World Resorts Northern Mariana Islands Guam Weather

Guam sea water temperature

Current sea water temperature:
+82.6°F
Minimum sea water temperature in February: 83.7°F
Maximum sea water temperature in February: 80.2°F
Average sea water temperature in February: 82.1°F

Sea water temperature for the last 10 days:

February 4 82.6°F January 30 82.9°F
February 3 82.4°F January 29 82.9°F
February 2 82.4°F January 28 82.9°F
February 1 82.6°F January 27 82.8°F
January 31 82.9°F January 26 82.8°F

When is the warmest sea in Guam?

Based on the data about daily sea water temperature for the last three years the warmest sea in Guam was noticed in August, September and July.

Monthly Sea Temperatures in Guam, °F

Sea water temperature in August, °F

Show year:
2025
2024
2023

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

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.

Sea water temperature in July, °F

Show year:
2025
2024
2023

The average sea water temperature in July of 2025 was 84.7°F. The highest and lowest sea temperatures during the month were 85.5°F and 83.7°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 83.8 °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 16.5 mph

Guam on a weather map

Guam
+82°F
W 17 mph
Feels like: +88°F
Precip.: 71%
Places in Northern Mariana Islands:
Name
°F
+82°F
+82°F
+81°F
+81°F
+81°F
24 Hours Forecast
Guam
Local time: 11:00
February 05, thursday
1200
82°F
W
17 mph
1500
82°F
W
16 mph
1800
81°F
W
13 mph
2100
81°F
W
13 mph
February 06, friday
0000
79°F
W
13 mph
0300
79°F
W
11 mph
0600
79°F
W
9 mph
0900
81°F
SW
9 mph
Units of measurement: °C / °F