September weather forecastStephenville, Canada
September
Weather in September
September, the first month of the autumn in Stephenville, is still a mild month, with an average temperature varying between 15.5°C (59.9°F) and 10.3°C (50.5°F).Temperature
September sees a slight reduction in average high-temperature, with a shift from a comfortable 19.9°C (67.8°F) in August to a still refreshing 15.5°C (59.9°F). Stephenville observes an average nighttime low-temperature of 10.3°C (50.5°F) during the month of September.Humidity
In September, the average relative humidity is 81%.Rainfall
In Stephenville, in September, during 14 rainfall days, 52mm (2.05") of precipitation is typically accumulated. Throughout the year, there are 126.7 rainfall days, and 629mm (24.76") of precipitation is accumulated.Snowfall
June through September are months without snowfall in Stephenville.Sea temperature
In Stephenville, the average seawater temperature in September is 13°C (55.4°F).Note: Swimming in 13°C (55.4°F) can be lethal. Merely spending a few minutes in 13°C (55.4°F) waters feels harsh, and venturing below 10°C (50°F) might disrupt breathing control and bring about cold shock, contingent on individual resilience.
Daylight
In Stephenville, the average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 6:42 am and sunset at 8:05 pm. On the last day of September, sunrise is at 7:23 am and sunset at 7:04 pm NDT.
Sunshine
In September, the average sunshine in Stephenville is 7.2h.UV index
In Stephenville, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 3 translates into these guidelines:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Stephenville, Canada
- Average high temperature in September: 15.5°C
The warmest month (with the highest average high temperature) is August (19.9°C).
The month with the lowest average high temperature is February (-3.1°C).
- Average low temperature in September: 10.3°C
The month with the highest average low temperature is August (13.6°C).
The coldest month (with the lowest average low temperature) is February (-8.8°C).
Average pressure in September
Stephenville, Canada
- Average pressure in September: 1014.8mbar
The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is January (1008.6mbar).
Average wind speed in September
Stephenville, Canada
- Average wind speed in September: 18.6km/h
The windiest month (with the highest average wind speed) is January (24.8km/h).
The calmest month (with the lowest average wind speed) is July (14.9km/h).
Average humidity in September
Stephenville, Canada
- Average humidity in September: 81%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is June (80%).
Average rainfall in September
Stephenville, Canada
- Average rainfall in September: 52mm
The wettest month (with the highest rainfall) is November (67mm).
The driest month (with the least rainfall) is March (41mm).
Average rainfall days in September
Stephenville, Canada
- Average rainfall days in September: 14 days
The month with the highest number of rainy days is May (14.5 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in September
Stephenville, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is February (143mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Stephenville, Canada
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (12.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Stephenville, Canada
- Average sea temperature in September: 13°C
The best month for swimming (with the highest average sea temperature) is August (15.5°C).
The coldest month (with the lowest average sea temperature) is March (-0.3°C).
Average daylight in September /
Average sunshine in September
Stephenville, Canada
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 7h and 12min
The month with the most sunshine is August (Average sunshine: 8h and 42min).
The month with the least sunshine is January (Average sunshine: 1h and 36min).
Average sunshine days in September
Stephenville, Canada
- Average sunshine days in September: 14.4 days
The month with the most sunshine days is June (16.1 days).
The month with the least sunshine days is February (9 days).
Average UV index in September
Stephenville, Canada
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Stephenville, Canada
- Average cloud cover in September: 48
The month with the most cloud cover is January (Cloud cover 84).
The month with the least cloud cover is August (Cloud cover 42).
Average visibility in September
Stephenville, Canada
- Average visibility in September: 9km
The months with the highest visibility are March, April, May, June, July, August, September, October and November (9km).
The months with the lowest visibility are January, February and December (8km).
