September weather forecast
Lake Arrowhead, CA

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Weather in September

September, the first month of the autumn in Lake Arrowhead, is still a warm month, with an average temperature fluctuating between 61.9°F (16.6°C) and 84°F (28.9°C).

Temperature

During September, the average high-temperature is a warm 84°F (28.9°C), maintaining a close resemblance to that of the preceding month. Lake Arrowhead logs a notable disparity from the daily highs during September, as the nighttime temperature lowers to an average of 61.9°F (16.6°C).

Humidity

The average relative humidity in September is 37%.

Rainfall

In September, the rain falls for 2.3 days. Throughout September, 0.12" (3mm) of precipitation is accumulated. Throughout the year, there are 42.2 rainfall days, and 5.55" (141mm) of precipitation is accumulated.

Snowfall

June through October are months without snowfall.

Daylight

In Lake Arrowhead, the average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:22 am and sunset at 7:14 pm. On the last day of September, sunrise is at 6:43 am and sunset at 6:33 pm PDT.

Sunshine

In Lake Arrowhead, the average sunshine in September is 10.6h.

UV index

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The UV index of 6 during September leads to these advisories:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.

Frequently asked questions

How hot is it in September?

In Lake Arrowhead, 84°F (28.9°C) is the average high-temperature and 61.9°F (16.6°C) is the average low-temperature during September.

What is the average humidity in September?

The average relative humidity in September is 37%.

How many days does it rain in September in Lake Arrowhead?

In Lake Arrowhead, in September, it is raining for 2.3 days, with typically 0.12" (3mm) of accumulated precipitation.

When it does not snow?

In Lake Arrowhead, snow does not fall in June through October.

What is the average length of the day in September?

In Lake Arrowhead, the average day length in September is 12h and 22min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:22 am and sunset at 7:14 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:33 pm PDT.

How many hours of sunshine does Lake Arrowhead have in September?

In September, the average sunshine duration is 10.6h.

How high is the UV index in September?

In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Lake Arrowhead, CA

Average temperature in September - Lake Arrowhead, CA
  • Average high temperature in September: 84°F

The warmest months (with the highest average high temperature) are July and August (88.3°F).
The month with the lowest average high temperature is December (53.4°F).

  • Average low temperature in September: 61.9°F

The month with the highest average low temperature is August (66.4°F).
The coldest month (with the lowest average low temperature) is December (38.3°F).

Average pressure in September
Lake Arrowhead, CA

Average pressure in September - Lake Arrowhead, CA
  • Average pressure in September: 29.86"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).

Average wind speed in September
Lake Arrowhead, CA

Average wind speed in September - Lake Arrowhead, CA
  • Average wind speed in September: 5.3mph

The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is September (5.3mph).

Average humidity in September
Lake Arrowhead, CA

Average humidity in September - Lake Arrowhead, CA
  • Average humidity in September: 37%

The months with the highest relative humidity are February and December (52%).
The month with the lowest relative humidity is August (32%).

Average rainfall in September
Lake Arrowhead, CA

Average rainfall in September - Lake Arrowhead, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is February (1.1").
The driest month (with the least rainfall) is June (0.08").

Average rainfall days in September
Lake Arrowhead, CA

Average rainfall days in September - Lake Arrowhead, CA
  • Average rainfall days in September: 2.3 days

The month with the highest number of rainy days is March (5.7 days).
The month with the least rainy days is June (1.2 days).

Average snowfall in September
Lake Arrowhead, CA

Average snowfall in September - Lake Arrowhead, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is April (4.09").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in September
Lake Arrowhead, CA

Average snowfall days in September - Lake Arrowhead, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Lake Arrowhead, CA

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

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 10h and 4min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).

Average sunshine days in September
Lake Arrowhead, CA

Average sunshine days in September - Lake Arrowhead, CA
  • Average sunshine days in September: 26 days

The month with the most sunshine days is June (27.9 days).
The month with the least sunshine days is February (21.8 days).

Average UV index in September
Lake Arrowhead, CA

Average UV index in September - Lake Arrowhead, CA
  • Average UV index in September: 6

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).

Average cloud cover in September
Lake Arrowhead, CA

Average cloud cover in September - Lake Arrowhead, CA
  • Average cloud cover in September: 6

The month with the most cloud cover is December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).

Average visibility in September
Lake Arrowhead, CA

Average visibility in September - Lake Arrowhead, 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).

Lake Arrowhead, California, USA

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