September weather forecastWaterdown, Canada
September
Weather in September
September, the first month of the autumn in Waterdown, is also an agreeable month, with temperature in the range of an average high of 21.4°C (70.5°F) and an average low of 13.7°C (56.7°F).Temperature
Transition into September subtly marks a drop in the average high-temperature, moderately moving from a moderately hot 24.7°C (76.5°F) in August to an agreeable 21.4°C (70.5°F). Throughout September, the average low-temperature dips to a moderate 13.7°C (56.7°F).Humidity
In Waterdown, the average relative humidity in September is 76%.Rainfall
September is the month with the least rainfall. Rain falls for 14.1 days and accumulates 44mm (1.73") of precipitation.Snowfall
June through October are months without snowfall in Waterdown.Daylight
In September, the average length of the day is 12h and 29min.On the first day of the month, sunrise is at 6:44 am and sunset at 7:54 pm. On the last day of September, sunrise is at 7:16 am and sunset at 7:01 pm EDT.
Sunshine
In Waterdown, the average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index in Waterdown is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: The daily high UV index of 4 during September translates into the following recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Waterdown, Canada
- Average high temperature in September: 21.4°C
The warmest month (with the highest average high temperature) is July (25.4°C).
The month with the lowest average high temperature is January (-2.3°C).
- Average low temperature in September: 13.7°C
The month with the highest average low temperature is July (17.3°C).
The coldest month (with the lowest average low temperature) is January (-7.3°C).
Average pressure in September
Waterdown, Canada
- Average pressure in September: 1017.1mbar
The months with the highest atmospheric pressure are March and November (1018.5mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).
Average wind speed in September
Waterdown, Canada
- Average wind speed in September: 12.7km/h
The windiest month (with the highest average wind speed) is January (19km/h).
The calmest month (with the lowest average wind speed) is July (11.3km/h).
Average humidity in September
Waterdown, Canada
- Average humidity in September: 76%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Waterdown, Canada
- Average rainfall in September: 44mm
The wettest month (with the highest rainfall) is July (74mm).
The driest month (with the least rainfall) is September (44mm).
Average rainfall days in September
Waterdown, Canada
- Average rainfall days in September: 14.1 days
The month with the highest number of rainy days is July (19.2 days).
The month with the least rainy days is February (9.3 days).
Average snowfall in September
Waterdown, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is February (137mm).
The months with the least snowfall are June, July, August, September and October (0mm).
Average snowfall days in September
Waterdown, Canada
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Waterdown, Canada
- Average daylight in September: 12h and 30min
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 0min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in September
Waterdown, Canada
- Average sunshine days in September: 13.8 days
The month with the most sunshine days is September (13.8 days).
The month with the least sunshine days is February (9 days).
Average UV index in September
Waterdown, Canada
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Waterdown, Canada
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Waterdown, Canada
- Average visibility in September: 9km
The month with the highest visibility is August (10km).
The month with the lowest visibility is January (8km).
