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
Walnut Creek in September experiences a gentle temperature dip, with average high-temperatures reducing from a tropical 86.9°F (30.5°C) in August to a moderately hot 81.5°F (27.5°C). Walnut Creek throughout September, experiences an average nighttime temperature of 65.3°F (18.5°C).Heat index
The heat index value during September is estimated at a tropical 87.8°F (31°C). Staying active during long-term exposure might result in a state of exhaustion and cause heat cramps.For clarity, heat index numbers account for light winds and areas under shade. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', arises from combining readings of air temperature and relative moisture content. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
Humidity
August and September, with an average relative humidity of 79%, are the most humid months.Rainfall
In Walnut Creek, in September, during 9 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, there are 110.7 rainfall days, and 9.02" (229mm) of precipitation is accumulated.Snowfall
In Walnut Creek, snow does not fall in March through December.Daylight
In Walnut Creek, the average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:44 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:56 pm EDT.
Sunshine
In Walnut Creek, the average sunshine in September is 9.1h.UV index
In Walnut Creek, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 5 translates into these guidelines:
Guard yourself - Avoiding sunburn is suggested. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What are the most humid months in Walnut Creek?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
How many hours of daylight does Walnut Creek have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Walnut Creek have in September?
How high is the UV index in September?
Average temperature in September
Walnut Creek, NC
- Average high temperature in September: 81.5°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (49.6°F).
- Average low temperature in September: 65.3°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 (34.5°F).
Average pressure in September
Walnut Creek, NC
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in September
Walnut Creek, NC
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in September
Walnut Creek, NC
- Average humidity in September: 79%
The months with the highest relative humidity are August and September (79%).
The month with the lowest relative humidity is January (73%).
Average rainfall in September
Walnut Creek, NC
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is August (1.42").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days in September
Walnut Creek, NC
- Average rainfall days in September: 9 days
The month with the highest number of rainy days is August (15 days).
The month with the least rainy days is November (5.8 days).
Average snowfall in September
Walnut Creek, NC
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.08").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Walnut Creek, NC
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Walnut Creek, NC
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 9h and 1min
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 30min).
Average sunshine days in September
Walnut Creek, NC
- Average sunshine days in September: 18 days
The month with the most sunshine days is October (23.5 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in September
Walnut Creek, NC
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in September
Walnut Creek, NC
- Average cloud cover in September: 36
The months with the most cloud cover are February and March (Cloud cover 41).
The months with the least cloud cover are June, July and October (Cloud cover 32).
Average visibility in September
Walnut Creek, NC
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Walnut Creek, North Carolina, USA
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