Guam (Marianas) in september: average Weather, Temperature and Climate
Weather in Guam (Marianas) in september 2025
The weather in Marianas in the month of september comes from statistical datas on the past years. You can view the weather statistics for all the month, but also by using the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
very bad weather UV index: 7
Weather at 6am
85°F
Moderate rain at times
39% of time
27%
24%
6%
Weather at 12pm
86°F
Moderate rain at times
42% of time
23%
22%
10%
Weather at 6pm
85°F
Moderate rain at times
41% of time
24%
22%
10%
Weather at 3am
85°F
35%
35%
22%
5%
Evolution of daily average temperature and precipitation in Guam (Marianas) in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Guam (Marianas) in september.
The climate of Guam (Marianas) in september is very bad
In september in Marianas, the climate is wet (with 20.8in of rainfall over 21 days). The weather is worst than the previous month since in august there is an average of 19.8in of precipitation over 22 days.
The climate quite good there september. The thermometer averaged maximum of 86°F. On average, the recorded minimum temperature is 85°F. Thus, the mean temperature average in september in Marianas is 85°F. Note that seasonal normals are in contrast with those observed in Marianas in september with a maximum record of 92°F in 2021 and a minimum record of 77°F in 2021. You can plan to have 86°F or more across the month.
Day length in Marianas in september is 12:12. The sun rises at 06:10 and sunset is at 18:22.
September: another location in Micronesia?
If you want to go to Micronesia in september, there are destinations with better weather than Guam (Marianas):
In september, Nauru has good weather.
Finally, Chuuk Lagoon (Caroline Islands), Kosrae Island, Palaos, Palikir, Pohnpei and Yap islands have a tolerable climate, but better than Guam (Marianas).
Seasonal average climate and temperature of Guam (Marianas) in september
Check below seasonal norms These datas are set from the weather statements of the last years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 85°F | ||||
| Highest temperature | 86°F | ||||
| Lowest temperature | 85°F | ||||
| Highest record temperature | 92°F (2021) | ||||
| Lowest record temperature | 77°F (2021) | ||||
| Number of days at +86°F | 12 day(s) (40%) | ||||
| Number of days at +65°F | 30 day(s) (100%) | ||||
| Sea temperature | |||||
| Average sea temperature | 86°F | ||||
| Lowest sea temperature | 85°F | ||||
| Highest sea temperature | 87°F | ||||
| Wind | |||||
| Wind speed | 20km/h | ||||
| Wind temperature | 85°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 20.8in | ||||
| Number of days with rainfall | 21 day(s) (71%) | ||||
| Record daily rainfall | 14.2in (2018) | ||||
| Other climate data | |||||
| Humidity | 79% | ||||
| Visibility | 8.68km | ||||
| Cloud cover | 45% | ||||
| UV index | 7 | ||||
| Daily sunshine hours | 11 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:10 | ||||
| Time of sunset | 18:22 | ||||
| Length of day | 12:12 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | very bad | ||||
How was the weather last september?
Here is the day by day recorded weather in Guam (Marianas) in september 2024:
81°F to 86°F
81°F to 83°F
81°F to 86°F
81°F to 86°F
83°F to 86°F
83°F to 86°F
83°F to 86°F
83°F to 86°F
83°F to 86°F
79°F to 83°F
81°F to 83°F
79°F to 83°F
79°F to 83°F
81°F to 83°F
79°F to 81°F
79°F to 81°F
79°F to 83°F
81°F to 83°F
83°F to 85°F
83°F to 85°F
83°F to 85°F
83°F to 85°F
81°F to 85°F
81°F to 85°F
81°F to 85°F
81°F to 85°F
83°F to 86°F
81°F to 85°F
83°F to 86°F
83°F to 86°F
Map: other cities in Micronesia in september
Cities near Guam (Marianas):
| Yap islands in september | tolerable weather |
| Chuuk Lagoon (Caroline Islands) in september | tolerable weather |
| Palaos in september | tolerable weather |
| Palikir in september | tolerable weather |
| Pohnpei in september | tolerable weather |
| Kosrae Island in september | tolerable weather |
| Nauru in september | good weather |
| Marshall islands in september | bad weather |
Click over cities on the map for information about the weather in september.
Guam
(Marianas)
perfect weather
good
tolerable
bad
very bad
Weather data for Guam (Marianas) in september:
Weather data for Guam (Marianas) for september are derived from an average of the weather forecast since 2009 in Guam (Marianas). There is a margin of error and these forecasts are to be considered as general information only. The weather in Guam (Marianas) can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Guam (Marianas).