Mild
Average highs are around 22°C, so days are mild rather than hot.
Weather Guide
Saint Helena, Ascension and Tristan da Cunha Average Monthly Weather
Weather score79Very good annual avg
Best months: February, March, January
Across the year, average daytime temperatures are around 24°C, sunshine averages 0h per day, and rainfall totals about 58mm. Sea temperatures average 22°C across the year.
Annual weather
Annual averages
Temp
24°C
Rain
58mm
Annual total
Sun
0h
Sea
22°C
Weather score
79
Very good avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 5mm, which is relatively low for holiday planning.
Limited sun
Sunshine averages 0h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 21°C, so the water can feel cool.
Map
Weather map
Compare Saint Helena, Ascension and Tristan da Cunha with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August22°C average high
August is on the cooler side of Saint Helena's year, useful if you prefer less intense daytime heat.
Warmest monthsJanuary to April
This stretch sets the upper range for average daytime heat.
Rain
August5mm average rain
August is close to Saint Helena's usual rainfall pattern, with little seasonal change across the year.
Driest monthsAll year
Rainfall stays comparatively low through the year.
Sun
August0 hours average sun
August is close to Saint Helena's usual sunshine level, with limited seasonal swing across the year.
Brightest monthsAll year
Sunshine stays consistently strong through the year.
Sea temperature
August21°C average sea
August is one of the coolest sea months, so the water may feel fresher than in peak months.
Warmest seaFebruary to May
Sea temperatures are usually near 25°C in this stretch, so swimming comfort is at its strongest.
Weather score
August68 weather score
August 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
These months have the strongest weather score in the monthly averages.