Jackson
Mississippi, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Jackson, MS

The view of the Capitol building in Jackson, Mississippi, from a beautiful tree park
The view of the Capitol building in Jackson, Mississippi, from a beautiful tree park
The first month of the autumn, September, is also a hot month in Jackson, Mississippi, with average temperature ranging between max 86.7°F (30.4°C) and min 64.6°F (18.1°C).

Temperature

In Jackson, Mississippi, the average high-temperature in September is relatively the same as in August - a still hot 86.7°F (30.4°C). The average low-temperature, is 64.6°F (18.1°C).

Heat index

The average heat index is estimated at a sweltering 100.6°F (38.1°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
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 'apparent temperature', 'real feel', 'feels like', or 'felt air temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like differences in body mass, height, and shape, wind, metabolic differences, 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.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

With an average relative humidity of 77.3%, September is the most humid month.

Rainfall

The month with the least rainfall is September when the rain falls for 7 days and typically collects 3" (77mm) of precipitation.

Daylight

The average length of the day in September is 12.4h.

Sunshine

The average sunshine in September is 7.8h.

UV index

The average daily maximum UV index in September is 8. A UV Index of 8 to 10 symbolizes a very high health risk from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 8 in September transform into the following instructions:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Jackson?

The average high-temperature, in September, in Jackson, Mississippi, is 86.7°F (30.4°C), while the average low-temperature is 64.6°F (18.1°C). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that combines both air temperature and relative humidity, is estimated at 100.6°F (38.1°C).

What is the most humid month in Jackson?

The most humid month in Jackson is September, with an average relative humidity of 77.3%.

What is the average humidity in September in Jackson?

In September, the average relative humidity in Jackson, Mississippi, is 77.3%.

How many days does it rain in September in Jackson?

In Jackson, Mississippi, during September, the rain falls for 7 days and regularly aggregates up to 3" (77mm) of precipitation.

What is the driest month in Jackson?

September is the month with the least rainfall. Rain falls for 7 days and accumulates 3" (77mm) of precipitation.

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

The average length of the day in September in Jackson is 12.4h.

How long on average sun shines in September in Jackson?

In Jackson, the average sunshine in September is 7.8h.

How high is the UV index in September in Jackson?

The average daily maximum UV index in September is 8. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from the exposure to the Sun's UV rays.
Average temperature in September - Jackson, MS
  • Average high temperature in September: 86.7°F

Warmest months (with the highest average high temperature) are July and August (91.6°F).
The month with the lowest average high temperature is January (56.1°F).

  • Average low temperature in September: 64.6°F

The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is January (35.3°F).

Average humidity in September - Jackson, MS
  • Average humidity in September: 77.3%

The month with the highest relative humidity is September (77.3%).
The month with the lowest relative humidity is March (71.1%).

Average rainfall in September - Jackson, MS
  • Average rainfall in September: 3"

The wettest month (with the highest rainfall) is December (5.2").
The driest month (with the lowest rainfall) is September (3").

Average rainfall days in September - Jackson, MS
  • Average rainfall days in September: 7 days

The month with the highest number of rainy days is July (10.7 days).
The month with the lowest number of rainy days is September (7 days).

Average daylight in September / Average sunshine in September - Jackson, MS
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10.1h).

  • Average sunshine in September: 7.8h

The month with most sunshine is June (Average sunshine: 10h).
The month with least sunshine is December (Average sunshine: 4.9h).

Average UV index in September - Jackson, MS
  • Average UV index in September: 8

Months with the highest UV index are May, June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 3).