Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average UV index
A beautiful twilight over the Gateway Arch in St. Louis, Missouri
Weather in January
January, the same as December, is a wintry winter month in St. Louis, Missouri, with temperature in the range of an average low of 23.7°F (-4.6°C) and an average high of 39.9°F (4.4°C). The coldest month in St. Weather in January »
Weather in February
February, the last month of the winter in St. Louis, is a frosty month, with temperature in the range of an average high of 45°F (7.2°C) and an average low of 27.7°F (-2.4°C). In St. Weather in February »
Weather in March
March, the first month of the spring in St. Louis, is a moderate month, with an average temperature varying between 36.7°F (2.6°C) and 55.9°F (13.3°C). In St. Louis, the average high-temperature in March rises from a chilly 45°F (7.2°C) in February to a mild 55.9°F (13.3°C). Weather in March »
Weather in April
April is a comfortable spring month in St. Louis, with an average temperature fluctuating between 47.1°F (8.4°C) and 67.5°F (19.7°C). In April, the average high-temperature in St. Weather in April »
Weather in May
May, the last month of the spring in St. Louis, is a moderately hot month, with an average temperature varying between 57.2°F (14°C) and 76.3°F (24.6°C). In May, the average high-temperature in St. Weather in May »
Weather in June
June, the first month of the summer in St. Louis, is also a moderately hot month, with temperature in the range of an average low of 66.7°F (19.3°C) and an average high of 85.1°F (29.5°C). In June, the average high-temperature in St. Weather in June »
Weather in July
July is a hot summer month in St. Louis, Missouri, with an average temperature fluctuating between 71.1°F (21.7°C) and 89.1°F (31.7°C). The warmest month in St. Louis is July, with an average high-temperature of 89.1°F (31.7°C) and an average low-temperature of 71.1°F (21.7°C). In July, the average heat index is estimated at a very hot 102.2°F (39°C). Weather in July »
Weather in August
August, the last month of the summer in St. Louis, is another tropical month, with an average temperature ranging between max 88°F (31.1°C) and min 69.4°F (20.8°C). In August, the average high-temperature in St. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in St. Louis, with an average temperature varying between 60.6°F (15.9°C) and 80.2°F (26.8°C). In September, the average high-temperature in St. Weather in September »
Weather in October
October, like September, is an agreeable autumn month in St. Louis, Missouri, with an average temperature ranging between max 68.5°F (20.3°C) and min 48.9°F (9.4°C). In October, the average high-temperature in St. Weather in October »
Weather in November
November, the last month of the autumn in St. Louis, is another mild month, with an average temperature varying between 38.1°F (3.4°C) and 55.6°F (13.1°C). In St. Louis, the average high-temperature in November drops from a pleasant 68.5°F (20.3°C) in October to a moderate 55.6°F (13.1°C). Weather in November »
Weather in December
The first month of the winter, December, is also a wintry month in St. Louis, with temperature in the range of an average high of 42.4°F (5.8°C) and an average low of 27°F (-2.8°C). In December, the average high-temperature in St. Weather in December »
[Resources]FAQ
What is the coldest month in St. Louis?
With an average high-temperature of 39.9°F (4.4°C) and an average low-temperature of 23.7°F (-4.6°C), January is the coldest month in St. Louis, Missouri.
How much does it rain in St. Louis?
In St. Louis, Missouri, during the entire year, the rain falls for 112.6 days and collects up to 40.94" (1040mm) of precipitation.
When does it snow in St. Louis?
January through April, November and December are months with snowfall in St. Louis.
What is the snowiest month in St. Louis?
The month with the most snowfall in St. Louis is January, when snow falls for 4.7 days and typically aggregates up to 5.59" (142mm) of snow.
How much does it snow in St. Louis?
Throughout the year, in St. Louis, there are 14.5 snowfall days, and 17.72" (450mm) of snow is accumulated.
What are the months with the lowest UV index in St. Louis?
The months with the lowest UV index are January and December, with an average maximum UV index of 2.
What is the driest month in St. Louis?
February is the month with the least rainfall. Rain falls for 8 days and accumulates 2.24" (57mm) of precipitation.
When is Daylight Saving Time (DST) in St. Louis?
On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in St. Louis, Missouri, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from CDT to CST.
What is the least humid month in St. Louis?
The least humid month in St. Louis is April, with an average relative humidity of 63.5%.
What is the wettest month in St. Louis?
The month with the most rainfall in St. Louis is May, when the rain falls for 11.9 days and typically aggregates up to 4.72" (120mm) of precipitation.
When it does not snow in St. Louis?
May through October are months without snowfall.
When are the longest days in St. Louis?
The month with the longest days in St. Louis is June, with an average of 14h and 49min of daylight.
What are the months with the highest UV index in St. Louis?
The months with the highest UV index in St. Louis are June through August, with an average maximum UV index of 9.
What is the warmest month in St. Louis?
The warmest month in St. Louis is July, with an average high-temperature of 89.1°F (31.7°C) and an average low-temperature of 71.1°F (21.7°C).
What month has the most sunshine in St. Louis?
With an average of 10h of sunshine, July has the most sunshine of the year in St. Louis, Missouri.
What is the most humid month in St. Louis?
December is the most humid month, with an average relative humidity of 75.8%.
What is the month with the shortest days in St. Louis?
The month with the shortest days in St. Louis is December, with an average of 9h and 31min of daylight.
What is the month with the least sunshine in St. Louis?
The month with the least sunshine in St. Louis, Missouri, is December, with an average of 4.2h of sunshine.
Average temperature
St. Louis, MO
The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (39.9°F).
The month with the highest average low temperature is July (71°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).
Average humidity
St. Louis, MO
- Average humidity in January:
73% - Average humidity in February:
72% - Average humidity in March:
68.3% - Average humidity in April:
63.5% - Average humidity in May:
66.5% - Average humidity in June:
67.1%
The month with the highest relative humidity is December (75.8%).
The month with the lowest relative humidity is April (63.5%).
Average rainfall
St. Louis, MO
The wettest month (with the highest rainfall) is May (4.7").
The driest month (with the least rainfall) is February (2.2").
Average rainfall days
St. Louis, MO
- Average rainfall days in January:
8.9 days - Average rainfall days in February:
8 days - Average rainfall days in March:
10.3 days - Average rainfall days in April:
11.3 days - Average rainfall days in May:
11.9 days - Average rainfall days in June:
10 days
- Average rainfall days in July:
8.9 days - Average rainfall days in August:
8.2 days - Average rainfall days in September:
7.4 days - Average rainfall days in October:
8.7 days - Average rainfall days in November:
9.6 days - Average rainfall days in December:
9.4 days
The month with the highest number of rainy days is May (11.9 days).
The month with the least rainy days is September (7.4 days).
Average snowfall
St. Louis, MO
The month with the highest snowfall is January (5.6").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
St. Louis, MO
- Average snowfall days in January:
4.7 days - Average snowfall days in February:
3.4 days - Average snowfall days in March:
1.7 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.7 days - Average snowfall days in December:
3.7 days
The month with the highest number of snowfall days is January (4.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
St. Louis, MO
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
5h and 1min - Average sunshine in February:
5h and 4min - Average sunshine in March:
6h and 2min - Average sunshine in April:
7h and 3min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
8h and 4min - Average sunshine in September:
7h and 5min - Average sunshine in October:
6h and 4min - Average sunshine in November:
4h and 4min - Average sunshine in December:
4h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average UV index
St. Louis, MO
The months with the highest UV index are June, July and August (UV index 9).
The months with the lowest UV index are January and December (UV index 2).
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