Harlowton, MT Weather & Growing Conditions
Tonight
51°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy. Low around 51, with temperatures rising to around 53 overnight. North northwest wind around 8 mph. Chance of precipitation is 100%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Showers And Thunderstorms | 8 mph NNW | 97% |
| Saturday | 58°F | Showers And Thunderstorms | 9 to 13 mph NNW | 95% |
| Saturday Night | 47°F | Rain Showers | 8 mph NNW | 78% |
| Sunday | 65°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 to 8 mph NNW | 45% |
| Sunday Night | 45°F | Mostly Cloudy | 5 to 8 mph SSE | 8% |
| Monday | 73°F | Mostly Sunny | 7 mph SSW | 0% |
| Monday Night | 47°F | Mostly Clear | 3 to 10 mph SW | 0% |
| Tuesday | 77°F | Sunny | 3 to 10 mph WSW | 0% |
| Tuesday Night | 48°F | Partly Cloudy | 6 mph SW | 3% |
| Wednesday | 76°F | Sunny | 3 to 9 mph W | 1% |
| Wednesday Night | 48°F | Mostly Clear | 5 to 8 mph WSW | 1% |
| Thursday | 77°F | Sunny | 3 to 8 mph SW | 0% |
| Thursday Night | 48°F | Mostly Clear | 3 to 9 mph SSE | 3% |
| Friday | 77°F | Mostly Sunny | 7 mph SW | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Harlowton, MT
Last spring frost
May 23
First fall frost
Sep 16
Growing season
113 days
Hardiness zone
4b
Explore more for Harlowton, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Harlowton, Mt (2.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.