Kennewick, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Kennewick, a city in Benton County, Washington.
Tonight
38°F
Partly Cloudy
Partly cloudy, with a low around 38. Southwest wind around 5 mph.
7-day forecast for Kennewick
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 38°F | Partly Cloudy | 5 mph SW | 2% |
| Wednesday | 53°F | Sunny | 3 mph S | 2% |
| Wednesday Night | 43°F | Chance Rain Showers | 2 to 9 mph S | 31% |
| Thursday | 58°F | Mostly Sunny | 5 to 9 mph SW | 10% |
| Thursday Night | 42°F | Partly Cloudy | 2 to 6 mph S | 9% |
| Friday | 56°F | Mostly Cloudy | 2 to 6 mph S | 9% |
| Friday Night | 43°F | Mostly Cloudy | 1 to 5 mph SW | 4% |
| Saturday | 57°F | Partly Sunny | 1 to 5 mph NW | 0% |
| Saturday Night | 44°F | Mostly Cloudy | 2 to 9 mph SW | 9% |
| Sunday | 60°F | Partly Sunny | 6 to 12 mph SW | 12% |
| Sunday Night | 43°F | Mostly Cloudy | 6 mph W | 8% |
| Monday | 55°F | Mostly Cloudy | 3 mph W | 9% |
| Monday Night | 43°F | Mostly Cloudy then Slight Chance Rain Showers | 3 mph SW | 24% |
| Tuesday | 59°F | Slight Chance Rain Showers | 3 mph SW | 24% |
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 Nov 4, 2026.