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's onset corresponds with a shift in the average high-temperature, moving from a tropical 91.9°F (33.3°C) in August to a moderately hot 80.6°F (27°C). September nights report a substantial dip from daytime highs to an average of 55.2°F (12.9°C).Humidity
The average relative humidity in September is 36%.Rainfall
In September, the rain falls for 3.1 days. Throughout September, 0.2" (5mm) of precipitation is accumulated. Throughout the year, there are 84.9 rainfall days, and 9.29" (236mm) of precipitation is accumulated.Snowfall
In Ontario, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 29min.On the first day of September, sunrise is at 7:12 am and sunset at 8:23 pm. On the last day of the month, sunrise is at 7:45 am and sunset at 7:29 pm MDT.
Sunshine
In Ontario, the average sunshine in September is 9.5h.UV index
In September, the average daily maximum UV index in Ontario is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Take precautions - Protection against sun damage is advised. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Frequently asked questions
What is the average September temperature in Ontario?
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?
What is the UV index intensity in September in Ontario?
Average temperature in September
Ontario, OR
- Average high temperature in September: 80.6°F
The warmest month (with the highest average high temperature) is July (93.2°F).
The months with the lowest average high temperature are January and December (36.1°F).
- Average low temperature in September: 55.2°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is December (23°F).
Average pressure in September
Ontario, OR
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The months with the lowest atmospheric pressure are June and August (29.92"Hg).
Average wind speed in September
Ontario, OR
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest month (with the lowest average wind speed) is January (3.9mph).
Average humidity in September
Ontario, OR
- Average humidity in September: 36%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (29%).
Average rainfall in September
Ontario, OR
- Average rainfall in September: 0.2"
The wettest month (with the highest rainfall) is December (1.57").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in September
Ontario, OR
- Average rainfall days in September: 3.1 days
The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is August (1.8 days).
Average snowfall in September
Ontario, OR
- Average snowfall in September: 0"
The month with the highest snowfall is December (5.35").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Ontario, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (7.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Ontario, OR
- 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: 9h and 3min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in September
Ontario, OR
- Average sunshine days in September: 26.1 days
The month with the most sunshine days is July (27.7 days).
The month with the least sunshine days is February (15.2 days).
Average UV index in September
Ontario, OR
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Ontario, OR
- Average cloud cover in September: 14
The months with the most cloud cover are January and December (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 8).
Average visibility in September
Ontario, OR
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
Ontario, Oregon, USA
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