Vandalia (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Vandalia.
Climate overview of Vandalia
Vandalia, Illinois, United States of America, sees big temperature differences between seasons, with July peaking at 31°C (88°F) and January dropping to 3°C (37°F).
Rain/snowfall is high, totalling around 1236 mm (49 in) per year. June is the wettest month and January the driest. The city also experiences very warm summers and cold winters.
Vandalia Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Vandalia - and find the best time to visit.
Monthly Temperature in Vandalia
Visitors to Vandalia can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a very warm 31°C (88°F) in July, the warmest time of the year, to a chilly 3°C (37°F) during cooler months like January.
At night, you can expect temperatures ranging from 19°C (66°F) in July to around -6°C (21°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Vandalia
Vandalia is known for its substantial rain/snowfall, with annual precipitation reaching 1236 mm (49 in). Significant seasonal changes in precipitation occur throughout the year. In the wettest month, June it receives heavy rainfall, averaging 163 mm (6.4 in) of precipitation, recorded across 12 rainy days. In contrast, the driest month January brings less snow/rainfall, with 59 mm (2.3 in) over 8 snowy/rainy days. For more details, please visit our Vandalia Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Vandalia
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: October
- Warmest weather: June, July and August
- Seasonal pattern: Very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
Frequently asked questions about the climate in Vandalia
What is the best time to visit Vandalia?
October typically offers the most optimal weather in Vandalia. In contrast, January, February and December tend to have less optimal conditions. Vandalia has very warm summers and cold winters.
What temperatures can I expect in Vandalia?
Daytime highs range from 3°C (37°F) in January to 31°C (88°F) in July. Nighttime lows range from -6°C (21°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Vandalia get?
Annual rainfall is around 1236 mm (49 in). June is the wettest month with 163 mm (6.4 in), while January is the driest with 59 mm (2.3 in).
Vandalia 3-Day Forecast
Vandalia (IL) 3-Day Forecast
Vandalia on the map
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