September weather forecast
Palomar Mountain, CA

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Weather in September

September, the first month of the autumn in Palomar Mountain, is still a warm month, with an average temperature ranging between max 84.4°F (29.1°C) and min 61.7°F (16.5°C).

Temperature

September begins with an average high-temperature of a moderately hot 84.4°F (29.1°C), reflecting close similarity to the preceding month. Palomar Mountain observes a noteworthy temperature drop from the daily highs during September nights, with a mean temperature of 61.7°F (16.5°C).

Heat index

For most parts of September, the heat index is computed to be a hot 87.8°F (31°C). If exposure and ongoing activity persist, they might induce a state of tiredness and heat cramps.
Consider that heat index readings are for situations in the shade and light wind. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.

Humidity

In September, the average relative humidity in Palomar Mountain, California, is 56%.

Rainfall

In September, in Palomar Mountain, the rain falls for 3.9 days. Throughout September, 0.24" (6mm) of precipitation is accumulated. In Palomar Mountain, during the entire year, the rain falls for 51.6 days and collects up to 5.59" (142mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In September, the average length of the day is 12h and 22min.
On the first day of the month, sunrise is at 6:22 am and sunset at 7:12 pm. On the last day of September, in Palomar Mountain, California, sunrise is at 6:41 am and sunset at 6:32 pm PDT.

Sunshine

The average sunshine in September is 10.5h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index in Palomar Mountain. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum high UV index of 6 in September translates into the following recommendations:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
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Frequently asked questions

How hot does it get in Palomar Mountain in September?

In September, in Palomar Mountain, the average high-temperature is 84.4°F (29.1°C), and the average low-temperature is 61.7°F (16.5°C). In September, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines relative humidity and air temperature, is computed to be 87.8°F (31°C).

What is the average humidity in September in Palomar Mountain?

In September, the average relative humidity in Palomar Mountain, California, is 56%.

How many days does it rain in September in Palomar Mountain?

In Palomar Mountain, California, in September, during 3.9 rainfall days, 0.24" (6mm) of precipitation is typically accumulated.

When it does not snow in Palomar Mountain?

June through September are months without snowfall in Palomar Mountain.

Does it snow in Palomar Mountain in September?

In Palomar Mountain, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Palomar Mountain?

The average day length in September in Palomar Mountain, California, is 12h and 22min.

What time are sunrise and sunset in September in Palomar Mountain?

On the first day of September in Palomar Mountain, California, sunrise is at 6:22 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:32 pm PDT.

How long on average sun shines in September in Palomar Mountain?

In Palomar Mountain, the average sunshine duration in September is 10.5h.

What is the month with the highest UV index in Palomar Mountain?

The months with the highest UV index in Palomar Mountain, California, are June through September, with an average maximum UV index of 6.

What is the UV index reading in September in Palomar Mountain?

The average daily maximum UV index in September in Palomar Mountain, California, is 6. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's 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
Palomar Mountain, CA

Average temperature in September - Palomar Mountain, CA
  • Average high temperature in September: 84.4°F

The warmest month (with the highest average high temperature) is August (86.9°F).
The month with the lowest average high temperature is December (62.4°F).

  • Average low temperature in September: 61.7°F

The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is February (44.6°F).

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Average pressure in September
Palomar Mountain, CA

Average pressure in September - Palomar Mountain, CA
  • Average pressure in September: 29.87"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in September
Palomar Mountain, CA

Average wind speed in September - Palomar Mountain, CA
  • Average wind speed in September: 4.2mph

The windiest month (with the highest average wind speed) is April (5.3mph).
The calmest month (with the lowest average wind speed) is September (4.2mph).

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Average humidity in September
Palomar Mountain, CA

Average humidity in September - Palomar Mountain, CA
  • Average humidity in September: 56%

The month with the highest relative humidity is May (66%).
The month with the lowest relative humidity is November (52%).

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Average rainfall in September
Palomar Mountain, CA

Average rainfall in September - Palomar Mountain, CA
  • Average rainfall in September: 0.24"

The wettest month (with the highest rainfall) is February (0.94").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Palomar Mountain, CA

Average rainfall days in September - Palomar Mountain, CA
  • Average rainfall days in September: 3.9 days

The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (1.3 days).

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Average snowfall in September
Palomar Mountain, CA

Average snowfall in September - Palomar Mountain, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (9.4").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Palomar Mountain, CA

Average snowfall days in September - Palomar Mountain, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in September /
Average sunshine in September
Palomar Mountain, CA

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

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in September: 10h and 3min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

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Average sunshine days in September
Palomar Mountain, CA

Average sunshine days in September - Palomar Mountain, CA
  • Average sunshine days in September: 24.8 days

The month with the most sunshine days is June (28.1 days).
The month with the least sunshine days is February (21.5 days).

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Average UV index in September
Palomar Mountain, CA

Average UV index in September - Palomar Mountain, CA
  • Average UV index in September: 6

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

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Average cloud cover in September
Palomar Mountain, CA

Average cloud cover in September - Palomar Mountain, CA
  • Average cloud cover in September: 9

The month with the most cloud cover is March (Cloud cover 25).
The month with the least cloud cover is August (Cloud cover 6).

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Average visibility in September
Palomar Mountain, CA

Average visibility in September - Palomar Mountain, 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).

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Palomar Mountain, California, USA

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