September weather forecast and climate
Palomar Mountain, CA

Weather in September

The first month of the autumn, September, is also a moderately hot month in Palomar Mountain, California, with temperature in the range of an average high of 84.4°F (29.1°C) and an average low of 61.7°F (16.5°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a warm 84.4°F (29.1°C). In September, in Palomar Mountain, the average low-temperature is 61.7°F (16.5°C).

Heat index

The average heat index is evaluated at a tropical 87.1°F (30.6°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, differences in body mass, height, and shape, metabolic differences). Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

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

Rainfall

In Palomar Mountain, during 3.9 rainfall days, 0.24" (6mm) of precipitation is typically 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

In Palomar Mountain snow does not fall in June through September.

Daylight

In Palomar Mountain, the average length of the day is 12.4h.

Sunshine

In September, the average sunshine 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 estimate of 6 to 7 represents a high threat to health from unsafe exposure to the UV radiation for the ordinary person.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Palomar Mountain?

In Palomar Mountain, California, in September, the average high-temperature is 84.4°F (29.1°C), and the average low-temperature is 61.7°F (16.5°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), that combines both air temperature and relative humidity, in September is estimated at 87.1°F (30.6°C).

What is the average humidity in September in Palomar Mountain?

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

How much does it rain in Palomar Mountain in September?

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

Does it snow in Palomar Mountain in September?

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

When it does not snow in Palomar Mountain?

In Palomar Mountain, California, snow does not fall in June through September.

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

In Palomar Mountain, California, the average length of the day in September is 12.4h.

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

The average sunshine in September in Palomar Mountain is 10.5h.

When is the highest UV index in Palomar Mountain?

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

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

In September, the average daily maximum UV index in Palomar Mountain is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to the UV radiation.

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"

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

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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").
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).
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: 12.4h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 10.5h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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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

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

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

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