Warm
Average highs sit around 29°C, giving warm days by monthly-average standards.
September verdict
Tiwai Island, Sierra Leone in September
Weather score47Mixed
Mixed for holiday weather
Average highs sit around 29°C, giving warm days by monthly-average standards. Sunshine averages 3.6h per day, so this is not one of the brighter months. Rainfall averages 470mm, so showers are a real planning factor.
September weather
Monthly averages
Temp
29°C
Rain
470mm
Sun
3.6h
Sea
27°C
Weather score
47
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 470mm, so showers are a real planning factor.
Limited sun
Sunshine averages 3.6h 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 Tiwai Island, Sierra Leone with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September29°C average high
September is on the cooler side of Tiwai Island's year, useful if you prefer less intense daytime heat.
Warmest monthsFebruary to April
This stretch sets the upper range for average daytime heat.
Rain
September470mm average rain
September is one of Tiwai 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.
Sun
September3.6 hours average sun
September is below Tiwai Island's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsJanuary to April and November
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September27°C average sea
September is below Tiwai Island's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJanuary, April to June, and October to December
Sea temperatures are usually near 28°C in this stretch, so swimming comfort is at its strongest.
Weather score
September47 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 February and December
These months have the strongest weather score in the monthly averages.