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:
2026
2025
2024

The average sea water temperature in September of 2026 was 85.3°F. The highest and lowest sea temperatures during the month were 85.8°F and 84.9°F.

Monthly sea water temperature in Guam, °F

Which Northern Mariana Islands resorts have warmest sea in September?

Place name September 2026 September 2025
Rota 85.7°F 85.6°F
Saipan 85.5°F 85.2°F
Tinian 85.5°F 85.2°F
Susupe 85.5°F 85.2°F
Guam 85.3°F 85.0°F

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
00:21
Guam
+82°F
SE 4 mph
Feels like: +91°F
Precip.: 58%
Places in Northern Mariana Islands:
Name
°F
Guam
+82°F
Rota
+82°F
Saipan
+84°F
Susupe
+84°F
Tinian
+84°F
24 Hours Forecast
Guam
Local time: 00:21
September 20, sunday
0300
82°F
S
2 mph
0600
82°F
NW
2 mph
0900
84°F
N
4 mph
1200
84°F
N
4 mph
1500
84°F
NE
6 mph
1800
82°F
NE
4 mph
2100
82°F
NE
4 mph
September 21, monday
0000
82°F
NE
4 mph
Units of measurement: °C / °F