- WinterDec–Feb26°44°
- December27°45°
- January24°41°
- February27°45°
- SpringMar–May46°67°
- March36°57°
- April46°68°
- May56°77°
- SummerJun–Aug66°88°
- June64°86°
- July68°89°
- August65°88°
- AutumnSep–Nov46°69°
- September57°82°
- October46°69°
- November35°56°
St. Louis, MO Weather by Month and Climate Averages
St. Louis, MO gets 40.8 in of precipitation a year over about 116 rainy days. July is the warmest month (average high 89°F) and January the coldest (average low 24°F).
St. Louis climate at a glance
Humid subtropical climate
St. Louis, MO has hot summers and chilly winters. Daytime highs range from about 41°F in January to 89°F in July. May is usually the wettest month. The most comfortable time to visit is typically April and October, when daytime highs sit near 69°F.
How much rain does St. Louis get?
St. Louis gets 40.8 in of precipitation in an average year, spread over about 116 days with measurable rain. That is more rainy days than 75% of the US.
May is the wettest month, with 4.8 in. February is the driest, with 2.0 in. May has the most rainy days, about 14.
The longest dry spell in the last five years lasted 27 days, to October 24, 2024.
See where St. Louis ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in Missouri.
St. Louis weather by month
St. Louis weather in January
In January, St. Louis averages a high of 41°F and a low of 24°F. It gets 2.5 in of precipitation over about 8 rainy days. The sun is out about 33% of daylight hours. The January record high is 72°F (2008) and the record low is -14°F (2014).
St. Louis weather in February
In February, St. Louis averages a high of 45°F and a low of 27°F. It gets 2.0 in of precipitation over about 8 rainy days. The sun is out about 44% of daylight hours. The February record high is 86°F (2024) and the record low is -7°F (2014).
St. Louis weather in March
In March, St. Louis averages a high of 57°F and a low of 36°F. It gets 3.3 in of precipitation over about 11 rainy days. The sun is out about 39% of daylight hours. The March record high is 93°F (2026) and the record low is 4°F (2014).
St. Louis weather in April
In April, St. Louis averages a high of 68°F and a low of 46°F. It gets 4.5 in of precipitation over about 11 rainy days. The sun is out about 44% of daylight hours. The April record high is 92°F (2006) and the record low is 24°F (2007). April is one of the most comfortable months to visit.
St. Louis weather in May
In May, St. Louis averages a high of 77°F and a low of 56°F. It gets 4.8 in of precipitation over about 14 rainy days. The sun is out about 38% of daylight hours. The May record high is 95°F (2012) and the record low is 33°F (2011).
St. Louis weather in June
In June, St. Louis averages a high of 86°F and a low of 64°F. It gets 4.4 in of precipitation over about 11 rainy days. The sun is out about 53% of daylight hours. The June record high is 107°F (2012) and the record low is 45°F (2003).
St. Louis weather in July
In July, St. Louis averages a high of 89°F and a low of 68°F. It gets 3.7 in of precipitation over about 9 rainy days. The sun is out about 48% of daylight hours. The July record high is 107°F (2012) and the record low is 50°F (2013).
St. Louis weather in August
In August, St. Louis averages a high of 88°F and a low of 65°F. It gets 3.7 in of precipitation over about 10 rainy days. The sun is out about 51% of daylight hours. The August record high is 105°F (2007) and the record low is 47°F (2004).
St. Louis weather in September
In September, St. Louis averages a high of 82°F and a low of 57°F. It gets 3.4 in of precipitation over about 9 rainy days. The sun is out about 59% of daylight hours. The September record high is 102°F (2011) and the record low is 35°F (2001).
St. Louis weather in October
In October, St. Louis averages a high of 69°F and a low of 46°F. It gets 3.1 in of precipitation over about 9 rainy days. The sun is out about 58% of daylight hours. The October record high is 94°F (2019) and the record low is 22°F (2013). October is one of the most comfortable months to visit.
St. Louis weather in November
In November, St. Louis averages a high of 56°F and a low of 35°F. It gets 3.3 in of precipitation over about 9 rainy days. The sun is out about 54% of daylight hours. The November record high is 85°F (2016) and the record low is 11°F (2019).
