Winnebago County (Rockford)
May
Weather in Winnebago County, Illinois for May 2026
Your guide to Winnebago County weather in May - trends and predictions
Flood Warning - See hour by hour.
The forecast for the upcoming days in Winnebago County predicts a temperature of 19.6 °F, which is slightly above the historical average.
In general, the average temperature in Winnebago County at the beginning of May is 16 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 21.9 °F by the end of May.
Winnebago County in May brings notable rainfall, with an average of 18 rainy days and a total precipitation of 167.3 mm.
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13
Dry days
18
Rainy days
0
Snow days
20°/10°
Temperatures
21 km/h
Avg max wind
72 %
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 |  Patchy rain possible | 15° /8° | 11.9 mm | 5 | |
| May 2 | Light rain shower | 16° /6° | 9.2 mm | 6 | |
| May 3 |  Overcast | 18° /8° | 1.6 mm | 4 | |
| May 4 | Light rain shower | 19° /7° | 2.7 mm | 6 | |
| May 5 | Overcast | 14° /7° | 0.1 mm | 5 | |
| May 6 |  Sunny | 15° /2° | 0 mm | 5 | |
| May 7 | Patchy rain possible | 15° /2° | 0.7 mm | 5.8 | |
| May 8 | Patchy rain possible | 17° /6° | 2.7 mm | 0.3 | |
| May 9 | Sunny | 22° /7° | 0 mm | 4 | |
| May 10 |  Moderate rain | 14° /6° | 8.3 mm | 2 | |
| May 11 | Sunny | 13° /2° | 0 mm | 3 | |
| May 12 | Patchy rain possible | 12° /6° | 0.3 mm | 3 | |
| May 13 | Overcast | 19° /12° | 0 mm | 3 | |
| May 14 | Patchy rain possible | 24° /11° | 1.1 mm | 4 | |
| May 15 | Sunny | 22° /10° | 0 mm | 5 | |
| May 16 |  Partly cloudy | 22° /8° | 0 mm | 4 | |
| May 17 | Patchy rain possible | 23° /13° | 1.4 mm | 4 | |
| May 18 | Moderate rain | 29° /19° | 5.6 mm | 5 | |
| May 19 | Patchy rain possible | 28° /20° | 3.1 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 20° 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 167.3 mm is expected in Winnebago County during May, occurring over more than 18 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 18 rainy days in May with a total of 167.3 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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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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