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Kennewick, WA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Kennewick, a city in Benton County, Washington.

Overnight
56°F
Mostly Clear
Mostly clear, with a low around 56. South wind around 3 mph.

7-day forecast for Kennewick

WhenTempForecastWindPrecip
Overnight 56°F Mostly Clear 3 mph S 0%
Saturday 81°F Sunny 3 mph SE 0%
Saturday Night 57°F Mostly Clear 2 mph S 0%
Sunday 83°F Sunny 0 to 3 mph N 0%
Sunday Night 58°F Mostly Clear 2 mph NW 0%
Monday 84°F Sunny 2 mph SW 0%
Monday Night 58°F Partly Cloudy 3 mph SW 0%
Tuesday 81°F Sunny 3 mph SW 0%
Tuesday Night 56°F Mostly Clear 6 mph SW 0%
Wednesday 77°F Mostly Sunny 5 mph SW 0%
Wednesday Night 55°F Partly Cloudy 5 mph SW 0%
Thursday 74°F Mostly Sunny 5 mph W 1%
Thursday Night 54°F Partly Cloudy 5 mph W 5%
Friday 72°F Mostly Sunny 3 to 7 mph SW 9%

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

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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 19, 2026.