Decatur (IL)
June
Weather in Decatur, Illinois for June 2026
Your guide to Decatur weather in June - trends and predictions
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So far, June 2026 in Decatur is slightly warmer than the historical average by 0.6 °F.
The forecast for the next days in Decatur predicts temperatures to be around 26 °F, close to the historical average.
In general, the average temperature in Decatur at the beginning of June is 26 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 28.1 °F by the end of June.
Decatur in June brings notable rainfall, with an average of 17 rainy days and a total precipitation of 178.1 mm.
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Temperatures
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13
Dry days
17
Rainy days
0
Snow days
27°/18°
Temperatures
20 km/h
Avg max wind
76 %
Avg humidity
Decatur Weather June
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Temperatures trend during June in Decatur
See the weather trend as well as the moving average line
June weather in Decatur day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jun. 1 |  Light rain shower | 24° /12° | 9.8 mm | 7 | |
| Jun. 2 |  Sunny | 27° /14° | 0 mm | 8 | |
| Jun. 3 | Sunny | 29° /15° | 5.8 mm | 8 | |
| Jun. 4 | Light rain shower | 25° /16° | 8.4 mm | 7 | |
| Jun. 5 | Light rain shower | 25° /18° | 5.9 mm | 8 | |
| Jun. 6 | Patchy rain possible | 26° /18° | 0.4 mm | 7 | |
| Jun. 7 |  Partly cloudy | 26° /16° | 4.9 mm | 8 | |
| Jun. 8 |  Light drizzle | 24° /17° | 23.6 mm | 5 | |
| Jun. 9 |  Overcast | 27° /17° | 3.7 mm | 8 | |
| Jun. 10 |  Cloudy | 26° /15° | 1.7 mm | 8 | |
| Jun. 11 | Sunny | 28° /14° | 12.6 mm | 8 | |
| Jun. 12 | Partly cloudy | 27° /15° | 0 mm | 8 | |
| Jun. 13 |  Thundery outbreaks possible | 27° /17° | 13.2 mm | 8 | |
| Jun. 14 |  Fog | 25° /18° | 2.7 mm | 8 | |
| Jun. 15 | Partly cloudy | 27° /15° | 0 mm | 9 | |
| Jun. 16 |  Patchy light rain with thunder | 27° /16° | 24.6 mm | 8 | |
| Jun. 17 | Patchy light rain with thunder | 29° /18° | 9.7 mm | 8 | |
| Jun. 18 | Patchy rain possible | 27° /20° | 1.4 mm | 8 | |
| Jun. 19 | Patchy light rain | 27° /18° | 10.8 mm | 8 | |
| Jun. 20 | Sunny | 29° /18° | 0 mm | 9.8 | |
| Jun. 21 |  Heavy rain | 21° /16° | 30.9 mm | 3 | |
| Jun. 22 | Patchy rain possible | 21° /14° | 0.3 mm | 5.2 | |
| Jun. 23 | Sunny | 24° /12° | 0 mm | 9.2 | |
| Jun. 24 | Patchy rain possible | 25° /15° | 0.2 mm | 8.5 | |
| Jun. 25 | Patchy rain possible | 26° /18° | 4 mm | 0.2 | |
| Jun. 26 | Patchy rain possible | 26° /16° | 2 mm | 5 | |
| Jun. 27 |  Moderate rain | 28° /19° | 5.5 mm | 5 | |
| Jun. 28 | Sunny | 31° /22° | 0 mm | 7 | |
| Jun. 29 | Patchy rain possible | 30° /24° | 1.3 mm | 6 | |
| Jun. 30 | Patchy rain possible | 31° /20° | 4.9 mm | 6 | |
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Important Notice
Our weather forecast for Decatur in June is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Decatur forecast closer to your planned date for the most up-to-date weather information.
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Decatur in June - FAQ
What are the expected maximum and minimum temperatures in Decatur during June?
During June, expect a variety of temperatures with highs around 27° and lows near 18°, suitable for diverse activities and preferences.
How much rainfall should be expected in Decatur during June?
Significant rainfall exceeding 178.1 mm is expected in Decatur during June, occurring over more than 17 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Decatur during June?
The average wind speed in Decatur during June is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
June rainfall patterns in Decatur
Explore the daily rainfall trends and prepare for Decaturs June weather 💧
Typically, Decatur has 17 rainy days in June with a total of 178.1 mm of rainfall.
UV exposure in Decatur during June
Stay informed about UV levels for safe outdoor activities throughout the month of June ☀️
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