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
September
Weather in September
Temperature
As August transitions into September, Casteel records an average high-temperature of a still warm 27.5°C (81.5°F), showing a gentle shift from the preceding month. Casteel sees a major change from daytime highs, with the nighttime temperature dipping to a moderate 15.4°C (59.7°F) on average during September.Heat index
September's mean heat index is estimated at 28°C (82.4°F). Prolonged exposure combined with continuous activity could lead to exhaustion, and possibly heat cramps.Heat index readings emphasize conditions of light breezes and shaded spots. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
Humidity
With an average relative humidity of 52%, September is the least humid month.Rainfall
In Casteel, during September, the rain falls for 6.5 days and regularly aggregates up to 10mm (0.39") of precipitation. In Casteel, during the entire year, the rain falls for 145.7 days and collects up to 558mm (21.97") of precipitation.Daylight
In September, the average length of the day in Casteel is 11h and 58min.On the first day of September in Casteel, sunrise is at 06:06 and sunset at 17:44. On the last day of the month, sunrise is at 05:36 and sunset at 17:55 SAST.
Sunshine
In September, the average sunshine is 8.3h.UV index
The months with the highest UV index are January through April, September through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Casteel?
What is the least humid month in Casteel?
What is the average humidity in September in Casteel?
How much does it rain in Casteel in September?
What is the average length of the day in September in Casteel?
When is the sunrise / sunset in September in Casteel?
How many hours of sunshine does Casteel have in September?
When is the highest UV index in Casteel?
What is the UV index reading in September in Casteel?
Average temperature in September
Casteel, South Africa
- Average high temperature in September: 27.5°C
The warmest months (with the highest average high temperature) are February and December (29.2°C).
The month with the lowest average high temperature is July (22.8°C).
- Average low temperature in September: 15.4°C
The month with the highest average low temperature is January (19.4°C).
The coldest month (with the lowest average low temperature) is July (11.2°C).
Average pressure in September
Casteel, South Africa
- Average pressure in September: 1019.2mbar
The month with the highest atmospheric pressure is July (1024mbar).
The month with the lowest atmospheric pressure is January (1013.3mbar).
Average wind speed in September
Casteel, South Africa
- Average wind speed in September: 10.3km/h
The windiest month (with the highest average wind speed) is October (10.4km/h).
The calmest month (with the lowest average wind speed) is May (7.4km/h).
Average humidity in September
Casteel, South Africa
- Average humidity in September: 52%
The month with the highest relative humidity is January (74%).
The month with the lowest relative humidity is September (52%).
Average rainfall in September
Casteel, South Africa
- Average rainfall in September: 10mm
The wettest month (with the highest rainfall) is December (116mm).
The driest months (with the least rainfall) are June and July (3mm).
Average rainfall days in September
Casteel, South Africa
- Average rainfall days in September: 6.5 days
The month with the highest number of rainy days is January (20.9 days).
The month with the least rainy days is June (2.3 days).
Average daylight in September /
Average sunshine in September
Casteel, South Africa
- Average daylight in September: 12h and 0min
The month with the longest days is December (Average daylight: 13h and 36min).
The month with the shortest days is June (Average daylight: 10h and 36min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is February (Average sunshine: 9h and 42min).
The month with the least sunshine is April (Average sunshine: 6h and 18min).
Average sunshine days in September
Casteel, South Africa
- Average sunshine days in September: 21 days
The month with the most sunshine days is June (26.3 days).
The month with the least sunshine days is January (6.9 days).
Average UV index in September
Casteel, South Africa
- Average UV index in September: 6
The months with the highest UV index are January, February, March, April, September, October, November and December (UV index 6).
The months with the lowest UV index are May, June, July and August (UV index 5).
Average cloud cover in September
Casteel, South Africa
- Average cloud cover in September: 21
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 12).
Average visibility in September
Casteel, South Africa
- Average visibility in September: 10km
The months with the highest visibility are June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, April, May, November and December (9km).
