Harlowton, MT Weather & Growing Conditions
This Afternoon
75°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. High near 75, with temperatures falling to around 71 in the afternoon. North northeast wind around 13 mph. Chance of precipitation is 40%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Chance Showers And Thunderstorms | 13 mph NNE | 44% |
| Tonight | 51°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 7 to 12 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% |
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.