Warm
Average highs sit around 31°C, giving warm days by monthly-average standards.
Weather Guide
Guam Average Monthly Weather
Weather score55Good annual avg
Best months: March, April, February
Across the year, average daytime temperatures are around 31°C, sunshine averages 5.6h per day, and rainfall totals about 2410mm. Sea temperatures average 29°C across the year.
Annual weather
Annual averages
Temp
31°C
Rain
2410mm
Annual total
Sun
5.6h
Sea
29°C
Weather score
55
Good avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Wet
Rainfall averages 273mm, so showers are a real planning factor.
Some sun
Sunshine averages 5.2h per day, enough for a balanced month.
Warm sea
Sea temperatures average 30°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Guam with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
July31°C average high
July is close to Guam's usual daytime heat, with little temperature swing across the year.
Warmest monthsAll year
Daytime heat stays consistently warm through the year.
Rain
July273mm average rain
July is wetter than Guam's yearly average, so flexible plans matter more.
Driest monthsJanuary to June and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
July5.2 hours average sun
July is below Guam's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsMarch to June
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
July30°C average sea
July is one of Guam's warmest sea months, when swimming comfort is usually strongest.
Warmest seaMay to December
Sea temperatures are usually near 29°C in this stretch, so swimming comfort is at its strongest.
Weather score
July49 weather score
July scores below Guam's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJanuary to June
These months have the strongest weather score in the monthly averages.
