Mattawa, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mattawa, a city in Kittitas County, Washington.
Overnight
58°F
Areas Of Smoke
Areas of smoke. Clear. Low around 58, with temperatures rising to around 61 overnight. North wind around 3 mph.
7-day forecast for Mattawa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Areas Of Smoke | 3 mph N | 0% |
| Tuesday | 90°F | Smoke then Haze | 6 mph NE | 0% |
| Tuesday Night | 61°F | Areas Of Smoke | 3 mph NE | 0% |
| Wednesday | 95°F | Areas Of Smoke | 2 to 6 mph E | 0% |
| Wednesday Night | 64°F | Patchy Smoke then Clear | 5 mph SW | 0% |
| Thursday | 100°F | Sunny | 2 to 7 mph SW | 0% |
| Thursday Night | 67°F | Clear | 3 to 8 mph W | 0% |
| Friday | 99°F | Sunny | 7 to 15 mph W | 0% |
| Friday Night | 65°F | Clear | 8 to 15 mph W | 0% |
| Saturday | 95°F | Sunny | 8 to 14 mph W | 0% |
| Saturday Night | 63°F | Mostly Clear | 14 mph NW | 0% |
| Sunday | 91°F | Sunny | 6 to 12 mph NW | 0% |
| Sunday Night | 61°F | Mostly Clear | 9 to 13 mph W | 0% |
| Monday | 90°F | Sunny | 5 to 9 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Mattawa (46.736, -119.905). Updated through the day.
Growing snapshot for Mattawa
Last spring frost
Mar 24
First fall frost
Nov 4
Growing season
222 days
Hardiness zone
7a
More local growing data for Mattawa: nearby ZIP 98950 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Priest Rapids Dam, Wa (12.1 mi from Mattawa). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.