September weather forecast
Casteel, South Africa

September

Weather in September

The first month of the spring, September, is also a moderately hot month in Casteel, South Africa, with an average temperature varying between 59.7°F and 81.5°F.

Temperature

As August transitions into September, Casteel records an average high-temperature of a still warm 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 59.7°F on average during September.

Heat index

September's mean heat index is estimated at 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 0.39" of precipitation. In Casteel, during the entire year, the rain falls for 145.7 days and collects up to 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.

Frequently asked questions

What is the average September temperature in Casteel?
The high-temperature, in September, in Casteel, records 81.5°F, while the low-temperature is 59.7°F. The average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in September is estimated at 82.4°F.
What is the least humid month in Casteel?
The least humid month in Casteel, South Africa, is September, with an average relative humidity of 52%.
What is the average humidity in September in Casteel?
In September, the average relative humidity in Casteel is 52%.
How much does it rain in Casteel in September?
In September, in Casteel, South Africa, the rain falls for 6.5 days. Throughout September, 0.39" of precipitation is accumulated.
What is the average length of the day in September in Casteel?
In Casteel, South Africa, the average day length in September is 11h and 58min.
When is the sunrise / sunset in September in Casteel?
In September, on the first day of the month, sunrise is at 06:06 and sunset at 17:44. On the last day of the month, in Casteel, South Africa, sunrise is at 05:36 and sunset at 17:55 SAST.
How many hours of sunshine does Casteel have in September?
The average sunshine duration in September in Casteel is 8.3h.
When is the highest UV index in Casteel?
January through April, September through December, with an average maximum UV index of 6, are months with the highest UV index in Casteel, South Africa.
What is the UV index reading in September in Casteel?
The average daily maximum UV index in September in Casteel is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from unprotected exposure to UV radiation.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in September - Casteel, South Africa
Average temperature in September
Casteel, South Africa
  • Average high temperature in September: 81.5°F

The warmest months (with the highest average high temperature) are February and December (84.6°F).
The month with the lowest average high temperature is July (73°F).

  • Average low temperature in September: 59.7°F

The month with the highest average low temperature is January (66.9°F).
The coldest month (with the lowest average low temperature) is July (52.2°F).

Average pressure in September - Casteel, South Africa
Average pressure in September
Casteel, South Africa
  • Average pressure in September: 30.1"Hg

The month with the highest atmospheric pressure is July (30.24"Hg).
The month with the lowest atmospheric pressure is January (29.92"Hg).

Average wind speed in September - Casteel, South Africa
Average wind speed in September
Casteel, South Africa
  • Average wind speed in September: 6.4mph

The windiest month (with the highest average wind speed) is October (6.5mph).
The calmest month (with the lowest average wind speed) is May (4.6mph).

Average humidity in September - Casteel, South Africa
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
Casteel, South Africa
  • Average rainfall in September: 0.39"

The wettest month (with the highest rainfall) is December (4.57").
The driest months (with the least rainfall) are June and July (0.12").

Average rainfall days in September - Casteel, South Africa
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 /
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
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
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
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
Casteel, South Africa
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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