Chicago (IL)
May
Weather in Chicago, Illinois for May 2026
Your guide to Chicago weather in May - trends and predictions
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The forecast for the first days of May 2026 in Chicago predicts temperatures to be around 12 °F, close to the historical average.
In general, the average temperature in Chicago at the beginning of May is 12.9 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 18.1 °F by the end of May.
Chicago experiences heavy rainfall in May, with over 20 rainy days and an average total precipitation 149.3 mm.
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Temperatures
Rain 🌧️
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5
Dry days
26
Rainy days
0
Snow days
17°/10°
Temperatures
20 km/h
Avg max wind
73 %
Avg humidity
Chicago Weather May
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Temperatures trend during May in Chicago
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May weather in Chicago day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Partly cloudy | 8° /5° | 0 mm | 7.1 | |
| May 2 | Partly cloudy | 9° /4° | 0 mm | 0.3 | |
| May 3 |  Patchy rain possible | 16° /6° | 2.2 mm | 3 | |
| May 4 | Patchy rain possible | 17° /11° | 0.2 mm | 3 | |
| May 5 | Patchy rain possible | 17° /13° | 0.7 mm | 3 | |
| May 6 |  Sunny | 13° /8° | 0 mm | 4 | |
| May 7 | Patchy rain possible | 10° /6° | 2.5 mm | 2 | |
| May 8 | Patchy rain possible | 10° /5° | 0.2 mm | 2 | |
| May 9 | Patchy rain possible | 9° /5° | 0.3 mm | 2 | |
| May 10 | Partly cloudy | 12° /5° | 0 mm | 3 | |
| May 11 | Partly cloudy | 17° /11° | 0.6 mm | 4 | |
| May 12 | Sunny | 18° /10° | 3 mm | 5 | |
| May 13 | Sunny | 19° /12° | 5 mm | 5 | |
| May 14 | Partly cloudy | 16° /10° | 3.3 mm | 4 | |
| May 15 |  Moderate or heavy rain shower | 17° /10° | 2.8 mm | 4 | |
| May 16 |  Overcast | 21° /11° | 3.4 mm | 5 | |
| May 17 | Overcast | 16° /10° | 2.1 mm | 4 | |
| May 18 |  Heavy rain at times | 17° /10° | 1.9 mm | 4 | |
| May 19 | Patchy rain possible | 19° /11° | 4.9 mm | 5 | |
| May 20 | Partly cloudy | 20° /12° | 21.3 mm | 5 | |
| May 21 | Moderate or heavy rain shower | 19° /12° | 14.5 mm | 5 | |
| May 22 | Overcast | 18° /12° | 0.2 mm | 4 | |
| May 23 | Sunny | 19° /12° | 0.9 mm | 5 | |
| May 24 |  Cloudy | 18° /11° | 3.3 mm | 4 | |
| May 25 | Sunny | 18° /11° | 2.3 mm | 5 | |
| May 26 | Heavy rain at times | 18° /11° | 5.5 mm | 4 | |
| May 27 | Moderate or heavy rain shower | 15° /11° | 6.5 mm | 4 | |
| May 28 | Moderate rain at times | 16° /10° | 2.2 mm | 4 | |
| May 29 | Sunny | 18° /11° | 0 mm | 5 | |
| May 30 | Cloudy | 21° /13° | 0.5 mm | 5 | |
| May 31 | Partly cloudy | 21° /14° | 1.4 mm | 5 | |
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Important Notice
Our weather forecast for Chicago in May 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 Chicago forecast closer to your planned date for the most up-to-date weather information.
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Chicago in May - FAQ
What are the expected maximum and minimum temperatures in Chicago during May?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Chicago during May?
Significant rainfall exceeding 149.3 mm is expected in Chicago during May, occurring over more than 26 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Chicago during May?
The average wind speed in Chicago during May is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Chicago
Explore the daily rainfall trends and prepare for Chicagos May weather 💧
Typically, Chicago has 26 rainy days in May with a total of 149.3 mm of rainfall.
UV exposure in Chicago during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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