Warm
Average highs sit around 32°C, giving warm days by monthly-average standards.
Weather Guide
French Guiana Average Monthly Weather
Weather score57Good annual avg
Best months: September, October, August
Across the year, average daytime temperatures are around 31°C, sunshine averages 6h per day, and rainfall totals about 2792mm. Sea temperatures average 18°C across the year.
Annual weather
Annual averages
Temp
31°C
Rain
2792mm
Annual total
Sun
6h
Sea
18°C
Weather score
57
Good avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 108mm, so some wet days are possible.
Some sun
Sunshine averages 7.7h per day, enough for a balanced month.
Cool sea
Sea temperatures average 19°C, so the water can feel cool.
Map
Weather map
Compare French Guiana with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August32°C average high
August sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsAugust to November
This stretch sets the upper range for average daytime heat.
Rain
August108mm average rain
August sits on the drier side of French Guiana's year, which helps with sightseeing and transfers.
Driest monthsAugust to November
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August7.7 hours average sun
August is brighter than French Guiana's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsAugust to November
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August19°C average sea
August is close to French Guiana's usual sea temperature, with limited seasonal change in the water.
Warmest seaAll year
Sea temperatures stay warm enough for easy swimming through the year.
Weather score
August70 weather score
August scores above French Guiana's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsAugust to October
These months have the strongest weather score in the monthly averages.