Weather forecast for tomorrowGuam, USA
Guam, USA - most visited locations
Weather forecast for tomorrow
Sunday Oct 18, 2026
- 82°F
- 79°F
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
- details ▼
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.
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.
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
- Precip. probability: 83%
- Precipitation: 0.08"
- Wind: 32mphNNE 14°
- Humidity: 91%
- Pressure: 29.47"Hg
- Visibility: 5mi
- UV index: 0
- details ▼
- 2 am
- 81°F
- Feels like:91°F
Heavy Rain / Wind
- Precip. probability: 100%
- Precipitation: 0.51"
- Wind: 47mphNNE 25°
- Humidity: 92%
- Pressure: 29.32"Hg
- Visibility: 2mi
- UV index: 0
- details ▼
- 4 am
- 81°F
- Feels like:91°F
Showers / Wind
- Precip. probability: 100%
- Precipitation: 0.16"
- Wind: 74mphNE 52°
- Humidity: 94%
- Pressure: 29.15"Hg
- Visibility: 1mi
- UV index: 0
- details ▼
- 6 am
- 81°F
- Feels like:91°F
Heavy Rain / Wind
- Precip. probability: 100%
- Precipitation: 0.39"
- Wind: 75mphE 93°
- Humidity: 95%
- Pressure: 28.94"Hg
- Visibility: 1mi
- UV index: 0
- details ▼
Sunrise: 6:11 am
- 8 am
- 81°F
- Feels like:91°F
Heavy Rain / Wind
- Precip. probability: 97%
- Precipitation: 0.47"
- Wind: 56mphESE 119°
- Humidity: 93%
- Pressure: 29.03"Hg
- Visibility: 1mi
- UV index: 1
- details ▼
- 10 am
- 81°F
- Feels like:91°F
Heavy Rain / Wind
- Precip. probability: 100%
- Precipitation: 0.39"
- Wind: 48mphSE 128°
- Humidity: 96%
- Pressure: 29.23"Hg
- Visibility: 1mi
- UV index: 4
- details ▼
- 12 pm
- 81°F
- Feels like:91°F
Rain / Wind
- Precip. probability: 98%
- Precipitation: 0.31"
- Wind: 42mphSE 141°
- Humidity: 96%
- Pressure: 29.35"Hg
- Visibility: 1mi
- UV index: 6
- details ▼
- 2 pm
- 81°F
- Feels like:90°F
Rain / Wind
- Precip. probability: 94%
- Precipitation: 0.31"
- Wind: 39mphSSE 147°
- Humidity: 95%
- Pressure: 29.41"Hg
- Visibility: 2mi
- UV index: 4
- details ▼
- 4 pm
- 81°F
- Feels like:91°F
Rain / Wind
- Precip. probability: 95%
- Precipitation: 0.2"
- Wind: 34mphSSE 148°
- Humidity: 93%
- Pressure: 29.47"Hg
- Visibility: 2mi
- UV index: 1
- details ▼
- 6 pm
- 81°F
- Feels like:90°F
Rain / Wind
- Precip. probability: 93%
- Precipitation: 0.16"
- Wind: 31mphSSE 148°
- Humidity: 91%
- Pressure: 29.56"Hg
- Visibility: 2mi
- UV index: 0
- details ▼
Sunset: 6:00 pm
- 8 pm
- 81°F
- Feels like:90°F
Rain / Wind
- Precip. probability: 100%
- Precipitation: 0.24"
- Wind: 29mphSE 145°
- Humidity: 91%
- Pressure: 29.62"Hg
- Visibility: 2mi
- UV index: 0
- details ▼
- 10 pm
- 81°F
- Feels like:88°F
Showers / Wind
- Precip. probability: 77%
- Precipitation: 0.12"
- Wind: 25mphSE 144°
- Humidity: 93%
- Pressure: 29.68"Hg
- Visibility: 2mi
- UV index: 0
- details ▼
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.
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
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.
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.





