Home / Local Weather & Traffic / Washington / Mattawa / Weather Forecast

Mattawa, WA Weather Tomorrow

Explore tomorrow's Mattawa weather before planning your week with a detailed 5 day forecast featuring precipitation chances, day and night conditions, high and low temperatures in Fahrenheit and Celsius, sunrise, sunset, sky conditions, wind chill, and wind speed with direction for the Mattawa area and around Grant county, Washington.
Updated: Sat Aug 29th 2026 5:30 AM PDT
Mattawa, WA Weather – 8-29 – Sunny
71° / 57°
Sunny
Bright and sunny conditions in Mattawa, with a high of 71°F and a low of 57°F. There's a very small chance of rainfall, only about 2%. Winds will be strong at speeds peaking at 25mph and gusts of 37.2mph at 9 PM. Humidity levels should be comfortable, sitting around 41% on average, the maximum being 58% at 7 AM and 21% being its lowest at 3 PM. Barometric pressure is its highest of 29.91inHg at 9 PM, a lowest point of 29.85inHg at 4 PM with an avg 29.88inHg.
Mattawa, WA Weather – 8-30 – Sunny
76° / 52°

Weather Tomorrow

Sunny
Bright and sunny conditions in Mattawa, with a high of 76°F and a low of 52°F. There's a very small chance of rainfall, only about 2%. Winds will be strong at speeds peaking at 24mph and gusts of 35.6mph at 8 PM. Humidity levels should be comfortable, sitting around 46% on average, the maximum being 67% at 6 AM and 27% being its lowest at 2 PM. Barometric pressure is its highest of 29.98inHg at 7 AM, a lowest point of 29.84inHg at 5 PM with an avg 29.91inHg.
Mattawa, WA Weather – 8-31 – Smoky Haze
80° / 55°
Smoky Haze
Highs will reach 80°F with lows near 55°F in Mattawa, where smoky Haze is. There's a very small chance of rainfall, only about 4%. Wind will be moderate, blowing around 13mph on average and gusts of 26.2mph at 12 AM. Humidity levels should be comfortable, sitting around 47% on average, the maximum being 72% at 6 AM and 24% being its lowest at 5 PM. Barometric pressure is its highest of 29.94inHg at 7 AM, a lowest point of 29.71inHg at 6 PM with an avg 29.84inHg.
Mattawa, WA Weather – 9-1 – Smoky Haze
86° / 64°
Smoky Haze
In Mattawa, smoky Haze is likely with a high near 86°F and a low around 64°F. There's a very small chance of rainfall, only about 7% with an estimated 0in. Winds will be strong at speeds peaking at 22mph and gusts of 34.8mph at 9 PM. Humidity levels should be comfortable, sitting around 38% on average, the maximum being 51% at 6 AM and 16% being its lowest at 5 PM. Barometric pressure is its highest of 29.75inHg at 12 AM, a lowest point of 29.55inHg at 5 PM with an avg 29.68inHg.
Mattawa, WA Weather – 9-2 – Overcast
66° / 54°
Overcast
Mattawa is set for cloud-filled skies with temperatures peaking at 66°F and dipping to 54°F. There might be light rainfall having a 17% chance with an estimated 0in. Winds will be strong at speeds peaking at 24mph and gusts of 30mph at 1 AM. Humidity levels should be comfortable, sitting around 56% on average, the maximum being 74% at 6 AM and 39% being its lowest at 11 AM. Barometric pressure is its highest of 29.85inHg at 11 PM, a lowest point of 29.68inHg at 12 AM with an avg 29.78inHg.
Mattawa, WA Weather – 9-3 – Overcast
65° / 52°
Overcast
Daytime highs will reach 65°F with lows dropping to 52°F in Mattawa, where it will be overcast. There might be light rainfall having a 11% chance with an estimated 0in. Wind will be moderate, blowing around 11mph on average and gusts of 17.7mph at 2 PM. Humidity levels should be comfortable, sitting around 57% on average, the maximum being 76% at 2 AM and 34% being its lowest at 5 PM. Barometric pressure is its highest of 29.91inHg at 11 PM, a lowest point of 29.84inHg at 12 AM with an avg 29.86inHg.

Currently

Clear 58°F
29.85 inHg.
Barometer
52%
Humidity
WSW 16.6 mph
Wind
Clear

5 Day Forecast Nearby

More Local Information

Bookmark and Share

Get the LocalConditions.com App on Google Play
Sign up for a membership to go Ad free

Mattawa Community Weather Reports

Write your own Mattawa, WA report, forecast, or traffic update:


Will not be posted, shared or used for marketing!

Please note by clicking on "Post" you acknowledge that you have read our Privacy Policy and Terms of Service and the Mattawa, WA report and/or forecast you are posting is in compliance with such terms. If you are under 18, do not submit this form. Be respectful! Inappropriate content will be removed by a moderator.