Warm
Average highs sit around 30°C, giving warm days by monthly-average standards.
December verdict
Tumon, Guam in December
Weather score56Good
Good for holiday weather
Average highs sit around 30°C, giving warm days by monthly-average standards. Sunshine averages 4.6h per day, so this is not one of the brighter months. Rainfall averages 150mm, so some wet days are possible.
December weather
Monthly averages
Temp
30°C
Rain
150mm
Sun
4.6h
Sea
29°C
Weather score
56
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 150mm, so some wet days are possible.
Limited sun
Sunshine averages 4.6h per day, so this is not one of the brighter months.
Warm sea
Sea temperatures average 29°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Tumon, Guam with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
December30°C average high
December is close to Tumon's usual daytime heat, with little temperature swing across the year.
Warmest monthsAll year
Daytime heat stays consistently warm through the year.
Rain
December150mm average rain
December sits on the drier side of Tumon's year, which helps with sightseeing and transfers.
Driest monthsJanuary to June and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
December4.6 hours average sun
December is one of Tumon's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsMarch to June
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
December29°C average sea
December is close to Tumon's yearly sea-temperature average, so swimming comfort is fairly typical.
Warmest seaMay to December
Sea temperatures are usually near 29°C in this stretch, so swimming comfort is at its strongest.
Weather score
December56 weather score
December sits close to Tumon's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJanuary to June
These months have the strongest weather score in the monthly averages.
