September weather forecastOshawa, Canada
September
Weather in September
In September, Oshawa sees the advent of fall, as temperatures begin to drop and days become shorter. However, the high temperature averaging 20.3°C (68.5°F), maintains the warm trend from summer. The pleasant sea temperature persists, allowing beach visits to continue. Rainfall gets scattered across fewer days, and wind speeds pick up, leading to refreshing breezy conditions.Temperature
As September arrives, Oshawa's weather displays a minor decrease in high-temperatures, transitioning from August's warm 23.8°C (74.8°F) to a pleasant 20.3°C (68.5°F). Throughout the month of September, the nighttime temperature dips to an average of 13.4°C (56.1°F).Humidity
In September, the average relative humidity is 77%.Rainfall
In Oshawa, during September, the rain falls for 14.1 days and regularly aggregates up to 52mm (2.05") of precipitation. Throughout the year, there are 158.8 rainfall days, and 693mm (27.28") of precipitation is accumulated.Snowfall
In Oshawa, Canada, snow does not fall in May through October.Sea temperature
In Oshawa, in September, the average water temperature is 20.1°C (68.2°F).Note: Most people do not find pleasure in swimming when the water temperature is 20.1°C (68.2°F). Breathing becomes increasingly difficult to manage as the water temperature drops from 21°C (69.8°F) to 15°C (59°F).
Daylight
In September, the average length of the day in Oshawa is 12h and 30min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:12 am and sunset at 6:57 pm EDT.
Sunshine
The average sunshine in September in Oshawa is 9.3h.UV index
In September, the average daily maximum UV index in Oshawa is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Oshawa, Canada
- Average high temperature in September: 20.3°C
The warmest month (with the highest average high temperature) is July (24.4°C).
The month with the lowest average high temperature is January (-2.9°C).
- Average low temperature in September: 13.4°C
The month with the highest average low temperature is August (16.8°C).
The coldest month (with the lowest average low temperature) is January (-8.3°C).
Average pressure in September
Oshawa, Canada
- Average pressure in September: 1017mbar
The month with the highest atmospheric pressure is March (1018.3mbar).
The month with the lowest atmospheric pressure is June (1013mbar).
Average wind speed in September
Oshawa, Canada
- Average wind speed in September: 13km/h
The windiest month (with the highest average wind speed) is January (18.7km/h).
The calmest month (with the lowest average wind speed) is July (11.4km/h).
Average humidity in September
Oshawa, Canada
- Average humidity in September: 77%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (76%).
Average rainfall in September
Oshawa, Canada
- Average rainfall in September: 52mm
The wettest month (with the highest rainfall) is August (73mm).
The driest months (with the least rainfall) are February and November (43mm).
Average rainfall days in September
Oshawa, Canada
- Average rainfall days in September: 14.1 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in September
Oshawa, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is February (110mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Oshawa, Canada
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (13.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Oshawa, Canada
- Average sea temperature in September: 20.1°C
The best month for swimming (with the highest average sea temperature) is August (22.4°C).
The coldest month (with the lowest average sea temperature) is March (2.3°C).
Average daylight in September /
Average sunshine in September
Oshawa, Canada
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
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 0min).
Average sunshine days in September
Oshawa, Canada
- Average sunshine days in September: 13.6 days
The month with the most sunshine days is November (14.9 days).
The month with the least sunshine days is July (10.4 days).
Average UV index in September
Oshawa, Canada
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Oshawa, Canada
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Oshawa, Canada
- Average visibility in September: 10km
The months with the highest visibility are August and September (10km).
The month with the lowest visibility is January (8km).
