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 sea temperature 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
In the transition to September, Saint Catharines observes a minor drop in the average high-temperature, shifting from a moderately hot 24.6°C (76.3°F) in August to a pleasant 21.5°C (70.7°F). Throughout September, Saint Catharines anticipates an average low-temperature of 15.5°C (59.9°F).Humidity
With an average relative humidity of 74%, September is the least humid month in Saint Catharines, Canada.Rainfall
September and November are months with the least rain in Saint Catharines when the rain falls for 15.1 days and typically aggregates up to 55mm (2.17") of rain.Snowfall
In Saint Catharines, Canada, snow does not fall in June through September.Sea temperature
In Saint Catharines, in September, the average water temperature is 20.8°C (69.4°F).Note: Most individuals do not find swimming at 20.8°C (69.4°F) to be enjoyable. As the water temperature declines below 21°C (69.8°F), maintaining control over one's breathing becomes harder.
Daylight
In Saint Catharines, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:42 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 6:59 pm EDT.
Sunshine
The average sunshine in September in Saint Catharines, Canada, is 9.4h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Undertake protective steps - Preventing sun damage is advised. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Frequently asked questions
What are the temperatures in Saint Catharines in September?
What is the least humid month in Saint Catharines?
What is the average humidity in September in Saint Catharines?
What is the driest month in Saint Catharines?
How much does it rain in Saint Catharines in September?
When it does not snow in Saint Catharines?
Does it snow in Saint Catharines in September?
What is the sea temperature in September in Saint Catharines?
What is the average length of the day in September in Saint Catharines?
What time are sunrise and sunset in September in Saint Catharines?
How long on average sun shines in September in Saint Catharines?
What is the UV index reading in September in Saint Catharines?
Average temperature in September
Saint Catharines, Canada
- Average high temperature in September: 21.5°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 (-1.4°C).
- Average low temperature in September: 15.5°C
The month with the highest average low temperature is July (18.6°C).
The coldest month (with the lowest average low temperature) is January (-6.1°C).
Average pressure in September
Saint Catharines, Canada
- Average pressure in September: 1017.2mbar
The month with the highest atmospheric pressure is November (1018.5mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).
Average wind speed in September
Saint Catharines, Canada
- Average wind speed in September: 14.1km/h
The windiest month (with the highest average wind speed) is January (21km/h).
The calmest month (with the lowest average wind speed) is July (12.1km/h).
Average humidity in September
Saint Catharines, Canada
- Average humidity in September: 74%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is September (74%).
Average rainfall in September
Saint Catharines, Canada
- Average rainfall in September: 55mm
The wettest month (with the highest rainfall) is July (80mm).
The driest months (with the least rainfall) are September and November (55mm).
Average rainfall days in September
Saint Catharines, Canada
- Average rainfall days in September: 15.1 days
The month with the highest number of rainy days is October (18.9 days).
The month with the least rainy days is February (8.8 days).
Average snowfall in September
Saint Catharines, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is February (127mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Saint Catharines, Canada
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (14.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Saint Catharines, Canada
- Average sea temperature in September: 20.8°C
The best month for swimming (with the highest average sea temperature) is August (23.2°C).
The coldest month (with the lowest average sea temperature) is February (1.7°C).
Average daylight in September /
Average sunshine in September
Saint Catharines, Canada
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in September
Saint Catharines, Canada
- Average sunshine days in September: 13 days
The month with the most sunshine days is September (13 days).
The month with the least sunshine days is January (7.5 days).
Average UV index in September
Saint Catharines, Canada
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Saint Catharines, Canada
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Saint Catharines, Canada
- Average visibility in September: 10km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January and February (8km).
Saint Catharines, Canada
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