The best times to visit Casey for ideal weather are

August 13th to October 14th

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



Other Casey Travel Info

Weather in Casey


Average temperatures in Casey vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 31st 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 Casey, 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 86.7°F (30.4°C) with temperatures rarely dropping below 66.3°F (19.1°C) at night.

Casey Temperatures (Fahrenheit)


Casey 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.

Casey Perceived Temperature (F)


Casey Perceived Temperature (C)



Average Casey 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 35.8 26.8 18.9
Feb 37.2 28.1 20.3
Mar 54.3 43.3 34.4
Apr 66.1 54.4 44.3
May 75.9 65.1 55
Jun 83.8 73.6 63.7
Jul 85.8 75.2 64.9
Aug 85.5 74.3 63.7
Sep 79.5 67.1 56.3
Oct 67.1 55.5 45.5
Nov 53.3 43.1 34.3
Dec 41.1 33.4 26.7

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 2.1 -2.9 -7.3
Feb 2.9 -2.2 -6.5
Mar 12.4 6.3 1.3
Apr 18.9 12.4 6.8
May 24.4 18.4 12.8
Jun 28.8 23.1 17.6
Jul 29.9 24 18.3
Aug 29.7 23.5 17.6
Sep 26.4 19.5 13.5
Oct 19.5 13.1 7.5
Nov 11.8 6.2 1.3
Dec 5.1 0.8 -2.9



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Casey are January, August, and then November. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early January. For example, on the week of January 1st there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in mid June with an average of 2 days of significant precipitation the week of June 18th.

When can you find snow in Casey? 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 Casey.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Casey (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 1.5
Feb 15% 0 2
Mar 17% 0 1.9
Apr 26% 0 4.8
May 24% 0 3.5
Jun 29% 0 5.3
Jul 18% 0 4
Aug 12% 0 1.6
Sep 20% 0 3.5
Oct 15% 0 2.6
Nov 14% 0 2.4
Dec 17% 0 2.8

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 11 0 3.8
Feb 15 0 5.1
Mar 17 0 4.8
Apr 26 0 12.2
May 24 0 8.9
Jun 29 0 13.5
Jul 18 0 10.2
Aug 12 0 4.1
Sep 20 0 8.9
Oct 15 0 6.6
Nov 14 0 6.1
Dec 17 0 7.1


Humidity and Wind

Casey has some very humid months, with other comfortably humid months. The least humid month is April (55.6% relative humidity), and the most humid month is December (74%).

Wind in Casey is usually moderate. The windiest month is January, followed by February and March. January’s average wind speed of around 9.3 knots (10.7 MPH or 17.3 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 late January and early February where average top sustained speeds reach 17.3 knots, which is considered a fresh breeze.

Relative Humidity (%)

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

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 9.3 Gentle breeze 16.1 Significant breeze
Feb 9.2 Gentle breeze 16.3 Significant breeze
Mar 9 Gentle breeze 15.7 Significant breeze
Apr 9 Gentle breeze 16.1 Significant breeze
May 7.3 Gentle breeze 13.8 Significant breeze
Jun 6.3 Light breeze 13.3 Significant breeze
Jul 5.1 Light breeze 11.1 Significant breeze
Aug 4.9 Light breeze 10.7 Gentle breeze
Sep 5.4 Light breeze 11.4 Significant breeze
Oct 7.5 Gentle breeze 13.5 Significant breeze
Nov 8.3 Gentle breeze 14.6 Significant breeze
Dec 8.8 Gentle breeze 15 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 67.8%
Feb 65.7%
Mar 60.3%
Apr 55.6%
May 60.1%
Jun 63.7%
Jul 65.9%
Aug 64.4%
Sep 62.8%
Oct 59.2%
Nov 62.3%
Dec 74%


Is it Safe to Travel to Casey?

Our best data indicates this area is generally safe. As of Oct 07, 2019 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 Sep 23, 2019.


The Busiest and Least Crowded Months

The busiest month for tourism in Casey, IL, US is July, followed by June and August. 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 Casey in November. 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 38.7 in November means 38.7% of the tourists vs. July.



Overall Casey Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 81.4°F (27.4°C) and 41.3°F (5.2°C) with warmer temperatures in the later months. Rain is somewhat common with 5 to 8 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 9 days of precipitation per month. June – August is the busiest season for tourism in Casey, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 82.5°F (28.1°C) and 46.3°F (7.9°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 4 to 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 Casey to be enjoyable for warm weather travelers. The average high during this season is between 41.3°F (5.2°C) and 34.8°F (1.6°C). On average, it rains or snows a fair amount: 3 to 5 times per month. These times of year are fairly slow with tourists.


Best Times to Travelthe United States › Casey, IL, US