September weather forecast
South Lake Tahoe, CA

The Emerald Bay in South Lake Tahoe, California, with a side view of the mountain slope
The Emerald Bay in South Lake Tahoe, California, with a side view of the mountain slope

Weather in September

September, the first month of the autumn in South Lake Tahoe, is also an enjoyable month, with an average temperature fluctuating between 42.3°F (5.7°C) and 67.3°F (19.6°C).

Temperature

In South Lake Tahoe, the average high-temperature in September slightly decreases from an agreeable 73°F (22.8°C) in August to an enjoyable 67.3°F (19.6°C). In September, the average low-temperature is 42.3°F (5.7°C).

Humidity

The average relative humidity in September is 46%.

Rainfall

In South Lake Tahoe, California, during 4 rainfall days, 0.39" (10mm) of precipitation is typically accumulated. In South Lake Tahoe, during the entire year, the rain falls for 67.1 days and collects up to 23.39" (594mm) of precipitation.

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 is 12h and 25min.
On the first day of September, sunrise is at 6:29 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:55 am and sunset at 6:44 pm PDT.

Sunshine

The average sunshine in September in South Lake Tahoe, California, is 11.1h.

UV index

In South Lake Tahoe, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The daily maximum UV index of 3 in September interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in South Lake Tahoe?

The average high-temperature, in September, in South Lake Tahoe, is 67.3°F (19.6°C), while the average low-temperature is 42.3°F (5.7°C).

What is the average humidity in September in South Lake Tahoe?

In South Lake Tahoe, the average relative humidity in September is 46%.

How much does it rain in South Lake Tahoe in September?

In South Lake Tahoe, in September, it is raining for 4 days, with typically 0.39" (10mm) of accumulated precipitation.

When does it start snowing in South Lake Tahoe?

September is the first month it typically snows in South Lake Tahoe, California. Throughout September, in the average 0.7 snowfall days, it receives 0.35" (9mm) of snow.

What is the average length of the day in September in South Lake Tahoe?

In September, the average day length in South Lake Tahoe is 12h and 25min.

When is the sunrise / sunset in September in South Lake Tahoe?

In September, on the first day of the month, sunrise is at 6:29 am and sunset at 7:30 pm. On the last day of the month, in South Lake Tahoe, California, sunrise is at 6:55 am and sunset at 6:44 pm PDT.

How many hours of sunshine does South Lake Tahoe have in September?

In South Lake Tahoe, the average sunshine duration in September is 11.1h.

How high is the UV index in September in South Lake Tahoe?

In September, the average daily maximum UV index in South Lake Tahoe is 3. A UV Index reading of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
South Lake Tahoe, CA

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).

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Average pressure in September
South Lake Tahoe, CA

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).

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Average wind speed in September
South Lake Tahoe, CA

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).

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Average humidity in September
South Lake Tahoe, CA

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%).

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Average rainfall in September
South Lake Tahoe, CA

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").

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Average rainfall days in September
South Lake Tahoe, CA

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).

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Average snowfall in September
South Lake Tahoe, CA

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").

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Average snowfall days in September
South Lake Tahoe, CA

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).

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Average daylight in September /
Average sunshine in September
South Lake Tahoe, CA

Average daylight in September / Average sunshine in September - South Lake Tahoe, CA
  • Average daylight in September: 12h and 25min

The month with the longest days is June (Average daylight: 14h and 52min).
The month with the shortest days is December (Average daylight: 9h and 29min).

  • 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).

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Average sunshine days in September
South Lake Tahoe, CA

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).

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Average UV index in September
South Lake Tahoe, CA

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).

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Average cloud cover in September
South Lake Tahoe, CA

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).

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Average visibility in September
South Lake Tahoe, CA

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).

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