Last updated: March 2, 2024
The weather in Great Falls, United States, during May is characterized by an average temperature of 22°C (72°F). Highs can soar to 34°C (93°F), while lows may dip to 8°C (47°F). Typically, the humidity level in Great Falls throughout May hovers around 83%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In May, Great Falls averages 112 mm (4.4 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 13 hours 58 minutes of daylight, with the sun shining for approximately 9 hours 47 minutes each day. Additionally, there is a 39% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In May, the UV Index in Great Falls reaches a maximum of 10, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 1 | 3 | 5 | 7 | 9 | 10 | 10 | 9 | 6 | 4 | 2 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||