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 shift into September uncovers an average high-temperature of a still hot 87.8°F (31°C), subtly different from the previous month. Helena's nighttime temperature during September is consistently averaged at an agreeable 68°F (20°C).Heat index
The heat index value during September is calculated to be a fiery hot 102.2°F (39°C). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.Understanding the heat index involves considering values for shaded locales with light wind. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', arises from combining readings of air temperature and relative moisture content. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for 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.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.
Humidity
In Helena, the average relative humidity in September is 74%.Rainfall
In Helena, during September, the rain falls for 12.7 days and regularly aggregates up to 2.2" (56mm) of precipitation. Throughout the year, there are 154.1 rainfall days, and 35.12" (892mm) of precipitation is accumulated.Snowfall
In Helena, snow does not fall in April through December.Daylight
In September, the average length of the day is 12h and 21min.On the first day of September, sunrise is at 6:41 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:51 pm CDT.
Sunshine
The average sunshine in September is 9.7h.UV index
In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for average individuals.Note: The UV index of 6 during September leads to these advisories:
Stay clear of intense sun exposure. Solar protection is of utmost significance. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
How hot is it in Helena in September?
What is the average humidity in September in Helena?
How many days does it rain in September in Helena?
When it does not snow in Helena?
How many hours of daylight does Helena have in September?
What time are sunrise and sunset in September in Helena?
How long on average sun shines in September in Helena?
What is the UV index intensity in September in Helena?
Average temperature in September
Helena, LA
- Average high temperature in September: 87.8°F
The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is January (55°F).
- Average low temperature in September: 68°F
The month with the highest average low temperature is August (73°F).
The coldest month (with the lowest average low temperature) is January (40.3°F).
Average pressure in September
Helena, LA
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Helena, LA
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is February (8.3mph).
The calmest months (with the lowest average wind speed) are July and September (5.3mph).
Average humidity in September
Helena, LA
- Average humidity in September: 74%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is October (69%).
Average rainfall in September
Helena, LA
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is April (3.43").
The driest month (with the least rainfall) is November (2.13").
Average rainfall days in September
Helena, LA
- Average rainfall days in September: 12.7 days
The month with the highest number of rainy days is August (15.5 days).
The month with the least rainy days is October (8.5 days).
Average snowfall in September
Helena, LA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.55").
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Helena, LA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Helena, LA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days in September
Helena, LA
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is October (21.4 days).
The month with the least sunshine days is February (13.3 days).
Average UV index in September
Helena, LA
- Average UV index in September: 6
The months with the highest UV index are 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
Helena, LA
- Average cloud cover in September: 30
The month with the most cloud cover is February (Cloud cover 48).
The months with the least cloud cover are June and October (Cloud cover 28).
Average visibility in September
Helena, LA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Helena, Louisiana, USA
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