Contents
- Weather in September
- Frequently asked questions
- Average temperature 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 UV index in September
September
Weather in September
Temperature
September in St. John's heralds a minor drop in average high-temperature, sliding from August's pleasant 20.5°C (68.9°F) to an enjoyable 16.5°C (61.7°F). In September, in St. John's, the average low-temperature is a frosty 8.2°C (46.8°F).Rainfall
In St. John's, during September, the rain falls for 15.5 days and regularly aggregates up to 130mm (5.12") of precipitation. In St. John's, during the entire year, the rain falls for 162.7 days and collects up to 1207mm (47.52") of precipitation.Snowfall
In St. John's, snow does not fall in July through September.Sea temperature
In St. John's, in September, the average water temperature is 11.9°C (53.4°F).Note: Being in 11.9°C (53.4°F) waters at 13°C (55.4°F) is discomforting, but anything below 10°C (50°F) can jeopardize breathing and induce cold shock, factoring in physical endurance.
Daylight
In St. John's, the average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:40 pm. On the last day of September, in St. John's, sunrise is at 6:59 am and sunset at 6:41 pm NDT.
Sunshine
In St. John's, Canada, the average sunshine in September is 5.7h.UV index
In September, the average daily maximum UV index in St. John's is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: In September, a daily UV index of 5 turns into the following recommendations:
Take necessary precautions - Defending against sun damage is advocated. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for St. John's in September?
How many days does it rain in September in St. John's?
When it does not snow in St. John's?
Does it snow in St. John's in September?
What is the water temperature in September in St. John's?
What is the average length of the day in September in St. John's?
What time are sunrise and sunset in September in St. John's?
How long on average sun shines in September in St. John's?
What is the UV index reading in September in St. John's?
Average temperature in September
St. John's, Canada
- Average high temperature in September: 16.5°C
The warmest month (with the highest average high temperature) is July (20.7°C).
The month with the lowest average high temperature is February (-1.1°C).
- Average low temperature in September: 8.2°C
The month with the highest average low temperature is August (11.6°C).
The coldest month (with the lowest average low temperature) is February (-8.6°C).
Average rainfall in September
St. John's, Canada
- Average rainfall in September: 129.6mm
The wettest month (with the highest rainfall) is October (153.7mm).
The driest month (with the least rainfall) is February (61.6mm).
Average rainfall days in September
St. John's, Canada
- Average rainfall days in September: 15.5 days
The month with the highest number of rainy days is October (18.1 days).
The month with the least rainy days is February (8.6 days).
Average snowfall in September
St. John's, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is January (887mm).
The months with the least snowfall are July, August and September (0mm).
Average snowfall days in September
St. John's, 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 July, August and September (0 days).
Average sea temperature in September
St. John's, Canada
- Average sea temperature in September: 11.9°C
The best month for swimming (with the highest average sea temperature) is August (13.9°C).
The coldest month (with the lowest average sea temperature) is March (-0.4°C).
Average daylight in September /
Average sunshine in September
St. John's, Canada
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 5h and 4min
The month with the most sunshine is July (Average sunshine: 7h and 0min).
The month with the least sunshine is December (Average sunshine: 2h and 0min).
Average UV index in September
St. John's, Canada
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, November and December (UV index 1).
