September weather forecastMarkham, Canada
September
Weather in September
September symbolizes the end of summer and the initial hints of the fall season. The weather is beginning to cool down and the daylight hours start to decrease. A significant fall in the maximum temperature to 20.6°C (69.1°F) and a decrease in average rainfall to 49mm (1.93") strongly suggest this transition. But temperatures are still warm enough to enjoy outdoor activities. Conclusively, September exhibits a distinctive blend of summer warmth with a bit of fall freshness in Markham.Temperature
As September arrives, Markham's weather displays a minor decrease in high-temperatures, transitioning from August's moderately hot 24.3°C (75.7°F) to an agreeable 20.6°C (69.1°F). In September, Markham experiences a temperature dip to an average of 12.9°C (55.2°F) at night.Humidity
In September, the average relative humidity in Markham is 77%.Rainfall
In September, in Markham, the rain falls for 15 days. Throughout September, 49mm (1.93") of precipitation is accumulated. In Markham, during the entire year, the rain falls for 157.1 days and collects up to 653mm (25.71") of precipitation.Snowfall
In Markham, snow does not fall in June through September.Daylight
In Markham, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:41 am and sunset at 7:52 pm. On the last day of September, in Markham, sunrise is at 7:14 am and sunset at 6:59 pm EDT.
Sunshine
In September, the average sunshine in Markham is 9.3h.UV index
In Markham, 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 exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 4 during September leads to these advisories:
Take necessary precautions - Defending against sun damage is advocated. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Markham, Canada
- Average high temperature in September: 20.6°C
The warmest month (with the highest average high temperature) is July (24.8°C).
The month with the lowest average high temperature is January (-3.2°C).
- Average low temperature in September: 12.9°C
The months with the highest average low temperature are July and August (16.6°C).
The coldest month (with the lowest average low temperature) is January (-8.8°C).
Average pressure in September
Markham, 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
Markham, Canada
- Average wind speed in September: 12.3km/h
The windiest month (with the highest average wind speed) is January (17.5km/h).
The calmest month (with the lowest average wind speed) is July (10.8km/h).
Average humidity in September
Markham, 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 (75%).
Average rainfall in September
Markham, Canada
- Average rainfall in September: 49mm
The wettest month (with the highest rainfall) is July (78mm).
The driest month (with the least rainfall) is February (30mm).
Average rainfall days in September
Markham, Canada
- Average rainfall days in September: 15 days
The month with the highest number of rainy days is August (18.3 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in September
Markham, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is January (118mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Markham, Canada
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Markham, Canada
- Average daylight in September: 12h and 30min
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 18min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in September
Markham, Canada
- Average sunshine days in September: 12.8 days
The month with the most sunshine days is March (14.9 days).
The month with the least sunshine days is August (9 days).
Average UV index in September
Markham, 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
Markham, Canada
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 69).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in September
Markham, Canada
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
