September weather forecastGrand Blanc, MI
September
Weather in September
September, the first month of the autumn in Grand Blanc, is still a pleasant month, with temperature in the range of an average low of 53.1°F (11.7°C) and an average high of 71.1°F (21.7°C).Temperature
In September, the average high-temperature marginally decreases from a warm 77.4°F (25.2°C) in August to a pleasant 71.1°F (21.7°C). Throughout the month of September, the average temperature in Grand Blanc dips to a cool 53.1°F (11.7°C) at night.Humidity
The average relative humidity in September in Grand Blanc is 80%.Rainfall
September and December are months with the least rain when the rain falls for 13.7 days and typically aggregates up to 1.57" (40mm) of rain.Snowfall
June through September are months without snowfall in Grand Blanc.Daylight
In September, the average length of the day in Grand Blanc is 12h and 29min.On the first day of the month, sunrise is at 6:59 am and sunset at 8:08 pm. On the last day of September, in Grand Blanc, sunrise is at 7:31 am and sunset at 7:17 pm EDT.
Sunshine
In September, the average sunshine is 7.8h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Guard yourself - Avoiding sunburn is suggested. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grand Blanc, MI
- Average high temperature in September: 71.1°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (27.1°F).
- Average low temperature in September: 53.1°F
The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in September
Grand Blanc, MI
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Grand Blanc, MI
- Average wind speed in September: 7.3mph
The windiest months (with the highest average wind speed) are January and February (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in September
Grand Blanc, MI
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is April (77%).
Average rainfall in September
Grand Blanc, MI
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is May (3.03").
The driest months (with the least rainfall) are September and December (1.57").
Average rainfall days in September
Grand Blanc, MI
- Average rainfall days in September: 13.7 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in September
Grand Blanc, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (6.14").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Grand Blanc, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (18 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grand Blanc, MI
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 7h and 48min
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 48min).
Average sunshine days in September
Grand Blanc, MI
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is September (14.2 days).
The month with the least sunshine days is January (8.4 days).
Average UV index in September
Grand Blanc, MI
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Grand Blanc, MI
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Grand Blanc, MI
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, July, August, October and November (6mi).
The months with the lowest visibility are January, February, September and December (5mi).
