Saint Peters (MO) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Saint Peters.
Climate overview of Saint Peters
Saint Peters, Missouri, United States of America, sees big temperature differences between seasons, with July peaking at 31°C (88°F) and January dropping to 5°C (41°F).
Rain/snowfall is high, totalling around 1136 mm (45 in) per year. May is the wettest month and January the driest. The city also experiences very warm summers and cold winters. The most sunshine falls in July, with an average of 10.4 hours of daily sunshine.
Saint Peters Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Saint Peters - and find the best time to visit.
Monthly Temperature in Saint Peters
Visitors to Saint Peters can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a very warm 31°C (88°F) in July, the warmest time of the year, to a chilly 5°C (41°F) during cooler months like January.
At night, you can expect temperatures ranging from 20°C (68°F) in July to around -6°C (21°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Saint Peters
Saint Peters is known for its substantial rain/snowfall, with annual precipitation reaching 1136 mm (45 in). Significant seasonal changes in precipitation occur throughout the year. In the wettest month, May it receives high rainfall, averaging 129 mm (5.1 in) of precipitation, recorded across 14 rainy days. In contrast, the driest month January brings less snow/rainfall, with 45 mm (1.8 in) over 7 snowy/rainy days. For more details, please visit our Saint Peters Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Saint Peters
Seasonal changes in sunshine hours are quite dramatic in Saint Peters. While July receives considerable daily sunshine with up to 10.4 hours, December marks the darkest time of the year, where sunshine is scarce with only 4.3 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Saint Peters by Month
The relative humidity is high throughout the year in Saint Peters.
The city experiences its highest humidity in December, reaching 74%. In April, the humidity drops to its lowest level at 63%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Saint Peters
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: October
- Warmest weather: June, July and August
- Most sunshine: July
- Seasonal pattern: Very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
Frequently asked questions about the climate in Saint Peters
What is the best time to visit Saint Peters?
October typically offers the most optimal weather in Saint Peters. In contrast, January, February and December tend to have less optimal conditions. Saint Peters has very warm summers and cold winters.
What temperatures can I expect in Saint Peters?
Daytime highs range from 5°C (41°F) in January to 31°C (88°F) in July. Nighttime lows range from -6°C (21°F) to 20°C (68°F). Temperatures vary considerably through the year.
How much rain does Saint Peters get?
Annual rainfall is around 1136 mm (45 in). May is the wettest month with 129 mm (5.1 in), while January is the driest with 45 mm (1.8 in).
How sunny is Saint Peters?
Saint Peters receives around 2,594 hours of sunshine per year. July is the sunniest month with 311 hours, while December is the cloudiest with just 128 hours. Overall, Saint Peters enjoys abundant sunshine.
Saint Peters 3-Day Forecast
Saint Peters (MO) 3-Day Forecast
Saint Peters on the map
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