September weather forecastMason, MI
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Mason, Michigan, with an average temperature varying between 52.7°F (11.5°C) and 71.6°F (22°C).Temperature
The start of September involves a subtle temperature drop, shifting from a warm 77.5°F (25.3°C) in August to an agreeable 71.6°F (22°C). An average low-temperature of 52.7°F (11.5°C) is common during the nights of September.Humidity
In Mason, the average relative humidity in September is 79%.Rainfall
In Mason, in September, it is raining for 8.5 days, with typically 0.51" (13mm) of accumulated precipitation. Throughout the year, there are 96.4 rainfall days, and 7.32" (186mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 29min.On the first day of the month, sunrise is at 7:03 am and sunset at 8:11 pm. On the last day of September, sunrise is at 7:34 am and sunset at 7:20 pm EDT.
Sunshine
In Mason, the average sunshine in September is 7.9h.UV index
In Mason, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In September, a regular UV index of 3 translates into these guidelines:
Be vigilant - Suggestions to stave off sun damage are provided. Around midday, solar radiation is most harmful; hence, exposure should be limited. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mason, MI
- Average high temperature in September: 71.6°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 (27.7°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in September
Mason, MI
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Mason, MI
- Average wind speed in September: 7.3mph
The windiest months (with the highest average wind speed) are January, February and April (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in September
Mason, MI
- Average humidity in September: 79%
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
Mason, MI
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is May (0.94").
The driest month (with the least rainfall) is February (0.35").
Average rainfall days in September
Mason, MI
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is May (12.7 days).
The month with the least rainy days is February (3 days).
Average snowfall in September
Mason, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.14").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Mason, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Mason, 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 54min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 42min).
Average sunshine days in September
Mason, MI
- Average sunshine days in September: 18.4 days
The month with the most sunshine days is December (20.9 days).
The month with the least sunshine days is May (14.8 days).
Average UV index in September
Mason, 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
Mason, MI
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Mason, MI
- Average visibility in September: 5mi
The months with the highest visibility are February, March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are January, August and September (5mi).
