Kelso, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Kelso, a city in Cowlitz County, Washington.
Tonight
40°F
Patchy Fog
Patchy fog after 10pm. Partly cloudy, with a low around 40. East wind around 2 mph.
7-day forecast for Kelso
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 40°F | Patchy Fog | 2 mph E | 5% |
| Wednesday | 57°F | Patchy Fog then Light Rain Likely | 2 to 8 mph SSE | 55% |
| Wednesday Night | 47°F | Light Rain | 2 to 8 mph SSE | 94% |
| Thursday | 57°F | Slight Chance Light Rain then Partly Sunny | 2 to 6 mph SSE | 22% |
| Thursday Night | 46°F | Light Rain Likely | 1 to 9 mph SSE | 74% |
| Friday | 56°F | Light Rain Likely | 5 to 13 mph SSE | 74% |
| Friday Night | 47°F | Chance Light Rain | 5 mph SSE | 34% |
| Saturday | 63°F | Mostly Cloudy then Chance Light Rain | 2 to 8 mph SSE | 30% |
| Saturday Night | 50°F | Light Rain Likely | 8 to 18 mph SSE | 70% |
| Sunday | 58°F | Light Rain Likely | 1 to 12 mph SSW | 68% |
| Sunday Night | 45°F | Slight Chance Light Rain then Areas Of Fog | 2 mph ESE | 22% |
| Monday | 57°F | Chance Light Rain | 2 to 8 mph SE | 47% |
| Monday Night | 47°F | Light Rain Likely | 6 to 15 mph SSE | 65% |
| Tuesday | 59°F | Light Rain Likely | 7 to 14 mph SSE | 65% |
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 Nov 4, 2026.