Guam (Dededo Village)
September
Weather in Guam for September 2026
Your guide to Guam weather in September - trends and predictions
Until now, September 2026 in Guam has been nearly identical to the historical average, with a temperature of 29.2 °C (showing only a slight deviation of 0.2 °C).
Expect cooler weather in the next days in Guam with the forecast suggesting a temperature of 28.7 °C, lower than the historical average.
In general, the average temperature in Guam at the beginning of September is 29.1 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 29.4 °C by the end of September.
Guam experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 486.4 mm.
Temperatures
Rain 🌧️
2
Dry days
28
Rainy days
0
Snow days
29°/26°
Temperatures
21 km/h
Avg max wind
79 %
Avg humidity
Guam Weather September
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What’s the Weather Like in Guam This September?
Discover the average temperatures and weather trends across Guam’s cities this September.
Temperatures trend during September in Guam
See the weather trend as well as the moving average line
September weather in Guam day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 29° /26° | 41.9 mm | 5 | |
| 2 Sept. |  Moderate or heavy rain shower | 29° /26° | 19.3 mm | 5 | |
| 3 Sept. | Light rain shower | 29° /26° | 15.4 mm | 5 | |
| 4 Sept. | Patchy rain possible | 30° /27° | 11.2 mm | 6 | |
| 5 Sept. |  Patchy light rain with thunder | 29° /26° | 7.1 mm | 5 | |
| 6 Sept. | Light rain shower | 29° /26° | 10.5 mm | 6 | |
| 7 Sept. | Patchy rain possible | 29° /26° | 3.7 mm | 6 | |
| 8 Sept. | Patchy rain possible | 29° /26° | 10.5 mm | 8 | |
| 9 Sept. | Moderate or heavy rain shower | 29° /26° | 26.4 mm | 5 | |
| 10 Sept. | Moderate or heavy rain shower | 29° /26° | 31.2 mm | 5 | |
| 11 Sept. |  Torrential rain shower | 29° /26° | 22.3 mm | 7 | |
| 12 Sept. | Moderate rain at times | 29° /26° | 22.3 mm | 7 | |
| 13 Sept. |  Thundery outbreaks possible | 29° /25° | 20 mm | 7 | |
| 14 Sept. | Moderate rain at times | 29° /26° | 6.3 mm | 6 | |
| 15 Sept. | Moderate or heavy rain shower | 29° /26° | 25.6 mm | 5 | |
| 16 Sept. | Moderate or heavy rain shower | 29° /26° | 35.1 mm | 5 | |
| 17 Sept. | Moderate or heavy rain shower | 29° /25° | 19.6 mm | 5 | |
| 18 Sept. | Moderate or heavy rain shower | 29° /26° | 9.8 mm | 5 | |
| 19 Sept. | Light rain shower | 29° /26° | 11.7 mm | 5 | |
| 20 Sept. | Light rain shower | 29° /26° | 11.9 mm | 5 | |
| 21 Sept. | Light rain shower | 29° /26° | 7.6 mm | 5 | |
| 22 Sept. | Light rain shower | 28° /26° | 9 mm | 5 | |
| 23 Sept. | Patchy rain possible | 29° /26° | 6.8 mm | 6 | |
| 24 Sept. | Patchy light rain with thunder | 30° /26° | 8.5 mm | 5 | |
| 25 Sept. | Moderate or heavy rain shower | 30° /27° | 6.2 mm | 5 | |
| 26 Sept. | Light rain shower | 29° /27° | 8.2 mm | 6 | |
| 27 Sept. | Patchy rain possible | 30° /27° | 10.3 mm | 12.3 | |
| 28 Sept. | Patchy rain possible | 29° /27° | 2.5 mm | 12.4 | |
| 29 Sept. | Patchy rain possible | 29° /27° | 0.5 mm | 12.1 | |
| 30 Sept. | Light rain shower | 29° /28° | 10.6 mm | 11 | |
| Next | |||||
Important Notice
Our weather forecast for Guam in September 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 forecast closer to your planned date for the most up-to-date weather information.
Change Month
Guam in September - FAQ
What are the expected maximum and minimum temperatures in Guam during September?
During September, 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 during September?
Significant rainfall exceeding 486.4 mm is expected in Guam during September, occurring over more than 28 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Guam during September?
The average wind speed in Guam during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Guam
Explore the daily rainfall trends and prepare for Guams September weather 💧
Typically, Guam has 28 rainy days in September with a total of 486.4 mm of rainfall.
UV exposure in Guam during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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