Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The arrival of September is marked by an average high-temperature of a still tropical 87.6°F (30.9°C), bearing a close resemblance to August. In the month of September, the average low-temperature in McHenry, Mississippi, usually rests at an agreeable 69.8°F (21°C).Heat index
The heat index value for September is estimated at a fiery hot 102.2°F (39°C). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.Understand that the heat index values take into account shaded locations and mild winds. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.
Humidity
The average relative humidity in September in McHenry, Mississippi, is 76%.Rainfall
In September, the rain falls for 18.1 days. Throughout September, 2.64" (67mm) of precipitation is accumulated. Throughout the year, there are 172.1 rainfall days, and 31.46" (799mm) of precipitation is accumulated.Snowfall
February through November are months without snowfall.Daylight
In September, the average length of the day is 12h and 20min.On the first day of the month, sunrise is at 6:33 am and sunset at 7:19 pm. On the last day of September, in McHenry, sunrise is at 6:49 am and sunset at 6:42 pm CDT.
Sunshine
The average sunshine in September in McHenry is 9.4h.UV index
In September, the average daily maximum UV index in McHenry is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.Note: The average daily UV index of 6 in September transforms into the following instructions:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September in McHenry?
What is the average humidity in September in McHenry?
How much does it rain in McHenry in September?
When it does not snow in McHenry?
How many hours of daylight does McHenry have in September?
When is the sunrise / sunset in September in McHenry?
How long on average sun shines in September in McHenry?
What is the UV index intensity in September in McHenry?
Average temperature in September
McHenry, MS
- Average high temperature in September: 87.6°F
The warmest month (with the highest average high temperature) is August (91.9°F).
The month with the lowest average high temperature is January (58.1°F).
- Average low temperature in September: 69.8°F
The month with the highest average low temperature is August (74.1°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).
Average pressure in September
McHenry, MS
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are June and August (29.97"Hg).
Average wind speed in September
McHenry, MS
- Average wind speed in September: 4.6mph
The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest months (with the lowest average wind speed) are July and August (4.3mph).
Average humidity in September
McHenry, MS
- Average humidity in September: 76%
The month with the highest relative humidity is December (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
McHenry, MS
- Average rainfall in September: 2.64"
The wettest month (with the highest rainfall) is August (4.57").
The driest month (with the least rainfall) is November (1.61").
Average rainfall days in September
McHenry, MS
- Average rainfall days in September: 18.1 days
The month with the highest number of rainy days is July (24 days).
The month with the least rainy days is November (8 days).
Average snowfall in September
McHenry, MS
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.31").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
McHenry, MS
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.6 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
McHenry, MS
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 48min).
The months with the least sunshine are February and December (Average sunshine: 5h and 6min).
Average sunshine days in September
McHenry, MS
- Average sunshine days in September: 9.2 days
The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is July (5.3 days).
Average UV index in September
McHenry, MS
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
McHenry, MS
- Average cloud cover in September: 29
The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is October (Cloud cover 27).
Average visibility in September
McHenry, MS
- Average visibility in September: 5mi
The months with the highest visibility are June, July, August, October and November (6mi).
The months with the lowest visibility are January, February, March, April, May, September and December (5mi).
McHenry, Mississippi, USA
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