St. Mary, MO weather
Today, hourly and 7-day forecast, sunrise and sunset, and the normal climate month by month
Weather in St. Mary now
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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
- Julywarmest month · 89°F average high
- Januarycoldest month · 24°F average low
- 42.8 inprecipitation per year · 1,088 mm
- 4.3 insnowfall per year · 11 cm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit St. Mary: May–June and September–October, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station KASKASKIA RVR NAVIGATION LOCK, IL US (USC00114629), 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 | 7:12 AM | 5:05 PM | 9 h 53 min |
| February | 6:47 AM | 5:40 PM | 10 h 52 min |
| March | 7:09 AM | 7:08 PM | 11 h 59 min |
| April | 6:22 AM | 7:36 PM | 13 h 14 min |
| May | 5:47 AM | 8:04 PM | 14 h 16 min |
| June | 5:35 AM | 8:25 PM | 14 h 49 min |
| July | 5:48 AM | 8:23 PM | 14 h 34 min |
| August | 6:14 AM | 7:54 PM | 13 h 40 min |
| September | 6:40 AM | 7:09 PM | 12 h 28 min |
| October | 7:07 AM | 6:23 PM | 11 h 16 min |
| November | 6:39 AM | 4:49 PM | 10 h 10 min |
| December | 7:06 AM | 4:43 PM | 9 h 36 min |
Times for the 15th of each month, local time (America/Chicago).
What is the weather like in St. Mary?
St. Mary has a humid subtropical climate. The warmest month is July, with an average high of 89°F (32°C), and the coldest is January, with average lows of 24°F (-5°C).
It gets about 42.8 inches (1,088 mm) of precipitation a year. The wettest month is May and the driest is February. Snow is common: about 4 inches fall in an average year.
The best time to visit St. Mary is May–June and September–October. At 384 ft of elevation, nights are mild most of the year. 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?
July, with an average high of 89°F (32°C).
What is the coldest month in St. Mary?
January, with an average low of 24°F (-5°C).
How much does it rain in St. Mary?
About 42.8 inches (1,088 mm) a year; the wettest month is May.
Does it snow in St. Mary?
Yes, about 4 inches of snow fall in an average year.
When is the best time to visit St. Mary?
May–June and September–October, when temperatures are most pleasant and rainy days are fewer.
What climate does St. Mary have?
Humid subtropical (Köppen Cfa).
What is the weather like in St. Mary in November?
Highs average 56°F and lows 37°F, with about 4.0 inches of precipitation.
What time is sunrise in St. Mary?
Around 6:39 AM in mid-November, and sunset around 4:49 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.
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