September weather forecast and climate
Bonny Brook, AL

September, the first month of the autumn, in Bonny Brook, is still a warm month, with average temperature varying between 83.7°F (28.7°C) and 63.9°F (17.7°C).

Temperature

In Bonny Brook, Alabama, the average high-temperature is almost the same as in August - a moderately hot 83.7°F (28.7°C). In September, the average low-temperature is 63.9°F (17.7°C).

Heat index

In September, the average heat index is evaluated at a tropical 91.4°F (33°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (differences in body mass, height, and shape, metabolic differences, clothing). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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

The average relative humidity in September is 75%.

Rainfall

In Bonny Brook, during 13.7 rainfall days, 2.56" (65mm) of precipitation is typically accumulated. In Bonny Brook, during the entire year, the rain falls for 178.5 days and collects up to 38.78" (985mm) of precipitation.

Snowfall

In Bonny Brook snow does not fall in April through November.

Daylight

In September, the average length of the day in Bonny Brook is 12.4h.

Sunshine

The average sunshine in Bonny Brook is 8.7h.

UV index

The average daily maximum UV index in Bonny Brook, Alabama, is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Bonny Brook?

The average high-temperature, in September, in Bonny Brook, Alabama, is 83.7°F (28.7°C), while the average low-temperature is 63.9°F (17.7°C). In September, the average heat index (a.k.a. 'apparent temperature', 'feels like'), that combines relative humidity and air temperature, is evaluated at 91.4°F (33°C).

What is the average humidity in September in Bonny Brook?

In September, the average relative humidity in Bonny Brook is 75%.

How much does it rain in Bonny Brook in September?

In Bonny Brook, Alabama, during September, the rain falls for 13.7 days and regularly aggregates up to 2.56" (65mm) of precipitation.

When it does not snow in Bonny Brook?

April through November are months without snowfall.

How many hours of daylight does Bonny Brook have in September?

In Bonny Brook, Alabama, the average length of the day in September is 12.4h.

How many hours of sunshine does Bonny Brook have in September?

In Bonny Brook, Alabama, the average sunshine in September is 8.7h.

What is the UV index intensity in September in Bonny Brook?

In Bonny Brook, Alabama, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.
Average temperature in September - Bonny Brook, AL
  • Average high temperature in September: 83.7°F

The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (50°F).

  • Average low temperature in September: 63.9°F

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (34.3°F).

Average pressure in September - Bonny Brook, AL
  • Average pressure in September: 30.02"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.98").

Average wind speed in September - Bonny Brook, AL
  • Average wind speed in September: 4.5mph

The windiest month (with the highest average wind speed) is February (7.3mph).
The calmest month (with the lowest average wind speed) is August (4mph).

Average humidity in September - Bonny Brook, AL
  • Average humidity in September: 75%

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (73%).

Average rainfall in September - Bonny Brook, AL
  • Average rainfall in September: 2.56"

The wettest month (with the highest rainfall) is December (3.78").
The driest month (with the least rainfall) is October (2.24").

Average rainfall days in September - Bonny Brook, AL
  • Average rainfall days in September: 13.7 days

The month with the highest number of rainy days is July (22.7 days).
The month with the least rainy days is November (9.4 days).

Average snowfall in September - Bonny Brook, AL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.83").
Months with the least snowfall are April, May, June, July, August, September, October and November (0").

Average snowfall days in September - Bonny Brook, AL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (1.4 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Bonny Brook, AL
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 8.7h

The month with the most sunshine is June (Average sunshine: 10.7h).
The month with the least sunshine is February (Average sunshine: 4.9h).

Average sunshine days in September - Bonny Brook, AL
  • Average sunshine days in September: 13.5 days

The month with the most sunshine days is October (19 days).
The month with the least sunshine days is July (7.3 days).

Average UV index in September - Bonny Brook, AL
  • Average UV index in September: 5

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 - Bonny Brook, AL
  • Average cloud cover in September: 30

Months with the most cloud cover are February and December (Cloud cover 47).
Months with the least cloud cover are June and September (Cloud cover 30).

Average visibility in September - Bonny Brook, AL
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).