South Glastonbury, MT Weather & Growing Conditions
This Afternoon
57°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. High near 57, with temperatures falling to around 55 in the afternoon. Northeast wind around 8 mph. Chance of precipitation is 50%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 57°F | Chance Showers And Thunderstorms | 8 mph NE | 52% |
| Tonight | 46°F | Chance Rain Showers | 1 to 8 mph N | 52% |
| Sunday | 61°F | Patchy Fog then Partly Sunny | 1 to 7 mph SE | 15% |
| Sunday Night | 45°F | Partly Cloudy | 3 to 7 mph SSW | 3% |
| Monday | 70°F | Sunny | 3 to 9 mph S | 6% |
| Monday Night | 47°F | Mostly Clear | 3 to 9 mph SSW | 0% |
| Tuesday | 72°F | Sunny | 6 to 10 mph S | 1% |
| Tuesday Night | 50°F | Partly Cloudy | 6 to 10 mph SSW | 11% |
| Wednesday | 71°F | Mostly Sunny | 8 to 12 mph SSW | 13% |
| Wednesday Night | 50°F | Mostly Clear | 8 to 15 mph SSW | 6% |
| Thursday | 74°F | Sunny | 12 to 15 mph SSW | 1% |
| Thursday Night | 51°F | Mostly Clear | 10 to 17 mph SSW | 1% |
| Friday | 74°F | Mostly Sunny | 15 mph S | 2% |
| Friday Night | 50°F | Partly Cloudy | 12 to 15 mph SSW | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for South Glastonbury, MT
Last spring frost
May 21
First fall frost
Sep 27
Growing season
128 days
Hardiness zone
5a
Explore more for South Glastonbury, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Gardiner, Mt (18.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.