September weather forecast
Altus, OK

Weather in September

The first month of the autumn, September, is still a tropical month in Altus, Oklahoma, with an average temperature fluctuating between 67.8°F (19.9°C) and 86.7°F (30.4°C).

Temperature

In September, the average high-temperature drops from a sweltering 95.7°F (35.4°C) in August to a tropical 86.7°F (30.4°C). The average low-temperature, in Altus, is 67.8°F (19.9°C).

Heat index

In September, the average heat index is computed to be a hot 91.4°F (33°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, clothing, pregnancy, and wind affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In September, the average relative humidity in Altus is 58%.

Rainfall

In Altus, it is raining for 12.3 days, with typically 2.09" (53mm) of accumulated precipitation. In Altus, during the entire year, the rain falls for 104.5 days and collects up to 20.59" (523mm) of precipitation.

Snowfall

In Altus, snow does not fall in May through October.

Daylight

The average length of the day in September is 12h and 23min.
On the first day of September in Altus, sunrise is at 7:10 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:23 pm CDT.

Sunshine

In Altus, Oklahoma, the average sunshine in September is 8.9h.

UV index

In September, the average daily maximum UV index in Altus is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Altus?

In Altus, Oklahoma, in September, the average high-temperature is 86.7°F (30.4°C), and the average low-temperature is 67.8°F (19.9°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in September is computed to be 91.4°F (33°C).

What is the average humidity in September in Altus?

In September, the average relative humidity in Altus is 58%.

How much does it rain in Altus in September?

In September, in Altus, the rain falls for 12.3 days. Throughout September, 2.09" (53mm) of precipitation is accumulated.

When it does not snow in Altus?

In Altus, Oklahoma, snow does not fall in May through October.

How many hours of daylight does Altus have in September?

In September, the average day length in Altus is 12h and 23min.

When are sunrise and sunset in September in Altus?

On the first day of September in Altus, sunrise is at 7:10 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:23 pm CDT.

How long on average sun shines in September in Altus?

The average sunshine duration in September is 8.9h.

What is the UV index reading in September in Altus?

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Altus, OK

Average temperature in September - Altus, OK
  • Average high temperature in September: 86.7°F

The warmest month (with the highest average high temperature) is July (96.4°F).
The month with the lowest average high temperature is December (51.6°F).

  • Average low temperature in September: 67.8°F

The month with the highest average low temperature is July (76.3°F).
The coldest month (with the lowest average low temperature) is January (33.4°F).

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Average pressure in September
Altus, OK

Average pressure in September - Altus, OK
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in September
Altus, OK

Average wind speed in September - Altus, OK
  • Average wind speed in September: 9.2mph

The windiest month (with the highest average wind speed) is April (12.4mph).
The calmest month (with the lowest average wind speed) is August (8.9mph).

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Average humidity in September
Altus, OK

Average humidity in September - Altus, OK
  • Average humidity in September: 58%

The months with the highest relative humidity are May and December (60%).
The month with the lowest relative humidity is August (49%).

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Average rainfall in September
Altus, OK

Average rainfall in September - Altus, OK
  • Average rainfall in September: 2.09"

The wettest month (with the highest rainfall) is May (3.35").
The driest months (with the least rainfall) are February and November (0.75").

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Average rainfall days in September
Altus, OK

Average rainfall days in September - Altus, OK
  • Average rainfall days in September: 12.3 days

The month with the highest number of rainy days is May (13.2 days).
The month with the least rainy days is January (3.8 days).

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Average snowfall in September
Altus, OK

Average snowfall in September - Altus, OK
  • Average snowfall in September: 0"

The month with the highest snowfall is February (0.98").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Altus, OK

Average snowfall days in September - Altus, OK
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Altus, OK

Average daylight in September / Average sunshine in September - Altus, OK
  • Average daylight in September: 12h and 23min

The month with the longest days is June (Average daylight: 14h and 26min).
The month with the shortest days is December (Average daylight: 9h and 53min).

  • Average sunshine in September: 8h and 54min

The month with the most sunshine is June (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).

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Average sunshine days in September
Altus, OK

Average sunshine days in September - Altus, OK
  • Average sunshine days in September: 15.3 days

The month with the most sunshine days is January (25.9 days).
The month with the least sunshine days is August (15.1 days).

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Average UV index in September
Altus, OK

Average UV index in September - Altus, OK
  • Average UV index in September: 6

The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).

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Average cloud cover in September
Altus, OK

Average cloud cover in September - Altus, OK
  • Average cloud cover in September: 24

The month with the most cloud cover is March (Cloud cover 29).
The months with the least cloud cover are June and August (Cloud cover 17).

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Average visibility in September
Altus, OK

Average visibility in September - Altus, OK
  • 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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