Weather in Guam in May 2026
Average weather
Average temperature in Guam in May
The expected average maximum temperature in May is +86°F with a maximum of +90°F and a minimum of +73°F.
The average maximum temperature goes down 11% by the end of the month, compared with the beginning of the month, from +86°F to +84°F.
Is Guam warm or cold in May?
Guam is typically warm in May.
Maximum temperatures go up compared to the previous month from +84°F to +84°F. The minimum temperature also goes up from +79°F to +79°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how May is compared to other months in Guam:
Climate in Guam in May
| April | May | June | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +84°F | +84°F | +86°F | ||||
| Min. temperature | ||||||
| +73°F | +73°F | +73°F | ||||
| Max. temperature | ||||||
| +93°F | +93°F | +91°F | ||||
| Rainfall | ||||||
| 101 mm | 132 mm | 209 mm | ||||
| Wind | ||||||
| 5 m/s | 4 m/s | 4 m/s | ||||
| Humidity | ||||||
| 79% | 79% | 80% | ||||
| Air pressure | ||||||
| 1010 HPa | 1010 HPa | 1010 HPa | ||||
| Sunny days | ||||||
| 2 | 2 | 1 | ||||
| Cloudy days | ||||||
| 3 | 3 | 1 | ||||
| Rainy days | ||||||
| 24 | 26 | 27 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
May weather is still as ok as in April. The temperature levels stay the same in the area of +84°F for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 101 mm to 132 mm. Humidity levels don’t change as the month goes on, averaging around 79%. Winds are calmer in comparison to April, going down from 5 m/s to 4 m/s on average. The amount of sunny days stay about the same, averaging 2 sunny days during the month.
June brings much the same weather, it remains ok.
Wind
The average wind speed is 5 m/s getting up to 20 m/s which is quite strong. The wind will cause branches to move and ground debris to fly around.
The average wind speed in Guam is gradually decreasing during May, going from 6 m/s to 4 m/s over the course of the month.
Rain
How was the weather last May in Guam?
Climate Change Over the Years
The climate in Guam in May has not changed that much over the last 43 years.
The average temperature was the lowest in 1983 (+80°F) and the highest in 2018 (+88°F). The driest year was 1983 with only 1154 mm of rainfall, and the wettest year was 2023 with 4623 mm.
FAQ
Is May a good time to visit Guam?
Can you sunbathe in Guam in May?
Is Guam rainy in May?
Is it sunny in Guam in May?
Monthly weather in Guam
Source of the data
For this page, we’ve looked at the typical weather in Guam, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
