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 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
The shift from August to September is characterized by an average high-temperature of a still agreeable 22.8°C (73°F), not significantly different from the 20.8°C (69.4°F) of August. Despite soaring daytime temperatures, Port Saint Johns registers a consistent average low-temperature of 10.2°C (50.4°F) in September.Humidity
The average relative humidity in September in Port Saint Johns, South Africa, is 63%.Rainfall
In Port Saint Johns, in September, during 11.9 rainfall days, 23mm (0.91") of precipitation is typically accumulated. In Port Saint Johns, during the entire year, the rain falls for 172 days and collects up to 557mm (21.93") of precipitation.Sea temperature
In Port Saint Johns, in September, the average water temperature is 21.9°C (71.4°F).Note: The majority of people do not enjoy swimming in 21.9°C (71.4°F). The difficulty in controlling breathing escalates as the temperature descends from 21°C (69.8°F) to 15°C (59°F).
Daylight
In September, the average length of the day is 11h and 55min.On the first day of the month, sunrise is at 06:17 and sunset at 17:45. On the last day of September, sunrise is at 05:40 and sunset at 18:03 SAST.
Sunshine
In September, the average sunshine in Port Saint Johns, South Africa, is 7.7h.UV index
The months with the lowest UV index in Port Saint Johns are May through July, September and October, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: A typical high UV index of 4 in September suggests the following recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be mindful! Sand and water reflections can up the Sun's UV exposure.
Frequently asked questions
What is the temperature in September in Port Saint Johns?
What is the average humidity in September in Port Saint Johns?
How many days does it rain in September in Port Saint Johns?
What is the sea temperature in September in Port Saint Johns?
How many hours of daylight does Port Saint Johns have in September?
What time are sunrise and sunset in September in Port Saint Johns?
How many hours of sunshine does Port Saint Johns have in September?
When is the lowest UV index in Port Saint Johns?
What is the UV index intensity in September in Port Saint Johns?
Average temperature in September
Port Saint Johns, South Africa
- Average high temperature in September: 22.8°C
The warmest months (with the highest average high temperature) are January and February (25.8°C).
The month with the lowest average high temperature is July (19.1°C).
- Average low temperature in September: 10.2°C
The month with the highest average low temperature is February (15.3°C).
The coldest month (with the lowest average low temperature) is July (7.2°C).
Average pressure in September
Port Saint Johns, South Africa
- Average pressure in September: 1018.9mbar
The month with the highest atmospheric pressure is July (1023.5mbar).
The month with the lowest atmospheric pressure is January (1014.1mbar).
Average wind speed in September
Port Saint Johns, South Africa
- Average wind speed in September: 8km/h
The windiest month (with the highest average wind speed) is August (8.4km/h).
The calmest month (with the lowest average wind speed) is March (6.5km/h).
Average humidity in September
Port Saint Johns, South Africa
- Average humidity in September: 63%
The month with the highest relative humidity is February (83%).
The months with the lowest relative humidity are June, July and August (55%).
Average rainfall in September
Port Saint Johns, South Africa
- Average rainfall in September: 23mm
The wettest month (with the highest rainfall) is January (93mm).
The driest month (with the least rainfall) is June (11mm).
Average rainfall days in September
Port Saint Johns, South Africa
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is December (23.5 days).
The month with the least rainy days is June (5 days).
Average sea temperature in September
Port Saint Johns, South Africa
- Average sea temperature in September: 21.9°C
The best month for swimming (with the highest average sea temperature) is March (26.4°C).
The coldest month (with the lowest average sea temperature) is August (21°C).
Average daylight in September /
Average sunshine in September
Port Saint Johns, South Africa
- Average daylight in September: 11h and 5min
The month with the longest days is December (Average daylight: 14h and 12min).
The month with the shortest days is June (Average daylight: 10h and 6min).
- Average sunshine in September: 7h and 4min
The month with the most sunshine is October (Average sunshine: 8h and 36min).
The month with the least sunshine is April (Average sunshine: 6h and 12min).
Average sunshine days in September
Port Saint Johns, South Africa
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is July (24.5 days).
The month with the least sunshine days is January (4.4 days).
Average UV index in September
Port Saint Johns, South Africa
- Average UV index in September: 4
The months with the highest UV index are January, February, March, April, August, November and December (UV index 5).
The months with the lowest UV index are May, June, July, September and October (UV index 4).
Average cloud cover in September
Port Saint Johns, South Africa
- Average cloud cover in September: 34
The month with the most cloud cover is December (Cloud cover 60).
The month with the least cloud cover is June (Cloud cover 17).
Average visibility in September
Port Saint Johns, South Africa
- Average visibility in September: 9km
The month with the highest visibility is June (10km).
The month with the lowest visibility is January (6km).
Port Saint Johns, South Africa
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