Prosser, WA Weather & Growing Conditions
Today
50°F
Patchy Fog
Patchy fog before 1pm. Sunny. High near 50, with temperatures falling to around 46 in the afternoon. South wind 0 to 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 50°F | Patchy Fog | 0 to 3 mph S | 2% |
| Tonight | 39°F | Chance Rain Showers | 2 to 6 mph SW | 51% |
| Thursday | 56°F | Patchy Fog then Mostly Sunny | 5 mph SW | 7% |
| Thursday Night | 37°F | Partly Cloudy | 0 to 3 mph SW | 4% |
| Friday | 53°F | Mostly Cloudy | 0 to 3 mph S | 7% |
| Friday Night | 38°F | Mostly Cloudy | 2 mph SE | 7% |
| Saturday | 56°F | Mostly Sunny | 0 to 3 mph NE | 1% |
| Saturday Night | 40°F | Mostly Cloudy | 1 to 5 mph W | 2% |
| Sunday | 57°F | Partly Sunny | 3 to 8 mph SW | 2% |
| Sunday Night | 39°F | Mostly Cloudy | 0 to 3 mph W | 1% |
| Monday | 53°F | Partly Sunny | 2 mph N | 6% |
| Monday Night | 38°F | Mostly Cloudy then Slight Chance Rain Showers | 1 mph S | 18% |
| Tuesday | 56°F | Slight Chance Rain Showers | 2 mph S | 18% |
| Tuesday Night | 40°F | Slight Chance Rain Showers | 2 mph N | 19% |
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 Nov 4, 2026.