World Resorts Northern Mariana Islands Guam Weather

Guam 7 Days Forecast

13.09
sun
Day
84°F
SW 4 mph
Precip.
25%
Night
81°F
SW 2 mph
Precip.
10%
14.09
mon
Day
84°F
S 5 mph
Precip.
19%
Night
79°F
SW 2 mph
Precip.
11%
15.09
tue
Day
82°F
S 7 mph
Precip.
66%
Night
81°F
E 2 mph
Precip.
57%
16.09
wed
Day
84°F
E 9 mph
Precip.
60%
Night
81°F
E 8 mph
Precip.
13%
17.09
thu
Day
84°F
E 13 mph
Precip.
34%
Night
82°F
E 12 mph
Precip.
35%
18.09
fri
Day
84°F
E 16 mph
Precip.
25%
Night
82°F
E 11 mph
Precip.
70%
19.09
sat
Day
84°F
E 12 mph
Precip.
30%
Night
82°F
E 7 mph
Precip.
53%

Sea water temperature in September, °F

Show year:
2025
2024
2023

The average sea water temperature in September of 2025 was 85.0°F. The highest and lowest sea temperatures during the month were 85.8°F and 84.0°F.

Air temperature in Guam, °F

Precipitation total in Guam, in.

* Charts above show average data for the last 3 years.

Best time for vacation in Guam

Sunniest months:
July 5 days
September 5 days
May 4 days
Warmest months:
June 87.3 °F
July 87.1 °F
August 86.8 °F
Warmest sea temp:
September 85.4 °F
August 85.4 °F
July 85.3 °F
Coldest months:
February 83.1 °F
January 83.8 °F
March 84.0 °F
Rainiest months:
October 15 days
September 14 days
July 13 days
Windiest months:
February 17.3 mph
December 17.2 mph
January 16.5 mph

Guam on a weather map

Current weather
08:28
Guam
+82°F
SW 4 mph
Feels like: +90°F
Precip.: 8%
Places in Northern Mariana Islands:
Name
°F
Guam
+82°F
Rota
+81°F
Saipan
+84°F
Susupe
+84°F
Tinian
+84°F
24 Hours Forecast
Guam
Local time: 08:28
September 13, sunday
0900
82°F
SW
4 mph
1200
84°F
SW
4 mph
1500
84°F
S
5 mph
1800
82°F
SW
5 mph
2100
82°F
SW
4 mph
September 14, monday
0000
81°F
SW
2 mph
0300
81°F
S
2 mph
0600
81°F
SW
3 mph
Units of measurement: °C / °F