Warm
Average highs sit around 30°C, giving warm days by monthly-average standards.
January verdict
Tumon, Guam in January
Weather score60Good
Good for holiday weather
Average highs sit around 30°C, giving warm days by monthly-average standards. Sunshine averages 5.6h per day, enough for a balanced month. Rainfall averages 130mm, so some wet days are possible.
January weather
Monthly averages
Temp
30°C
Rain
130mm
Sun
5.6h
Sea
28°C
Weather score
60
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 130mm, so some wet days are possible.
Some sun
Sunshine averages 5.6h per day, enough for a balanced month.
Warm sea
Sea temperatures average 28°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
January30°C average high
January 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
January130mm average rain
January 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
January5.6 hours average sun
January sits close to Tumon's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMarch to June
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
January28°C average sea
January is below Tumon's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaMay to December
Sea temperatures are usually near 29°C in this stretch, so swimming comfort is at its strongest.
Weather score
January60 weather score
January scores above Tumon's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJanuary to June
These months have the strongest weather score in the monthly averages.
