September weather forecastMountain View, AR
September
Weather in September
September paints a beautiful picture in Mountain View, the essence of fall starts to creep in with dropping temperatures and decreasing rainfall. The climate transition from the hot summer to the cooler fall becomes quite apparent. The temperatures slide into comfort, moving from 61.3°F (16.3°C) to 82°F (27.8°C). Despite the temperature drop, Mountain View experiences rather long sunshine hours. This pleasant weather provides perfect conditions for enjoying the city's scenic beauty, making September an ideal month for outdoor pursuits.Temperature
September ushers in a minor alteration in Mountain View's climate, with the average high-temperature moving from August's tropical 89.4°F (31.9°C) to a warm 82°F (27.8°C). The low-temperature averages to a refreshing 61.3°F (16.3°C) during the nights of September.Heat index
The heat index for September is estimated at a tropical 87.8°F (31°C). Ongoing exposure and activity could lead to a state of exhaustion, with a chance of heat cramps.One should consider that heat index numbers are for shaded settings and light wind. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'feels like' or 'apparent temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are especially vital to children. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
Humidity
The average relative humidity in September is 75%.Rainfall
The month with the least rainfall is September, when the rain falls for 12.9 days and typically collects 1.97" (50mm) of precipitation.Snowfall
May through October are months without snowfall in Mountain View.Daylight
In Mountain View, the average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:40 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:53 pm CDT.
Sunshine
The average sunshine in September is 9.4h.UV index
The average daily maximum UV index in September in Mountain View is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the maximum UV index of 5 suggests this advice:
Take necessary precautions - Defending against sun damage is advocated. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mountain View, AR
- Average high temperature in September: 82°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (45.1°F).
- Average low temperature in September: 61.3°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 (30°F).
Average pressure in September
Mountain View, AR
- Average pressure in September: 30.01"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
Mountain View, AR
- Average wind speed in September: 4.9mph
The windiest month (with the highest average wind speed) is April (7.7mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Mountain View, AR
- Average humidity in September: 75%
The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Mountain View, AR
- Average rainfall in September: 1.97"
The wettest month (with the highest rainfall) is April (4.21").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days in September
Mountain View, AR
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is January (9.1 days).
Average snowfall in September
Mountain View, AR
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Mountain View, AR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Mountain View, 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 48min).
- Average sunshine in September: 9h and 24min
The months with the most sunshine are June and July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in September
Mountain View, AR
- Average sunshine days in September: 14.4 days
The month with the most sunshine days is December (19.5 days).
The month with the least sunshine days is August (10.8 days).
Average UV index in September
Mountain View, AR
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Mountain View, AR
- Average cloud cover in September: 29
The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in September
Mountain View, AR
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).
