September weather forecast
Ulmer, SC

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Weather in September

September, the first month of the autumn in Ulmer, is also a moderately hot month, with an average temperature fluctuating between 68.2°F (20.1°C) and 84.9°F (29.4°C).

Temperature

Entering September, the average high-temperature is recorded at a warm 84.9°F (29.4°C), exhibiting a minimal shift from August's 89.8°F (32.1°C). In Ulmer, September's nights observe an average temperature dip to a pleasant 68.2°F (20.1°C).

Heat index

September's mean heat index is estimated at a fiery hot 95°F (35°C). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', ties air temperature with relative humidity to produce the perceived temperature sensation. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are especially crucial for babies and toddlers. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

The average relative humidity in September is 75%.

Rainfall

In September, the rain falls for 13.9 days. Throughout September, 1.97" (50mm) of precipitation is accumulated. Throughout the year, there are 152.9 rainfall days, and 31.18" (792mm) of precipitation is accumulated.

Snowfall

March through December are months without snowfall.

Daylight

The average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:59 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:18 am and sunset at 7:10 pm EDT.

Sunshine

In Ulmer, the average sunshine in September is 8.4h.

UV index

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 6 suggests this advice:
Shun overexposure. Protection from sun ravages is indispensable. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Updated: Aug 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it hot during September?

In September, in Ulmer, the average high-temperature is 84.9°F (29.4°C), and the average low-temperature is 68.2°F (20.1°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in September is estimated at 95°F (35°C).

What is the average humidity in September in Ulmer?

In Ulmer, the average relative humidity in September is 75%.

How much does it rain in September?

In Ulmer, during September, the rain falls for 13.9 days and regularly aggregates up to 1.97" (50mm) of precipitation.

When it does not snow?

In Ulmer, South Carolina, snow does not fall in March through December.

How many hours of daylight does Ulmer have in September?

In Ulmer, South Carolina, the average day length in September is 12h and 22min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 6:59 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:10 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.4h.

What is the UV index reading in September in Ulmer?

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Ulmer, SC

Average temperature in September - Ulmer, SC
  • Average high temperature in September: 84.9°F

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (55.4°F).

  • Average low temperature in September: 68.2°F

The month with the highest average low temperature is July (73.2°F).
The coldest month (with the lowest average low temperature) is January (39.9°F).

Average pressure in September
Ulmer, SC

Average pressure in September - Ulmer, SC
  • Average pressure in September: 30"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).

Average wind speed in September
Ulmer, SC

Average wind speed in September - Ulmer, SC
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in September
Ulmer, SC

Average humidity in September - Ulmer, SC
  • Average humidity in September: 75%

The months with the highest relative humidity are August and December (76%).
The month with the lowest relative humidity is January (70%).

Average rainfall in September
Ulmer, SC

Average rainfall in September - Ulmer, SC
  • Average rainfall in September: 1.97"

The wettest month (with the highest rainfall) is August (3.7").
The driest month (with the least rainfall) is November (1.38").

Average rainfall days in September
Ulmer, SC

Average rainfall days in September - Ulmer, SC
  • Average rainfall days in September: 13.9 days

The month with the highest number of rainy days is August (20.8 days).
The month with the least rainy days is November (6.6 days).

Average snowfall in September
Ulmer, SC

Average snowfall in September - Ulmer, SC
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.12").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").

Average snowfall days in September
Ulmer, SC

Average snowfall days in September - Ulmer, SC
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

Average daylight in September /
Average sunshine in September
Ulmer, SC

Average daylight in September / Average sunshine in September - Ulmer, SC
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 8h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).

Average sunshine days in September
Ulmer, SC

Average sunshine days in September - Ulmer, SC
  • Average sunshine days in September: 14.3 days

The month with the most sunshine days is November (22.3 days).
The month with the least sunshine days is August (7.3 days).

Average UV index in September
Ulmer, SC

Average UV index in September - Ulmer, SC
  • Average UV index in September: 6

The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).

Average cloud cover in September
Ulmer, SC

Average cloud cover in September - Ulmer, SC
  • Average cloud cover in September: 33

The months with the most cloud cover are February and December (Cloud cover 43).
The month with the least cloud cover is October (Cloud cover 29).

Average visibility in September
Ulmer, SC

Average visibility in September - Ulmer, SC
  • 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).

Ulmer, South Carolina, USA

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