St. Louis weather by month

St. Louis, Missouri, enjoys four distinct seasons, offering a varied climate throughout the year. From scorching summers to chilly winters, understanding the weather patterns month by month is key to planning your visit or simply preparing for what’s ahead. This guide provides a detailed look at the typical weather conditions in St. Louis, helping you make the most of everything the Gateway City has to offer.

Overview of St. Louis Climate

St. Louis sits in a humid subtropical climate zone, meaning it experiences hot, humid summers and relatively mild to cold winters. The city is located in the Midwest, making it susceptible to a wide range of weather events, including thunderstorms, tornadoes, and occasional snowstorms. Average rainfall is fairly consistent throughout the year, but humidity levels peak during the summer months. The Mississippi and Missouri Rivers significantly influence the local climate, contributing to the humidity and sometimes moderating temperatures.

St. Louis Weather by Month: A Detailed Breakdown

Here’s a month-by-month look at what you can expect weather-wise in St. Louis:

Month	Avg High (°F)	Avg Low (°F)	Precipitation (in)	Humidity (%)
January	38	21	2.5	72
February	43	25	2.7	68
March	54	34	3.5	65
April	65	44	4.1	62
May	74	54	4.5	68
June	82	64	4.3	73
July	88	68	4.8	78
August	87	66	3.8	76
September	78	58	3.5	70
October	66	47	3.0	65
November	52	35	3.2	68
December	40	23	2.8	74

Spring in St. Louis (March – May)

Spring is a beautiful time to visit St. Louis, as the city comes alive with blooming flowers and warmer temperatures. March can still be chilly, with average highs in the mid-50s, but temperatures steadily rise throughout April and May. Expect occasional rain showers, but also plenty of sunny days. May is particularly pleasant, with average highs reaching the mid-70s. This is a great time for outdoor activities like exploring Forest Park or attending a Cardinals baseball game.

Summer in St. Louis (June – August)

Summers in St. Louis are hot and humid. Average highs consistently reach the upper 80s, and humidity can make it feel even warmer. July is typically the hottest month. Thunderstorms are common, especially in the afternoons. Despite the heat, summer is a popular time to visit, with many outdoor festivals and events taking place. Staying hydrated and seeking shade are essential during this season.

Autumn in St. Louis (September – November)

Fall brings cooler temperatures and vibrant fall foliage to St. Louis. September is still warm, with average highs in the upper 70s, but temperatures gradually decrease throughout October and November. The humidity also drops, making for more comfortable weather. October is often considered one of the most pleasant months, with crisp air and beautiful colors. Expect occasional rain, but generally, fall offers mild and enjoyable weather.

Winter in St. Louis (December – February)

Winters in St. Louis are cold, with average highs in the 30s and 40s. Snowfall is common, but typically doesn’t accumulate to significant depths. January is usually the coldest month. While extreme cold snaps can occur, temperatures often fluctuate above freezing. Ice storms are also a possibility. It’s important to dress warmly in layers and be prepared for potentially hazardous travel conditions.

Frequently Asked Questions (FAQ)

Q: What is the hottest month in St. Louis?
A: July is typically the hottest month, with average highs around 88°F.

Q: Does it snow a lot in St. Louis?
A: St. Louis receives moderate snowfall, averaging around 20 inches per year, but significant accumulations are infrequent.

Q: What is the best time to visit St. Louis for pleasant weather?
A: Spring (April-May) and Fall (September-October) offer the most pleasant weather, with mild temperatures and lower humidity.

Q: Is St. Louis humid?
A: Yes, St. Louis experiences high humidity, especially during the summer months.

Q: Are tornadoes common in St. Louis?
A: St. Louis is located in an area prone to tornadoes, particularly during the spring and summer. It’s important to be aware of weather alerts.