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
The arrival of September corresponds with a temperature reduction, down from August's enjoyable 17.6°C (63.7°F) to a cool 10.8°C (51.4°F). Yellowknife's nighttime temperature during September is consistently averaged at a wintry 5.2°C (41.4°F).Humidity
The average relative humidity in September in Yellowknife is 74%.Rainfall
In Yellowknife, during September, the rain falls for 10.2 days and regularly aggregates up to 21mm (0.83") of precipitation. In Yellowknife, Canada, during the entire year, the rain falls for 70.2 days and collects up to 207mm (8.15") of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows in Yellowknife. Throughout September, in the average 2.5 snowfall days, it receives 7mm (0.28") of snow. Throughout the year, there are 112.8 snowfall days, and 564mm (22.2") of snow is accumulated.Daylight
In Yellowknife, the average length of the day in September is 12h and 55min.On the first day of September, sunrise is at 6:28 am and sunset at 8:46 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 7:09 pm MDT.
Sunshine
The average sunshine in September in Yellowknife is 6.8h.UV index
In September, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the UV index of 2 transforms into the following advice:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Frequently asked questions
What are the temperatures in Yellowknife in September?
What is the average humidity in September in Yellowknife?
How many days does it rain in September in Yellowknife?
When does it start to snow in Yellowknife?
What is the average length of the day in September in Yellowknife?
What time are sunrise and sunset in September in Yellowknife?
How long on average sun shines in September in Yellowknife?
What is the UV index reading in September in Yellowknife?
Average temperature in September
Yellowknife, Canada
- Average high temperature in September: 10.8°C
The warmest month (with the highest average high temperature) is July (20.3°C).
The month with the lowest average high temperature is January (-18.8°C).
- Average low temperature in September: 5.2°C
The month with the highest average low temperature is July (12°C).
The coldest month (with the lowest average low temperature) is January (-25.2°C).
Average pressure in September
Yellowknife, Canada
- Average pressure in September: 1010.6mbar
The month with the highest atmospheric pressure is February (1020.3mbar).
The month with the lowest atmospheric pressure is August (1009.9mbar).
Average wind speed in September
Yellowknife, Canada
- Average wind speed in September: 14.9km/h
The windiest month (with the highest average wind speed) is September (14.9km/h).
The calmest month (with the lowest average wind speed) is February (12.2km/h).
Average humidity in September
Yellowknife, Canada
- Average humidity in September: 74%
The month with the highest relative humidity is January (98%).
The month with the lowest relative humidity is June (52%).
Average rainfall in September
Yellowknife, Canada
- Average rainfall in September: 21mm
The wettest month (with the highest rainfall) is August (41mm).
The driest month (with the least rainfall) is February (4mm).
Average rainfall days in September
Yellowknife, Canada
- Average rainfall days in September: 10.2 days
The month with the highest number of rainy days is August (14.5 days).
The month with the least rainy days is February (0.3 days).
Average snowfall in September
Yellowknife, Canada
- Average snowfall in September: 7mm
The month with the highest snowfall is November (114mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in September
Yellowknife, Canada
- Average snowfall days in September: 2.5 days
The month with the highest number of snowfall days is November (20.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Yellowknife, Canada
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 19h and 48min).
The month with the shortest days is December (Average daylight: 5h and 12min).
- Average sunshine in September: 6h and 5min
The month with the most sunshine is June (Average sunshine: 13h and 6min).
The months with the least sunshine are January and December (Average sunshine: 1h and 0min).
Average sunshine days in September
Yellowknife, Canada
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is May (21.2 days).
The month with the least sunshine days is November (11.5 days).
Average UV index in September
Yellowknife, Canada
- Average UV index in September: 2
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 1).
Average cloud cover in September
Yellowknife, Canada
- Average cloud cover in September: 50
The months with the most cloud cover are January and December (Cloud cover 87).
The months with the least cloud cover are June and July (Cloud cover 37).
Average visibility in September
Yellowknife, Canada
- Average visibility in September: 9km
The months with the highest visibility are May, June and July (10km).
The months with the lowest visibility are January and February (5km).
Yellowknife, Canada
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