Prosser, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Prosser, a city in Benton County, Washington.
Today
82°F
Sunny
Sunny, with a high near 82. South wind around 3 mph.
7-day forecast for Prosser
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Sunny | 3 mph S | 0% |
| Tonight | 51°F | Mostly Clear | 2 mph SE | 0% |
| Sunday | 85°F | Sunny | 2 mph NE | 0% |
| Sunday Night | 52°F | Clear | 2 mph NE | 0% |
| Monday | 85°F | Sunny | 2 mph SW | 0% |
| Monday Night | 52°F | Partly Cloudy | 2 mph SW | 0% |
| Tuesday | 82°F | Sunny | 2 mph SW | 0% |
| Tuesday Night | 50°F | Partly Cloudy | 2 mph SW | 0% |
| Wednesday | 77°F | Mostly Sunny | 2 mph W | 0% |
| Wednesday Night | 49°F | Partly Cloudy | 2 mph W | 0% |
| Thursday | 74°F | Mostly Sunny | 2 mph N | 1% |
| Thursday Night | 49°F | Partly Cloudy | 2 mph N | 7% |
| Friday | 72°F | Mostly Sunny | 3 mph W | 7% |
| Friday Night | 46°F | Partly Cloudy | 3 mph W | 6% |
Forecast source: National Weather Service (api.weather.gov) for Prosser (46.209, -119.768). Updated through the day.
Growing snapshot for Prosser
Last spring frost
Apr 14
First fall frost
Oct 22
Growing season
189 days
Hardiness zone
7b
More local growing data for Prosser: nearby ZIP 99350 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Prosser, Wa (4.2 mi from Prosser). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.