53Mixed
Mixed for holiday weather
Average highs sit around 29°C, giving warm days by monthly-average standards. Sunshine averages 5.3h per day, enough for a balanced month. Rainfall averages 456mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
29°C
Rain
456mm
Sun
5.3h
Sea
29°C
Weather score
53
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 456mm, so showers are a real planning factor.
Some sun
Sunshine averages 5.3h per day, enough for a balanced month.
Warm sea
Sea temperatures average 29°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Sierpe, Costa Rica with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September29°C average high
September is on the cooler side of Sierpe's year, useful if you prefer less intense daytime heat.
Warmest monthsFebruary to May and July
This stretch sets the upper range for average daytime heat.
Rain
September456mm average rain
September is wetter than Sierpe's yearly average, so flexible plans matter more.
Driest monthsJanuary to April and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September5.3 hours average sun
September is one of Sierpe's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsJanuary to April
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September29°C average sea
September is close to Sierpe's yearly sea-temperature average, so swimming comfort is fairly typical.
Warmest seaJanuary to September
Sea temperatures are usually near 29°C in this stretch, so swimming comfort is at its strongest.
Weather score
September53 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 March
These months have the strongest weather score in the monthly averages.
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