Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The arrival of September signals a subtle shift in temperature, down from a moderately hot 77.5°F (25.3°C) in August to an agreeable 71.1°F (21.7°C). Castle Rock, during the nights of September, experiences an average temperature drop to a fresh 52.5°F (11.4°C).Humidity
In September, the average relative humidity is 77%.Rainfall
In Castle Rock, in September, during 11.3 rainfall days, 2.13" (54mm) of precipitation is typically accumulated. In Castle Rock, during the entire year, the rain falls for 126.4 days and collects up to 24.76" (629mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 30min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:48 pm. On the last day of September, sunrise is at 7:10 am and sunset at 6:54 pm CDT.
Sunshine
The average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, a regular UV index of 4 translates into these guidelines:
Be vigilant - A duty to shield skin and eyes from injury exists. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Frequently asked questions
What are September temperatures in Castle Rock?
What is the average humidity in September in Castle Rock?
How many days does it rain in September in Castle Rock?
When it does not snow in Castle Rock?
Does it snow in Castle Rock in September?
What is the average length of the day in September in Castle Rock?
What time are sunrise and sunset in September in Castle Rock?
How long on average sun shines in September in Castle Rock?
How high is the UV index in September in Castle Rock?
Average temperature in September
Castle Rock, MN
- Average high temperature in September: 71.1°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (20.8°F).
- Average low temperature in September: 52.5°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (7.7°F).
Average pressure in September
Castle Rock, MN
- Average pressure in September: 30"Hg
The months with the highest atmospheric pressure are January and February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Castle Rock, MN
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is April (9.5mph).
The calmest month (with the lowest average wind speed) is July (7mph).
Average humidity in September
Castle Rock, MN
- Average humidity in September: 77%
The month with the highest relative humidity is January (91%).
The months with the lowest relative humidity are April and October (73%).
Average rainfall in September
Castle Rock, MN
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is June (4.21").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days in September
Castle Rock, MN
- Average rainfall days in September: 11.3 days
The month with the highest number of rainy days is June (17.4 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in September
Castle Rock, MN
- Average snowfall in September: 0"
The month with the highest snowfall is February (6.1").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Castle Rock, MN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Castle Rock, MN
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Castle Rock, MN
- Average sunshine days in September: 16.1 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is June (10.2 days).
Average UV index in September
Castle Rock, MN
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Castle Rock, MN
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 68).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in September
Castle Rock, MN
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
Castle Rock, Minnesota, USA
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