Hartline, WA Weather & Growing Conditions
Tonight
51°F
Mostly Clear
Mostly clear, with a low around 51. North wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Mostly Clear | 3 mph N | 0% |
| Saturday | 79°F | Mostly Sunny | 3 to 7 mph SE | 0% |
| Saturday Night | 51°F | Mostly Clear | 2 to 6 mph SE | 0% |
| Sunday | 81°F | Sunny | 6 mph SE | 0% |
| Sunday Night | 52°F | Mostly Clear | 3 to 7 mph E | 0% |
| Monday | 81°F | Sunny | 5 to 8 mph S | 0% |
| Monday Night | 53°F | Partly Cloudy | 3 to 8 mph NW | 0% |
| Tuesday | 77°F | Mostly Sunny | 3 to 8 mph N | 0% |
| Tuesday Night | 50°F | Partly Cloudy | 3 to 8 mph W | 0% |
| Wednesday | 72°F | Partly Sunny | 5 to 10 mph SW | 1% |
| Wednesday Night | 49°F | Mostly Cloudy | 5 to 10 mph W | 1% |
| Thursday | 71°F | Partly Sunny | 6 mph NW | 4% |
| Thursday Night | 48°F | Mostly Cloudy | 7 mph NW | 8% |
| Friday | 67°F | Partly Sunny | 7 to 10 mph NW | 8% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Hartline, WA
Last spring frost
May 2
First fall frost
Oct 12
Growing season
162 days
Hardiness zone
6b
Explore more for Hartline, WA: full frost dates · planting calendar · Washington frost dates
Climate data from the nearest NOAA station, Hartline, Wa (2.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.