September weather forecastOshkosh, WI
September
Weather in September
September brings the onset of autumn in Oshkosh. The weather starts becoming cooler with a significant reduction in humidity. The noticeable change in temperatures, dropping to a low of 52.3°F (11.3°C), signals the transition from summer to fall. The length of the day continues to shorten and the number of daylight hours decreases noticeably. The change in climate is conducive to the beautiful autumn foliage that Oshkosh is known for.Temperature
September implies a soft temperature shift, with average high-temperatures reducing from August's moderately hot 75.9°F (24.4°C) to an agreeable 69.4°F (20.8°C). During the month of September, Oshkosh experiences a steady low-temperature average of 52.3°F (11.3°C).Humidity
In September, the average relative humidity in Oshkosh is 80%.Rainfall
In September, the rain falls for 12 days. Throughout September, 2.13" (54mm) of precipitation is accumulated. Throughout the year, there are 126.8 rainfall days, and 25.2" (640mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In September, the average length of the day in Oshkosh is 12h and 30min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:51 am and sunset at 6:36 pm CDT.
Sunshine
The average sunshine in September in Oshkosh is 8.4h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The daily high UV index of 3 during September translates into the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Oshkosh, WI
- Average high temperature in September: 69.4°F
The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is January (22.5°F).
- Average low temperature in September: 52.3°F
The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).
Average pressure in September
Oshkosh, WI
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are January, February and March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Oshkosh, WI
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (7.5mph).
Average humidity in September
Oshkosh, WI
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is April (76%).
Average rainfall in September
Oshkosh, WI
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is May (3.62").
The driest month (with the least rainfall) is February (1.02").
Average rainfall days in September
Oshkosh, WI
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (3.6 days).
Average snowfall in September
Oshkosh, WI
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.76").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Oshkosh, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Oshkosh, WI
- 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 24min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The months with the least sunshine are January and February (Average sunshine: 3h and 24min).
Average sunshine days in September
Oshkosh, WI
- Average sunshine days in September: 17.2 days
The month with the most sunshine days is September (17.2 days).
The month with the least sunshine days is April (11.9 days).
Average UV index in September
Oshkosh, WI
- 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, February, November and December (UV index 1).
Average cloud cover in September
Oshkosh, WI
- Average cloud cover in September: 36
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in September
Oshkosh, WI
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, July, August, October, November and December (6mi).
The months with the lowest visibility are January, February and September (5mi).
