Kelso, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Kelso, a city in Cowlitz County, Washington.
Today
77°F
Patchy Fog then Partly Sunny
Patchy fog before 9am. Partly sunny, with a high near 77. Northwest wind 1 to 5 mph.
7-day forecast for Kelso
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 77°F | Patchy Fog then Partly Sunny | 1 to 5 mph NW | 0% |
| Tonight | 50°F | Mostly Clear | 5 mph NW | 0% |
| Sunday | 78°F | Mostly Sunny | 3 to 7 mph NNW | 0% |
| Sunday Night | 51°F | Mostly Clear | 3 to 7 mph NNW | 0% |
| Monday | 75°F | Mostly Sunny | 3 to 8 mph NNW | 0% |
| Monday Night | 52°F | Partly Cloudy | 2 to 8 mph NW | 0% |
| Tuesday | 72°F | Partly Sunny | 2 to 8 mph NW | 0% |
| Tuesday Night | 49°F | Partly Cloudy then Patchy Fog | 0 to 8 mph NW | 1% |
| Wednesday | 70°F | Patchy Fog then Partly Sunny | 0 to 6 mph NNW | 1% |
| Wednesday Night | 50°F | Mostly Cloudy | 2 to 6 mph NNW | 1% |
| Thursday | 68°F | Mostly Cloudy | 2 to 8 mph NNW | 13% |
| Thursday Night | 50°F | Mostly Cloudy | 5 to 8 mph NNW | 13% |
| Friday | 67°F | Partly Sunny | 5 to 8 mph NNW | 11% |
| Friday Night | 48°F | Partly Cloudy | 3 to 8 mph NNW | 7% |
Forecast source: National Weather Service (api.weather.gov) for Kelso (46.117, -122.886). Updated through the day.
Growing snapshot for Kelso
Last spring frost
Apr 8
First fall frost
Nov 5
Growing season
210 days
Hardiness zone
8b
More local growing data for Kelso: nearby ZIP 98609 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Longview, Wa (6 mi from Kelso). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.