September weather forecastBella Vista, AR
September
Weather in September
September welcomes the onset of fall, transitioning Bella Vista from the harsh grasp of summer witnessed in August. The city lives through comfortable weather conditions, neither exceedingly hot nor overwhelmingly cool. Leaves begin to change their colors, announcing the arrival of Autumn. The weather in September radiates an aura that resonates perfectly with the gold, orange, and brown hues of Autumn.Temperature
The shift from August to September coincides with a small decrease in the average high-temperature, down to a warm 81.1°F (27.3°C) from a hot 88.2°F (31.2°C). Bella Vista throughout September, experiences an average nighttime temperature of 60.6°F (15.9°C).Heat index
For most parts of September, the heat index is evaluated at a hot 86°F (30°C). Persisting in activity during exposure could lead to weariness and subsequently to heat cramps.Heat index determinations are made taking into account the shade and light air movements. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', binds temperature metrics with humidity values to give a sense of the actual warmth. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
Humidity
In Bella Vista, the average relative humidity in September is 73%.Rainfall
In Bella Vista, in September, during 12.8 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. Throughout the year, there are 141.8 rainfall days, and 31.5" (800mm) of precipitation is accumulated.Snowfall
In Bella Vista, snow does not fall in June through October.Daylight
In Bella Vista, the average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 6:49 am and sunset at 7:44 pm. On the last day of September, sunrise is at 7:12 am and sunset at 7:01 pm CDT.
Sunshine
In September, the average sunshine is 9.5h.UV index
The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 5 during September leads to these instructions:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bella Vista, AR
- Average high temperature in September: 81.1°F
The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is January (44.1°F).
- Average low temperature in September: 60.6°F
The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (27.9°F).
Average pressure in September
Bella Vista, AR
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Bella Vista, AR
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in September
Bella Vista, AR
- Average humidity in September: 73%
The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Bella Vista, AR
- Average rainfall in September: 2.17"
The wettest month (with the highest rainfall) is May (4.41").
The driest month (with the least rainfall) is February (1.57").
Average rainfall days in September
Bella Vista, AR
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is January (7.6 days).
Average snowfall in September
Bella Vista, AR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.98").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Bella Vista, AR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Bella Vista, AR
- 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 30min
The months with the most sunshine are July and August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days in September
Bella Vista, AR
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is December (20.3 days).
The month with the least sunshine days is April (13.7 days).
Average UV index in September
Bella Vista, AR
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Bella Vista, AR
- Average cloud cover in September: 28
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
Bella Vista, AR
- 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).
