Last updated: June 24, 2025
The average temperature in Gillette, United States during May is a cool 12°C (53°F). However, temperatures can vary significantly, with a minimum of -3°C (28°F) and a maximum reaching 33°C (91°F). Expect about 67 mm (2.6 in) of precipitation spread over 14 days, and the air is typically quite damp, with an average humidity of 75%.
In May in Gillette, the average temperature is 12°C (53°F), with maximums reaching up to 33°C (91°F) and minimums dropping as low as -3°C (28°F). This temperature range suggests that travelers should be prepared for both warm days and chilly nights, making versatile clothing essential for enjoying all that Gillette has to offer.
In Gillette in May, the precipitation amount is 67 mm (2.6 in) spread over 14 days.
In Gillette in May, humidity is 75%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that clings to your skin, making leisurely exploration feel sluggish and heavy, perhaps leaving you yearning for cozy indoor retreats.
In Gillette 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 Gillette.
UV Risk Categories
Weather in Gillette varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Gillette, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 19 mm (0.8 inches) | 78% | moderate |
| February Weather | -5°C (23°F) | 26 mm (1.0 inches) | 79% | moderate |
| March Weather | 3°C (38°F) | 33 mm (1.3 inches) | 71% | high |
| April Weather | 6°C (42°F) | 61 mm (2.4 inches) | 70% | very high |
| May Weather | 12°C (53°F) | 67 mm (2.6 inches) | 75% | very high |
| June Weather | 19°C (67°F) | 39 mm (1.6 inches) | 82% | extreme |
| July Weather | 23°C (74°F) | 56 mm (2.2 inches) | 84% | extreme |
| August Weather | 21°C (71°F) | 35 mm (1.4 inches) | 85% | very high |
| September Weather | 16°C (62°F) | 43 mm (1.7 inches) | 79% | very high |
| October Weather | 6°C (44°F) | 47 mm (1.9 inches) | 75% | moderate |
| November Weather | 3°C (37°F) | 20 mm (0.8 inches) | 75% | moderate |
| December Weather | -1°C (30°F) | 24 mm (0.9 inches) | 81% | low |