September weather forecastSouth Lake Tahoe, CA
September
Weather in September
September marks the commencement of the beautiful fall season in South Lake Tahoe. The barely noticeable snowfall of 0.35" (9mm) is a reflection of the hold summer still exercises over this month. September weather conditions bring about a shift from the peak summer temperatures to slightly cooler days. It’s the perfect month to enjoy the fall foliage and crisp air during your mountain hikes without the stifling summer heat. By the end of September, South Lake Tahoe begins to prepare for the winter chill once more.Temperature
A mild drop in South Lake Tahoe's average high-temperature is observed in September, transitioning from a pleasant 73°F (22.8°C) in August to a refreshing 67.3°F (19.6°C). South Lake Tahoe experiences a significant reduction from daytime highs with an average low-temperature of 42.3°F (5.7°C) in September.Humidity
In South Lake Tahoe, the average relative humidity in September is 46%.Rainfall
In South Lake Tahoe, in September, during 4 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. Throughout the year, in South Lake Tahoe, there are 67.1 rainfall days, and 23.39" (594mm) of precipitation is accumulated.Snowfall
Months with snowfall in South Lake Tahoe are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 0.35" (9mm) of snow. In South Lake Tahoe, during the entire year, snow falls for 76 days and aggregates up to 113.98" (2895mm) of snow.Daylight
The average length of the day in September in South Lake Tahoe, California, is 12h and 25min.On the first day of September, sunrise is at 6:29 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:43 pm PDT.
Sunshine
In September, the average sunshine in South Lake Tahoe is 11.1h.UV index
In September, the average daily maximum UV index in South Lake Tahoe is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 3 during September translates into the following directions:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
South Lake Tahoe, CA
- Average high temperature in September: 67.3°F
The warmest month (with the highest average high temperature) is July (73.9°F).
The month with the lowest average high temperature is December (35.8°F).
- Average low temperature in September: 42.3°F
The month with the highest average low temperature is July (46.8°F).
The coldest month (with the lowest average low temperature) is December (21°F).
Average pressure in September
South Lake Tahoe, CA
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
South Lake Tahoe, CA
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is March (7.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in September
South Lake Tahoe, CA
- Average humidity in September: 46%
The month with the highest relative humidity is March (81%).
The month with the lowest relative humidity is August (42%).
Average rainfall in September
South Lake Tahoe, CA
- Average rainfall in September: 0.39"
The wettest month (with the highest rainfall) is March (4.25").
The driest month (with the least rainfall) is August (0.28").
Average rainfall days in September
South Lake Tahoe, CA
- Average rainfall days in September: 4 days
The month with the highest number of rainy days is May (10 days).
The month with the least rainy days is February (3.5 days).
Average snowfall in September
South Lake Tahoe, CA
- Average snowfall in September: 0.35"
The month with the highest snowfall is March (27.24").
The months with the least snowfall are July and August (0").
Average snowfall days in September
South Lake Tahoe, CA
- Average snowfall days in September: 0.7 days
The month with the highest number of snowfall days is March (15 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
South Lake Tahoe, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 11h and 6min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).
Average sunshine days in September
South Lake Tahoe, CA
- Average sunshine days in September: 24.7 days
The month with the most sunshine days is August (25.6 days).
The month with the least sunshine days is March (13.3 days).
Average UV index in September
South Lake Tahoe, CA
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, April, November and December (UV index 2).
Average cloud cover in September
South Lake Tahoe, CA
- Average cloud cover in September: 10
The month with the most cloud cover is March (Cloud cover 43).
The months with the least cloud cover are July and August (Cloud cover 8).
Average visibility in September
South Lake Tahoe, CA
- 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, March and December (5mi).
