Weather forecast for 10 daysGuam, USA

Weather forecast for the weekend

Sunday Oct 18, 2026

  • 82°F
  • 79°F
Heavy Rain / Wind
Heavy Rain / Wind
  • Precip. probability: 99%
  • Precipitation: 4.69"
  • Wind: 65mphSE 137°
  • Humidity: 94%
  • UV index: 6
  • Sunrise: 6:11 am ChST
  • Sunset: 6:00 pm ChST
  • ▼
Tomorrow, on Sunday, October 18, downpours mixed with gusty winds are also anticipated, increasing the chance of fallen tree limbs.
Extreme precipitation of 4.69" is expected. Temperature readings will slightly shift from a daytime peak of a temperate 82.4°F to a nighttime low of a moderately hot 78.8°F.
The maximum heat index, which calculates the temperature value influenced by the moisture in the air, is evaluated at a blazing 93.2°F. Note that heat index values are valued for light wind and location in the shade.
Tomorrow, expect the temperature to remain near October's average maximum of 84.4°F.
Sunrise will be at 6:11 am and sunset at 6:00 pm; tomorrow's daylight will last for 11h and 49min.

Long-term weather forecast

  • Saturday
  • Oct 17, 2026
  • min.
  • 79°F
Heavy Rain / Wind
Heavy Rain / Wind
  • Precip. probability: 100%
  • Precipitation: 1.65"
  • Wind: 76mphNE 35°
  • Humidity: 92%
  • UV index: 0
  • Sunrise: 6:11 am ChST
  • Sunset: 6:01 pm ChST
  • ▼
  • Sunday
  • Oct 18, 2026
  • 82°F
  • 79°F
Heavy Rain / Wind
Heavy Rain / Wind
  • Precip. probability: 99%
  • Precipitation: 4.69"
  • Wind: 65mphSE 137°
  • Humidity: 94%
  • UV index: 6
  • Sunrise: 6:11 am ChST
  • Sunset: 6:00 pm ChST
  • ▼
  • Monday
  • Oct 19, 2026
  • 82°F
  • 81°F
Showers / Wind
Showers / Wind
  • Precip. probability: 73%
  • Precipitation: 0.59"
  • Wind: 21mphSSE 149°
  • Humidity: 89%
  • UV index: 6
  • Sunrise: 6:12 am ChST
  • Sunset: 5:59 pm ChST
  • ▼
  • Tuesday
  • Oct 20, 2026
  • 86°F
  • 79°F
PM Showers
PM Showers
  • Precip. probability: 36%
  • Precipitation: 0.08"
  • Wind: 12mphESE 109°
  • Humidity: 81%
  • UV index: 11
  • Sunrise: 6:12 am ChST
  • Sunset: 5:59 pm ChST
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 86°F
  • 79°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 20%
  • Precipitation: 0.08"
  • Wind: 11mphNE 56°
  • Humidity: 81%
  • UV index: 10
  • Sunrise: 6:12 am ChST
  • Sunset: 5:58 pm ChST
  • ▼
  • Thursday
  • Oct 22, 2026
  • 86°F
  • 79°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 24%
  • Precipitation: 0.04"
  • Wind: 12mphNE 55°
  • Humidity: 81%
  • UV index: 11
  • Sunrise: 6:12 am ChST
  • Sunset: 5:58 pm ChST
  • ▼
  • Friday
  • Oct 23, 2026
  • 84°F
  • 79°F
Isolated Thunderstorms
Isolated Thunderstorms
  • Precip. probability: 36%
  • Precipitation: 0.2"
  • Wind: 12mphENE 64°
  • Humidity: 83%
  • UV index: 11
  • Sunrise: 6:12 am ChST
  • Sunset: 5:57 pm ChST
  • ▼
  • Saturday
  • Oct 24, 2026
  • 84°F
  • 79°F
Scattered Thunderstorms
Scattered Thunderstorms
  • Precip. probability: 55%
  • Precipitation: 0.35"
  • Wind: 10mphENE 74°
  • Humidity: 84%
  • UV index: 11
  • Sunrise: 6:13 am ChST
  • Sunset: 5:57 pm ChST
  • ▼
  • Sunday
  • Oct 25, 2026
  • 84°F
  • 79°F
Scattered Thunderstorms
Scattered Thunderstorms
  • Precip. probability: 38%
  • Precipitation: 0.28"
  • Wind: 8mphE 80°
  • Humidity: 82%
  • UV index: 9
  • Sunrise: 6:13 am ChST
  • Sunset: 5:56 pm ChST
  • ▼
  • Monday
  • Oct 26, 2026
  • 86°F
  • 79°F
Showers
Showers
  • Precip. probability: 41%
  • Precipitation: 0.12"
  • Wind: 6mphENE 72°
  • Humidity: 81%
  • UV index: 11
  • Sunrise: 6:13 am ChST
  • Sunset: 5:56 pm ChST
  • ▼
Mixed conditions are forecasted for the coming ten days, and a mix of rainy, unstable, dull and sun-filled weather is expected.
Rainfall is predicted day-to-day, with daily precipitation varying from a minimal 0.04" to a maximum of 4.69".
The maximum temperature will be very similar in the upcoming days. Expected highs will hover between 82.4°F and 86°F, while the nighttime low will be also mostly stable, as night temperatures will lie between 78.8°F and 80.6°F.
With a maximum temperature of 86°F, Tuesday through Thursday and next Monday will be the hottest days in Hagåtña; Sunday and Monday, with the highest temperature of 82.4°F, will be the coldest days in Hagåtña.
Combining with the humidity, the maximum feel-like temperature may increase greatly and range between a hot 93.2°F and a sizzling 100.4°F.
Updated: Oct 17, 2026 @ 12:08:29 UTC
Published by: Weather Atlas | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

On Sunday, strong wind gusts with steady downpours are anticipated, requiring caution while commuting.

Yes, it will rain tomorrow. Weather alert - extreme precipitation of 4.69" is forecasted.

Tomorrow, the maximum temperature will be 82.4°F, while the minimum temperature will be 78.8°F. The maximum heat index, which combines air temperature and relative humidity, is estimated at 93.2°F.
Tomorrow, the maximum temperature will be in line with the average highest temperature in October. Tomorrow, the lowest temperature will be a couple of degrees lower than the average low temperature.

On Sunday, in Hagåtña, sunrise will be at 6:11 am and sunset at 6:00 pm (ChST).

In Hagåtña, tomorrow, there will be 11h and 49min of daylight.