August could be a good time to visit Guam, as the weather is generally fine. The average high temperature is around +84°F, and there are typically 0 sunny days in August. However, expect about 29 rainy days, and total monthly rainfall of approximately 457 mm. The weather is changeable so pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+84°F
Avg. max. temperature
+73°F
Min.
+91°F
Max.
457 mm
Total precipitation
84%
Avg. humidity
3 m/s
Avg. wind
0 ☀️
Sunny Days
0 ⛅️
Cloudy
29 🌦
Rainy
Our opinion: Guam has OK weather in August.
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Average temperature in Guam in August
Here are the expected maximum, average and minimum temperatures in Guam for August based on the historical data.
Last Year
Historical Data
The expected average maximum temperature in August is +86°F with a maximum of +90°F and a minimum of +75°F.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +86°F to +86°F.
Is Guam warm or cold in August?
Guam is typically warm in August.
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 August is compared to other months in Guam:
Climate in Guam in August
Guam weather looks like this, on average, in August and the surrounding months.
July
August
September
Avg. temperature
+84°F
+84°F
+84°F
Min. temperature
+73°F
+73°F
+73°F
Max. temperature
+91°F
+91°F
+93°F
Rainfall
351 mm
457 mm
403 mm
Wind
3 m/s
3 m/s
2 m/s
Humidity
82%
84%
84%
Air pressure
1009 HPa
1008 HPa
1008 HPa
Sunny days
0
0
0
Cloudy days
0
0
0
Rainy days
29
29
28
Snowy days
0
0
0
August weather is still as ok as in July.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 351 mm to 457 mm.Humidity rises from 82% to 84%.The average wind speed doesn’t change much during August, staying around 3 m/s.The amount of sunny days stay about the same, averaging 0 sunny days during the month.
September brings much the same weather, it remains ok.
Wind speed in Guam in August based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Guam is gradually decreasing during August, going from 3 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during August in Guam based on historical data.
Last Year
Historical Data
Total precipitation in August is about 801 mm, with a 100% chance of rain on a typical day. The maximum amount of rainfall per day is around 96 mm, which is considered heavy rain.August is a pretty wet month with over 31 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
August is one of the rainiest months in Guam, here is a comparison with other months, total mm:
Guam wettest month is August, where a typical day has a 94% chance of precipitation and 457 mm of rainfall per day. March, on the other hand, is the driest month with a mere 77% chance of precipitation and 70 mm of rainfall per day.
How was the weather last August in Guam?
This is the weather in Guam in August 2024:
1 August
🌧️
+86°F
2 August
🌧️
+87°F
3 August
🌧️
+87°F
4 August
🌧️
+88°F
5 August
🌧️
+88°F
6 August
☁️
+88°F
7 August
🌧️
+87°F
8 August
🌧️
+87°F
9 August
🌧️
+86°F
10 August
🌧️
+84°F
11 August
🌧️
+81°F
12 August
🌧️
+85°F
13 August
🌧️
+86°F
14 August
🌧️
+83°F
15 August
🌧️
+87°F
16 August
☀️
+87°F
17 August
🌧️
+87°F
18 August
🌧️
+88°F
19 August
🌧️
+88°F
20 August
🌧️
+87°F
21 August
☀️
+86°F
22 August
🌧️
+88°F
23 August
🌧️
+89°F
24 August
🌧️
+86°F
25 August
🌧️
+88°F
26 August
🌧️
+87°F
27 August
🌧️
+88°F
28 August
🌧️
+87°F
29 August
🌧️
+88°F
30 August
🌧️
+84°F
31 August
🌧️
+85°F
In August 2024 Guam had 2 sunny days, 1 cloudy days, and 28 rainy days. The average maximum temperature was +86°F, with an absolute maximum of +90°F and a minimum of +81°F. The average humidity was 85%, with a maximum of 98% and a minimum of 69%. The average wind speed was 3 m/s, with a maximum of 10 m/s and a minimum of 0 m/s.
Are you planning a trip in August?
Climate Change Over the Years
This is how Guam climate has changed over the last 43 years.
The climate in Guam in August 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
Frequently asked questions about the weather in Guam in August:
Is August a good time to visit Guam?
It’s always a good time to visit Guam, but the weather is changeable in August, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Guam in August?
August is warm in Guam. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Is Guam rainy in August?
Guam is often rainy in August. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Guam in August?
Usually, it’s not very sunny in Guam in August, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
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.
