Climate and monthly weather forecast
Collinsville, IL

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Weather in January

January, the same as December, is a wintry winter month in Collinsville, Illinois, with an average temperature fluctuating between 24.3°F (-4.3°C) and 37.4°F (3°C). January tends to be the coldest month, with temperatures averaging a daily high of 37.4°F (3°C) and a low of 24.3°F (-4.3°C). Weather in January »

Weather in February

February, the last month of the winter in Collinsville, is also a wintry month, with an average temperature ranging between min 27.5°F (-2.5°C) and max 42.1°F (5.6°C). February denotes a minimal variation in the average high-temperature to a still icy 42.1°F (5.6°C) from January's 37.4°F (3°C). Weather in February »

Weather in March

March, the first month of the spring in Collinsville, is a fresh month, with an average temperature varying between 54.1°F (12.3°C) and 37.8°F (3.2°C). Noticing a change, the average high-temperature during March moves from February's cold 42.1°F (5.6°C) to a fresh 54.1°F (12.3°C). Weather in March »

Weather in April

April is an enjoyable spring month in Collinsville, Illinois, with an average temperature ranging between max 64.9°F (18.3°C) and min 47.8°F (8.8°C). The shift from March to April brings an increase in the average high-temperature, moving from a fresh 54.1°F (12.3°C) to a refreshing 64.9°F (18.3°C). Weather in April »

Weather in May

The last month of the spring, May, is a moderately hot month in Collinsville, Illinois, with an average temperature ranging between max 74.5°F (23.6°C) and min 57.6°F (14.2°C). Collinsville's transition into May sees a rise in the average high-temperature, advancing from a refreshing 64.9°F (18.3°C) in April to a warm 74.5°F (23.6°C). Weather in May »

Weather in June

June, the first month of the summer in Collinsville, is still a warm month, with an average temperature fluctuating between 83.3°F (28.5°C) and 66.6°F (19.2°C). As Collinsville welcomes June, the average high-temperature sees a modest rise, transitioning from 74.5°F (23.6°C) in May to a still warm 83.3°F (28.5°C). Weather in June »

Weather in July

July, like June, in Collinsville, Illinois, is a moderately hot summer month, with an average temperature ranging between max 85.6°F (29.8°C) and min 68.2°F (20.1°C). Collinsville experiences its highest average temperatures in July, reaching a peak of 85.6°F (29.8°C) and a minimum of 68.2°F (20.1°C). July's average heat index is estimated at a very hot 98.6°F (37°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Collinsville, Illinois, with an average temperature varying between 66°F (18.9°C) and 84°F (28.9°C). The transition from July to August brings an average high-temperature of a still moderately hot 84°F (28.9°C), barely different from July's 85.6°F (29.8°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Collinsville, Illinois, with an average temperature fluctuating between 79°F (26.1°C) and 59.9°F (15.5°C). The average high-temperature during September registers at a still warm 79°F (26.1°C), closely corresponding to the preceding month. Weather in September »

Weather in October

October, like September, in Collinsville, Illinois, is another comfortable autumn month, with an average temperature varying between 48.9°F (9.4°C) and 66°F (18.9°C). October brings a minor decrease, with the average high-temperature reducing from a moderately hot 79°F (26.1°C) in September to an enjoyable 66°F (18.9°C). Weather in October »

Weather in November

The last month of the autumn, November, is another cool month in Collinsville, Illinois, with an average temperature varying between 52.9°F (11.6°C) and 37.6°F (3.1°C). Transition into November marks a drop in the average high-temperature, moving from a refreshing 66°F (18.9°C) in October to a fresh 52.9°F (11.6°C). Weather in November »

Weather in December

December, the first month of the winter in Collinsville, is still a cold month, with temperature in the range of an average high of 41.9°F (5.5°C) and an average low of 30°F (-1.1°C). As November transitions into December, Collinsville sees a drop in the average high-temperature, transitioning from a fresh 52.9°F (11.6°C) to an icy 41.9°F (5.5°C). Weather in December »
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Frequently asked questions

What time of the year is the coldest in Collinsville?

