September weather forecastGrasston, MN
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Grasston, Minnesota, with an average temperature ranging between max 69.4°F (20.8°C) and min 50.5°F (10.3°C).Temperature
September's arrival comes with a mild decrease in the average high-temperature, moving subtly from a moderately hot 77.4°F (25.2°C) in August to an agreeable 69.4°F (20.8°C). Nighttime temperatures in September average to a fresh 50.5°F (10.3°C).Humidity
In September, the average relative humidity is 76%.Rainfall
In Grasston, in September, during 10.9 rainfall days, 1.69" (43mm) of precipitation is typically accumulated. In Grasston, Minnesota, during the entire year, the rain falls for 116.6 days and collects up to 20.71" (526mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:34 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:54 pm CDT.
Sunshine
In Grasston, Minnesota, the average sunshine in September is 8.7h.UV index
In September, the average daily maximum UV index in Grasston is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: The UV index of 4 in September translates into these instructions:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grasston, MN
- Average high temperature in September: 69.4°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (18.1°F).
- Average low temperature in September: 50.5°F
The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is January (5.2°F).
Average pressure in September
Grasston, MN
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is February (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Grasston, MN
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
Grasston, MN
- Average humidity in September: 76%
The month with the highest relative humidity is January (91%).
The months with the lowest relative humidity are April and May (72%).
Average rainfall in September
Grasston, MN
- Average rainfall in September: 1.69"
The wettest month (with the highest rainfall) is June (3.39").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in September
Grasston, MN
- Average rainfall days in September: 10.9 days
The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is January (1.8 days).
Average snowfall in September
Grasston, MN
- Average snowfall in September: 0"
The month with the highest snowfall is December (5.55").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Grasston, MN
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grasston, MN
- Average daylight in September: 12h and 30min
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 42min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in September
Grasston, MN
- Average sunshine days in September: 17.4 days
The months with the most sunshine days are January and November (18.1 days).
The month with the least sunshine days is June (10.9 days).
Average UV index in September
Grasston, 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
Grasston, MN
- Average cloud cover in September: 36
The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in September
Grasston, MN
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
