Measurements:
°C
°F
Guam
86°F
W 14 mph
Feels like: 94°F
Precip: 100%
World Resorts Northern Mariana Islands Guam Weather May Weather in Guam

Guam Weather: May

Average Day Temperature: 90.9°F
Average Night Temperature: 85.7°F
Sea Water Temperature: 88.0°F
Number of Sunny Days: 4 days
Sunshine Hours: 12.6 - 12.9 hours
Number of Rainy Days: 6 days
Precipitation Totals: 3.6 in

Air Temperature in May, °F

Select Year: 2025 2024 2023

The highest day temperature in May 2025 was 90°F. The lowest night temperature was 83°F. The average values for day and night temperatures during May were 88.9°F и 84.1°F respectivly.

Guam Water Sea Temperature in May, °F

Select Year: 2025 2024 2023

The average sea surface temperature in May 2025 for Guam was 88.1°F. The maximum and minimum values were 87.6°F and 89.2°F respectively.

Sunny, Cloudy and Gloomy days

Most of the days in May are cloudy but you can also expect sunny or gloomy days.

Precipitation Totals in May, in

Precipitation total in May for Guam is 3.6 in.

Wind Speed in May, mph

The average wind speed in May is 13.0 mph.

Average Sunny Hours Per Day

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Guam in May is 6.5 hours.

Best Time to Visit Guam
The most sunny months:
July 5 days
August 5 days
September 5 days
The most warm months:
June 91.6 °F
July 91.5 °F
August 91.1 °F
Warmest sea temperature:
August 89.4 °F
September 89.4 °F
July 89.2 °F
The most cold months:
February 86.9 °F
January 87.6 °F
March 88.0 °F
The most rainy months:
October 15 days
August 14 days
September 14 days
The most windy months:
February 17 mph
December 17 mph
January 17 mph

Guam on the Weather Map

Northern Mariana Islands Resorts:
NAME
Guam +86
Rota +88
Saipan +88
Susupe +88
Tinian +88
24 Hours Weather Forecast
Guam
Local time: 18:02
05 dec, friday
2100 86°F
W
13 mph
06 dec, saturday
0000 84°F
W
13 mph
0300 84°F
W
12 mph
0600 84°F
W
12 mph
0900 86°F
W
15 mph
1200 88°F
W
14 mph
1500 88°F
W
13 mph
1800 86°F
W
11 mph