Weather forecast for tomorrowGrand Coulee, WA
Weather forecast for tomorrow
Sunday Oct 18, 2026
- 66°F
- 41°F
Mostly Sunny
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 4mphNE 55°
- Humidity: 43%
- UV index: 3
- Sunrise: 7:20 am PDT
- Sunset: 6:02 pm PDT
- details ▼
Tomorrow, a pleasant, mostly sunny outlook is in place.
The temperature scale will run from a maximum of an enjoyable 66.2°F to a minimum of a cold 41°F.
Temperatures are trending warmer, with a peak resembling September's average maximum rather than October's seasonal high.
Sunrise will be at 7:20 am and sunset at 6:02 pm; tomorrow's daylight will last for 10h and 42min.
The temperature scale will run from a maximum of an enjoyable 66.2°F to a minimum of a cold 41°F.
Temperatures are trending warmer, with a peak resembling September's average maximum rather than October's seasonal high.
Sunrise will be at 7:20 am and sunset at 6:02 pm; tomorrow's daylight will last for 10h and 42min.
Hourly overview
Hourly temperatures
Warmest hour: 3 pm 64°C.
Coldest hour: 6 am 36°C.
Coldest hour: 6 am 36°C.
Chance of precipitation
Highest chance: 6 am 3%.
Hourly weather forecast
- 12 am
- 45°F
- Feels like:41°F
Clear
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 6mphNW 307°
- Humidity: 53%
- Pressure: 30.12"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 2 am
- 39°F
- Feels like:36°F
Clear
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 5mphNW 320°
- Humidity: 64%
- Pressure: 30.12"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 4 am
- 37°F
- Feels like:32°F
Clear
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 5mphNNW 329°
- Humidity: 71%
- Pressure: 30.15"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 6 am
- 36°F
- Feels like:32°F
Clear
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 4mphNNW 343°
- Humidity: 76%
- Pressure: 30.15"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunrise: 7:20 am
- 8 am
- 36°F
- Feels like:36°F
Sunny
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 3mphN 352°
- Humidity: 81%
- Pressure: 30.18"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 am
- 48°F
- Feels like:48°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 2mphN 11°
- Humidity: 51%
- Pressure: 30.18"Hg
- Visibility: 10mi
- UV index: 1
- details ▼
- 12 pm
- 57°F
- Feels like:57°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 3mphNNE 24°
- Humidity: 36%
- Pressure: 30.12"Hg
- Visibility: 10mi
- UV index: 3
- details ▼
- 2 pm
- 63°F
- Feels like:63°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 2mphESE 118°
- Humidity: 26%
- Pressure: 30.06"Hg
- Visibility: 10mi
- UV index: 2
- details ▼
- 4 pm
- 64°F
- Feels like:64°F
Mostly Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 4mphESE 110°
- Humidity: 23%
- Pressure: 30"Hg
- Visibility: 10mi
- UV index: 1
- details ▼
- 6 pm
- 61°F
- Feels like:61°F
Partly Cloudy
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 3mphESE 108°
- Humidity: 29%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunset: 6:02 pm
- 8 pm
- 52°F
- Feels like:50°F
Partly Cloudy
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 4mphN 2°
- Humidity: 43%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 pm
- 46°F
- Feels like:46°F
Mostly Cloudy
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 4mphN 359°
- Humidity: 54%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Tomorrow, on Sunday, a combination of bright and cloudy weather is forecasted.
The temperature will vary between a minimum of 33.8°F and a maximum of 64.4°F. The warmest part of the day will be from 3 pm to 5 pm.
Tomorrow, temperatures will be more close to the climate of September than the usual maximum in October. The night temperature will be close to the standard October low of 41.4°F.
The temperature will vary between a minimum of 33.8°F and a maximum of 64.4°F. The warmest part of the day will be from 3 pm to 5 pm.
Tomorrow, temperatures will be more close to the climate of September than the usual maximum in October. The night temperature will be close to the standard October low of 41.4°F.
Updated: Oct 18, 2026 @ 04:36:07 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
Tomorrow, a crisp, sunny atmosphere is likely.
Tomorrow, the maximum temperature will be 66.2°F, while the minimum temperature will be 41°F.
The highest temperature tomorrow will be noticeably higher than the average maximum of 56.3°F in October. The lowest temperature tomorrow will be in line with the average low temperature.
The highest temperature tomorrow will be noticeably higher than the average maximum of 56.3°F in October. The lowest temperature tomorrow will be in line with the average low temperature.
On Sunday, in Grand Coulee, sunrise will be at 7:20 am and sunset at 6:02 pm (PDT).
In Grand Coulee, the length of the day tomorrow will be 10h and 42min.
