Kennewick, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Kennewick, a city in Benton County, Washington.
Tonight
58°F
Mostly Clear
Mostly clear, with a low around 58. South wind 0 to 3 mph.
7-day forecast for Kennewick
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Mostly Clear | 0 to 3 mph S | 0% |
| Sunday | 84°F | Sunny | 0 to 3 mph N | 0% |
| Sunday Night | 59°F | Mostly Clear | 2 mph NW | 0% |
| Monday | 85°F | Sunny | 3 mph W | 0% |
| Monday Night | 60°F | Partly Cloudy | 5 mph SW | 0% |
| Tuesday | 82°F | Mostly Sunny | 5 mph SW | 0% |
| Tuesday Night | 56°F | Partly Cloudy | 7 mph SW | 0% |
| Wednesday | 77°F | Mostly Sunny | 7 mph SW | 0% |
| Wednesday Night | 54°F | Partly Cloudy | 5 mph SW | 1% |
| Thursday | 74°F | Mostly Sunny | 5 mph NW | 3% |
| Thursday Night | 55°F | Partly Cloudy | 5 mph NW | 5% |
| Friday | 72°F | Mostly Sunny | 3 to 7 mph W | 6% |
| Friday Night | 52°F | Mostly Cloudy | 7 mph W | 6% |
| Saturday | 70°F | Mostly Sunny | 6 mph SW | 6% |
Forecast source: National Weather Service (api.weather.gov) for Kennewick (46.198, -119.176). Updated through the day.
Growing snapshot for Kennewick
Last spring frost
Mar 28
First fall frost
Oct 30
Growing season
216 days
Hardiness zone
7b
More local growing data for Kennewick: nearby ZIP 99336 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Kennewick, Wa (3.6 mi from Kennewick). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.