Travel Weather Fairy🎊 Featured event
CHamoru Month
📅 March
A month celebrating Guam’s CHamoru culture and traditions, with a good chance to experience local cultural events.
Check official source →🇬🇺 Guam, U.S.
Guam Weather in December
Transition seasonIn Guam, December averages about 30°C (85°F) during the day and 25°C (78°F) at night, so afternoons generally feel hot while evenings are warm. Rain is fairly common, with about 19 days reaching at least 1 mm of precipitation and roughly 127 mm for the month.
Avg high85.3°F 29.6°CAvg low77.7°F 25.4°CRainy days~19.3 daysMonthly rain127.3 mm
🧳 Packing guide
What to wear in Guam in December
A practical December packing list for Guam starts here: light, breathable clothes work best, with sun protection for long outdoor days. Add a compact umbrella or light rain jacket because wet weather is common enough to affect sightseeing.
Travel takeaway: The month can work well for a trip if you are comfortable building indoor alternatives around wetter periods.
🗓️ Travel timing at a glance
Guam: 12-month travel weather
Guam is generally drier from January to May and wetter from July to November. Tropical storms and typhoons are an important late-summer and autumn consideration.
JanDry seasonFebDry seasonMarDry seasonAprDry seasonMayDry seasonJunTransition seasonJulWet seasonAugWet season · Typhoon riskSepWet season · Typhoon riskOctWet season · Typhoon riskNovWet season · Typhoon riskDecTransition season
Monthly labels summarize typical climate patterns for trip planning. Always check the latest forecast and tropical-storm alerts before departure.
🎉 Trip planning check
Guam 2026 events & busy periods
Check major events, holidays and periods that may affect crowds, transport or opening hours.
⚠️ Busy / closure period
Liberation Day events
📅 Around Jul 21
Crowds and traffic controls can affect Hagåtña and parade routes, so allow extra time when driving.
Check official source →Event dates, holiday schedules and opening hours can change. Recheck the linked official tourism or government source before departure.
Guam in December · recent 3 years
Compare the most recent complete year with the two years before it. Daily high / low temperatures are shown in °F.
CalendarNo measurable rain🌧️ Rain⛈️ Thunderstorm❄️ SnowHigh / Low · °F
⭐ December 2025 · latest complete year☔ 14 days · 73.8 mm
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
30.2°C/25°C
🌧️ 12.7 mm
2
31.2°C/27.2°C
No rain
3
31°C/27°C
No rain
4
31.5°C/26.8°C
No rain
5
30.4°C/26°C
🌧️ 5.7 mm
6
31.4°C/26.6°C
🌧️ 1.8 mm
7
32.9°C/26.8°C
No rain
8
30.7°C/26.1°C
🌧️ 4.1 mm
9
31.4°C/26.1°C
No rain
10
30.9°C/25.9°C
No rain
11
31.7°C/26.4°C
No rain
12
31.9°C/26.1°C
No rain
13
31.9°C/27.1°C
No rain
14
29.3°C/25.5°C
🌧️ 5.7 mm
