Guam Island
December
Weather in Guam Island for December 2025
Your guide to Guam Island weather in December - trends and predictions
High Surf Advisory - See hour by hour.
The forecast for the next days in Guam Island predicts temperatures to be around 29 °C, close to the historical average.
In general, the average temperature in Guam Island at the beginning of December is 28.6 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 28.4 °C by the end of December.
Guam Island experiences heavy rainfall in December, with over 20 rainy days and an average total precipitation 110.7 mm.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
6
Dry days
25
Rainy days
0
Snow days
29°/26°
Temperatures
29 km/h
Avg max wind
79 %
Avg humidity
Guam Island Weather December
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Temperatures trend during December in Guam Island
See the weather trend as well as the moving average line
December weather in Guam Island day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Dec. |  Moderate rain at times | 30° /27° | 1.7 mm | 7 | |
| 2 Dec. |  Patchy rain possible | 28° /27° | 0.1 mm | 2.1 | |
| 3 Dec. | Patchy rain possible | 28° /27° | 0.2 mm | 2 | |
| 4 Dec. |  Moderate rain | 27° /27° | 16.4 mm | 1.9 | |
| 5 Dec. | Moderate rain | 29° /27° | 12.9 mm | 1.5 | |
| 6 Dec. | Patchy rain possible | 29° /26° | 0.8 mm | 6 | |
| 7 Dec. | Patchy rain possible | 29° /27° | 0.9 mm | 6 | |
| 8 Dec. | Patchy rain possible | 29° /26° | 1.7 mm | 6 | |
| 9 Dec. | Patchy rain possible | 29° /27° | 0.3 mm | 6 | |
| 10 Dec. | Patchy rain possible | 29° /27° | 1.8 mm | 6 | |
| 11 Dec. | Patchy rain possible | 29° /27° | 0.5 mm | 6 | |
| 12 Dec. | Patchy rain possible | 28° /26° | 0.7 mm | 6 | |
| 13 Dec. | Patchy rain possible | 29° /27° | 1.1 mm | 6 | |
| 14 Dec. | Patchy rain possible | 29° /27° | 1.2 mm | 6 | |
| 15 Dec. | Patchy rain possible | 29° /26° | 0.9 mm | 6 | |
| 16 Dec. | Moderate rain at times | 29° /25° | 7.2 mm | 6 | |
| 17 Dec. | Patchy rain possible | 29° /26° | 2.1 mm | 6 | |
| 18 Dec. | Moderate or heavy rain shower | 28° /26° | 10.4 mm | 6 | |
| 19 Dec. |  Heavy rain at times | 28° /26° | 7.8 mm | 6 | |
| 20 Dec. | Heavy rain at times | 28° /26° | 3.7 mm | 6 | |
| 21 Dec. | Patchy rain possible | 28° /27° | 3.2 mm | 6 | |
| 22 Dec. | Moderate rain at times | 29° /27° | 5.3 mm | 6 | |
| 23 Dec. | Patchy rain possible | 29° /26° | 1.5 mm | 6 | |
| 24 Dec. | Moderate rain at times | 28° /26° | 1.6 mm | 6 | |
| 25 Dec. | Moderate rain at times | 28° /26° | 4.5 mm | 6 | |
| 26 Dec. | Patchy rain possible | 28° /27° | 0.9 mm | 6 | |
| 27 Dec. | Patchy rain possible | 29° /27° | 0.8 mm | 6 | |
| 28 Dec. | Patchy rain possible | 29° /26° | 1.2 mm | 6 | |
| 29 Dec. | Moderate rain at times | 28° /26° | 3 mm | 6 | |
| 30 Dec. |  Cloudy | 29° /27° | 0.1 mm | 6 | |
| 31 Dec. | Patchy rain possible | 28° /27° | 0.4 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Guam Island in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Guam Island forecast closer to your planned date for the most up-to-date weather information.
Change Month
Guam Island in December - FAQ
What are the expected maximum and minimum temperatures in Guam Island during December?
During December, expect a variety of temperatures with highs around 29° and lows near 26°, suitable for diverse activities and preferences.
How much rainfall should be expected in Guam Island during December?
Significant rainfall exceeding 110.7 mm is expected in Guam Island during December, occurring over more than 25 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Guam Island during December?
The average wind speed in Guam Island during December is 29 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in Guam Island
Explore the daily rainfall trends and prepare for Guam Islands December weather 💧
Typically, Guam Island has 25 rainy days in December with a total of 110.7 mm of rainfall.
UV exposure in Guam Island during December
Stay informed about UV levels for safe outdoor activities throughout the month of December ☀️
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