Cook County (Chicago)
May
Weather in Cook County, Illinois for May 2027
Your guide to Cook County weather in May - trends and predictions
In general, the average temperature in Cook County at the beginning of May is 13.5 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 18.3 °C by the end of May.
The climate of Cook County in May is notably wet, with an average of 12 rainy days, and a total of 132.5 mm of precipitation.
Is May a good time to visit Cook County? check out the best time to travel to Cook County page.
✨ Is May a good time to visit Cook County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
19
Dry days
12
Rainy days
0
Snow days
17°/10°
Temperatures
20 km/h
Avg max wind
73 %
Avg humidity
Cook County Weather May
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Temperatures trend during May in Cook County
See the weather trend as well as the moving average line
May weather in Cook County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Light rain | 14° /7° | 2.8 mm | 4 | |
| May 2 |  Patchy rain possible | 14° /7° | 2.1 mm | 4 | |
| May 3 |  Heavy rain at times | 13° /7° | 8.2 mm | 4 | |
| May 4 | Light rain | 14° /7° | 7.9 mm | 4 | |
| May 5 | Light rain | 13° /8° | 2.8 mm | 4 | |
| May 6 | Light rain | 13° /7° | 4.9 mm | 4 | |
| May 7 |  Moderate or heavy rain shower | 15° /8° | 8.4 mm | 4 | |
| May 8 | Light rain | 14° /9° | 8.7 mm | 4 | |
| May 9 | Light rain | 14° /8° | 9.2 mm | 4 | |
| May 10 |  Partly cloudy | 16° /9° | 0.2 mm | 5 | |
| May 11 | Partly cloudy | 15° /10° | 0.5 mm | 5 | |
| May 12 | Light rain | 19° /10° | 2.7 mm | 5 | |
| May 13 | Light rain | 18° /11° | 4.2 mm | 5 | |
| May 14 | Light rain | 15° /10° | 2.7 mm | 5 | |
| May 15 | Light rain | 17° /10° | 3.2 mm | 4 | |
| May 16 | Light rain | 21° /12° | 4.2 mm | 5 | |
| May 17 | Patchy rain possible | 18° /12° | 1.7 mm | 5 | |
| May 18 | Patchy rain possible | 18° /12° | 2.4 mm | 5 | |
| May 19 | Light rain | 20° /12° | 4.2 mm | 5 | |
| May 20 |  Moderate rain | 19° /12° | 17.8 mm | 6 | |
| May 21 | Moderate rain | 18° /12° | 12.1 mm | 6 | |
| May 22 |  Overcast | 18° /12° | 0.2 mm | 5 | |
| May 23 |  Sunny | 18° /12° | 0.8 mm | 4 | |
| May 24 | Light rain | 18° /11° | 5.4 mm | 4 | |
| May 25 | Patchy rain possible | 19° /12° | 1.9 mm | 6 | |
| May 26 | Light rain | 19° /12° | 4.6 mm | 5 | |
| May 27 | Moderate or heavy rain shower | 16° /12° | 5.4 mm | 5 | |
| May 28 | Patchy rain possible | 16° /10° | 1.8 mm | 5 | |
| May 29 | Sunny | 18° /12° | 0 mm | 6 | |
| May 30 | Sunny | 20° /13° | 0.4 mm | 6 | |
| May 31 | Patchy rain possible | 21° /14° | 1.2 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Cook County 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 Cook County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Cook County in May - FAQ
What are the expected maximum and minimum temperatures in Cook County 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 Cook County during May?
Significant rainfall exceeding 132.5 mm is expected in Cook County during May, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Cook County during May?
The average wind speed in Cook County during May is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Cook County
Explore the daily rainfall trends and prepare for Cook Countys May weather 💧
Typically, Cook County has 12 rainy days in May with a total of 132.5 mm of rainfall.
UV exposure in Cook County during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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