September weather forecast
Twin Bridges, CA

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Weather in September

September, the first month of the autumn in Twin Bridges, is still a comfortable month, with temperature in the range of an average high of 67.3°F (19.6°C) and an average low of 42.3°F (5.7°C).

Temperature

As September arrives, Twin Bridges's weather displays a minor decrease in high-temperatures, transitioning from August's agreeable 73.2°F (22.9°C) to a refreshing 67.3°F (19.6°C). September presents a pronounced divergence from daily peak temperatures, with the average low-temperature of 42.3°F (5.7°C).

Humidity

In Twin Bridges, the average relative humidity in September is 45%.

Rainfall

In Twin Bridges, during September, the rain falls for 4.3 days and regularly aggregates up to 0.39" (10mm) of precipitation. In Twin Bridges, during the entire year, the rain falls for 45.4 days and collects up to 26.06" (662mm) of precipitation.

Snowfall

Months with snowfall in Twin Bridges are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 1 snowfall days, it receives 0.63" (16mm) of snow. In Twin Bridges, California, during the entire year, snow falls for 83.9 days and aggregates up to 153.46" (3898mm) of snow.

Daylight

The average length of the day in September in Twin Bridges is 12h and 25min.
On the first day of the month, sunrise is at 6:30 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:56 am and sunset at 6:44 pm PDT.

Sunshine

The average sunshine in September in Twin Bridges is 11.1h.

UV index

In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 3 in September interprets into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.

Frequently asked questions

What is the temperature in September in Twin Bridges?

The high-temperature in Twin Bridges during September is 67.3°F (19.6°C) and the low-temperature is 42.3°F (5.7°C).

What is the average humidity in September in Twin Bridges?

In September, the average relative humidity in Twin Bridges is 45%.

How many days does it rain in September in Twin Bridges?

In Twin Bridges, in September, during 4.3 rainfall days, 0.39" (10mm) of precipitation is typically accumulated.

When does it start to snow in Twin Bridges?

September is the first month it typically snows in Twin Bridges, California. Throughout September, in the average 1 snowfall days, it receives 0.63" (16mm) of snow.

How many hours of daylight does Twin Bridges have in September?

In September, the average day length in Twin Bridges is 12h and 25min.

When are sunrise and sunset in September in Twin Bridges?

On the first day of September in Twin Bridges, California, sunrise is at 6:30 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:44 pm PDT.

How long on average sun shines in September in Twin Bridges?

In September, the average sunshine duration is 11.1h.

What is the UV index intensity in September in Twin Bridges?

The average daily maximum UV index in September in Twin Bridges is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Twin Bridges, CA

Average temperature in September - Twin Bridges, CA
  • Average high temperature in September: 67.3°F

The warmest month (with the highest average high temperature) is July (74.1°F).
The month with the lowest average high temperature is December (35.4°F).

  • Average low temperature in September: 42.3°F

The month with the highest average low temperature is July (47.1°F).
The coldest month (with the lowest average low temperature) is December (20.1°F).

Average pressure in September
Twin Bridges, CA

Average pressure in September - Twin Bridges, CA
  • Average pressure in September: 29.94"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in September
Twin Bridges, CA

Average wind speed in September - Twin Bridges, CA
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is March (7.5mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in September
Twin Bridges, CA

Average humidity in September - Twin Bridges, CA
  • Average humidity in September: 45%

The month with the highest relative humidity is March (82%).
The month with the lowest relative humidity is August (41%).

Average rainfall in September
Twin Bridges, CA

Average rainfall in September - Twin Bridges, CA
  • Average rainfall in September: 0.39"

The wettest month (with the highest rainfall) is March (4.69").
The driest month (with the least rainfall) is August (0.31").

Average rainfall days in September
Twin Bridges, CA

Average rainfall days in September - Twin Bridges, CA
  • Average rainfall days in September: 4.3 days

The month with the highest number of rainy days is May (6.9 days).
The month with the least rainy days is November (1.3 days).

Average snowfall in September
Twin Bridges, CA

Average snowfall in September - Twin Bridges, CA
  • Average snowfall in September: 0.63"

The month with the highest snowfall is March (33.46").
The months with the least snowfall are July and August (0").

Average snowfall days in September
Twin Bridges, CA

Average snowfall days in September - Twin Bridges, CA
  • Average snowfall days in September: 1 days

The month with the highest number of snowfall days is March (15.2 days).
The months with the least snowfall days are July and August (0 days).

Average daylight in September /
Average sunshine in September
Twin Bridges, CA

Average daylight in September / Average sunshine in September - Twin Bridges, CA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 11h and 1min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

Average sunshine days in September
Twin Bridges, CA

Average sunshine days in September - Twin Bridges, CA
  • Average sunshine days in September: 25.2 days

The month with the most sunshine days is August (25.6 days).
The month with the least sunshine days is March (14.7 days).

Average UV index in September
Twin Bridges, CA

Average UV index in September - Twin Bridges, CA
  • Average UV index in September: 3

The months with the highest UV index are June, July and August (UV index 5).
The month with the lowest UV index is February (UV index 1).

Average cloud cover in September
Twin Bridges, CA

Average cloud cover in September - Twin Bridges, CA
  • Average cloud cover in September: 10

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 8).

Average visibility in September
Twin Bridges, CA

Average visibility in September - Twin Bridges, CA
  • Average visibility in September: 6mi

The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, April and December (5mi).

Twin Bridges, California, USA

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