September weather forecastAlva, OK
September
Weather in September
September introduces a perceptible change in the Alva weather as it transitions into autumn. The temperatures decline significantly from the scorching summer highs of the previous months, ushering in a welcome coolness. Relative humidity and daylight hours both decrease compared to August, heralding in the arrival of autumn. The maximum recorded temperature takes a dip to 84.7°F (29.3°C), considerably cooler than the summer highs. September paves the way for a cooler October, and Alva begins to prep for the winters.Temperature
The beginning of September brings a minor change in the average high-temperature, shifting from a tropical 93°F (33.9°C) in August to a moderately hot 84.7°F (29.3°C). In September, Alva records an average nighttime temperature of 66°F (18.9°C).Heat index
The heat index for September is computed to be a hot 87.8°F (31°C). Enduring exposure and unrelenting activity might cause a state of weariness, potentially leading to heat cramps.Observations indicate that the heat index values are for shady locations with light wind. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', integrates the air's temperature and its humidity to showcase the felt temperature by people. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
Humidity
The average relative humidity in September is 59%.Rainfall
In Alva, during September, the rain falls for 11.7 days and regularly aggregates up to 1.54" (39mm) of precipitation. Throughout the year, there are 105.5 rainfall days, and 18.11" (460mm) of precipitation is accumulated.Snowfall
In Alva, snow does not fall in May through September.Daylight
In September, the average length of the day in Alva is 12h and 24min.On the first day of the month, sunrise is at 7:06 am and sunset at 8:02 pm. On the last day of September, 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 is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the average person.Note: The daily maximum UV index of 6 in September interprets into the following advice:
Deter overexposure. Protecting against the sun's effects is essential. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
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 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- 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).
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).
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).
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).
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).
