September weather forecastPlymouth, MN
September
Weather in September
In September, fall starts rolling in Plymouth, causing temperatures to start dwindling. Plymouth experiences cooler weather, with temperatures dropping to a maximum of 71.2°F (21.8°C). Alongside decreasing temperatures, daylight hours also start to shrink. Despite the reduced rainfall, the onset of fall brings with it richness in terms of vibrant autumn colors. Fall activities and festivals start filling in the calendars of Plymouth residents.Temperature
In the transition to September, Plymouth observes a minor drop in the average high-temperature, shifting from a warm 78.6°F (25.9°C) in August to a pleasant 71.2°F (21.8°C). Plymouth witnesses a consistent average low-temperature of 53.6°F (12°C) throughout September.Humidity
The average relative humidity in September is 73%.Rainfall
In Plymouth, during September, the rain falls for 11.4 days and regularly aggregates up to 1.54" (39mm) of precipitation. In Plymouth, during the entire year, the rain falls for 113.9 days and collects up to 20.24" (514mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Plymouth, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:11 am and sunset at 6:55 pm CDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
In Plymouth, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: During September, 4 as the daily maximum UV index converts into the following advice:
Heed the precautions - Suggestions to avoid sunburn are made. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Plymouth, MN
- Average high temperature in September: 71.2°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (20.1°F).
- Average low temperature in September: 53.6°F
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (7.5°F).
Average pressure in September
Plymouth, MN
- Average pressure in September: 30"Hg
The months with the highest atmospheric pressure are January and February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Plymouth, MN
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is April (9.2mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in September
Plymouth, MN
- Average humidity in September: 73%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are April and May (70%).
Average rainfall in September
Plymouth, MN
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is June (3.35").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
Plymouth, MN
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is June (16.3 days).
The month with the least rainy days is January (1.9 days).
Average snowfall in September
Plymouth, MN
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.45").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Plymouth, MN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.7 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, MN
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Plymouth, MN
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is June (10.9 days).
Average UV index in September
Plymouth, MN
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Plymouth, MN
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 68).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility in September
Plymouth, MN
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
