St. Louis (MO) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit St. Louis.
Climate overview of St. Louis
St. Louis, Missouri, United States of America, sees big temperature differences between seasons, with July peaking at 32°C (90°F) and January dropping to 5°C (41°F).
With around 1116 mm (44 in) of annual rain/snowfall, St. Louis has a notably wet climate. However, this rain/snowfall is not evenly distributed — the city has very warm summers and cold winters. The wettest month is June. The sunniest month is July, with 10.4 hours of sunshine per day on average.
St. Louis Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in St. Louis - and find the best time to visit.
Monthly Temperature in St. Louis
Visitors to St. Louis can expect significant temperature changes throughout the year. Average daytime temperatures reach a very warm 32°C (90°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 5°C (41°F).
At night, temperatures range from around 21°C (70°F) in July to -5°C (23°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in St. Louis
St. Louis is known for its substantial rain/snowfall, with annual precipitation reaching 1116 mm (44 in). St. Louis can be quite wet during June, receiving approximately 136 mm (5.4 in) of precipitation over 12 rainy days.
In contrast, during the driest month (January), you will experience much drier conditions, with 50 mm (2 in) of precipitation spread across 8 snowy/rainy days. For more details, please visit our St. Louis 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 St. Louis
St. Louis can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 10.4 hours of sunshine daily. In contrast, the city experiences much darker days in December, 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 St. Louis by Month
The relative humidity is high throughout the year in St. Louis.
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 St. Louis
Each month is rated for comfortable sightseeing weather — mild temperatures and low rainfall. Tap a month for its full averages; your ideal time may differ for a beach or winter trip (see below).
- Best overall: October
- Warmest weather: June, July and August
- Most sunshine: July
- Climate seasons: very warm summers and cold winters
- Best for winter weather: January, with freezing nights around -5°C (23°F).
Frequently asked questions about the climate in St. Louis
What is the best time to visit St. Louis?
October typically offers the most optimal weather in St. Louis. In contrast, January, February and December tend to have less optimal conditions. St. Louis has very warm summers and cold winters.
What temperatures can I expect in St. Louis?
Daytime highs range from 5°C (41°F) in January to 32°C (90°F) in July. Nighttime lows range from -5°C (23°F) to 21°C (70°F). Temperatures vary considerably through the year.
How much rain does St. Louis get?
Annual rainfall is around 1116 mm (44 in). June is the wettest month with 136 mm (5.4 in), while January is the driest with 50 mm (2 in).
How sunny is St. Louis?
St. Louis 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, St. Louis enjoys abundant sunshine.
St. Louis 3-Day Forecast
St. Louis (MO) 3-Day Forecast
St. Louis on the map
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