Prosser, WA Weather & Growing Conditions
Tonight
52°F
Clear
Clear, with a low around 52. Southwest wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Clear | 2 mph SW | 0% |
| Saturday | 79°F | Sunny | 2 mph S | 0% |
| Saturday Night | 52°F | Mostly Clear | 2 mph E | 0% |
| Sunday | 81°F | Sunny | 2 mph NE | 0% |
| Sunday Night | 54°F | Clear | 2 mph NE | 0% |
| Monday | 82°F | Sunny | 2 mph SW | 0% |
| Monday Night | 54°F | Mostly Clear | 2 mph W | 0% |
| Tuesday | 77°F | Mostly Sunny | 2 mph SW | 0% |
| Tuesday Night | 51°F | Mostly Clear | 2 mph W | 0% |
| Wednesday | 73°F | Sunny | 2 mph S | 0% |
| Wednesday Night | 51°F | Partly Cloudy | 2 mph E | 0% |
| Thursday | 75°F | Mostly Sunny | 2 mph N | 3% |
| Thursday Night | 52°F | Slight Chance Rain Showers | 2 mph NW | 15% |
| Friday | 71°F | Mostly Sunny | 0 to 5 mph SW | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Prosser, WA
Last spring frost
Apr 14
First fall frost
Oct 22
Growing season
189 days
Hardiness zone
7b
Explore more for Prosser, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Prosser, Wa (4.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.