The best times to visit Vandalia for ideal weather are

April 16th to June 10th

or

August 13th to October 28th

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

 

 


Other Vandalia Travel Info

Weather in Vandalia

Temperature

Average temperatures in Vandalia vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a very low chance of rain or snow throughout the year. The area is somewhat temperate — in the 41st 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 Vandalia, 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 88.9°F (31.6°C) with temperatures rarely dropping below 68.8°F (20.4°C) at night.

Vandalia Temperatures (Fahrenheit)

Key
High
Average
Low

Vandalia Temperatures (Celsius)

Key
High
Average
Low

“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.

Vandalia Perceived Temperature (F)

Key
High
Average
Low

Vandalia Perceived Temperature (C)

Key
High
Average
Low

 

Average Vandalia 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 39.8 30.8 23.5
Feb 41.7 32.5 25.3
Mar 57.8 46.7 38.1
Apr 68.4 57 47.4
May 77.5 66.8 57.1
Jun 86.1 75.6 66
Jul 87.8 77.3 67.7
Aug 87.1 75.9 65.7
Sep 80.8 68.6 58.5
Oct 70 57.5 47.2
Nov 56.5 46.1 37.2
Dec 45 37 30.5

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 4.3 -0.7 -4.7
Feb 5.4 0.3 -3.7
Mar 14.3 8.2 3.4
Apr 20.2 13.9 8.6
May 25.3 19.3 13.9
Jun 30.1 24.2 18.9
Jul 31 25.2 19.8
Aug 30.6 24.4 18.7
Sep 27.1 20.3 14.7
Oct 21.1 14.2 8.4
Nov 13.6 7.8 2.9
Dec 7.2 2.8 -0.8

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Vandalia are February, January, and then July. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early to mid February. For example, on the week of February 12th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early April with an average of 2 days of significant precipitation the week of April 2nd.

When can you find snow in Vandalia? 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 Vandalia.

Key
Days with precipitation

Snow on the Ground

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

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 7% 0 1
Feb 4% 0 0.5
Mar 13% 0 1.3
Apr 16% 0 2.7
May 13% 0 1.5
Jun 14% 0 2.3
Jul 9% 0 1.6
Aug 10% 0 1.5
Sep 10% 0 1.9
Oct 10% 0 1.5
Nov 11% 0 1.2
Dec 11% 0 2

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 7 0 2.5
Feb 4 0 1.3
Mar 13 0 3.3
Apr 16 0 6.9
May 13 0 3.8
Jun 14 0 5.8
Jul 9 0 4.1
Aug 10 0 3.8
Sep 10 0 4.8
Oct 10 0 3.8
Nov 11 0 3
Dec 11 0 5.1

 

Humidity and Wind

Vandalia has some very humid months, with other comfortably humid months. The least humid month is April (53.3% relative humidity), and the most humid month is December (70.7%).

Wind in Vandalia is usually calm. The windiest month is January, followed by February and April. January’s average wind speed of around 7.7 knots (8.8 MPH or 14.2 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 to mid April where average top sustained speeds reach 16.5 knots, which is considered a moderate breeze.

Relative Humidity (%)

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

Key
Avg. Relative Humidity

Wind

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

Key
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 7.7 Gentle breeze 14.7 Significant breeze
Feb 7.4 Gentle breeze 14.5 Significant breeze
Mar 7.3 Gentle breeze 14.8 Significant breeze
Apr 7.4 Gentle breeze 15.7 Significant breeze
May 5.6 Light breeze 13.1 Significant breeze
Jun 5.1 Light breeze 12.6 Significant breeze
Jul 3.8 Barely noticeable 10.2 Significant breeze
Aug 3.4 Barely noticeable 9.6 Gentle breeze
Sep 3.6 Barely noticeable 9.5 Significant breeze
Oct 5.5 Light breeze 12 Significant breeze
Nov 6.5 Light breeze 13.4 Significant breeze
Dec 7 Gentle breeze 13.8 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 63.5%
Feb 62.8%
Mar 58.7%
Apr 53.3%
May 57.9%
Jun 61%
Jul 64.5%
Aug 63.3%
Sep 63.3%
Oct 57.4%
Nov 58.3%
Dec 70.7%

 

Is it Safe to Travel to Vandalia?

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 Vandalia, 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 Vandalia 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

Key
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 Vandalia Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderate. Highs range from 83.1°F (28.4°C) and 45.9°F (7.7°C) with warmer temperatures in the later months. Rain is somewhat common with 4 to 5 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 3 to 4 days of precipitation per month. June – August is the busiest season for tourism in Vandalia, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 83.5°F (28.6°C) and 49.9°F (9.9°C), which will feel comfortable given the humidity and wind. It rains or snows a normal amount: approximately 3 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 Vandalia to be enjoyable for warm weather travelers. The average high during this season is between 45.9°F (7.7°C) and 38.8°F (3.8°C). On average, it rains or snows a smalll amount: 1 to 4 times per month. These times of year are fairly slow with tourists.

 

Best Times to Travel› the United States › Vandalia, IL, US