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
September
Weather in September
Temperature
A mild shift in the average high-temperature occurs in September, reducing from a moderately hot 23.8°C (74.8°F) in August to an agreeable 20.3°C (68.5°F). Nighttime temperature dips to a mean of 13.5°C (56.3°F) during September.Humidity
The average relative humidity in September in Ajax, Canada, is 77%.Rainfall
In Ajax, during September, the rain falls for 13.4 days and regularly aggregates up to 47mm (1.85") of precipitation. Throughout the year, in Ajax, there are 151.8 rainfall days, and 663mm (26.1") of precipitation is accumulated.Snowfall
May through October are months without snowfall in Ajax.Daylight
The average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:40 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:13 am and sunset at 6:58 pm EDT.
Sunshine
The average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September in Ajax is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Ensure safety - Imperative it is to shield skin and eyes from damage. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Ajax in September?
What is the average humidity in September in Ajax?
How much does it rain in Ajax in September?
When it does not snow in Ajax?
How many hours of daylight does Ajax have in September?
When are sunrise and sunset in September in Ajax?
How many hours of sunshine does Ajax have in September?
What is the UV index intensity in September in Ajax?
Average temperature in September
Ajax, Canada
- Average high temperature in September: 20.3°C
The warmest month (with the highest average high temperature) is July (24.3°C).
The month with the lowest average high temperature is January (-2.8°C).
- Average low temperature in September: 13.5°C
The months with the highest average low temperature are July and August (16.8°C).
The coldest month (with the lowest average low temperature) is January (-8.3°C).
Average pressure in September
Ajax, Canada
- Average pressure in September: 1017mbar
The month with the highest atmospheric pressure is March (1018.3mbar).
The month with the lowest atmospheric pressure is June (1013mbar).
Average wind speed in September
Ajax, Canada
- Average wind speed in September: 13km/h
The windiest month (with the highest average wind speed) is January (18.7km/h).
The calmest month (with the lowest average wind speed) is July (11.4km/h).
Average humidity in September
Ajax, Canada
- Average humidity in September: 77%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (76%).
Average rainfall in September
Ajax, Canada
- Average rainfall in September: 47mm
The wettest month (with the highest rainfall) is August (74mm).
The driest month (with the least rainfall) is November (38mm).
Average rainfall days in September
Ajax, Canada
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (6.3 days).
Average snowfall in September
Ajax, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is February (106mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Ajax, Canada
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Ajax, Canada
- 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 2min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in September
Ajax, Canada
- Average sunshine days in September: 14.9 days
The month with the most sunshine days is November (15.1 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in September
Ajax, Canada
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Ajax, Canada
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Ajax, Canada
- Average visibility in September: 10km
The months with the highest visibility are August and September (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, October, November and December (9km).
