Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
As May sets, the average high-temperature shows an increase, moving up from a cool 11.8°C (53.2°F) in April to a comfortable 17.3°C (63.1°F). An average nighttime temperature of 7.4°C (45.3°F) is witnessed throughout May.Humidity
In May, the average relative humidity is 64%.Rainfall
The month with the most rainfall is May, when the rain falls for 17.1 days and typically aggregates up to 58mm (2.28") of precipitation.Snowfall
Months with snowfall are January through May, September through December. May is the last month it regularly snows. During 1.3 snowfall days, in May, Rapid City aggregates 37mm (1.46") of snow. In Rapid City, during the entire year, snow falls for 50.4 days and aggregates up to 620mm (24.41") of snow.Daylight
The average length of the day in May is 14h and 47min.On the first day of May, sunrise is at 5:42 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 5:12 am and sunset at 8:28 pm MDT.
Sunshine
In Rapid City, the average sunshine in May is 10.1h.UV index
The average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In May, a regular UV index of 5 translates into these guidelines:
Ensure safety - Sun damage prevention is strongly urged. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in May?
What is the average humidity in May?
What is the wettest month?
How much does it rain in May?
What is the last month it snows?
How many hours of daylight does Rapid City have in May?
When are sunrise and sunset in May?
How many hours of sunshine does Rapid City have in May?
What is the UV index intensity in May?
Average temperature in May
Rapid City, SD
- Average high temperature in May: 17.3°C
The warmest month (with the highest average high temperature) is July (29.3°C).
The month with the lowest average high temperature is December (0.3°C).
- Average low temperature in May: 7.4°C
The month with the highest average low temperature is July (17.4°C).
The coldest month (with the lowest average low temperature) is February (-7.9°C).
Average pressure in May
Rapid City, SD
- Average pressure in May: 1012.8mbar
The month with the highest atmospheric pressure is January (1020.5mbar).
The month with the lowest atmospheric pressure is June (1010.6mbar).
Average wind speed in May
Rapid City, SD
- Average wind speed in May: 15.8km/h
The windiest month (with the highest average wind speed) is April (16.5km/h).
The calmest month (with the lowest average wind speed) is August (13.2km/h).
Average humidity in May
Rapid City, SD
- Average humidity in May: 64%
The month with the highest relative humidity is January (77%).
The months with the lowest relative humidity are August and September (50%).
Average rainfall in May
Rapid City, SD
- Average rainfall in May: 58mm
The wettest month (with the highest rainfall) is May (58mm).
The driest month (with the least rainfall) is January (11mm).
Average rainfall days in May
Rapid City, SD
- Average rainfall days in May: 17.1 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is December (4.8 days).
Average snowfall in May
Rapid City, SD
- Average snowfall in May: 37mm
The month with the highest snowfall is April (138mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in May
Rapid City, SD
- Average snowfall days in May: 1.3 days
The month with the highest number of snowfall days is February (10.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Rapid City, SD
- Average daylight in May: 14h and 5min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in May: 10h and 1min
The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 54min).
Average sunshine days in May
Rapid City, SD
- Average sunshine days in May: 11 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (11 days).
Average UV index in May
Rapid City, SD
- Average UV index in May: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Rapid City, SD
- Average cloud cover in May: 34
The months with the most cloud cover are February and April (Cloud cover 38).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in May
Rapid City, SD
- Average visibility in May: 9km
The months with the highest visibility are June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April, May, November and December (9km).
Rapid City, South Dakota, USA
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