Last updated: June 24, 2025
In May, the average temperature in Heron Lake, United States hovers around 15°C (59°F), making it a mild time of year. However, temperatures can vary significantly, with minimums dipping to 0°C (33°F) and maximums soaring up to 34°C (94°F). Expect 125 mm (4.9 in) of precipitation over 13 days, contributing to an average humidity of 74%. Whether you're enjoying the warmth or bracing for the rain, be prepared for an unpredictable climate!
In May in Heron Lake, the average temperature is 15°C (59°F). The maximum can reach 34°C (94°F), and the minimum can be as low as 0°C (33°F). It's advisable to pack layers to stay comfortable during your travels, as temperatures can vary significantly throughout the day.
In Heron Lake in May, the total precipitation amount is 125 mm (4.9 in), occurring over a span of 13 days.
In Heron Lake in May, humidity is 74%. With an average temperature of 15°C (59°F), this humidity feels like traveling through a warm, sticky blanket that clings to your skin, making outdoor activities a bit uncomfortable and prompting you to seek out shaded areas or cool breezes.
In Heron Lake in May, 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 Heron Lake.
UV Risk Categories
Weather in Heron Lake varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Heron Lake, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 31 mm (1.2 inches) | 80% | moderate |
| February Weather | -8°C (17°F) | 31 mm (1.2 inches) | 84% | moderate |
| March Weather | 1°C (34°F) | 68 mm (2.7 inches) | 75% | high |
| April Weather | 6°C (44°F) | 91 mm (3.6 inches) | 79% | very high |
| May Weather | 15°C (59°F) | 125 mm (4.9 inches) | 74% | very high |
| June Weather | 22°C (72°F) | 127 mm (5.0 inches) | 81% | extreme |
| July Weather | 23°C (74°F) | 102 mm (4.0 inches) | 82% | very high |
| August Weather | 21°C (70°F) | 115 mm (4.5 inches) | 80% | very high |
| September Weather | 18°C (65°F) | 110 mm (4.3 inches) | 75% | very high |
| October Weather | 9°C (48°F) | 92 mm (3.6 inches) | 77% | moderate |
| November Weather | 1°C (34°F) | 31 mm (1.2 inches) | 85% | moderate |
| December Weather | -4°C (25°F) | 41 mm (1.6 inches) | 83% | moderate |