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
September ushers in a slight temperature change, with average high-temperatures reducing from August's moderately hot 83.3°F (28.5°C) to an agreeable 72.9°F (22.7°C). Lewisville's average nighttime temperatures present a clear contrast to its daytime highs, measured at a frosty 47.8°F (8.8°C) in September.Humidity
In September, the average relative humidity is 42%.Rainfall
In Lewisville, in September, during 7.8 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. In Lewisville, during the entire year, the rain falls for 112.3 days and collects up to 10.94" (278mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows in Lewisville. Throughout September, in the average 0.1 snowfall days, it receives 0.24" (6mm) of snow. In Lewisville, Idaho, during the entire year, snow falls for 79 days and aggregates up to 31.54" (801mm) of snow.Daylight
In Lewisville, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:52 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 7:10 pm MDT.
Sunshine
In Lewisville, the average sunshine in September is 10h.UV index
In September, the average daily maximum UV index in Lewisville is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: An average maximum UV index of 4 in September leads to these recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Around midday, solar radiation is most harmful; hence, exposure should be limited. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Frequently asked questions
What is the usual temperature for Lewisville in September?
What is the average humidity in September in Lewisville?
How much does it rain in Lewisville in September?
When does it start to snow in Lewisville?
What is the average length of the day in September in Lewisville?
When is the sunrise / sunset in September in Lewisville?
How many hours of sunshine does Lewisville have in September?
How high is the UV index in September in Lewisville?
Average temperature in September
Lewisville, ID
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is December (27.1°F).
- Average low temperature in September: 47.8°F
The month with the highest average low temperature is August (53.8°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure in September
Lewisville, ID
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Lewisville, ID
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is April (8mph).
The calmest month (with the lowest average wind speed) is January (4.9mph).
Average humidity in September
Lewisville, ID
- Average humidity in September: 42%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (37%).
Average rainfall in September
Lewisville, ID
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is May (1.26").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in September
Lewisville, ID
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is April (14.2 days).
The month with the least rainy days is July (5.8 days).
Average snowfall in September
Lewisville, ID
- Average snowfall in September: 0.24"
The month with the highest snowfall is January (8.31").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Lewisville, ID
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (17.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Lewisville, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 10h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in September
Lewisville, ID
- Average sunshine days in September: 19.8 days
The month with the most sunshine days is July (22.3 days).
The month with the least sunshine days is February (9.9 days).
Average UV index in September
Lewisville, ID
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Lewisville, ID
- Average cloud cover in September: 16
The month with the most cloud cover is February (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in September
Lewisville, ID
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
Lewisville, Idaho, USA
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