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 7 rainy days and a total precipitation of 61.2 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
70 %
Avg humidity
Waterloo Weather May
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Temperatures trend during May in Waterloo
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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 7 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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