Harlem, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harlem, a city in Blaine County, Montana.
Today
78°F
Sunny
Sunny, with a high near 78. West northwest wind 9 to 13 mph, with gusts as high as 22 mph.
7-day forecast for Harlem
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Sunny | 9 to 13 mph WNW | 1% |
| Tonight | 48°F | Mostly Clear | 2 to 12 mph W | 1% |
| Wednesday | 86°F | Mostly Sunny | 2 to 15 mph WNW | 0% |
| Wednesday Night | 51°F | Partly Cloudy | 2 to 14 mph N | 0% |
| Thursday | 93°F | Sunny | 3 to 15 mph NNW | 0% |
| Thursday Night | 53°F | Mostly Clear | 6 to 15 mph NNE | 0% |
| Friday | 94°F | Sunny | 6 to 14 mph ESE | 0% |
| Friday Night | 54°F | Mostly Clear | 14 mph NE | 0% |
| Saturday | 91°F | Sunny | 14 mph ENE | 0% |
| Saturday Night | 55°F | Partly Cloudy | 13 mph NE | 1% |
| Sunday | 89°F | Mostly Sunny | 14 mph NE | 2% |
| Sunday Night | 54°F | Partly Cloudy | 13 to 16 mph NE | 14% |
| Monday | 86°F | Mostly Sunny | 13 mph ENE | 14% |
| Monday Night | 54°F | Partly Cloudy then Chance Rain Showers | 13 to 16 mph ENE | 25% |
Forecast source: National Weather Service (api.weather.gov) for Harlem (48.532, -108.785). Updated through the day.
Growing snapshot for Harlem
Last spring frost
May 16
First fall frost
Sep 22
Growing season
128 days
Hardiness zone
4a
More local growing data for Harlem: nearby ZIP 59526 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Ft Belknap 2 Sw, Mt (3.6 mi from Harlem). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.