The best times to visit Caseyville for ideal weather are

April 16th to June 10th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Caseyville Travel Info

Weather in Caseyville


Average temperatures in Caseyville vary drastically. Considering humidity, temperatures feel nice between summer and winter. The temperatures feel cold for about half the year, and too hot for part of the year with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 23rd percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Caseyville, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 91.2°F (32.9°C) with temperatures rarely dropping below 68.7°F (20.4°C) at night.

Caseyville Temperatures (Fahrenheit)


Caseyville Temperatures (Celsius)


“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Caseyville Perceived Temperature (F)


Caseyville Perceived Temperature (C)



Average Caseyville Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 41.6 31 22.3
Feb 43.2 32.6 24.1
Mar 59.3 46.7 36.6
Apr 69.4 56.9 46
May 78.6 66.9 56
Jun 87.5 76.1 65.2
Jul 90.1 78.3 67.4
Aug 89.2 76.8 65.4
Sep 81.6 68.6 57.2
Oct 70.6 57.3 45.7
Nov 57.6 45.7 35.8
Dec 45.5 36.2 28.5

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 5.3 -0.6 -5.4
Feb 6.2 0.3 -4.4
Mar 15.2 8.2 2.6
Apr 20.8 13.8 7.8
May 25.9 19.4 13.3
Jun 30.8 24.5 18.4
Jul 32.3 25.7 19.7
Aug 31.8 24.9 18.6
Sep 27.6 20.3 14
Oct 21.4 14.1 7.6
Nov 14.2 7.6 2.1
Dec 7.5 2.3 -1.9



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Caseyville are January, August, and then February. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid January. For example, on the week of January 15th there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in early to mid May with an average of 2 days of significant precipitation the week of May 7th.

When can you find snow in Caseyville? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Caseyville.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Caseyville (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 11% 0 1.8
Feb 16% 0 2
Mar 22% 0 3.6
Apr 28% 0 5.5
May 30% 0 5
Jun 27% 0 5.1
Jul 19% 0 3.9
Aug 13% 0 2.7
Sep 20% 0 4.1
Oct 19% 0 3
Nov 19% 0 3
Dec 20% 0 3.4

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 11 0 4.6
Feb 16 0 5.1
Mar 22 0 9.1
Apr 28 0 14
May 30 0 12.7
Jun 27 0 13
Jul 19 0 9.9
Aug 13 0 6.9
Sep 20 0 10.4
Oct 19 0 7.6
Nov 19 0 7.6
Dec 20 0 8.6


Humidity and Wind

Caseyville has some high humidity months, with other comfortably humid months. The least humid month is April (52.7% relative humidity), and the most humid month is December (65.2%).

Wind in Caseyville is usually calm. The windiest month is February, followed by March and April. February’s average wind speed of around 7.6 knots (8.7 MPH or 14.1 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early April where average top sustained speeds reach 15.4 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Caseyville.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 7.4 Gentle breeze 14 Significant breeze
Feb 7.6 Gentle breeze 14.6 Significant breeze
Mar 7.4 Gentle breeze 14.3 Significant breeze
Apr 7.4 Gentle breeze 14.9 Significant breeze
May 5.6 Light breeze 12.7 Significant breeze
Jun 5 Light breeze 12.3 Significant breeze
Jul 4.2 Light breeze 10.5 Significant breeze
Aug 3.9 Barely noticeable 10 Gentle breeze
Sep 4.1 Light breeze 10.2 Significant breeze
Oct 5.6 Light breeze 12 Significant breeze
Nov 6.4 Light breeze 12.9 Significant breeze
Dec 6.7 Light breeze 13.1 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 56.8%
Feb 56.2%
Mar 55.3%
Apr 52.7%
May 58.9%
Jun 59.6%
Jul 60%
Aug 61.3%
Sep 62.4%
Oct 56.1%
Nov 55.8%
Dec 65.2%


Is it Safe to Travel to Caseyville?

Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Dec 04, 2023.


The Busiest and Least Crowded Months

The busiest month for tourism in Caseyville, IL, US is July, followed by June and May. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Caseyville in January. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 50.2 in January means 50.2% of the tourists vs. July.



Overall Caseyville Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderate. Highs range from 83.8°F (28.8°C) and 47.3°F (8.5°C) with warmer temperatures in the later months. Rain is somewhat common with 7 to 9 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see moderate precipitation with 4 to 8 days of precipitation per month. June – August is the busiest season for tourism in Caseyville, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 84.5°F (29.2°C) and 51°F (10.6°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: approximately 6 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is far too cold this time of year in Caseyville to be enjoyable for warm weather travelers. The average high during this season is between 47.3°F (8.5°C) and 41.2°F (5.1°C). On average, it rains or snows a fair amount: 4 to 6 times per month. These times of year are fairly slow with tourists.


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