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
Stony Mountain observes a minor decrease in the average high-temperature with the arrival of September, falling from August's moderately hot 78.1°F to an enjoyable 67.1°F. Throughout September, Stony Mountain witnesses a consistent average low-temperature of 50°F.Humidity
In September, the average relative humidity is 64%.Rainfall
In September, the rain falls for 10.2 days. Throughout September, 1.69" of precipitation is accumulated. Throughout the year, there are 101.8 rainfall days, and 15.55" of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September in Stony Mountain is 12h and 35min.On the first day of the month, sunrise is at 6:45 am and sunset at 8:12 pm. On the last day of September, sunrise is at 7:28 am and sunset at 7:08 pm CDT.
Sunshine
In Stony Mountain, the average sunshine in September is 8.4h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 suggests this advice:
Take necessary precautions - Suggestions to elude sunburn are provided. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Stony Mountain have in September?
What is the UV index reading in September?
Average temperature in September
Stony Mountain, Canada
- Average high temperature in September: 67.1°F
The warmest month (with the highest average high temperature) is August (78.1°F).
The month with the lowest average high temperature is January (11.7°F).
- Average low temperature in September: 50°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (-1.3°F).
Average pressure in September
Stony Mountain, Canada
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is February (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Stony Mountain, Canada
- Average wind speed in September: 9.2mph
The windiest month (with the highest average wind speed) is October (9.9mph).
The calmest month (with the lowest average wind speed) is August (8mph).
Average humidity in September
Stony Mountain, Canada
- Average humidity in September: 64%
The months with the highest relative humidity are January and February (92%).
The months with the lowest relative humidity are May and August (63%).
Average rainfall in September
Stony Mountain, Canada
- Average rainfall in September: 1.69"
The wettest month (with the highest rainfall) is June (2.76").
The driest month (with the least rainfall) is February (0.39").
Average rainfall days in September
Stony Mountain, Canada
- Average rainfall days in September: 10.2 days
The month with the highest number of rainy days is June (18 days).
The month with the least rainy days is February (1.2 days).
Average snowfall in September
Stony Mountain, Canada
- Average snowfall in September: 0"
The month with the highest snowfall is November (3.58").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Stony Mountain, Canada
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (13.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Stony Mountain, Canada
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 18min).
The month with the shortest days is December (Average daylight: 8h and 12min).
- Average sunshine in September: 8h 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 30min).
Average sunshine days in September
Stony Mountain, Canada
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is December (18.9 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in September
Stony Mountain, Canada
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 1).
Average cloud cover in September
Stony Mountain, Canada
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 74).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Stony Mountain, Canada
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
