WeatherAlthough St. Louis enjoys four distinct seasons, it's seldom subject to extreme weather conditions. Winters are usually moderate, with a little more than 18 in/46 cm of snow. There are cold spells near 0 F/-18 C, but not for long and not very often. Winter temperatures range 0 F/-18 C to 55 F/13 C. The best time to visit is May-October. Spring temperatures are comfortable, but spring can be rainy, with some severe thunderstorms. Expect summer temperatures to edge near and above 90 F/32 C—especially in July and August. With relative humidity ranging 56%-89%, most travelers will want to set a leisurely pace for sightseeing in summer months. September and October are the least humid, least rainy months. Take along a sweater or jacket for the crisp fall nights.
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