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Guam weather in September

Weather in Guam: September

Average day temperature: 86.8°F
Average night temperature: 82.5°F
Sea water temperature: 85.5°F
Number of sunny days: 5 days
Day length: 12.0 - 12.4 hours
Number of rainy days: 14 days
Precipitation totals: 10.4 in.

Air temperature in September, °F

Show year:
2024
2023
2022

The highest day temperature during September of 2024 was 86°F. At the same time the lowest night temperature was 78°F. Day and night temperature averages during September were 84.0°F and 81.4°F.

Sea water temperature in Guam in September, °F

Show year:
2024
2023
2022

The average sea water temperature in September of 2024 was 85.9°F. The highest and lowest sea temperatures during the month were 86.7°F and 84.7°F.

Sunny, partly cloudy and cloudy days

Mostly all days in September are partly cloudy but sunny or cloudy days are also possible.

Precipitation total in September, in.

Precipitation total value in Guam in September is 10.2 in. Other months of the year show relatively similar values.

Wind speed in September, mph

The average wind speed value in September is 9.0 mph It makes September lest windy month of the year.

Average sunny hours

This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 4.8.

Best time for vacation in Guam

Sunniest months:
July 6 days
August 5 days
September 5 days
Warmest months:
June 87.7 °F
July 87.6 °F
August 87.2 °F
Warmest sea temp:
August 85.5 °F
September 85.5 °F
July 85.4 °F
Coldest months:
February 83.3 °F
January 84.0 °F
March 84.3 °F
Rainiest months:
October 16 days
July 14 days
August 14 days
Windiest months:
December 17.4 mph
February 17.4 mph
January 16.9 mph

Guam on a weather map

Guam
+84°F
NW 6 mph
Feels like: +93°F
Precip.: 0%
Places in Northern Mariana Islands:
Name
°F
+84°F
+82°F
+84°F
+84°F
+84°F
24 Hours Forecast
Guam
Local time: 16:31
November 07, thursday
1800
82°F
NW
6 mph
2100
82°F
NW
5 mph
November 08, friday
0000
81°F
W
8 mph
0300
81°F
SW
9 mph
0600
81°F
SW
6 mph
0900
82°F
SW
8 mph
1200
81°F
SW
6 mph
1500
81°F
S
5 mph
Units of measurement: °C / °F