Mattawa, WA Weather & Growing Conditions
Today
90°F
Areas Of Smoke then Haze
Areas of smoke before 10am, then haze and areas of smoke. Sunny, with a high near 90. Northeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Areas Of Smoke then Haze | 5 mph NE | 0% |
| Tonight | 60°F | Areas Of Smoke | 3 mph N | 0% |
| Wednesday | 94°F | Areas Of Smoke | 3 mph E | 0% |
| Wednesday Night | 62°F | Patchy Smoke then Clear | 2 mph W | 0% |
| Thursday | 99°F | Sunny | 5 mph SW | 0% |
| Thursday Night | 66°F | Clear | 3 to 7 mph W | 0% |
| Friday | 99°F | Sunny | 5 to 12 mph W | 0% |
| Friday Night | 65°F | Clear | 7 to 15 mph W | 0% |
| Saturday | 95°F | Sunny | 6 to 10 mph W | 0% |
| Saturday Night | 63°F | Mostly Clear | 9 to 15 mph W | 0% |
| Sunday | 90°F | Sunny | 5 to 9 mph W | 0% |
| Sunday Night | 60°F | Mostly Clear | 7 to 13 mph W | 0% |
| Monday | 89°F | Sunny | 3 to 7 mph W | 0% |
| Monday Night | 60°F | Mostly Clear | 5 to 12 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mattawa, WA
Last spring frost
Apr 23
First fall frost
Oct 12
Growing season
172 days
Hardiness zone
7a
Explore more for Mattawa, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Smyrna, Wa (7.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.