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 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
September introduces a marginal temperature uplift, with average high-temperatures adjusting from August's pleasant 21.3°C (70.3°F) to a moderately hot 25.7°C (78.3°F). Against the high September temperatures, Grasmere records an average drop to a cool 11.5°C (52.7°F) at night.Humidity
The least humid month in Grasmere is September, with an average relative humidity of 33%.Rainfall
In Grasmere, in September, it is raining for 2.5 days, with typically 5mm (0.2") of accumulated precipitation. Throughout the year, there are 97.6 rainfall days, and 377mm (14.84") of precipitation is accumulated.Daylight
In September, the average length of the day in Grasmere is 11h and 57min.On the first day of the month, sunrise is at 06:20 and sunset at 17:56. On the last day of September, in Grasmere, sunrise is at 05:48 and sunset at 18:08 SAST.
Sunshine
The average sunshine in September is 9.6h.UV index
The average daily maximum UV index in September in Grasmere is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum daily UV index of 5 in September converts into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Frequently asked questions
What is the usual temperature for Grasmere in September?
What is the least humid month in Grasmere?
What is the average humidity in September in Grasmere?
How many days does it rain in September in Grasmere?
What is the average length of the day in September in Grasmere?
When is the sunrise / sunset in September in Grasmere?
How many hours of sunshine does Grasmere have in September?
How high is the UV index in September in Grasmere?
Average temperature in September
Grasmere, South Africa
- Average high temperature in September: 25.7°C
The warmest month (with the highest average high temperature) is December (27.5°C).
The month with the lowest average high temperature is July (17.7°C).
- Average low temperature in September: 11.5°C
The months with the highest average low temperature are January and December (16.3°C).
The coldest month (with the lowest average low temperature) is July (5.9°C).
Average pressure in September
Grasmere, South Africa
- Average pressure in September: 1018.5mbar
The month with the highest atmospheric pressure is July (1024.7mbar).
The month with the lowest atmospheric pressure is January (1013.1mbar).
Average wind speed in September
Grasmere, South Africa
- Average wind speed in September: 11.8km/h
The windiest month (with the highest average wind speed) is November (12km/h).
The calmest month (with the lowest average wind speed) is May (7.9km/h).
Average humidity in September
Grasmere, South Africa
- Average humidity in September: 33%
The months with the highest relative humidity are January and February (63%).
The month with the lowest relative humidity is September (33%).
Average rainfall in September
Grasmere, South Africa
- Average rainfall in September: 5mm
The wettest month (with the highest rainfall) is December (86mm).
The driest month (with the least rainfall) is July (0mm).
Average rainfall days in September
Grasmere, South Africa
- Average rainfall days in September: 2.5 days
The month with the highest number of rainy days is January (17.8 days).
The months with the least rainy days are July and August (0.8 days).
Average daylight in September /
Average sunshine in September
Grasmere, South Africa
- Average daylight in September: 11h and 5min
The month with the longest days is December (Average daylight: 13h and 48min).
The month with the shortest days is June (Average daylight: 10h and 30min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is October (Average sunshine: 11h and 48min).
The month with the least sunshine is August (Average sunshine: 7h and 24min).
Average sunshine days in September
Grasmere, South Africa
- Average sunshine days in September: 27.1 days
The month with the most sunshine days is July (30.1 days).
The month with the least sunshine days is January (10.8 days).
Average UV index in September
Grasmere, South Africa
- Average UV index in September: 5
The months with the highest UV index are January, October, November and December (UV index 6).
The months with the lowest UV index are May, June and July (UV index 4).
Average cloud cover in September
Grasmere, South Africa
- Average cloud cover in September: 8
The month with the most cloud cover is January (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in September
Grasmere, South Africa
- Average visibility in September: 10km
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).
Grasmere, South Africa
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