The best times to visit Guam for ideal weather are
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Guam Travel Guide
Weather in Guam
Average temperatures in Guam vary barely at all. Considering humidity, temperatures feel hot all year with a chance of rain throughout most of the year. The area is far less temperate than some — in the bottom 1 percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Guam, the hottest months are June, May, and then November. See average monthly temperatures below. The warmest time of year is generally early to mid June where highs are regularly around 88.1°F (31.2°C) with temperatures rarely dropping below 78.4°F (25.8°C) at night.
Guam Temperatures (Fahrenheit)
Guam Temperatures (Celsius)
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
Guam Perceived Temperature (F)
Guam Perceived Temperature (C)
Average Guam Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Guam are February, March, and then April. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid March. For example, on the week of March 19th there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in early to mid September with an average of 5 days of significant precipitation the week of September 10th.
When can you find snow in Guam? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
The graph below shows the % chance of rainy and snowy days in Guam.
Snow on the Ground
The graph below shows the average snow on the ground in Guam (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Guam has some extremely humid months, and high humidity throughout the year. The least humid month is March (71.1% relative humidity), and the most humid month is September (82.3%).
Wind in Guam is usually moderate. The windiest month is March, followed by January and February. March’s average wind speed of around 11.6 knots (13.3 MPH or 21.4 KPH) is considered “a moderate breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid January where average top sustained speeds reach 19 knots, which is considered a fresh breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Guam.
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
|Month||Avg. Wind||Avg. Wind Feel||Sustained High Wind||High Wind Feel|
|Jan||11.6||Significant breeze||17.9||Strong breeze|
|Feb||11.3||Significant breeze||17.2||Strong breeze|
|Mar||11.6||Significant breeze||17.4||Strong breeze|
|Apr||10.4||Gentle breeze||16||Significant breeze|
|May||9||Gentle breeze||14.8||Strong breeze|
|Jun||8.5||Gentle breeze||14.4||Significant breeze|
|Jul||7.1||Gentle breeze||14.1||Strong breeze|
|Aug||6||Light breeze||13.2||Significant breeze|
|Sep||6.6||Light breeze||14.2||Strong breeze|
|Oct||7.6||Gentle breeze||14.8||Significant breeze|
|Nov||10.5||Gentle breeze||17.1||Strong breeze|
|Dec||11||Significant breeze||17.2||Strong breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Guam?
Our best data indicates this area is generally safe. As of Mar 17, 2019 there are no travel advisories or warnings for Guam; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Feb 27, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in Guam is February, followed by January and June. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Guam in December. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall Guam Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel warm. Highs range from 87.6°F (30.9°C) and 84.5°F (29.2°C) with warmer temperatures in the later months. Rain is somewhat common with 8 to 10 days of significant precipitation per month. Spring is fairly slow for tourism, which makes it a good time for those looking for deals.
Summer (June through August)
The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see moderate precipitation with 11 to 18 days of precipitation per month. June – August is the busiest season for tourism in Guam, so lodging and other accommodations may cost more than usual.
Fall (September through November)
Fall daily highs range from 86.9°F (30.5°C) and 85.5°F (29.7°C), which will feel very nice given the humidity and wind. It rains or snows a great amount: 13 to 19 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.
Winter (December through February)
Weather is perfect this time of year in Guam to be enjoyable for warm weather travelers. The average high during this season is between 86.1°F (30.1°C) and 84.2°F (29°C). On average, it rains or snows a great amount: 7 to 12 times per month. These times of year are the second busiest with tourists.
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