Jefferson County (Fairfield)
May
Weather in Jefferson County, Iowa for May 2026
Your guide to Jefferson County weather in May - trends and predictions
In general, the average temperature in Jefferson County at the beginning of May is 17.9 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 20.3 °F by the end of May.
Jefferson County experiences moderate rainfall in May, with an average of 7 rainy days and a total precipitation of 50.2 mm.
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Temperatures
Rain 🌧️
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24
Dry days
7
Rainy days
0
Snow days
21°/10°
Temperatures
20 km/h
Avg max wind
72 %
Avg humidity
Jefferson County Weather May
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Temperatures trend during May in Jefferson County
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May weather in Jefferson County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Moderate rain at times | 18° /12° | 5.3 mm | 4 | |
| May 2 |  Patchy rain possible | 16° /9° | 0.5 mm | 4 | |
| May 3 | Patchy rain possible | 14° /5° | 0.1 mm | 3 | |
| May 4 |  Overcast | 17° /5° | 0 mm | 4 | |
| May 5 | Overcast | 17° /7° | 0 mm | 4 | |
| May 6 | Overcast | 20° /8° | 0 mm | 5 | |
| May 7 | Overcast | 23° /11° | 0 mm | 5 | |
| May 8 |  Cloudy | 19° /8° | 0 mm | 4 | |
| May 9 |  Sunny | 21° /4° | 0 mm | 6 | |
| May 10 | Sunny | 27° /8° | 0 mm | 7 | |
| May 11 | Sunny | 25° /9° | 0 mm | 7 | |
| May 12 | Cloudy | 29° /12° | 0 mm | 6 | |
| May 13 | Patchy rain possible | 27° /17° | 0.3 mm | 6 | |
| May 14 | Overcast | 30° /16° | 0 mm | 7 | |
| May 15 | Overcast | 31° /19° | 0 mm | 7 | |
| May 16 | Patchy rain possible | 26° /16° | 0.1 mm | 6 | |
| May 17 | Overcast | 18° /10° | 0 mm | 4 | |
| May 18 | Overcast | 22° /7° | 0 mm | 5 | |
| May 19 | Moderate or heavy rain shower | 22° /11° | 10.3 mm | 5 | |
| May 20 | Moderate or heavy rain shower | 20° /13° | 25.7 mm | 5 | |
| May 21 | Overcast | 15° /8° | 0 mm | 4 | |
| May 22 | Overcast | 16° /6° | 0 mm | 4 | |
| May 23 | Overcast | 19° /7° | 0.1 mm | 4 | |
| May 24 | Overcast | 21° /12° | 0.2 mm | 5 | |
| May 25 |  Heavy rain at times | 13° /10° | 4.5 mm | 3 | |
| May 26 |  Fog | 18° /6° | 0 mm | 4 | |
| May 27 | Overcast | 18° /12° | 0 mm | 4 | |
| May 28 | Moderate rain at times | 20° /13° | 3.1 mm | 5 | |
| May 29 | Fog | 20° /12° | 0 mm | 5 | |
| May 30 |  Thundery outbreaks possible | 24° /12° | 0 mm | 5 | |
| May 31 | Sunny | 29° /14° | 0 mm | 7 | |
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Important Notice
Our weather forecast for Jefferson 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 Jefferson County forecast closer to your planned date for the most up-to-date weather information.
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Jefferson County in May - FAQ
What are the expected maximum and minimum temperatures in Jefferson 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 Jefferson County during May?
Moderate rainfall is anticipated in Jefferson County during May, with a total of 50.2 mm spread over approximately 7 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Jefferson County during May?
The average wind speed in Jefferson County during May is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Jefferson County
Explore the daily rainfall trends and prepare for Jefferson Countys May weather 💧
UV exposure in Jefferson County during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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Where is Jefferson County?Get accurate weather forecasts for Jefferson County, located at latitude 41.009 and longitude -91.963. Stay updated with localized weather information tailored for Jefferson County.
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