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
As August transitions into September, Ontario sees a gentle drop in the average high-temperature, transitioning from a moderately hot 78.4°F (25.8°C) to an agreeable 71.1°F (21.7°C). Ontario reports an average nighttime low-temperature of 51.1°F (10.6°C) in September.Humidity
In Ontario, the average relative humidity in September is 80%.Rainfall
In September, in Ontario, the rain falls for 12 days. Throughout September, 2.4" (61mm) of precipitation is accumulated. In Ontario, during the entire year, the rain falls for 131.7 days and collects up to 27.83" (707mm) of precipitation.Snowfall
June through September are months without snowfall in Ontario.Daylight
The average length of the day in September in Ontario 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, in Ontario, sunrise is at 6:59 am and sunset at 6:44 pm CDT.
Sunshine
In September, the average sunshine is 8.8h.UV index
In Ontario, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 3 during September translates into the following directions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Minimize direct exposure to the Sun during midday when its radiation is at its peak. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
What is the usual temperature for Ontario in September?
What is the average humidity in September in Ontario?
How much does it rain in Ontario in September?
When it does not snow in Ontario?
Does it snow in Ontario in September?
What is the average length of the day in September in Ontario?
When are sunrise and sunset in September in Ontario?
How many hours of sunshine does Ontario have in September?
How high is the UV index in September in Ontario?
Average temperature in September
Ontario, WI
- Average high temperature in September: 71.1°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (22.1°F).
- Average low temperature in September: 51.1°F
The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (9.3°F).
Average pressure in September
Ontario, WI
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Ontario, WI
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in September
Ontario, WI
- Average humidity in September: 80%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is April (77%).
Average rainfall in September
Ontario, WI
- Average rainfall in September: 2.4"
The wettest month (with the highest rainfall) is June (4.17").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in September
Ontario, WI
- Average rainfall days in September: 12 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (3.5 days).
Average snowfall in September
Ontario, WI
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.87").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Ontario, WI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Ontario, 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 5min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Ontario, WI
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is December (17.5 days).
The month with the least sunshine days is June (10.4 days).
Average UV index in September
Ontario, 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
Ontario, WI
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Ontario, 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).
Ontario, Wisconsin, USA
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