St. Louis weather in December
In December, St. Louis averages a high of 45°F and a low of 27°F. It gets 2.3 in of precipitation over about 8 rainy days. The sun is out about 38% of daylight hours. The December record high is 78°F (2025) and the record low is -5°F (2000).
Sunshine, humidity and wind in St. Louis
September is the sunniest month in St. Louis, with sunshine about 59% of daylight hours. January is the cloudiest, at 33%. Over the year the sun shines about 47% of daylight hours. St. Louis is sunnier than 52% of the US.
Humidity peaks in January at 72% and is lowest in April at 56%.
Wind averages 7 mph over the year, and March is the windiest month at 9 mph.
St. Louis has about 46 days a year above 90°F. St. Louis is hotter than 66% of the US.
Thunderstorms occur on about 48 days a year.
See where St. Louis ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
First and last freeze in St. Louis
The first fall freeze in St. Louis typically comes around October 22, and the last spring freeze around April 9. That leaves a frost-free growing season of about 196 days.
St. Louis weather records
The hottest temperature on record at the St. Louis station is 107°F, on June 28, 2012. The coldest is -14°F, on January 7, 2014.
The wettest day on record brought 7.2 in of rain, on July 26, 2022.
44 all-time records have been set at the station since 1997.
The best time to visit St. Louis
The most comfortable time to visit is typically April and October, when daytime highs sit near 69°F.
Winter (December–February) is chilly, with average highs around 44°F and lows near 26°F.
Spring (March–May) is mild, with average highs around 67°F and lows near 46°F.
Summer (June–August) is hot, with average highs around 88°F and lows near 66°F.
Autumn (September–November) is warm, with average highs around 69°F and lows near 46°F.
Monthly climate
| Month | Precip | Rain days | Wind | Humidity | Sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|
| January | 2.5 in | 8 | 8 mph | 72% | 33% | 72° | -14° |
| February | 2.0 in | 8 | 9 mph | 65% | 44% | 86° | -7° |
| March | 3.3 in | 11 | 9 mph | 60% | 39% | 93° | 4° |
| April | 4.5 in | 11 | 9 mph | 56% | 44% | 92° | 24° |
| May | 4.8 in | 14 | 7 mph | 64% | 38% | 95° | 33° |
| June | 4.4 in | 11 | 6 mph | 60% | 53% | 107° | 45° |
| July | 3.7 in | 9 | 5 mph | 70% | 48% | 107° | 50° |
| August | 3.7 in | 10 | 5 mph | 72% | 51% | 105° | 47° |
| September | 3.4 in | 9 | 5 mph | 67% | 59% | 102° | 35° |
| October | 3.1 in | 9 | 6 mph | 64% | 58% | 94° | 22° |
| November | 3.3 in | 9 | 7 mph | 64% | 54% | 85° | 11° |
| December | 2.3 in | 8 | 8 mph | 71% | 38% | 78° | -5° |
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
St. Louis climate questions
How much rain does St. Louis get?
St. Louis gets 40.8 in of precipitation in an average year, over about 116 rainy days.
What is the wettest month in St. Louis?
May is the wettest month in St. Louis, with 4.8 in. February is the driest, with 2.0 in.
How many rainy days does St. Louis have a year?
St. Louis has about 116 days with measurable rain in an average year. May has the most, about 14.
What is the hottest month in St. Louis?
July is the warmest month in St. Louis, with an average high of 89°F.
What is the coldest month in St. Louis?
January is the coldest month in St. Louis, with an average low of 24°F.
What is the record high temperature in St. Louis?
The record high at the St. Louis station is 107°F, set on June 28, 2012. The record low is -14°F, on January 7, 2014.
What is the sunniest month in St. Louis?
September is the sunniest month in St. Louis, with sunshine about 59% of daylight hours. January is the cloudiest.
When is the first frost in St. Louis?
The first fall freeze in St. Louis typically comes around October 22. The last spring freeze is around April 9.
What is the best time to visit St. Louis?
The most comfortable time to visit is typically April and October, when daytime highs sit near 69°F.
Source: NOAA GHCN-Daily station CAHOKIA ST LOUIS DWTN AP (8 km away).
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Normals from NOAA GHCN-Daily station CAHOKIA ST LOUIS DWTN AP.