World Resorts Northern Mariana Islands Guam Weather

Guam Sea Temperature in September

Average sea water temperature in September:
+85.4°F
Minimum sea water temperature in September: 87.4°F
Maximum sea water temperature in September: 83.3°F

Daily 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.

Monthly sea water temperature in Guam, °F

Which Northern Mariana Islands resorts have warmest sea in September?

Place name September 2025 September 2024
Rota 85.6°F 86.1°F
Saipan 85.2°F 85.8°F
Susupe 85.2°F 85.8°F
Tinian 85.2°F 85.9°F
Guam 85.0°F 85.9°F

Best time for vacation in Guam

Sunniest months:
July 5 days
August 5 days
September 5 days
Warmest months:
June 87.5 °F
July 87.3 °F
August 87.0 °F
Warmest sea temp:
August 85.5 °F
September 85.4 °F
July 85.3 °F
Coldest months:
February 83.2 °F
January 83.9 °F
March 84.2 °F
Rainiest months:
October 15 days
August 14 days
September 14 days
Windiest months:
February 17.4 mph
December 17.2 mph
January 16.8 mph

Guam on a weather map

Current weather
07:18
Guam
+79°F
W 12 mph
Feels like: +84°F
Precip.: 79%
Places in Northern Mariana Islands:
Name
°F
Guam
+79°F
Rota
+82°F
Saipan
+81°F
Susupe
+81°F
Tinian
+81°F
24 Hours Forecast
Guam
Local time: 07:18
December 29, monday
0900
82°F
W
15 mph
1200
82°F
SW
14 mph
1500
82°F
SW
13 mph
1800
81°F
W
14 mph
2100
81°F
SW
12 mph
December 30, tuesday
0000
81°F
SW
13 mph
0300
81°F
SW
13 mph
0600
79°F
SW
13 mph
Units of measurement: °C / °F