Last updated: June 24, 2025
In August, the average temperature in Waterloo, United States hovers around 22°C (71°F), with a minimum dipping to 8°C (46°F) and a maximum soaring up to 33°C (92°F). Expect about 96 mm (3.8 in) of precipitation spread over 11 days, resulting in an average humidity of 76%. Whether you're planning outdoor activities or cozy indoor retreats, be prepared for a mix of warm days and occasional rain!
In August in Waterloo, the average temperature is 22°C (71°F). Maximums can reach 33°C (92°F) and minimums can be as low as 8°C (46°F). This pleasant climate makes it an ideal destination for travelers seeking a variety of outdoor activities.
In Waterloo in August, the precipitation amount is 96 mm (3.8 in) spread over 11 days, resulting in a significant accumulation of rainfall.
In Waterloo in August, humidity is 76%. With an average temperature of 22°C (71°F), this humidity feels like traveling through a warm, dense mist that clings to your skin, making every step feel heavier and the air seem thicker, which can be quite draining for outdoor activities.
In Waterloo in August, 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 August’s weather to other months in Waterloo, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (22°F) | 51 mm (2.0 inches) | 85% | moderate |
| February Weather | -5°C (22°F) | 51 mm (2.0 inches) | 85% | moderate |
| March Weather | 2°C (36°F) | 57 mm (2.3 inches) | 85% | moderate |
| April Weather | 8°C (46°F) | 100 mm (4.0 inches) | 85% | very high |
| May Weather | 15°C (59°F) | 125 mm (4.9 inches) | 78% | very high |
| June Weather | 21°C (70°F) | 114 mm (4.5 inches) | 80% | very high |
| July Weather | 23°C (75°F) | 102 mm (4.0 inches) | 78% | very high |
| August Weather | 22°C (71°F) | 96 mm (3.8 inches) | 76% | very high |
| September Weather | 18°C (65°F) | 102 mm (4.0 inches) | 79% | very high |
| October Weather | 11°C (51°F) | 115 mm (4.5 inches) | 83% | moderate |
| November Weather | 2°C (37°F) | 43 mm (1.7 inches) | 88% | moderate |
| December Weather | -2°C (29°F) | 46 mm (1.8 inches) | 81% | low |