15
31.6°C/25.3°C
🌧️ 4.4 mm
16
31.8°C/26.4°C
No rain
17
31.1°C/25.1°C
🌧️ 2.6 mm
18
31.7°C/26.2°C
No rain
19
32.3°C/26°C
No rain
20
30.6°C/24.7°C
🌧️ 8.9 mm
21
31.2°C/26.4°C
No rain
22
27.8°C/25.2°C
🌧️ 4.9 mm
23
28.4°C/24.1°C
🌧️ 6.9 mm
24
29.3°C/23.9°C
🌧️ 3.9 mm
25
31.2°C/26.3°C
No rain
26
31°C/26°C
🌧️ 2.4 mm
27
30.8°C/24.8°C
🌧️ 1.7 mm
28
31.9°C/25.4°C
No rain
29
31.4°C/25.6°C
No rain
30
31.8°C/25°C
No rain
31
30.4°C/25.8°C
🌧️ 3 mm
December 2024☔ 21 days · 77.3 mm
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
32.4°C/26.2°C
🌧️ 1.7 mm
2
32.7°C/25.4°C
🌧️ 2.3 mm
3
30.2°C/25.1°C
🌧️ 12.2 mm
4
30.4°C/24.4°C
🌧️ 11 mm
5
32.7°C/27°C
No rain
6
31.2°C/25.6°C
🌧️ 3.8 mm
7
31.5°C/26.8°C
🌧️ 1.9 mm
8
32.2°C/26.9°C
No rain
9
32.7°C/26.5°C
No rain
10
32.3°C/25.6°C
No rain
11
31°C/26.8°C
🌧️ 3 mm
12
32°C/26.5°C
No rain
13
31.7°C/25.3°C
🌧️ 1.4 mm
14
31.9°C/27.2°C
No rain
15
31.8°C/26.4°C
🌧️ 1.5 mm
16
31.2°C/24.4°C
🌧️ 4.1 mm
17
32°C/25.2°C
🌧️ 2.3 mm
18
29.9°C/25°C
🌧️ 6 mm
19
30.7°C/25.3°C
🌧️ 5.6 mm
20
31.1°C/25.1°C
🌧️ 1.5 mm
21
31.9°C/26.5°C
🌧️ 1.4 mm
22
31.7°C/25.9°C
🌧️ 3.3 mm
23
31.2°C/25.9°C
🌧️ 1.3 mm
24
31.1°C/26.6°C
🌧️ 1.1 mm
25
30.2°C/25.2°C
🌧️ 5 mm
26
30.9°C/26.5°C
No rain
27
31.5°C/27°C
No rain
28
31.6°C/26°C
No rain
29
30.9°C/25°C
🌧️ 2.3 mm
30
32.1°C/27°C
No rain
31
30.8°C/25.9°C
🌧️ 1 mm
December 2023☔ 23 days · 88.6 mm
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
29.9°C/23.6°C
🌧️ 4.8 mm
2
29.1°C/24.5°C
🌧️ 3.4 mm
3
28.9°C/24.9°C
🌧️ 3.8 mm
4
29.8°C/25.5°C
No rain
5
30.4°C/25.9°C
🌧️ 1.3 mm
6
30°C/25.4°C
🌧️ 1 mm
7
30.2°C/25.3°C
No rain
8
30.2°C/25.2°C
🌧️ 1 mm
9
30.3°C/24.3°C
🌧️ 3 mm
10
30.7°C/25.5°C
🌧️ 2 mm
11
30.5°C/25.6°C
No rain
12
29.5°C/24°C
🌧️ 3.6 mm
13
31.1°C/26.5°C
No rain
14
29.2°C/26.1°C
🌧️ 2.7 mm
15
29.6°C/26.6°C
🌧️ 1.5 mm
16
30.8°C/26.1°C
No rain
17
30.1°C/25.7°C
No rain
18
28.7°C/23.5°C
🌧️ 15.5 mm
19
29.7°C/26.6°C
🌧️ 2 mm
20
30°C/25.5°C
No rain
21
30.2°C/24.9°C
🌧️ 1.3 mm
22
30.1°C/24.8°C
🌧️ 1.4 mm
23
29.1°C/25.4°C
No rain
24
29.3°C/25.5°C
🌧️ 2.6 mm
25
30°C/24.3°C
🌧️ 9.6 mm
26
29.9°C/23.8°C
🌧️ 4.4 mm
27
28.5°C/24.3°C
🌧️ 2.9 mm
28
29.1°C/24.7°C
🌧️ 2.7 mm
29
29.5°C/25.7°C
🌧️ 3.7 mm
30
29.6°C/24.9°C
🌧️ 1.7 mm
31
29.4°C/24.4°C
🌧️ 9.1 mm
Historical calendars use Open-Meteo reanalysis data. A rainy day is counted when daily precipitation is at least 1 mm. Conditions at a specific hotel, beach or station can differ.
✈️ Traveling soon?
Current Guam weather and 7-day forecast
When departure is close, the latest forecast matters more than long-term averages.
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Forecast data: MET Norway · CC BY 4.0 · cached by Travel Weather Fairy
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Guam weather in other months
Switch months to compare the seasonal pattern.