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
With the beginning of September, the average high-temperature shows a small decrease, transitioning from a tropical 89.1°F (31.7°C) in August to a warm 81°F (27.2°C). September nights experience a consistent temperature drop to a refreshing 59.7°F (15.4°C).Heat index
The heat index in September is calculated to be 82.4°F (28°C). Fatigue might occur with continuous exposure and activity, potentially causing heat cramps.Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', integrates the air's temperature and its humidity to showcase the felt temperature by people. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Humidity
The average relative humidity in September in Herndon is 54%.Rainfall
In Herndon, Kansas, in September, it is raining for 10.4 days, with typically 1.06" (27mm) of accumulated precipitation. Throughout the year, there are 105.3 rainfall days, and 15.79" (401mm) of precipitation is accumulated.Snowfall
In Herndon, Kansas, snow does not fall in June through September.Daylight
The average length of the day in September in Herndon is 12h and 26min.On the first day of the month, sunrise is at 7:11 am and sunset at 8:14 pm. On the last day of September, in Herndon, sunrise is at 7:39 am and sunset at 7:26 pm CDT.
Sunshine
The average sunshine in September is 9h.UV index
The average daily maximum UV index in September in Herndon is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a regular UV index of 5 translates into these guidelines:
Exercise care. People with light skin might get burns in fewer than 30 minutes. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
What are September temperatures in Herndon?
What is the average humidity in September in Herndon?
How much does it rain in Herndon in September?
When it does not snow in Herndon?
Does it snow in Herndon in September?
How many hours of daylight does Herndon have in September?
What time are sunrise and sunset in September in Herndon?
How many hours of sunshine does Herndon have in September?
What is the UV index reading in September in Herndon?
Average temperature in September
Herndon, KS
- Average high temperature in September: 81°F
The warmest month (with the highest average high temperature) is July (91.9°F).
The month with the lowest average high temperature is December (40.1°F).
- Average low temperature in September: 59.7°F
The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in September
Herndon, KS
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.82"Hg).
Average wind speed in September
Herndon, KS
- Average wind speed in September: 10.7mph
The windiest month (with the highest average wind speed) is April (12.4mph).
The calmest month (with the lowest average wind speed) is August (9.8mph).
Average humidity in September
Herndon, KS
- Average humidity in September: 54%
The month with the highest relative humidity is January (67%).
The month with the lowest relative humidity is July (52%).
Average rainfall in September
Herndon, KS
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is May (2.6").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Herndon, KS
- Average rainfall days in September: 10.4 days
The month with the highest number of rainy days is May (14.7 days).
The month with the least rainy days is February (2.6 days).
Average snowfall in September
Herndon, KS
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.17").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Herndon, KS
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (6.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Herndon, KS
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The months with the least sunshine are January and December (Average sunshine: 6h and 18min).
Average sunshine days in September
Herndon, KS
- Average sunshine days in September: 16.9 days
The month with the most sunshine days is November (23.9 days).
The month with the least sunshine days is August (12.9 days).
Average UV index in September
Herndon, KS
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Herndon, KS
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 35).
The months with the least cloud cover are June and July (Cloud cover 20).
Average visibility in September
Herndon, KS
- 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).
Herndon, Kansas, USA
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