Guam weather

Our guide to the weather in Guam during May

29

Average high

6

UV Index

165mm

Monthly rainfall

78%

Humidity

We've looked at the most up-to-date weather data for Guam, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Guam weather in May.

How warm is it in Guam during May?

The temperature is extremely stable in May with average highs of 29℃ and lows just 1℃ lower at 28℃. Of course, the high humidity will make it feel even hotter. The UV index will be high at this time of year, so protection against skin and eye damage is needed. Try to limit exposure between 10am and 4pm. Apply broad spectrum SPF 30+ sunscreen every few hours, even if it's cloudy, or more frequently after sweating or swimming, and wear UV-blocking sunglasses too, and bear in mind that bright surfaces, such as sand and water increase UV exposure.

Does it rain in Guam during May?

On average, there will be 6 rainy days during the month, amounting to 164.9mm in total. That's a significant amount of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. Due to the high temperature and humidity, you might expect lots of thunderstorms, however they're actually fairly infrequent at this time of year. On average, May will see just 3 days that produce a storm.

Is it windy in Guam during May?

You're unlikely to experience any strong winds. Expect a gentle breeze that increases to moderate at times during May. The high humidity and warm temperature will make the breeze feel warm, so any cooling effect will be limted.

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Weather in Guam

Our month-by-month guide to the weather and climate in Guam

27.9

Guam weather in

January
27.5

Guam weather in

February
27.8

Guam weather in

March
28.3

Guam weather in

April
29.0

Guam weather in

May
29.3

Guam weather in

June
29.3

Guam weather in

July
29.3

Guam weather in

August
29.3

Guam weather in

September
29.0

Guam weather in

October
29.0

Guam weather in

November
28.5

Guam weather in

December