September weather forecastHales Corners, WI
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Hales Corners, Wisconsin, with an average temperature fluctuating between 56.5°F (13.6°C) and 70.9°F (21.6°C).Temperature
September marks a gentle change in average high-temperature, declining from August's moderately hot 77.4°F (25.2°C) to a pleasant 70.9°F (21.6°C). Nighttime temperature dips to a mean of 56.5°F (13.6°C) during September.Humidity
The average relative humidity in September is 77%.Rainfall
In Hales Corners, during September, the rain falls for 12.1 days and regularly aggregates up to 1.57" (40mm) of precipitation. Throughout the year, there are 129 rainfall days, and 20.35" (517mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In Hales Corners, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:49 am and sunset at 6:34 pm CDT.
Sunshine
The average sunshine in September is 9.1h.UV index
In Hales Corners, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Be vigilant - Suggestions to stave off sun damage are provided. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hales Corners, WI
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in September: 56.5°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (16°F).
Average pressure in September
Hales Corners, WI
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Hales Corners, WI
- Average wind speed in September: 8.2mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
Hales Corners, WI
- Average humidity in September: 77%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Hales Corners, WI
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is July (2.6").
The driest month (with the least rainfall) is December (0.79").
Average rainfall days in September
Hales Corners, WI
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is February (3.2 days).
Average snowfall in September
Hales Corners, WI
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.23").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Hales Corners, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Hales Corners, WI
- 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: 9h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Hales Corners, WI
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is July (11.4 days).
Average UV index in September
Hales Corners, WI
- 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 and December (UV index 1).
Average cloud cover in September
Hales Corners, WI
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 29).
Average visibility in September
Hales Corners, WI
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
