St. Mary, MT weather
Today, hourly and 7-day forecast, sunrise and sunset, and the normal climate month by month
Weather in St. Mary now
Loading the National Weather Service forecast…
St. Mary weather by the hour
St. Mary weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of St. Mary.
This week in St. Mary
Sunrise, sunset and moon in St. Mary
What is the weather usually like in St. Mary?
Köppen climate classification, calculated from the 1991–2020 normals
- Augustwarmest month · 73°F average high
- Februarycoldest month · 15°F average low
- 26.1 inprecipitation per year · 663 mm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit St. Mary: June to September, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station ST. MARY 1 SSW, MT US (USW00004130), adjusted for the elevation of St. Mary.
St. Mary weather month by month
Sunrise and sunset in St. Mary through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 8:19 AM | 5:07 PM | 8 h 48 min |
| February | 7:39 AM | 5:56 PM | 10 h 17 min |
| March | 7:44 AM | 7:40 PM | 11 h 56 min |
| April | 6:40 AM | 8:26 PM | 13 h 46 min |
| May | 5:49 AM | 9:10 PM | 15 h 20 min |
| June | 5:28 AM | 9:40 PM | 16 h 12 min |
| July | 5:45 AM | 9:34 PM | 15 h 48 min |
| August | 6:25 AM | 8:50 PM | 14 h 24 min |
| September | 7:09 AM | 7:48 PM | 12 h 38 min |
| October | 7:52 AM | 6:45 PM | 10 h 52 min |
| November | 7:41 AM | 4:55 PM | 9 h 14 min |
| December | 8:18 AM | 4:39 PM | 8 h 21 min |
Times for the 15th of each month, local time (America/Denver).
What is the weather like in St. Mary?
St. Mary has a warm-summer humid continental climate. The warmest month is August, with an average high of 73°F (23°C), and the coldest is February, with average lows of 15°F (-10°C).
It gets about 26.1 inches (663 mm) of precipitation a year. The wettest month is June and the driest is July.
The best time to visit St. Mary is June to September. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
More about St. Mary
Weather in towns near St. Mary
Questions about the weather in St. Mary
What is the hottest month in St. Mary?
August, with an average high of 73°F (23°C).
What is the coldest month in St. Mary?
February, with an average low of 15°F (-10°C).
How much does it rain in St. Mary?
About 26.1 inches (663 mm) a year; the wettest month is June.
Does it snow in St. Mary?
Snow is very rare or not recorded at the nearest weather station.
When is the best time to visit St. Mary?
June to September, when temperatures are most pleasant and rainy days are fewer.
What climate does St. Mary have?
Warm-summer humid continental (Köppen Dfb).
What is the weather like in St. Mary in November?
Highs average 37°F and lows 25°F, with about 2.7 inches of precipitation.
What time is sunrise in St. Mary?
Around 7:41 AM in mid-November, and sunset around 4:55 PM. Today’s exact times are shown above.
Where does this St. Mary weather forecast come from?
From the National Weather Service (NOAA), the official U.S. weather agency, for the exact coordinates of St. Mary.
Last updated: