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
Norristown's weather in September, with an average high-temperature of a moderately hot 84.9°F (29.4°C), subtly shifts from August's 90°F (32.2°C). Norristown records a mean low-temperature of 68.2°F (20.1°C) in September.Heat index
September's mean heat index is calculated to be a sweltering 95°F (35°C). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.Heat index evaluations are typically in the context of light winds and shaded environments. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
Perspiring is a crucial mechanism for the human body, allowing it to release excessive warmth through evaporating sweat. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.
Humidity
In September, the average relative humidity is 75%.Rainfall
In Norristown, in September, it is raining for 12.5 days, with typically 1.02" (26mm) of accumulated precipitation. Throughout the year, in Norristown, there are 136.8 rainfall days, and 17.05" (433mm) of precipitation is accumulated.Snowfall
In Norristown, snow does not fall in March through December.Daylight
The average length of the day in September is 12h and 22min.On the first day of the month, sunrise is at 7:05 am and sunset at 7:54 pm. On the last day of September, sunrise is at 7:23 am and sunset at 7:15 pm EDT.
Sunshine
In Norristown, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: A daily high UV index of 6 in September leads to these guidelines:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in Norristown in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Norristown have in September?
What is the UV index intensity in September?
Average temperature in September
Norristown, GA
- Average high temperature in September: 84.9°F
The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (55.9°F).
- Average low temperature in September: 68.2°F
The month with the highest average low temperature is July (73.4°F).
The coldest month (with the lowest average low temperature) is January (39.6°F).
Average pressure in September
Norristown, GA
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are June and August (29.98"Hg).
Average wind speed in September
Norristown, GA
- Average wind speed in September: 6.2mph
The windiest months (with the highest average wind speed) are February and March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).
Average humidity in September
Norristown, GA
- Average humidity in September: 75%
The months with the highest relative humidity are August and December (76%).
The months with the lowest relative humidity are January and November (71%).
Average rainfall in September
Norristown, GA
- Average rainfall in September: 1.02"
The wettest month (with the highest rainfall) is August (2.09").
The driest month (with the least rainfall) is November (0.94").
Average rainfall days in September
Norristown, GA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is November (6.6 days).
Average snowfall in September
Norristown, GA
- Average snowfall in September: 0"
The months with the highest snowfall are January and February (0.04").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Norristown, GA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Norristown, GA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in September
Norristown, GA
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is November (21.8 days).
The month with the least sunshine days is July (10.4 days).
Average UV index in September
Norristown, GA
- 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
Norristown, GA
- Average cloud cover in September: 31
The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 27).
Average visibility in September
Norristown, GA
- 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).
Norristown, Georgia, USA
Weather forecast for your location
2. Allow the app to use your location