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
September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's warm 78.4°F (25.8°C) to a pleasant 70.2°F (21.2°C). Throughout the nights in September, an average low-temperature of 49.8°F (9.9°C) is noted.Humidity
In September, the average relative humidity is 74%.Rainfall
In Royalton, in September, it is raining for 9.7 days, with typically 1.3" (33mm) of accumulated precipitation. Throughout the year, there are 109.2 rainfall days, and 17.64" (448mm) of precipitation is accumulated.Snowfall
In Royalton, snow does not fall in June through September.Daylight
In Royalton, the average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:39 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 6:58 pm CDT.
Sunshine
In September, the average sunshine is 8.8h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: In September, a regular UV index of 4 translates into these guidelines:
Act with care - Obligation to protect against skin and eye damage is highlighted. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Royalton have in September?
What is the UV index intensity in September?
Average temperature in September
Royalton, MN
- Average high temperature in September: 70.2°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (18.1°F).
- Average low temperature in September: 49.8°F
The month with the highest average low temperature is July (59.7°F).
The coldest month (with the lowest average low temperature) is January (4.8°F).
Average pressure in September
Royalton, MN
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Royalton, MN
- Average wind speed in September: 7.7mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in September
Royalton, MN
- Average humidity in September: 74%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is May (70%).
Average rainfall in September
Royalton, MN
- Average rainfall in September: 1.3"
The wettest month (with the highest rainfall) is June (3.15").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Royalton, MN
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is June (15.1 days).
The month with the least rainy days is February (2.5 days).
Average snowfall in September
Royalton, MN
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Royalton, MN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (17.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Royalton, MN
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in September
Royalton, MN
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is September (18.5 days).
The month with the least sunshine days is June (12.7 days).
Average UV index in September
Royalton, 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
Royalton, MN
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Royalton, 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).
Royalton, Minnesota, USA
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