Mattawa, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mattawa, a city in Kittitas County, Washington.
Overnight
35°F
Patchy Fog
Patchy fog after 5am. Mostly clear, with a low around 35. Wind around 0 mph.
7-day forecast for Mattawa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 35°F | Patchy Fog | 0 mph | 1% |
| Wednesday | 53°F | Patchy Fog | 0 to 5 mph E | 12% |
| Wednesday Night | 38°F | Chance Rain Showers | 2 mph E | 25% |
| Thursday | 60°F | Patchy Fog then Sunny | 1 to 7 mph W | 1% |
| Thursday Night | 37°F | Partly Cloudy | 0 to 3 mph NW | 4% |
| Friday | 55°F | Mostly Cloudy | 0 to 5 mph NE | 4% |
| Friday Night | 37°F | Mostly Cloudy | 3 mph NW | 5% |
| Saturday | 57°F | Mostly Sunny | 1 to 5 mph N | 1% |
| Saturday Night | 39°F | Mostly Cloudy | 3 mph W | 3% |
| Sunday | 60°F | Partly Sunny | 3 to 9 mph SW | 3% |
| Sunday Night | 37°F | Mostly Cloudy | 1 to 5 mph W | 2% |
| Monday | 56°F | Partly Sunny | 3 mph N | 8% |
| Monday Night | 36°F | Slight Chance Rain Showers | 2 mph NW | 16% |
| Tuesday | 58°F | Slight Chance Rain Showers | 0 to 3 mph NE | 17% |
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 Nov 4, 2026.