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
September indicates a minor shift in the average high-temperature, from August's moderately hot 75.9°F (24.4°C) to a pleasant 70.3°F (21.3°C). Ontario encounters an average low-temperature of 58.3°F (14.6°C) during September nights.Humidity
August and September, with an average relative humidity of 75%, are the least humid months.Rainfall
The month with the least rainfall is September, when the rain falls for 14.2 days and typically collects 2.01" (51mm) of precipitation.Snowfall
June through September are months without snowfall in Ontario, New York.Daylight
In Ontario, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:34 am and sunset at 7:43 pm. On the last day of September, in Ontario, sunrise is at 7:06 am and sunset at 6:51 pm EDT.
Sunshine
In Ontario, the average sunshine in September is 9.3h.UV index
In Ontario, New York, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the maximum UV index of 4 translates into these guidelines:
Take necessary precautions - Protection from skin and eye injury is mandatory. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Ontario?
What are the least humid months in Ontario?
What is the average humidity in September in Ontario?
What is the driest month in Ontario?
How many days does it rain in September in Ontario?
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?
What time are sunrise and sunset in September in Ontario?
How long on average sun shines in September in Ontario?
What is the UV index reading in September in Ontario?
Average temperature in September
Ontario, NY
- Average high temperature in September: 70.3°F
The warmest month (with the highest average high temperature) is July (76.5°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in September: 58.3°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure in September
Ontario, NY
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Ontario, NY
- Average wind speed in September: 8.8mph
The windiest month (with the highest average wind speed) is January (13.2mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).
Average humidity in September
Ontario, NY
- Average humidity in September: 75%
The months with the highest relative humidity are January and February (83%).
The months with the lowest relative humidity are August and September (75%).
Average rainfall in September
Ontario, NY
- Average rainfall in September: 2.01"
The wettest month (with the highest rainfall) is October (3.23").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in September
Ontario, NY
- Average rainfall days in September: 14.2 days
The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in September
Ontario, NY
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.98").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Ontario, NY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.4 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, NY
- Average daylight in September: 12h and 3min
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 0min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 36min).
Average sunshine days in September
Ontario, NY
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is February (7.3 days).
Average UV index in September
Ontario, NY
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Ontario, NY
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in September
Ontario, NY
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Ontario, New York, USA
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