September weather forecast
Alva, OK

Weather in September

The first month of the autumn, September, is also a moderately hot month in Alva, Oklahoma, with an average temperature varying between 66°F (18.9°C) and 84.7°F (29.3°C).

Temperature

In September, the average high-temperature slightly decreases from a hot 93°F (33.9°C) in August to a moderately hot 84.7°F (29.3°C). In September, in Alva, the average low-temperature is 66°F (18.9°C).

Heat index

The average heat index in September is calculated to be a tropical 88.5°F (31.4°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, wind, metabolic differences). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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 is 59%.

Rainfall

In Alva, during 11.7 rainfall days, 1.54" (39mm) of precipitation is typically accumulated. In Alva, during the entire year, the rain falls for 105.5 days and collects up to 18.11" (460mm) of precipitation.

Snowfall

In Alva, snow does not fall in May through September.

Daylight

In Alva, the average length of the day in September is 12h and 24min.
On the first day of September, sunrise is at 7:05 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 7:19 pm CDT.

Sunshine

The average sunshine in September is 9.1h.

UV index

The average daily maximum UV index in September in Alva is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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 Alva?

In September, in Alva, Oklahoma, the average high-temperature is 84.7°F (29.3°C), and the average low-temperature is 66°F (18.9°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in September is calculated to be 88.5°F (31.4°C).

What is the average humidity in September in Alva?

The average relative humidity in September is 59%.

How much does it rain in Alva in September?

In Alva, during September, the rain falls for 11.7 days and regularly aggregates up to 1.54" (39mm) of precipitation.

When it does not snow in Alva?

In Alva, snow does not fall in May through September.

Does it snow in Alva in September?

In Alva, Oklahoma, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Alva have in September?

The average day length in September in Alva is 12h and 24min.

When is the sunrise / sunset in September in Alva?

In September, on the first day of the month, sunrise is at 7:05 am and sunset at 8:03 pm. On the last day of the month, in Alva, Oklahoma, sunrise is at 7:29 am and sunset at 7:19 pm CDT.

How many hours of sunshine does Alva have in September?

In September, the average sunshine duration in Alva is 9.1h.

What is the UV index reading in September in Alva?

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

Average temperature in September
Alva, OK

Average temperature in September - Alva, OK
  • Average high temperature in September: 84.7°F

The warmest month (with the highest average high temperature) is July (95.4°F).
The month with the lowest average high temperature is January (46.6°F).

  • Average low temperature in September: 66°F

The month with the highest average low temperature is July (74.8°F).
The coldest month (with the lowest average low temperature) is January (29.8°F).

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Average pressure in September
Alva, OK

Average pressure in September - Alva, OK
  • Average pressure in September: 29.98"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

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Average wind speed in September
Alva, OK

Average wind speed in September - Alva, OK
  • Average wind speed in September: 9.8mph

The windiest month (with the highest average wind speed) is April (12mph).
The calmest month (with the lowest average wind speed) is August (9mph).

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Average humidity in September
Alva, OK

Average humidity in September - Alva, OK
  • Average humidity in September: 59%

The month with the highest relative humidity is May (65%).
The month with the lowest relative humidity is July (53%).

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Average rainfall in September
Alva, OK

Average rainfall in September - Alva, OK
  • Average rainfall in September: 1.54"

The wettest month (with the highest rainfall) is May (3.43").
The driest months (with the least rainfall) are January, February, November and December (0.63").

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Average rainfall days in September
Alva, OK

Average rainfall days in September - Alva, OK
  • Average rainfall days in September: 11.7 days

The month with the highest number of rainy days is May (12.9 days).
The month with the least rainy days is January (3.7 days).

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Average snowfall in September
Alva, OK

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

The month with the highest snowfall is February (1.73").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Alva, OK

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

The month with the highest number of snowfall days is February (3.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Alva, OK
  • Average daylight in September: 12h and 24min

The month with the longest days is June (Average daylight: 14h and 38min).
The month with the shortest days is December (Average daylight: 9h and 41min).

  • Average sunshine in September: 9h and 6min

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 24min).

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Average sunshine days in September
Alva, OK

Average sunshine days in September - Alva, OK
  • Average sunshine days in September: 15.5 days

The month with the most sunshine days is January (25.2 days).
The month with the least sunshine days is September (15.5 days).

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Average UV index in September
Alva, OK

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

The month with the highest UV index is June (UV index 8).
The months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in September
Alva, OK

Average cloud cover in September - Alva, OK
  • Average cloud cover in September: 22

The months with the most cloud cover are March and April (Cloud cover 32).
The month with the least cloud cover is June (Cloud cover 17).

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Average visibility in September
Alva, OK

Average visibility in September - Alva, 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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