Winnebago County (Rockford)
May
Weather in Winnebago County, Illinois for May 2026
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 18 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 21.9 °F by the end of May.
The climate of Winnebago County in May is notably wet, with an average of 15 rainy days, and a total of 135.3 mm of precipitation.
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Temperatures
Rain 🌧️
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16
Dry days
15
Rainy days
0
Snow days
21°/10°
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
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May weather in Winnebago County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Patchy rain possible | 17° /11° | 17.5 mm | 4 | |
| May 2 | Light rain shower | 18° /9° | 13.8 mm | 4 | |
| May 3 |  Overcast | 17° /9° | 2.2 mm | 4 | |
| May 4 | Light rain shower | 17° /7° | 3.5 mm | 4 | |
| May 5 | Overcast | 15° /7° | 0 mm | 4 | |
| May 6 |  Sunny | 20° /8° | 0 mm | 5 | |
| May 7 | Light rain shower | 22° /11° | 2.8 mm | 5 | |
| May 8 |  Cloudy | 20° /9° | 0.7 mm | 5 | |
| May 9 | Light rain shower | 16° /4° | 5.1 mm | 5 | |
| May 10 | Patchy rain possible | 22° /6° | 0.9 mm | 6 | |
| May 11 | Patchy rain possible | 21° /6° | 0 mm | 6 | |
| May 12 | Sunny | 25° /9° | 1.5 mm | 6 | |
| May 13 | Light rain shower | 23° /15° | 8.9 mm | 6 | |
| May 14 | Overcast | 20° /11° | 0 mm | 5 | |
| May 15 | Overcast | 24° /12° | 0.1 mm | 6 | |
| May 16 | Light rain shower | 26° /12° | 8.3 mm | 6 | |
| May 17 | Patchy rain possible | 20° /12° | 0.3 mm | 5 | |
| May 18 |  Partly cloudy | 20° /10° | 0 mm | 5 | |
| May 19 |  Thundery outbreaks possible | 22° /11° | 20.8 mm | 5 | |
| May 20 | Sunny | 16° /6° | 41.8 mm | 5 | |
| May 21 | Partly cloudy | 16° /8° | 9.8 mm | 4 | |
| May 22 | Partly cloudy | 20° /10° | 0.1 mm | 5 | |
| May 23 | Overcast | 23° /10° | 0 mm | 5 | |
| May 24 | Cloudy | 21° /10° | 2.9 mm | 5 | |
| May 25 | Sunny | 20° /6° | 0 mm | 5 | |
| May 26 | Sunny | 21° /7° | 3.9 mm | 5 | |
| May 27 | Sunny | 21° /9° | 3.9 mm | 5 | |
| May 28 | Partly cloudy | 21° /10° | 16.8 mm | 5 | |
| May 29 | Partly cloudy | 22° /10° | 1.6 mm | 5 | |
| May 30 | Partly cloudy | 24° /10° | 0 mm | 6 | |
| May 31 | Patchy rain possible | 24° /12° | 0.3 mm | 5 | |
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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.
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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 21° and cooler nights around 10°. 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 135.3 mm is expected in Winnebago County during May, occurring over more than 15 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 💧
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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Where is Winnebago County?Get accurate weather forecasts for Winnebago County, located at latitude 42.271 and longitude -89.094. Stay updated with localized weather information tailored for Winnebago County.
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