September weather forecast and climate
Chelsea, AL

September, the first month of the autumn, in Chelsea, is also a moderately hot month, with average temperature varying between 85.1°F (29.5°C) and 66°F (18.9°C).

Temperature

In Chelsea, the average high-temperature is relatively the same as in August - a moderately hot 85.1°F (29.5°C). The average low-temperature, in September, is 66°F (18.9°C).

Heat index

In September, the average heat index is evaluated at a hot 93.7°F (34.3°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like clothing, differences in body mass, height, and shape, wind, and activity influence one's weather impression. 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 especially crucial for babies and toddlers. 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 Chelsea is 72%.

Rainfall

September and October are months with the least rain when the rain falls for 14.3 days and typically aggregates up to 2.36" (60mm) of rain.

Snowfall

In Chelsea, Alabama, snow does not fall in April through October.

Daylight

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

Sunshine

In September, the average sunshine is 9h.

UV index

The average daily maximum UV index in Chelsea is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Chelsea?

In September, in Chelsea, the average high-temperature is 85.1°F (29.5°C), and the average low-temperature is 66°F (18.9°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), that factores the actual air temperature with the relative humidity, in September is evaluated at 93.7°F (34.3°C).

What is the average humidity in September in Chelsea?

In September, the average relative humidity in Chelsea is 72%.

How many days does it rain in September in Chelsea?

In September, in Chelsea, the rain falls for 14.3 days. Throughout September, 2.36" (60mm) of precipitation is accumulated.

What is the driest month in Chelsea?

September and October are months with the least rain in Chelsea, Alabama, when the rain falls for 14.3 days and typically aggregates up to 2.36" (60mm) of rain.

When it does not snow in Chelsea?

In Chelsea, Alabama, snow does not fall in April through October.

What is the average length of the day in September in Chelsea?

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

How many hours of sunshine does Chelsea have in September?

In September, the average sunshine in Chelsea, Alabama, is 9h.

How high is the UV index in September in Chelsea?

In Chelsea, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.
Average temperature in September - Chelsea, AL
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is July (90.5°F).
The month with the lowest average high temperature is January (51.1°F).

  • Average low temperature in September: 66°F

The month with the highest average low temperature is August (71.4°F).
The coldest month (with the lowest average low temperature) is January (36°F).

Average pressure in September - Chelsea, AL
  • Average pressure in September: 30.01"

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

Average wind speed in September - Chelsea, AL
  • Average wind speed in September: 4.9mph

The windiest months (with the highest average wind speed) are February and March (7.3mph).
The calmest months (with the lowest average wind speed) are July and August (4.4mph).

Average humidity in September - Chelsea, AL
  • Average humidity in September: 72%

The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (71%).

Average rainfall in September - Chelsea, AL
  • Average rainfall in September: 2.36"

The wettest month (with the highest rainfall) is April (4.09").
The driest months (with the least rainfall) are September and October (2.36").

Average rainfall days in September - Chelsea, AL
  • Average rainfall days in September: 14.3 days

The month with the highest number of rainy days is July (21.8 days).
The month with the least rainy days is November (9.3 days).

Average snowfall in September - Chelsea, AL
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.79").
Months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September - Chelsea, AL
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (1.2 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 9h

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

Average sunshine days in September - Chelsea, AL
  • Average sunshine days in September: 13.5 days

The month with the most sunshine days is October (19.7 days).
The month with the least sunshine days is July (7.3 days).

Average UV index in September - Chelsea, AL
  • Average UV index in September: 5

The month with the highest UV index is August (UV index 7).
Months with the lowest UV index are January, February and December (UV index 3).

Average cloud cover in September - Chelsea, AL
  • Average cloud cover in September: 29

The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is September (Cloud cover 29).

Average visibility in September - Chelsea, 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).