September weather forecastGrawn, MI
September
Weather in September
September, the first month of the autumn in Grawn, is still a comfortable month, with an average temperature fluctuating between 67.5°F (19.7°C) and 54°F (12.2°C).Temperature
As August makes way for September, Grawn's average high-temperature eases from a moderately hot 73.6°F (23.1°C) to a refreshing 67.5°F (19.7°C). An average minimum temperature of 54°F (12.2°C) is recorded during the month of September.Humidity
The average relative humidity in September is 78%.Rainfall
In Grawn, Michigan, in September, during 8.9 rainfall days, 0.51" (13mm) of precipitation is typically accumulated. In Grawn, during the entire year, the rain falls for 94.8 days and collects up to 8.35" (212mm) of precipitation.Snowfall
In Grawn, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 7:06 am and sunset at 8:18 pm. On the last day of September, sunrise is at 7:40 am and sunset at 7:24 pm EDT.
Sunshine
In Grawn, the average sunshine in September is 8.1h.UV index
In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: In September, the maximum UV index of 3 suggests this advice:
Heed the precautions - Suggestions to avoid sunburn are made. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grawn, MI
- Average high temperature in September: 67.5°F
The warmest month (with the highest average high temperature) is August (73.6°F).
The month with the lowest average high temperature is January (25.7°F).
- Average low temperature in September: 54°F
The month with the highest average low temperature is August (59.5°F).
The coldest months (with the lowest average low temperature) are January and February (18.1°F).
Average pressure in September
Grawn, MI
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Grawn, MI
- Average wind speed in September: 8.9mph
The windiest months (with the highest average wind speed) are January and December (12mph).
The calmest month (with the lowest average wind speed) is July (7.4mph).
Average humidity in September
Grawn, MI
- Average humidity in September: 78%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and May (77%).
Average rainfall in September
Grawn, MI
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is May (0.98").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days in September
Grawn, MI
- Average rainfall days in September: 8.9 days
The month with the highest number of rainy days is May (11.5 days).
The month with the least rainy days is February (2.1 days).
Average snowfall in September
Grawn, MI
- Average snowfall in September: 0"
The months with the highest snowfall are January and November (2.2").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Grawn, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grawn, MI
- 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: 8h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 1h and 48min).
Average sunshine days in September
Grawn, MI
- Average sunshine days in September: 18.2 days
The month with the most sunshine days is March (18.8 days).
The month with the least sunshine days is February (14.6 days).
Average UV index in September
Grawn, MI
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Grawn, MI
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 82).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in September
Grawn, MI
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
