Weather forecast for tomorrowGuam, USA

Weather forecast for tomorrow

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.

Hourly overview

Hourly temperatures

Warmest hour: 12 am 93°C.
Coldest period: 6 pm - 9 pm 90°C.

Chance of precipitation

Highest chance: 100%.

Hourly weather forecast

  • 12 am
  • 82°F
  • Feels like:
    93°F
Rain / Wind
Rain / Wind
  • Precip. probability: 83%
  • Precipitation: 0.08"
  • Wind: 32mphNNE 14°
  • Humidity: 91%
  • Pressure: 29.47"Hg
  • Visibility: 5mi
  • UV index: 0
  • ▼
  • 2 am
  • 81°F
  • Feels like:
    91°F
Heavy Rain / Wind
Heavy Rain / Wind
  • Precip. probability: 100%
  • Precipitation: 0.51"
  • Wind: 47mphNNE 25°
  • Humidity: 92%
  • Pressure: 29.32"Hg
  • Visibility: 2mi
  • UV index: 0
  • ▼
  • 4 am
  • 81°F
  • Feels like:
    91°F
Showers / Wind
Showers / Wind
  • Precip. probability: 100%
  • Precipitation: 0.16"
  • Wind: 74mphNE 52°
  • Humidity: 94%
  • Pressure: 29.15"Hg
  • Visibility: 1mi
  • UV index: 0
  • ▼
  • 6 am
  • 81°F
  • Feels like:
    91°F
Heavy Rain / Wind
Heavy Rain / Wind
  • Precip. probability: 100%
  • Precipitation: 0.39"
  • Wind: 75mphE 93°
  • Humidity: 95%
  • Pressure: 28.94"Hg
  • Visibility: 1mi
  • UV index: 0
  • ▼
Sunrise: 6:11 am
  • 8 am
  • 81°F
  • Feels like:
    91°F
Heavy Rain / Wind
Heavy Rain / Wind
  • Precip. probability: 97%
  • Precipitation: 0.47"
  • Wind: 56mphESE 119°
  • Humidity: 93%
  • Pressure: 29.03"Hg
  • Visibility: 1mi
  • UV index: 1
  • ▼
  • 10 am
  • 81°F
  • Feels like:
    91°F
Heavy Rain / Wind
Heavy Rain / Wind
  • Precip. probability: 100%
  • Precipitation: 0.39"
  • Wind: 48mphSE 128°
  • Humidity: 96%
  • Pressure: 29.23"Hg
  • Visibility: 1mi
  • UV index: 4
  • ▼
  • 12 pm
  • 81°F
  • Feels like:
    91°F
Rain / Wind
Rain / Wind
  • Precip. probability: 98%
  • Precipitation: 0.31"
  • Wind: 42mphSE 141°
  • Humidity: 96%
  • Pressure: 29.35"Hg
  • Visibility: 1mi
  • UV index: 6
  • ▼
  • 2 pm
  • 81°F
  • Feels like:
    90°F
Rain / Wind
Rain / Wind
  • Precip. probability: 94%
  • Precipitation: 0.31"
  • Wind: 39mphSSE 147°
  • Humidity: 95%
  • Pressure: 29.41"Hg
  • Visibility: 2mi
  • UV index: 4
  • ▼
  • 4 pm
  • 81°F
  • Feels like:
    91°F
Rain / Wind
Rain / Wind
  • Precip. probability: 95%
  • Precipitation: 0.2"
  • Wind: 34mphSSE 148°
  • Humidity: 93%
  • Pressure: 29.47"Hg
  • Visibility: 2mi
  • UV index: 1
  • ▼
  • 6 pm
  • 81°F
  • Feels like:
    90°F
Rain / Wind
Rain / Wind
  • Precip. probability: 93%
  • Precipitation: 0.16"
  • Wind: 31mphSSE 148°
  • Humidity: 91%
  • Pressure: 29.56"Hg
  • Visibility: 2mi
  • UV index: 0
  • ▼
Sunset: 6:00 pm
  • 8 pm
  • 81°F
  • Feels like:
    90°F
Rain / Wind
Rain / Wind
  • Precip. probability: 100%
  • Precipitation: 0.24"
  • Wind: 29mphSE 145°
  • Humidity: 91%
  • Pressure: 29.62"Hg
  • Visibility: 2mi
  • UV index: 0
  • ▼
  • 10 pm
  • 81°F
  • Feels like:
    88°F
Showers / Wind
Showers / Wind
  • Precip. probability: 77%
  • Precipitation: 0.12"
  • Wind: 25mphSE 144°
  • Humidity: 93%
  • Pressure: 29.68"Hg
  • Visibility: 2mi
  • UV index: 0
  • ▼
Tomorrow, on Sunday, rainfall is expected.
Rainfall is forecasted throughout the entire day, with precipitation varying from a minimal 0.08" to a maximum of 0.55". With intense precipitation of 0.55", most rainfall is expected at 5 am.
The temperature difference will be indistinguishable, with the lowest temperature of 80.6°F and the highest temperature of 82.4°F. The feels-like temperature variation will be unnoticeable, with the lowest temperature of 87.8°F and the highest temperature of 93.2°F.
Tomorrow, expect conditions similar to October's usual high temperature. The minimum temperature will be also moderately lower than October's average low of 82.6°F.
Updated: Oct 17, 2026 @ 12:08:29 UTC
Published by: Weather U.S. | 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.