September weather forecastGrandville, MI
September
Weather in September
September, the first month of the autumn in Grandville, is still a pleasant month, with an average temperature varying between 72.5°F (22.5°C) and 54.1°F (12.3°C).Temperature
The start of September involves a subtle temperature drop, shifting from a moderately hot 78.4°F (25.8°C) in August to a pleasant 72.5°F (22.5°C). Grandville records an average low of 54.1°F (12.3°C) throughout the nights in September.Humidity
In Grandville, Michigan, the average relative humidity in September is 78%.Rainfall
In Grandville, during September, the rain falls for 11.9 days and regularly aggregates up to 1.81" (46mm) of precipitation. Throughout the year, there are 143.3 rainfall days, and 24.06" (611mm) of precipitation is accumulated.Snowfall
In Grandville, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 7:08 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 7:25 pm EDT.
Sunshine
The average sunshine in September is 8.3h.UV index
In Grandville, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index of 4 during September translates into these guidelines:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grandville, MI
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in September: 54.1°F
The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in September
Grandville, 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 (29.92"Hg).
Average wind speed in September
Grandville, MI
- Average wind speed in September: 7.4mph
The windiest months (with the highest average wind speed) are February and April (9.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in September
Grandville, MI
- Average humidity in September: 78%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Grandville, MI
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is October (2.8").
The driest month (with the least rainfall) is November (1.42").
Average rainfall days in September
Grandville, MI
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is October (16.5 days).
The month with the least rainy days is February (4.7 days).
Average snowfall in September
Grandville, MI
- Average snowfall in September: 0"
The month with the highest snowfall is January (6.26").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Grandville, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (19 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grandville, 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: 8h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in September
Grandville, MI
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is September (15.6 days).
The month with the least sunshine days is January (8.3 days).
Average UV index in September
Grandville, MI
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Grandville, MI
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 75).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in September
Grandville, MI
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
