Weather in Guam in January 2026
- January is usually the coldest month of the year in Guam;
Average weather
Average temperature in Guam in January
The expected average maximum temperature in January is +84°F with a maximum of +88°F and a minimum of +73°F.
The average maximum temperature goes up 25% by the end of the month, compared with the beginning of the month, from +84°F to +88°F.
Is Guam warm or cold in January?
Guam is typically warm in January.
Maximum temperatures go down compared to the previous month from +84°F to +82°F. The minimum temperature also goes down from +79°F to +77°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
January is the coldest month in Guam, here is the comparison with other months:
Climate in Guam in January
| December | January | February | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +84°F | +82°F | +82°F | ||||
| Min. temperature | ||||||
| +73°F | +72°F | +72°F | ||||
| Max. temperature | ||||||
| +90°F | +90°F | +88°F | ||||
| Rainfall | ||||||
| 151 mm | 121 mm | 91 mm | ||||
| Wind | ||||||
| 5 m/s | 5 m/s | 5 m/s | ||||
| Humidity | ||||||
| 81% | 79% | 78% | ||||
| Air pressure | ||||||
| 1009 HPa | 1010 HPa | 1011 HPa | ||||
| Sunny days | ||||||
| 1 | 2 | 2 | ||||
| Cloudy days | ||||||
| 2 | 4 | 5 | ||||
| Rainy days | ||||||
| 28 | 25 | 22 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
January weather is still as ok as in December. It’s getting colder in January. From +84°F in the day, the average maximum temperature lowers to +82°F. As January arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 151 mm to 121 mm. It feels drier, as humidity decreases from 81% to 79%. The average wind speed doesn’t change much during January, staying around 5 m/s. The good news is there are likely to be more sunny days in January, from 1 to 2.
February brings much the same weather, it remains ok.
Wind
The average wind speed is 5 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Guam is gradually decreasing during January, going from 6 m/s to 5 m/s over the course of the month.
Rain
How was the weather last January in Guam?
Climate Change Over the Years
The climate in Guam in January has not changed that much over the last 43 years.
The average temperature was the lowest in 1983 (+80°F) and the highest in 2018 (+88°F). The driest year was 1983 with only 1154 mm of rainfall, and the wettest year was 2023 with 4623 mm.
FAQ
Is January a good time to visit Guam?
Can you sunbathe in Guam in January?
Is Guam rainy in January?
Is it sunny in Guam in January?
Monthly weather in Guam
Source of the data
For this page, we’ve looked at the typical weather in Guam, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
