Guam Weather in January
January in Guam sees daytime temperatures around 29°C (84°F) and lows of 26°C (79°F) at night. With around 84 mm (3.3 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Guam in January
You can typically expect 23 days of rain this month, averaging around 84 mm (3.3 in). Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.
Temperature in Guam in January
January is one of the better months to visit Guam. Expect 29°C (84°F) during the day and 26°C (79°F) at night. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With overnight lows of 26°C (79°F), nights stay very warm. Air conditioning makes a real difference if you're sensitive to heat. A cold shower before bed can also help you get to sleep more comfortably.
Sunshine in Guam in January
With about 177 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.If you're a fan of comfortable temperatures and drier conditions, January is a great time to visit.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Micronesia, check out our Guam's climate page.
Guam Temperature in January
Min Temperature
26°C (79°F)
Max Temperature
29°C (84°F)
Chance of Rain
75%
Precipitation
84 mm (3.3 in)
Rainy days
23 days
Sunshine
177 hours
Percentage Sunshine
Daily Historical Temperatures
51-year average (1976-2026)
Based on our historical records, temperatures in Guam typically stay consistent throughout January, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in January
Daily Historical Precipitation
51-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in January
Historical weather for Guam in January
Browse day-by-day weather records for Guam spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Guam historical weather extremes in January
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Guam.
- On January 9, 2018, temperatures climbed to 32°C (90°F), marking the warmest January day on record.
- On January 28, 1997, Guam saw its coldest January day with temperatures maxing out at 26°C (79°F).
- The coldest night in January in Guam was on January 18, 2000, with a minimum of 19°C (66°F).
Best Places in Micronesia in January
Find out more about the weather in Micronesia and which places have the best travel conditions in this month. See all of Micronesia in January →
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What to Wear in Guam in January
Warm but pleasant conditions in Guam in January. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Guam in January
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Micronesia, check out our Guam's climate page.
See the full Guam climate overview or explore weather in Micronesia.
