Last updated: June 24, 2025
In Mason City, United States, the average temperature in May is a comfortable 15°C (60°F), with a minimum dipping to 0°C (32°F) and a maximum reaching up to 35°C (95°F). Be prepared for some rainfall, as the area experiences an average precipitation of 159 mm (6.3 in) spread over 15 days. Humidity levels hover around a moderate 74%, adding to the region's unique climate experience.
In May in Mason City, the average temperature is 15°C (60°F), with maximums reaching 35°C (95°F) and minimums dropping as low as 0°C (32°F). Be sure to pack layers to accommodate the wide temperature range and enjoy all that Mason City has to offer!
In Mason City in May, the precipitation amount is 159 mm (6.3 in) over a span of 15 days.
In Mason City in May humidity is 74%. With an average temperature of 15°C (60°F), this humidity feels like a warm embrace that can make outdoor activities feel slightly stifling, so travelers should be prepared to hydrate frequently and take breaks in the shade.
In Mason City 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 Mason City.
UV Risk Categories
Weather in Mason City varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Mason City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (19°F) | 36 mm (1.4 inches) | 82% | moderate |
| February Weather | -8°C (18°F) | 47 mm (1.9 inches) | 84% | moderate |
| March Weather | 1°C (35°F) | 71 mm (2.8 inches) | 80% | moderate |
| April Weather | 7°C (45°F) | 80 mm (3.1 inches) | 81% | very high |
| May Weather | 15°C (60°F) | 159 mm (6.3 inches) | 74% | very high |
| June Weather | 22°C (72°F) | 132 mm (5.2 inches) | 80% | extreme |
| July Weather | 23°C (74°F) | 98 mm (3.8 inches) | 80% | very high |
| August Weather | 21°C (71°F) | 118 mm (4.7 inches) | 77% | very high |
| September Weather | 18°C (65°F) | 108 mm (4.2 inches) | 75% | very high |
| October Weather | 10°C (49°F) | 112 mm (4.4 inches) | 80% | moderate |
| November Weather | 1°C (35°F) | 49 mm (1.9 inches) | 87% | moderate |
| December Weather | -3°C (27°F) | 35 mm (1.4 inches) | 83% | moderate |