September weather forecastOpelika, AL
September
Weather in September
September signals the beginning of autumn in Opelika, with noticeable reductions in temperature, UV index, and daylight hours. Outdoor activities continue under increasingly comfortable conditions as the oppressive summer heat dissipates. The wind speed increases marginally, creating a lovely breeze that complements the cooler weather. An appreciable drop in rainfall also marks this month making it a pleasant time for the locals. September experiences average temperatures fluctuating from 86°F (30°C) down to 66.7°F (19.3°C).Temperature
Opelika experiences a transition to a still hot 86°F (30°C) in average high-temperatures with the arrival of September, not greatly differing from August's 90.3°F (32.4°C). Opelika reports a consistent average low-temperature of 66.7°F (19.3°C) throughout September nights.Heat index
During September, the heat index is computed to be a torrid 96.8°F (36°C). Exercise special caution, heat exhaustion and heat cramps are probable. Prolonged activity may induce heatstroke.Understanding the heat index involves considering values for shaded locales with light wind. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', quantifies the warmth felt when relative humidity is considered. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
Normally, the human body cools itself through perspiration, which removes excessive heat by evaporating sweat. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.
Humidity
The average relative humidity in September is 72%.Rainfall
September is the month with the least rainfall. Rain falls for 14.1 days and accumulates 2.01" (51mm) of precipitation.Snowfall
In Opelika, snow does not fall in April through November.Daylight
In September, the average length of the day is 12h and 22min.On the first day of the month, sunrise is at 6:16 am and sunset at 7:05 pm. On the last day of September, sunrise is at 6:35 am and sunset at 6:27 pm CDT.
Sunshine
The average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.Note: In September, a regular UV index of 6 translates into these guidelines:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Opelika, AL
- Average high temperature in September: 86°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (54.1°F).
- Average low temperature in September: 66.7°F
The months with the highest average low temperature are July and August (71.2°F).
The coldest month (with the lowest average low temperature) is January (37.4°F).
Average pressure in September
Opelika, AL
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Opelika, AL
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is January (7.7mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in September
Opelika, AL
- Average humidity in September: 72%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Opelika, AL
- Average rainfall in September: 2.01"
The wettest months (with the highest rainfall) are August and December (4.06").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in September
Opelika, AL
- Average rainfall days in September: 14.1 days
The month with the highest number of rainy days is July (22.5 days).
The month with the least rainy days is November (7.8 days).
Average snowfall in September
Opelika, AL
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.31").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Opelika, AL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Opelika, AL
- Average daylight in September: 12h and 24min
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 36min
The month with the most sunshine is June (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in September
Opelika, AL
- Average sunshine days in September: 14 days
The months with the most sunshine days are October and November (20.5 days).
The month with the least sunshine days is July (6.5 days).
Average UV index in September
Opelika, AL
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Opelika, AL
- Average cloud cover in September: 31
The month with the most cloud cover is December (Cloud cover 45).
The month with the least cloud cover is October (Cloud cover 30).
Average visibility in September
Opelika, AL
- 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).
