Mattawa, WA Weather & Growing Conditions
Overnight
34°F
Patchy Fog
Patchy fog after 4am. Mostly clear. Low around 34, with temperatures rising to around 36 overnight. East wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 34°F | Patchy Fog | 1 mph E | 2% |
| Wednesday | 52°F | Patchy Fog then Sunny | 3 mph E | 9% |
| Wednesday Night | 39°F | Chance Rain Showers | 2 mph NE | 27% |
| Thursday | 59°F | Patchy Fog then Mostly Sunny | 1 to 5 mph SW | 1% |
| Thursday Night | 36°F | Partly Cloudy | 2 mph NW | 3% |
| Friday | 55°F | Mostly Cloudy | 3 mph E | 3% |
| Friday Night | 36°F | Mostly Cloudy | 2 mph N | 4% |
| Saturday | 57°F | Mostly Sunny | 1 to 5 mph NW | 1% |
| Saturday Night | 38°F | Mostly Cloudy | 1 to 5 mph W | 2% |
| Sunday | 61°F | Partly Sunny | 3 to 8 mph SW | 3% |
| Sunday Night | 36°F | Mostly Cloudy | 5 mph W | 2% |
| Monday | 56°F | Partly Sunny | 3 mph NW | 7% |
| Monday Night | 35°F | Slight Chance Rain Showers | 2 mph NW | 16% |
| Tuesday | 58°F | Slight Chance Rain Showers | 3 mph NE | 18% |
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 Nov 4, 2026.