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
A moderate decline in the average high-temperature is seen during September, decreasing from an agreeable 20.3°C (68.5°F) in August to a refreshing 15.1°C (59.2°F). In the month of September, an average of 5°C (41°F) marks the low-temperature in Slave Lake.Humidity
In September, the average relative humidity is 71%.Rainfall
In Slave Lake, in September, during 11.1 rainfall days, 22mm (0.87") of precipitation is typically accumulated. Throughout the year, in Slave Lake, there are 119.7 rainfall days, and 409mm (16.1") of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows in Slave Lake. Throughout September, in the average 1.1 snowfall days, it receives 4mm (0.16") of snow. In Slave Lake, during the entire year, snow falls for 114.3 days and aggregates up to 1073mm (42.24") of snow.Daylight
The average length of the day in September in Slave Lake is 12h and 42min.On the first day of the month, sunrise is at 6:46 am and sunset at 8:31 pm. On the last day of September, in Slave Lake, sunrise is at 7:41 am and sunset at 7:16 pm MDT.
Sunshine
The average sunshine in September in Slave Lake is 8.3h.UV index
In Slave Lake, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: The maximum UV index of 3 during September translates into these guidelines:
Make use of precautions - Suggestions to resist sunburn are communicated. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Frequently asked questions
What is the usual temperature for Slave Lake in September?
What is the average humidity in September in Slave Lake?
How many days does it rain in September in Slave Lake?
When does it start to snow in Slave Lake?
What is the average length of the day in September in Slave Lake?
When is the sunrise / sunset in September in Slave Lake?
How many hours of sunshine does Slave Lake have in September?
What is the UV index intensity in September in Slave Lake?
Average temperature in September
Slave Lake, Canada
- Average high temperature in September: 15.1°C
The warmest month (with the highest average high temperature) is July (21°C).
The month with the lowest average high temperature is December (-8.5°C).
- Average low temperature in September: 5°C
The month with the highest average low temperature is July (9.9°C).
The coldest month (with the lowest average low temperature) is February (-15.1°C).
Average pressure in September
Slave Lake, Canada
- Average pressure in September: 1013mbar
The month with the highest atmospheric pressure is February (1019.9mbar).
The month with the lowest atmospheric pressure is June (1010.1mbar).
Average wind speed in September
Slave Lake, Canada
- Average wind speed in September: 11.5km/h
The windiest month (with the highest average wind speed) is October (12.2km/h).
The calmest month (with the lowest average wind speed) is July (10.5km/h).
Average humidity in September
Slave Lake, Canada
- Average humidity in September: 71%
The month with the highest relative humidity is February (93%).
The month with the lowest relative humidity is May (61%).
Average rainfall in September
Slave Lake, Canada
- Average rainfall in September: 22mm
The wettest month (with the highest rainfall) is June (71mm).
The driest month (with the least rainfall) is December (18mm).
Average rainfall days in September
Slave Lake, Canada
- Average rainfall days in September: 11.1 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in September
Slave Lake, Canada
- Average snowfall in September: 4mm
The month with the highest snowfall is March (173mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Slave Lake, Canada
- Average snowfall days in September: 1.1 days
The month with the highest number of snowfall days is March (19.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Slave Lake, Canada
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 17h and 18min).
The month with the shortest days is December (Average daylight: 7h and 12min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 12min).
Average sunshine days in September
Slave Lake, Canada
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is September (16.5 days).
The month with the least sunshine days is April (8 days).
Average UV index in September
Slave Lake, Canada
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, October and December (UV index 1).
Average cloud cover in September
Slave Lake, Canada
- Average cloud cover in September: 37
The months with the most cloud cover are February and March (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Slave Lake, Canada
- Average visibility in September: 9km
The months with the highest visibility are May, June, July, August, September and October (9km).
The months with the lowest visibility are January, February and March (6km).
Slave Lake, Canada
Weather forecast for your location
2. Allow the app to use your location
