September weather forecastGranite Falls, MN
September
Weather in September
As September arrives in Granite Falls, Minnesota, the weather starts leaning towards the fall, evident by the reducing daylight hours, now at an average of 12.5 hours. The temperature further recedes from 79.5°F (26.4°C) in August to an average high of 72.9°F (22.7°C). With the departure of summer rain showers, the city remains on the drier side. The first traces of fall colors can be seen with leaves changing their green guise to shades of red, orange, and yellow. It's a season marked by refreshing breezes, comfortable temperatures, and the start of the beautiful fall foliage.Temperature
September signals a slight drop in average high-temperature, sliding from August's moderately hot 79.5°F (26.4°C) to an agreeable 72.9°F (22.7°C). The average temperature drops to a fresh 52.9°F (11.6°C) during the night in the month of September.Humidity
The average relative humidity in September is 70%.Rainfall
In Granite Falls, during September, the rain falls for 9.4 days and regularly aggregates up to 1.18" (30mm) of precipitation. In Granite Falls, Minnesota, during the entire year, the rain falls for 101.9 days and collects up to 15.12" (384mm) of precipitation.Snowfall
In Granite Falls, snow does not fall in June through September.Daylight
In Granite Falls, the average length of the day in September is 12h and 31min.On the first day of September in Granite Falls, sunrise is at 6:45 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:03 pm CDT.
Sunshine
In September, the average sunshine is 9.1h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 during September translates into the following directions:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Granite Falls, MN
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (20.3°F).
- Average low temperature in September: 52.9°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (6.8°F).
Average pressure in September
Granite Falls, MN
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Granite Falls, MN
- Average wind speed in September: 8.8mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).
Average humidity in September
Granite Falls, MN
- Average humidity in September: 70%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is May (66%).
Average rainfall in September
Granite Falls, MN
- Average rainfall in September: 1.18"
The wettest months (with the highest rainfall) are June and July (2.4").
The driest months (with the least rainfall) are January and February (0.47").
Average rainfall days in September
Granite Falls, MN
- Average rainfall days in September: 9.4 days
The month with the highest number of rainy days is June (15.6 days).
The month with the least rainy days is February (2 days).
Average snowfall in September
Granite Falls, MN
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.07").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Granite Falls, MN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Granite Falls, MN
- Average daylight in September: 12h and 30min
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: 9h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Granite Falls, MN
- Average sunshine days in September: 18.9 days
The month with the most sunshine days is October (20.8 days).
The month with the least sunshine days is June (12 days).
Average UV index in September
Granite Falls, MN
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and November (UV index 1).
Average cloud cover in September
Granite Falls, MN
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in September
Granite Falls, MN
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
