Grand Mound, WA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grand Mound, a community in Lewis County, Washington.
Today
92°F
Sunny then Smoke
Smoke after 1pm. Sunny, with a high near 92. North northeast wind around 8 mph.
7-day forecast for Grand Mound
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 92°F | Sunny then Smoke | 8 mph NNE | 0% |
| Tonight | 59°F | Smoke | 2 to 6 mph NNE | 0% |
| Wednesday | 96°F | Areas Of Smoke | 2 to 6 mph NNE | 0% |
| Wednesday Night | 57°F | Mostly Clear | 0 to 5 mph NW | 0% |
| Thursday | 94°F | Sunny | 0 to 6 mph NW | 0% |
| Thursday Night | 56°F | Mostly Clear | 2 to 6 mph WSW | 0% |
| Friday | 89°F | Sunny | 2 to 8 mph WSW | 0% |
| Friday Night | 54°F | Mostly Clear | 1 to 8 mph W | 0% |
| Saturday | 82°F | Sunny | 1 to 10 mph W | 0% |
| Saturday Night | 52°F | Mostly Clear | 2 to 10 mph WSW | 0% |
| Sunday | 78°F | Mostly Sunny | 2 to 9 mph W | 0% |
| Sunday Night | 52°F | Partly Cloudy | 2 to 9 mph W | 0% |
| Monday | 79°F | Mostly Sunny | 1 to 8 mph WNW | 0% |
| Monday Night | 52°F | Partly Cloudy | 1 to 8 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Grand Mound (46.800, -123.011). Updated through the day.
Growing snapshot for Grand Mound
Last spring frost
Apr 22
First fall frost
Oct 27
Growing season
188 days
Hardiness zone
8b
More local growing data for Grand Mound: nearby ZIP 98544 weather · frost dates · planting calendar · Washington frost dates
Nearby towns & communities
Ashford
Centralia
Chehalis
Fords Prairie
Morton
Mossyrock
Napavine
Onalaska
Packwood
Pe Ell
Toledo
Vader
Winlock
Climate data from the nearest NOAA station, Centralia, Wa (3.8 mi from Grand Mound). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.