January, on average, is the coldest month, registering a high temperature of 37.4°F (3°C) and a low of 24.3°F (-4.3°C).

How many days does it rain in Collinsville?

In Collinsville, during the entire year, the rain falls for 149.9 days and collects up to 33.94" (862mm) of precipitation.

When does it snow in Collinsville?

January through March, September, November and December are months with snowfall in Collinsville, Illinois.

When does it snow the most in Collinsville?

January is the month with the most snowfall. Snow falls for 7 days and accumulates 2.13" (54mm) of snow.

How much does it snow in Collinsville?

In Collinsville, Illinois, during the entire year, snow falls for 20.7 days and aggregates up to 7.13" (181mm) of snow.

What is the month with the least sunshine in Collinsville?

With an average of 4.5h of sunshine, January has the least sunshine of the year in Collinsville, Illinois.

When is the lowest UV index in Collinsville?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the driest month in Collinsville?

The month with the least rainfall in Collinsville is February, when the rain falls for 8.3 days and typically collects 1.77" (45mm) of precipitation.

When is Daylight Saving Time (DST) in Collinsville?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.

When it does not snow in Collinsville?

April through August and October are months without snowfall in Collinsville.

What is the most humid month in Collinsville?

May, July and August, with an average relative humidity of 79%, are most humid months in Collinsville, Illinois.

What is the rainiest month in Collinsville?

The month with the most rainfall in Collinsville is May, when the rain falls for 17.1 days and typically aggregates up to 4.17" (106mm) of precipitation.

What are the months with the highest UV index in Collinsville?

The months with the highest UV index in Collinsville, Illinois, are May through August, with an average maximum UV index of 6.

When are the longest days in Collinsville?

With an average of 14h and 48min of daylight, June has the longest days of the year.

What month has the most sunshine in Collinsville?

June has the most sunshine of the year, with an average of 10.5h of sunshine.

What is the warmest month in Collinsville?

July stands out as Collinsville's warmest month, with an average high-temperature of 85.6°F (29.8°C) and a low-temperature of 68.2°F (20.1°C).

What is the least humid month in Collinsville?

With an average relative humidity of 71%, October is the least humid month in Collinsville.

What is the month with the shortest days in Collinsville?

December has the shortest days of the year in Collinsville, with an average of 9h and 30min of daylight.

Average temperature
Collinsville, IL

Average temperature - Collinsville, IL

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.4°F).

The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

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Average pressure
Collinsville, IL

Average pressure - Collinsville, IL

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed
Collinsville, IL

Average wind speed - Collinsville, IL

The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest month (with the lowest average wind speed) is July (5.6mph).

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Average humidity
Collinsville, IL

Average humidity - Collinsville, IL

The months with the highest relative humidity are May, July and August (79%).
The month with the lowest relative humidity is October (71%).

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Average rainfall
Collinsville, IL

Average rainfall - Collinsville, IL

The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is February (1.77").

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Average rainfall days
Collinsville, IL

Average rainfall days - Collinsville, IL

The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall
Collinsville, IL

Average snowfall - Collinsville, IL

The month with the highest snowfall is January (2.13").
The months with the least snowfall are April, May, June, July, August and October (0").

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Average snowfall days
Collinsville, IL

Average snowfall days - Collinsville, IL

The month with the highest number of snowfall days is January (7 days).
The months with the least snowfall days are May, June, July and August (0 days).

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Average daylight / Average sunshine
Collinsville, IL

Average daylight / Average sunshine - Collinsville, IL

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).

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).

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Average sunshine days
Collinsville, IL

Average sunshine days - Collinsville, IL

The month with the most sunshine days is December (18.6 days).
The month with the least sunshine days is May (11.6 days).

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Average UV index
Collinsville, IL

Average UV index - Collinsville, IL

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
Collinsville, IL

Average visibility - Collinsville, IL

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Collinsville, Illinois, USA

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