Guam Weather in August
Guam in August sees high temperatures, with highs around 30°C (86°F) and overnight lows of 26°C (79°F). Rainfall is at its peak this month, around 362 mm (14 in) on average, so waterproofs are essential.
Rainfall in Guam in August
As part of the rainy season, Guam sees around 20 days of rain in August, with an average of 362 mm (14 in). The rain this month falls heavily when it arrives. Late afternoons in particular can see strong showers, so waterproofs are worth keeping handy.
Temperature in Guam in August
August in Guam sees highs of 30°C (86°F) and lows of 26°C (79°F) overnight. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights are warm at 26°C (79°F), which can make sleeping uncomfortable. Keeping windows open or using a fan can help. A cold shower before bed is also a good way to cool down.
Sunshine in Guam in August
The city usually sees around 143 hours of sunlight, indicating a moderately sunny period (despite it being part of rainy season).August in Guam can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Micronesia, check out our Guam's climate page.
Guam Temperature in August
Min Temperature
26°C (79°F)
Max Temperature
30°C (86°F)
Chance of Rain
68%
Precipitation
362 mm (14 in)
Rainy days
20 days
Sunshine
143 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Guam typically stay consistent throughout August, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 25°C (77°F).
Average temperatures in August
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in August
Historical weather for Guam in August
Browse day-by-day weather records for Guam spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Guam historical weather extremes in August
According to our 49 years of weather records for Guam, the following extremes were recorded between 1976 and 2025.
- The hottest August day on record in Guam reached 36°C (97°F) (August 9, 2021).
- The coldest August day was on August 7, 1985, with a maximum of 26°C (79°F).
- The lowest overnight temperature recorded in August was 22°C (72°F) (August 27, 2004).
Best Places in Micronesia in August
Find out more about the weather in Micronesia and which places have the best travel conditions in this month. See all of Micronesia in August →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Guam in August
Warm temperatures in August make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Guam in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Micronesia, check out our Guam's climate page.
See the full Guam climate overview or explore weather in Micronesia.
