Waterloo (IA)
May
Weather in Waterloo, Iowa for May 2026
Your guide to Waterloo weather in May - trends and predictions
In general, the average temperature in Waterloo at the beginning of May is 18.9 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 21.3 °F by the end of May.
Waterloo experiences moderate rainfall in May, with an average of 10 rainy days and a total precipitation of 61.2 mm.
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Temperatures
Rain 🌧️
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21
Dry days
10
Rainy days
0
Snow days
21°/10°
Temperatures
20 km/h
Avg max wind
70 %
Avg humidity
Waterloo Weather May
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Temperatures trend during May in Waterloo
See the weather trend as well as the moving average line
May weather in Waterloo day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Patchy rain possible | 17° /10° | 6.3 mm | 4 | |
| May 2 |  Overcast | 15° /9° | 0 mm | 3 | |
| May 3 | Patchy rain possible | 16° /6° | 0.5 mm | 4 | |
| May 4 | Overcast | 20° /5° | 0 mm | 5 | |
| May 5 | Overcast | 19° /6° | 0 mm | 4 | |
| May 6 | Overcast | 21° /9° | 0 mm | 5 | |
| May 7 |  Moderate or heavy rain shower | 24° /12° | 5.1 mm | 5 | |
| May 8 |  Partly cloudy | 18° /6° | 0 mm | 5 | |
| May 9 |  Sunny | 22° /5° | 0 mm | 6 | |
| May 10 | Sunny | 26° /10° | 0 mm | 7 | |
| May 11 | Sunny | 26° /9° | 0 mm | 7 | |
| May 12 | Overcast | 26° /10° | 0 mm | 6 | |
| May 13 | Overcast | 25° /15° | 0 mm | 6 | |
| May 14 | Overcast | 27° /15° | 0 mm | 6 | |
| May 15 | Patchy rain possible | 28° /17° | 2.6 mm | 6 | |
| May 16 | Patchy rain possible | 23° /12° | 0.5 mm | 5 | |
| May 17 | Overcast | 16° /8° | 0 mm | 4 | |
| May 18 |  Cloudy | 20° /6° | 0 mm | 5 | |
| May 19 | Moderate rain at times | 17° /9° | 12.4 mm | 4 | |
| May 20 | Moderate or heavy rain shower | 18° /8° | 22 mm | 4 | |
| May 21 | Patchy rain possible | 11° /8° | 3.2 mm | 3 | |
| May 22 | Patchy rain possible | 17° /6° | 0.3 mm | 4 | |
| May 23 | Overcast | 18° /8° | 0 mm | 4 | |
| May 24 | Overcast | 18° /11° | 0.1 mm | 4 | |
| May 25 |  Mist | 19° /10° | 0 mm | 4 | |
| May 26 | Overcast | 18° /8° | 0 mm | 4 | |
| May 27 | Overcast | 16° /12° | 0 mm | 4 | |
| May 28 | Light rain shower | 20° /12° | 8.2 mm | 5 | |
| May 29 | Fog | 20° /11° | 0 mm | 5 | |
| May 30 | Sunny | 26° /12° | 0 mm | 7 | |
| May 31 | Cloudy | 30° /13° | 0 mm | 7 | |
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Important Notice
Our weather forecast for Waterloo 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 Waterloo forecast closer to your planned date for the most up-to-date weather information.
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Waterloo in May - FAQ
What are the expected maximum and minimum temperatures in Waterloo 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 Waterloo during May?
Moderate rainfall is anticipated in Waterloo during May, with a total of 61.2 mm spread over approximately 10 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Waterloo during May?
The average wind speed in Waterloo during May is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Waterloo
Explore the daily rainfall trends and prepare for Waterloos May weather 💧
UV exposure in Waterloo during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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