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
As September arrives, Longueuil's weather displays a minor decrease in high-temperatures, transitioning from August's moderately hot 24.8°C (76.6°F) to a pleasant 20.8°C (69.4°F). An average low-temperature of 11.5°C (52.7°F) is recorded in the month of September in Longueuil.Humidity
In September, the average relative humidity in Longueuil, Canada, is 76%.Rainfall
September is the month with the least rainfall. Rain falls for 12 days and accumulates 55mm (2.17") of precipitation.Snowfall
In Longueuil, snow does not fall in June through September.Daylight
In Longueuil, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:16 am and sunset at 7:31 pm. On the last day of September, in Longueuil, sunrise is at 6:51 am and sunset at 6:35 pm EDT.
Sunshine
In Longueuil, Canada, the average sunshine in September is 8.5h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 3 during September leads to these instructions:
Undertake precautions - Obligation exists to protect against skin and eye damage. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Longueuil?
What is the average humidity in September in Longueuil?
What is the driest month in Longueuil?
How many days does it rain in September in Longueuil?
When it does not snow in Longueuil?
Does it snow in Longueuil in September?
How many hours of daylight does Longueuil have in September?
When are sunrise and sunset in September in Longueuil?
How long on average sun shines in September in Longueuil?
What is the UV index intensity in September in Longueuil?
Average temperature in September
Longueuil, Canada
- Average high temperature in September: 20.8°C
The warmest month (with the highest average high temperature) is July (25.8°C).
The month with the lowest average high temperature is January (-5.8°C).
- Average low temperature in September: 11.5°C
The month with the highest average low temperature is July (16.3°C).
The coldest month (with the lowest average low temperature) is January (-13.1°C).
Average pressure in September
Longueuil, Canada
- Average pressure in September: 1017.1mbar
The month with the highest atmospheric pressure is November (1017.8mbar).
The month with the lowest atmospheric pressure is June (1012.4mbar).
Average wind speed in September
Longueuil, Canada
- Average wind speed in September: 11.1km/h
The windiest month (with the highest average wind speed) is April (14.3km/h).
The calmest month (with the lowest average wind speed) is August (10.9km/h).
Average humidity in September
Longueuil, Canada
- Average humidity in September: 76%
The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is May (73%).
Average rainfall in September
Longueuil, Canada
- Average rainfall in September: 55mm
The wettest month (with the highest rainfall) is May (85mm).
The driest month (with the least rainfall) is September (55mm).
Average rainfall days in September
Longueuil, Canada
- Average rainfall days in September: 12 days
The months with the highest number of rainy days are May and July (17.8 days).
The month with the least rainy days is January (5 days).
Average snowfall in September
Longueuil, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is January (293mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Longueuil, Canada
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (18.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Longueuil, Canada
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 2h and 42min).
Average sunshine days in September
Longueuil, Canada
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is September (16.2 days).
The month with the least sunshine days is February (8.9 days).
Average UV index in September
Longueuil, Canada
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in September
Longueuil, Canada
- Average cloud cover in September: 38
The month with the most cloud cover is February (Cloud cover 71).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in September
Longueuil, Canada
- Average visibility in September: 9km
The months with the highest visibility are April, May, June, July, August, September, October and November (9km).
The months with the lowest visibility are January and February (7km).
