Winnebago County (Rockford)
May
Weather in Winnebago County, Illinois for May 2027
Your guide to Winnebago County weather in May - trends and predictions
In general, the average temperature in Winnebago County at the beginning of May is 16.6 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 22.9 °C by the end of May.
Winnebago County experiences moderate rainfall in May, with an average of 10 rainy days and a total precipitation of 129.3 mm.
Is May a good time to visit Winnebago County? check out the best time to travel to Winnebago County page.
✨ Is May a good time to visit Winnebago County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
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21
Dry days
10
Rainy days
0
Snow days
20°/9°
Temperatures
21 km/h
Avg max wind
71 %
Avg humidity
Winnebago County Weather May
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Temperatures trend during May in Winnebago County
See the weather trend as well as the moving average line
May weather in Winnebago County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Moderate rain | 14° /8° | 11.9 mm | 5 | |
| May 2 |  Light rain | 16° /6° | 9.2 mm | 6 | |
| May 3 |  Patchy rain possible | 17° /8° | 1.6 mm | 4 | |
| May 4 | Light rain | 19° /7° | 2.7 mm | 6 | |
| May 5 |  Overcast | 14° /7° | 0.1 mm | 5 | |
| May 6 |  Sunny | 17° /7° | 0 mm | 6 | |
| May 7 | Light rain | 19° /8° | 2.9 mm | 5 | |
| May 8 | Overcast | 19° /8° | 0.5 mm | 6 | |
| May 9 | Light rain | 17° /6° | 3.5 mm | 6 | |
| May 10 |  Partly cloudy | 19° /6° | 0.6 mm | 7 | |
| May 11 | Patchy rain possible | 19° /6° | 0 mm | 7 | |
| May 12 | Patchy rain possible | 24° /8° | 1.1 mm | 6 | |
| May 13 | Light rain | 20° /13° | 5.9 mm | 6 | |
| May 14 | Overcast | 20° /9° | 0 mm | 6 | |
| May 15 | Patchy rain possible | 24° /12° | 1.9 mm | 5 | |
| May 16 | Light rain | 26° /14° | 7.2 mm | 6 | |
| May 17 | Patchy rain possible | 22° /13° | 1 mm | 5 | |
| May 18 | Patchy rain possible | 22° /13° | 2.1 mm | 6 | |
| May 19 |  Thundery outbreaks possible | 21° /11° | 16.4 mm | 5 | |
| May 20 |  Heavy rain | 16° /6° | 27.8 mm | 6 | |
| May 21 | Light rain | 16° /9° | 9.8 mm | 4 | |
| May 22 |  Cloudy | 20° /10° | 0 mm | 6 | |
| May 23 | Overcast | 23° /11° | 0.4 mm | 5 | |
| May 24 | Light rain | 22° /11° | 2.6 mm | 6 | |
| May 25 | Partly cloudy | 21° /9° | 0 mm | 6 | |
| May 26 | Light rain | 23° /10° | 2.9 mm | 6 | |
| May 27 | Light rain | 23° /11° | 2.9 mm | 6 | |
| May 28 | Moderate rain | 21° /10° | 12.6 mm | 6 | |
| May 29 | Patchy rain possible | 23° /10° | 1.2 mm | 7 | |
| May 30 | Sunny | 25° /11° | 0 mm | 7 | |
| May 31 | Patchy rain possible | 26° /12° | 0.2 mm | 7 | |
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Important Notice
Our weather forecast for Winnebago 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 Winnebago County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Winnebago County in May - FAQ
What are the expected maximum and minimum temperatures in Winnebago County during May?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Winnebago County during May?
Significant rainfall exceeding 129.3 mm is expected in Winnebago County during May, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Winnebago County during May?
The average wind speed in Winnebago County during May is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Winnebago County
Explore the daily rainfall trends and prepare for Winnebago Countys May weather 💧
Typically, Winnebago County has 10 rainy days in May with a total of 129.3 mm of rainfall.
UV exposure in Winnebago County during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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