Weather in St. Mary, Montana
Live weather conditions. Source: Open-Meteo
Updated May 30, 2026 · 01:03 AMET · Refreshes every hour
52°F
Overcast
Feels like 47°F
64%
Humidity
7 mph
Wind Speed
7-Day Forecast
Fri
May 29
🌧️
Rain
73°
52°
Sat
May 30
🌧️
Rain
61°
50°
Sun
May 31
🌧️
Rain
50°
43°
Mon
Jun 1
🌧️
Rain
50°
41°
Tue
Jun 2
🌧️
Rain
51°
42°
Wed
Jun 3
🌧️
Rain
57°
42°
Thu
Jun 4
🌧️
Rain
54°
45°
About Weather in St. Mary
St. Mary is located in Montana at coordinates 48.742911°N, 113.427496°W. Weather data is sourced from Open-Meteo, a free and open meteorological API that combines data from national weather services including NOAA, the European Centre for Medium-Range Weather Forecasts (ECMWF), and others.
All temperatures are displayed in Fahrenheit. Wind speed is in miles per hour. The 7-day forecast uses the best available global forecast model for St. Mary's location. Data is refreshed every hour.
Other Cities in Montana
Frequently Asked Questions
How accurate is this weather data?▾
Weather data from Open-Meteo achieves approximately ±2°F accuracy for temperature within the first 24 hours. Accuracy decreases with forecast range — 1-3 day forecasts are quite reliable, while 5-7 day forecasts are directionally accurate but less precise. Open-Meteo uses multiple global weather models and selects the best one for each location.
Why are temperatures shown in Fahrenheit?▾
This site is designed primarily for a US audience, so temperatures are shown in Fahrenheit (°F), the standard unit used in the United States. To convert: °C = (°F - 32) × 5/9. For example, 77°F = 25°C, 32°F = 0°C (freezing), 98.6°F = 37°C (body temperature).
What is the climate like in St. Mary?▾
St. Mary is located in Montana in the northern United States. The current conditions shown reflect real-time weather. For historical climate normals (average temperatures by month), the NOAA Climate Data Online tool provides 30-year climate averages for most US cities.
How often is weather data updated?▾
Current conditions are refreshed every hour. The 7-day forecast uses Open-Meteo's latest model run, which is updated every 6 hours with new data from global weather observations including weather balloons, satellites, and ground stations.