September weather forecast
Interlaken, CA

Share

Weather in September

September, the first month of the autumn in Interlaken, is still a warm month, with an average temperature varying between 54.5°F (12.5°C) and 78.3°F (25.7°C).

Temperature

The average high-temperature in September, at a still moderately hot 78.3°F (25.7°C), reveals a modest deviation from August's 78.6°F (25.9°C). Interlaken sees a consistent average low-temperature of 54.5°F (12.5°C) in September, indicating a substantial decrease from the day's temperature.

Humidity

The months with the lowest humidity are September and October, with an average relative humidity of 64%.

Rainfall

In Interlaken, in September, it is raining for 2.5 days, with typically 0.08" (2mm) of accumulated precipitation. In Interlaken, during the entire year, the rain falls for 67.1 days and collects up to 10.83" (275mm) of precipitation.

Daylight

The average length of the day in September is 12h and 24min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:34 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:51 pm PDT.

Sunshine

In Interlaken, the average sunshine in September is 11.2h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum UV index of 5 in September translates into the following recommendations:
Put precautions into practice - Guidance to elude sunburn is provided. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
[Resources]

Frequently asked questions

What is the average September temperature in Interlaken?

In Interlaken, in September, the average high-temperature is 78.3°F (25.7°C), and the average low-temperature is 54.5°F (12.5°C).

What are the least humid months in Interlaken?

The months with the lowest humidity in Interlaken are September and October, with an average relative humidity of 64%.

What is the average humidity in September in Interlaken?

In Interlaken, California, the average relative humidity in September is 64%.

How many days does it rain in September in Interlaken?

In Interlaken, in September, it is raining for 2.5 days, with typically 0.08" (2mm) of accumulated precipitation.

How many hours of daylight does Interlaken have in September?

In September, the average day length in Interlaken, California, is 12h and 24min.

When are sunrise and sunset in September in Interlaken?

On the first day of September in Interlaken, California, sunrise is at 6:38 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:51 pm PDT.

How long on average sun shines in September in Interlaken?

In Interlaken, the average sunshine duration in September is 11.2h.

What is the UV index reading in September in Interlaken?

In September, the average daily maximum UV index in Interlaken is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Interlaken, CA

Average temperature in September - Interlaken, CA
  • Average high temperature in September: 78.3°F

The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (57.9°F).

  • Average low temperature in September: 54.5°F

The month with the highest average low temperature is September (54.5°F).
The coldest months (with the lowest average low temperature) are February and March (43.2°F).

[Resources]

Average pressure in September
Interlaken, CA

Average pressure in September - Interlaken, CA
  • Average pressure in September: 29.92"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).

[Resources]

Average wind speed in September
Interlaken, CA

Average wind speed in September - Interlaken, CA
  • Average wind speed in September: 4.6mph

The windiest month (with the highest average wind speed) is May (5.9mph).
The calmest months (with the lowest average wind speed) are October and November (4.5mph).

[Resources]

Average humidity in September
Interlaken, CA

Average humidity in September - Interlaken, CA
  • Average humidity in September: 64%

The month with the highest relative humidity is March (75%).
The months with the lowest relative humidity are September and October (64%).

[Resources]

Average rainfall in September
Interlaken, CA

Average rainfall in September - Interlaken, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is February (2.09").
The driest months (with the least rainfall) are July and August (0.04").

[Resources]

Average rainfall days in September
Interlaken, CA

Average rainfall days in September - Interlaken, CA
  • Average rainfall days in September: 2.5 days

The month with the highest number of rainy days is March (11.9 days).
The month with the least rainy days is August (0.8 days).

[Resources]

Average daylight in September /
Average sunshine in September
Interlaken, CA

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

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in September: 11h and 1min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

[Resources]

Average sunshine days in September
Interlaken, CA

Average sunshine days in September - Interlaken, CA
  • Average sunshine days in September: 26.5 days

The month with the most sunshine days is August (28.9 days).
The month with the least sunshine days is March (17.8 days).

[Resources]

Average UV index in September
Interlaken, CA

Average UV index in September - Interlaken, CA
  • Average UV index in September: 5

The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are February, November and December (UV index 3).

[Resources]

Average cloud cover in September
Interlaken, CA

Average cloud cover in September - Interlaken, CA
  • Average cloud cover in September: 10

The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 9).

[Resources]

Average visibility in September
Interlaken, CA

Average visibility in September - Interlaken, CA
  • 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).

[Resources]

Interlaken, California, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location