Rapid City
South Dakota, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Rapid City, SD

A scenic panoramic view of Rapid City in South Dakota, on a sunny and calm day, with intense tree cover spread out into the horizon, bright sky
A scenic panoramic view of Rapid City in South Dakota, on a sunny and calm day, with intense tree cover spread out into the horizon, bright sky
January, the same as December, is a wintry winter month in Rapid City, South Dakota, with temperature in the range of an average low of 12.9°F (-10.6°C) and an average high of 37°F (2.8°C). In Rapid City, the average high-temperature is relatively the same as in December - a still wintry 37°F (2.8°C). Weather in January »
The last month of the winter, February, is another cold month in Rapid City, South Dakota, with average temperature ranging between max 39.6°F (4.2°C) and min 15.1°F (-9.4°C). In Rapid City, the average high-temperature is relatively the same as in January - a still cold 39.6°F (4.2°C). Weather in February »

March, the first month of the spring, in Rapid City, is a chilly month, with average temperature varying between 22.8°F (-5.1°C) and 47.8°F (8.8°C). In Rapid City, the average high-temperature in March slightly increases, from a wintry 39.6°F (4.2°C) in February, to a frosty 47.8°F (8.8°C). Weather in March »

April in Rapid City, South Dakota, is a mild spring month, with temperature in the range of an average high of 58.3°F (14.6°C) and an average low of 31.8°F (-0.1°C). In April, the average high-temperature increases, from a chilly 47.8°F (8.8°C) in March, to a moderate 58.3°F (14.6°C). Weather in April »

May, the last month of the spring, in Rapid City, is a comfortable month, with average temperature varying between 67.8°F (19.9°C) and 42.1°F (5.6°C). In Rapid City, the average high-temperature rises, from a moderate 58.3°F (14.6°C) in April, to a comfortable 67.8°F (19.9°C). Weather in May »

The first month of the summer, June, is a warm month in Rapid City, South Dakota, with temperature in the range of an average high of 77.7°F (25.4°C) and an average low of 51.3°F (10.7°C). In Rapid City, the average high-temperature in June rises, from an enjoyable 67.8°F (19.9°C) in May, to a moderately hot 77.7°F (25.4°C). Weather in June »

July in Rapid City, South Dakota, is a hot summer month, with average temperature varying between 58.1°F (14.5°C) and 87.1°F (30.6°C). The warmest month is July, with an average high-temperature of 87.1°F (30.6°C) and an average low-temperature of 58.1°F (14.5°C). Weather in July »

The last month of the summer, August, is another hot month in Rapid City, South Dakota, with average temperature varying between 56.7°F (13.7°C) and 86.4°F (30.2°C). In August, the average high-temperature is relatively the same as in July - a still tropical 86.4°F (30.2°C). Weather in August »

The first month of the autumn, September, is also a moderately hot month in Rapid City, South Dakota, with average temperature varying between 46°F (7.8°C) and 75.6°F (24.2°C). In Rapid City, the average high-temperature drops, from a hot 86.4°F (30.2°C) in August, to a warm 75.6°F (24.2°C). Weather in September »

October, like September, in Rapid City, South Dakota, is another comfortable autumn month, with average temperature fluctuating between 61.3°F (16.3°C) and 34.2°F (1.2°C). In October, the average high-temperature decreases, from a moderately hot 75.6°F (24.2°C) in September, to an enjoyable 61.3°F (16.3°C). Weather in October »

November, the last month of the autumn, in Rapid City, is another chilly month, with average temperature ranging between max 46.9°F (8.3°C) and min 22.1°F (-5.5°C). In November, the average high-temperature declines considerably, from an enjoyable 61.3°F (16.3°C) in October, to a chilly 46.9°F (8.3°C). Weather in November »

December, the first month of the winter, in Rapid City, is still a cold month, with average temperature ranging between min 12.9°F (-10.6°C) and max 36.9°F (2.7°C). The coldest month is December, with an average high-temperature of 36.9°F (2.7°C) and an average low-temperature of 12.9°F (-10.6°C). Weather in December »

How many days does it rain in Rapid City?

Throughout the year, there are 94.3 rainfall days, and 16.3" (413.9mm) of precipitation is accumulated.

What is the driest month in Rapid City?

The month with the least rainfall is January when the rain falls for 5.4 days and typically collects 0.3" (7.6mm) of precipitation.

When does it snow in Rapid City?

January through May, September through December are months with snowfall in Rapid City.

How many days does it snow in Rapid City?

Throughout the year, in Rapid City, there are 33.1 snowfall days, and 41.1" (1044mm) of snow is accumulated.

What are the months with the lowest UV index in Rapid City?

January and December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the most humid month in Rapid City?

February is the most humid month in Rapid City, with an average relative humidity of 65.1%.

When does it snow the most in Rapid City?

The month with the most snowfall is March when snow falls for 5.3 days and typically aggregates up to 8.7" (221mm) of snow.

What is the rainiest month in Rapid City?

The month with the most rainfall in Rapid City, South Dakota, is May when the rain falls for 11.7 days and typically aggregates up to 3.2" (81.8mm) of precipitation.

When are the longest days in Rapid City?

June has the longest days of the year, with an average of 15.4h of daylight.

What are the months with the highest UV index in Rapid City?

Months with the highest UV index in Rapid City are June and July, with an average maximum UV index of 9.

What is the warmest month in Rapid City?

The warmest month in Rapid City, South Dakota, is July, with an average high-temperature of 87.1°F (30.6°C) and an average low-temperature of 58.1°F (14.5°C).

What month has the most sunshine in Rapid City?

July has the most sunshine of the year in Rapid City, with an average of 10.8h of sunshine.

What is the least humid month in Rapid City?

The least humid month in Rapid City is August, with an average relative humidity of 52.6%.

What is the coldest month in Rapid City?

December is the coldest month in Rapid City, South Dakota, with an average high-temperature of 36.9°F (2.7°C) and an average low-temperature of 12.9°F (-10.6°C).

What is the month with the shortest days in Rapid City?

With an average of 8.9h of daylight, December has the shortest days of the year in Rapid City.

What is the month with the least sunshine in Rapid City?

The month with the least sunshine in Rapid City, South Dakota, is December, with an average of 4.8h of sunshine.
Average temperature - Rapid City, SD
Average humidity - Rapid City, SD

The month with the highest relative humidity is February (65.1%).
The month with the lowest relative humidity is August (52.6%).

Average rainfall - Rapid City, SD
Average rainfall days - Rapid City, SD

The month with the highest number of rainy days is June (12.3 days).
The month with the lowest number of rainy days is November (5.3 days).

Average snowfall days - Rapid City, SD

Months with the highest number of snowfall days are February and December (5.8 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

Average daylight / Average sunshine - Rapid City, SD