Last updated: June 24, 2025
In April, the average temperature in Waterloo, United States hovers around 13°C (56°F). Travelers should be prepared for a range of temperatures, with lows dipping to -4°C (26°F) and highs soaring up to 31°C (88°F). Expect about 142 mm (5.6 in) of precipitation over 12 days, contributing to an average humidity of 80%. Whether you're braving the chill or enjoying the warmth, this month offers a diverse climate experience!
In April in Waterloo, the average temperature is 13°C (56°F). The maximum can reach 31°C (88°F), and the minimum can be as low as -4°C (26°F). Overall, this weather offers a diverse range of temperatures, making it important for travelers to pack accordingly for both warm and chilly conditions.
In Waterloo in April, the total precipitation amount is 142 mm (5.6 in), occurring over the course of 12 days.
In Waterloo in April humidity is 80%. With average temperature 13°C (56°F) this humidity feels like a damp chill that seeps into your bones, making outdoor exploration more challenging and necessitating layered clothing for comfort.
In Waterloo in April, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Waterloo.
UV Risk Categories
Weather in Waterloo varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in Waterloo, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 79 mm (3.1 inches) | 82% | moderate |
| February Weather | 3°C (37°F) | 87 mm (3.4 inches) | 80% | moderate |
| March Weather | 9°C (48°F) | 136 mm (5.4 inches) | 80% | high |
| April Weather | 13°C (56°F) | 142 mm (5.6 inches) | 80% | very high |
| May Weather | 20°C (68°F) | 149 mm (5.9 inches) | 82% | very high |
| June Weather | 25°C (77°F) | 87 mm (3.4 inches) | 83% | extreme |
| July Weather | 27°C (80°F) | 89 mm (3.5 inches) | 81% | very high |
| August Weather | 25°C (77°F) | 123 mm (4.8 inches) | 80% | very high |
| September Weather | 22°C (73°F) | 66 mm (2.6 inches) | 76% | very high |
| October Weather | 15°C (60°F) | 109 mm (4.3 inches) | 76% | high |
| November Weather | 7°C (45°F) | 75 mm (2.9 inches) | 85% | moderate |
| December Weather | 4°C (40°F) | 68 mm (2.7 inches) | 86% | moderate |