May Weather in Great Falls

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%.

8°C (47°F)

Minimum temperature

22°C (72°F)

Average temperature

34°C (93°F)

Maximum temperature

83%

Humidity

Precipitation and Sunshine hours

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.

112 mm (4.4 inches)

Precipitation

10 rainy days

Rainy days

9 hours 47 minutes

Sunshine hours

39%

Chance of sun

UV Index

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.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  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

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