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
Ontario records a mild change in average high-temperature during September, easing from a moderately hot 78.3°F (25.7°C) in August to an agreeable 72.7°F (22.6°C). Throughout September, the temperature tends to fall to a consistent average low of 54.7°F (12.6°C).Humidity
In September, the average relative humidity in Ontario, Ohio, is 81%.Rainfall
In Ontario, in September, during 11.8 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. In Ontario, during the entire year, the rain falls for 136.4 days and collects up to 13.15" (334mm) of precipitation.Snowfall
May through October are months without snowfall in Ontario.Daylight
The average length of the day in September in Ontario is 12h and 27min.On the first day of the month, sunrise is at 6:58 am and sunset at 8:02 pm. On the last day of September, sunrise is at 7:26 am and sunset at 7:13 pm EDT.
Sunshine
In Ontario, Ohio, the average sunshine in September is 8h.UV index
In Ontario, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: In September, the maximum UV index of 4 suggests these recommendations:
Put precautions into practice - Guidance to elude sunburn is provided. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Ontario in September?
What is the average humidity in September in Ontario?
How many days does it rain in September in Ontario?
When it does not snow in Ontario?
What is the average length of the day in September in Ontario?
When are sunrise and sunset in September in Ontario?
How long on average sun shines in September in Ontario?
How high is the UV index in September in Ontario?
Average temperature in September
Ontario, OH
- Average high temperature in September: 72.7°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 (30.7°F).
- Average low temperature in September: 54.7°F
The month with the highest average low temperature is July (62.1°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure in September
Ontario, OH
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Ontario, OH
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in September
Ontario, OH
- Average humidity in September: 81%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April, October and November (78%).
Average rainfall in September
Ontario, OH
- Average rainfall in September: 0.87"
The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is February (0.79").
Average rainfall days in September
Ontario, OH
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (6.5 days).
Average snowfall in September
Ontario, OH
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Ontario, OH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.1 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, OH
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 8h and 0min
The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in September
Ontario, OH
- Average sunshine days in September: 16.9 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in September
Ontario, OH
- Average UV index in September: 4
The months with the highest UV index are June and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Ontario, OH
- Average cloud cover in September: 38
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Ontario, OH
- Average visibility in September: 5mi
The months with the highest visibility are February, March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, July, August and September (5mi).
Ontario, Ohio, USA
Weather forecast for your location
2. Allow the app to use your location