September weather forecastSaint Helen, MI
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Saint Helen, Michigan, with an average temperature fluctuating between 50.9°F (10.5°C) and 69.8°F (21°C).Temperature
The beginning of September brings a minor change in the average high-temperature, shifting from a moderately hot 77.2°F (25.1°C) in August to an agreeable 69.8°F (21°C). In Saint Helen, an average low-temperature of 50.9°F (10.5°C) is recorded during September nights.Humidity
In September, the average relative humidity is 79%.Rainfall
September is the month with the least rainfall in Saint Helen. Rain falls for 11.5 days and accumulates 0.98" (25mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Saint Helen, the average length of the day in September is 12h and 30min.On the first day of the month, sunrise is at 7:01 am and sunset at 8:13 pm. On the last day of September, sunrise is at 7:35 am and sunset at 7:19 pm EDT.
Sunshine
In September, the average sunshine is 8h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In September, the average maximum UV index of 3 translates into the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. The solar radiation around mid-day is intense; avoid the Sun and stay safe. 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
Saint Helen, MI
- Average high temperature in September: 69.8°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (25.2°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is July (58.3°F).
The coldest month (with the lowest average low temperature) is January (15.4°F).
Average pressure in September
Saint Helen, 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
Saint Helen, MI
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).
Average humidity in September
Saint Helen, MI
- Average humidity in September: 79%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is May (72%).
Average rainfall in September
Saint Helen, MI
- Average rainfall in September: 0.98"
The wettest months (with the highest rainfall) are May and October (2.68").
The driest month (with the least rainfall) is September (0.98").
Average rainfall days in September
Saint Helen, MI
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is October (16.3 days).
The month with the least rainy days is February (4.4 days).
Average snowfall in September
Saint Helen, MI
- Average snowfall in September: 0"
The month with the highest snowfall is January (8.03").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Saint Helen, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (21 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Saint Helen, 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 0min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 12min).
Average sunshine days in September
Saint Helen, MI
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is September (16.4 days).
The month with the least sunshine days is February (8.8 days).
Average UV index in September
Saint Helen, 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, November and December (UV index 1).
Average cloud cover in September
Saint Helen, MI
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 77).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Saint Helen, MI
- Average visibility in September: 5mi
The months with the highest visibility are April, May, June, July, October and November (6mi).
The month with the lowest visibility is January (4mi).
