September weather forecastPlymouth, MI
September
Weather in September
September, the first month of the autumn in Plymouth, is also an agreeable month, with temperature in the range of an average low of 55.4°F (13°C) and an average high of 72.5°F (22.5°C).Temperature
A mild drop in Plymouth's average high-temperature is observed in September, transitioning from a moderately hot 78.4°F (25.8°C) in August to a pleasant 72.5°F (22.5°C). The average temperature drops to a refreshing 55.4°F (13°C) during the night in the month of September.Humidity
In Plymouth, the average relative humidity in September is 77%.Rainfall
In September, the rain falls for 10.9 days. Throughout September, 0.83" (21mm) of precipitation is accumulated. Throughout the year, there are 123.8 rainfall days, and 11.73" (298mm) of precipitation is accumulated.Snowfall
In Plymouth, snow does not fall in May through October.Daylight
In Plymouth, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:59 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 7:16 pm EDT.
Sunshine
The average sunshine in September is 8.1h.UV index
The average daily maximum UV index in September in Plymouth is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The UV index of 4 in September translates into these instructions:
Exercise prevention - Warding off sunburn is urged. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Plymouth, MI
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (28.4°F).
- Average low temperature in September: 55.4°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).
Average pressure in September
Plymouth, MI
- Average pressure in September: 30.04"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
Plymouth, MI
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in September
Plymouth, MI
- Average humidity in September: 77%
The months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Plymouth, MI
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is May (1.69").
The driest month (with the least rainfall) is December (0.51").
Average rainfall days in September
Plymouth, MI
- Average rainfall days in September: 10.9 days
The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in September
Plymouth, MI
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.97").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Plymouth, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Plymouth, MI
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Plymouth, MI
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is October (18.6 days).
The month with the least sunshine days is April (13 days).
Average UV index in September
Plymouth, MI
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Plymouth, MI
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in September
Plymouth, MI
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
