Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With the onset of September, Norwalk experiences a modest temperature adjustment, with the average high-temperature gently receding from a moderately hot 77.5°F (25.3°C) in August to a pleasant 70.7°F (21.5°C). Throughout September in Norwalk, Wisconsin, a steady low-temperature average of 50.9°F (10.5°C) is noted.Humidity
In Norwalk, the average relative humidity in September is 80%.Rainfall
In September, the rain falls for 10.4 days. Throughout September, 1.65" (42mm) of precipitation is accumulated. In Norwalk, during the entire year, the rain falls for 112.6 days and collects up to 18.11" (460mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 29min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:37 pm. On the last day of September, sunrise is at 6:59 am and sunset at 6:44 pm CDT.
Sunshine
In September, the average sunshine is 8.5h.UV index
The average daily maximum UV index in September in Norwalk is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The maximum UV index of 3 during September leads to these instructions:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Frequently asked questions
What are the temperatures in Norwalk in September?
What is the average humidity in September in Norwalk?
How many days does it rain in September in Norwalk?
When it does not snow in Norwalk?
Does it snow in Norwalk in September?
What is the average length of the day in September in Norwalk?
When are sunrise and sunset in September in Norwalk?
How many hours of sunshine does Norwalk have in September?
What is the UV index reading in September in Norwalk?
Average temperature in September
Norwalk, WI
- Average high temperature in September: 70.7°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (21.4°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (8.2°F).
Average pressure in September
Norwalk, WI
- Average pressure in September: 30.02"Hg
The months with the highest atmospheric pressure are January and February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Norwalk, WI
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).
Average humidity in September
Norwalk, WI
- Average humidity in September: 80%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is April (77%).
Average rainfall in September
Norwalk, WI
- Average rainfall in September: 1.65"
The wettest month (with the highest rainfall) is June (2.91").
The driest months (with the least rainfall) are January and February (0.67").
Average rainfall days in September
Norwalk, WI
- Average rainfall days in September: 10.4 days
The month with the highest number of rainy days is June (15.3 days).
The month with the least rainy days is February (2.1 days).
Average snowfall in September
Norwalk, WI
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Norwalk, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Norwalk, WI
- Average daylight in September: 12h and 3min
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 3min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in September
Norwalk, WI
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is October (18.1 days).
The month with the least sunshine days is June (11.6 days).
Average UV index in September
Norwalk, WI
- Average UV index in September: 3
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
Norwalk, WI
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in September
Norwalk, WI
- Average visibility in September: 5mi
The months with the highest visibility are April, May, June, October and November (6mi).
The month with the lowest visibility is January (4mi).
Norwalk, Wisconsin, USA
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