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 beginning of September brings a slight decrease in the average high-temperature, transitioning from a fiery hot 95.9°F (35.5°C) in August to a tropical 87.4°F (30.8°C). An average nighttime temperature of 70.2°F (21.2°C) is recorded during September.Humidity
In September, the average relative humidity is 24%.Rainfall
In Las Vegas, during September, the rain falls for 5.3 days and regularly aggregates up to 0.51" (13mm) of precipitation. Throughout the year, there are 57.5 rainfall days, and 6.02" (153mm) of precipitation is accumulated.Snowfall
In Las Vegas, snow does not fall in March through November.Daylight
The average length of the day in September is 12h and 23min.On the first day of September, sunrise is at 6:12 am and sunset at 7:07 pm. On the last day of the month, sunrise is at 6:35 am and sunset at 6:25 pm PDT.
Sunshine
In September, the average sunshine is 10.3h.UV index
In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for average individuals.Note: The average daily UV index of 6 in September transforms into the following instructions:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it 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 long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Las Vegas, NV
- Average high temperature in September: 87.4°F
The warmest month (with the highest average high temperature) is July (97.3°F).
The month with the lowest average high temperature is December (50°F).
- Average low temperature in September: 70.2°F
The month with the highest average low temperature is July (77.7°F).
The coldest month (with the lowest average low temperature) is December (37.9°F).
Average pressure in September
Las Vegas, NV
- Average pressure in September: 29.85"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.76"Hg).
Average wind speed in September
Las Vegas, NV
- Average wind speed in September: 6.4mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is January (5.5mph).
Average humidity in September
Las Vegas, NV
- Average humidity in September: 24%
The month with the highest relative humidity is January (48%).
The month with the lowest relative humidity is June (15%).
Average rainfall in September
Las Vegas, NV
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is July (0.87").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in September
Las Vegas, NV
- Average rainfall days in September: 5.3 days
The month with the highest number of rainy days is July (8.3 days).
The month with the least rainy days is June (1.4 days).
Average snowfall in September
Las Vegas, NV
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.16").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Las Vegas, NV
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (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
Las Vegas, NV
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 6min).
Average sunshine days in September
Las Vegas, NV
- Average sunshine days in September: 22 days
The month with the most sunshine days is June (27.3 days).
The month with the least sunshine days is July (18.1 days).
Average UV index in September
Las Vegas, NV
- Average UV index in September: 6
The months with the highest UV index are June and July (UV index 8).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Las Vegas, NV
- Average cloud cover in September: 7
The month with the most cloud cover is December (Cloud cover 20).
The months with the least cloud cover are June and August (Cloud cover 6).
Average visibility in September
Las Vegas, NV
- 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).
Las Vegas, Nevada, USA
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