September weather forecastRochester, MN
September
Weather in September
September marks the onset of fall in Rochester, accompanied by a gradual cooling from summer's peak. This is evident in a drop in temperatures, which averages a high of 70.7°F (21.5°C). The change from September to October will see a noticeable decrease in daylight hours, signaling the start of shorter days. September offers perfect fall conditions with a vibrant display of fall foliage transforming the city into a picturesque landscape.Temperature
The shift from August to September coincides with a small decrease in the average high-temperature, down to a pleasant 70.7°F (21.5°C) from a warm 76.6°F (24.8°C). An average temperature of 52°F (11.1°C) is recorded in Rochester during the nights in September.Humidity
The average relative humidity in September in Rochester is 79%.Rainfall
In September, in Rochester, the rain falls for 9.5 days. Throughout September, 1.3" (33mm) of precipitation is accumulated. Throughout the year, in Rochester, there are 109.7 rainfall days, and 16.57" (421mm) of precipitation is accumulated.Snowfall
In Rochester, 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 6:34 am and sunset at 7:45 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:51 pm CDT.
Sunshine
In September, the average sunshine in Rochester is 8.6h.UV index
The average daily maximum UV index in September in Rochester is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, a daily UV index of 4 turns into the following recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. The solar radiation around mid-day is intense; avoid the Sun and stay safe. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rochester, MN
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (20.7°F).
- Average low temperature in September: 52°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 (7.7°F).
Average pressure in September
Rochester, MN
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Rochester, MN
- Average wind speed in September: 8.6mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (7.5mph).
Average humidity in September
Rochester, MN
- Average humidity in September: 79%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Rochester, MN
- Average rainfall in September: 1.3"
The wettest month (with the highest rainfall) is June (3.11").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in September
Rochester, MN
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is June (15.3 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in September
Rochester, MN
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.09").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Rochester, MN
- 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
Rochester, MN
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in September
Rochester, MN
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is June (11.2 days).
Average UV index in September
Rochester, MN
- Average UV index in September: 4
The month with the highest UV index is 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
Rochester, MN
- Average cloud cover in September: 36
The month with the most cloud cover is January (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Rochester, MN
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
