Jefferson City, MT Weather & Growing Conditions
This Afternoon
65°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely. Cloudy. High near 65, with temperatures falling to around 61 in the afternoon. North wind around 7 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 65°F | Showers And Thunderstorms Likely | 7 mph N | 67% |
| Tonight | 49°F | Showers And Thunderstorms | 5 to 9 mph N | 98% |
| Saturday | 53°F | Showers And Thunderstorms | 6 to 10 mph N | 96% |
| Saturday Night | 46°F | Chance Light Rain | 5 mph S | 46% |
| Sunday | 64°F | Mostly Sunny | 6 mph W | 3% |
| Sunday Night | 46°F | Mostly Clear | 6 mph S | 0% |
| Monday | 69°F | Sunny | 3 to 7 mph SW | 0% |
| Monday Night | 48°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 69°F | Sunny | 6 mph SW | 1% |
| Tuesday Night | 49°F | Partly Cloudy | 2 to 6 mph WSW | 3% |
| Wednesday | 70°F | Sunny | 5 to 8 mph SSW | 3% |
| Wednesday Night | 50°F | Mostly Clear | 3 to 7 mph SW | 3% |
| Thursday | 71°F | Sunny | 8 mph S | 2% |
| Thursday Night | 51°F | Mostly Clear | 5 to 10 mph S | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Jefferson City, MT
Last spring frost
Jun 18
First fall frost
Sep 5
Growing season
81 days
Hardiness zone
4b
Explore more for Jefferson City, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Tizer Gardens, Mt (1.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.