September weather forecast and climate
Julian, CA

Weather in September

September, the first month of the autumn, in Julian, is also a moderately hot month, with average temperature varying between 84.2°F (29°C) and 62.8°F (17.1°C).

Temperature

In September, the average high-temperature is almost the same as in August - a warm 84.2°F (29°C). The average low-temperature, in Julian, is 62.8°F (17.1°C).

Heat index

The average heat index is evaluated at a tropical 86°F (30°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'apparent temperature', 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 individual, with diverse people perceiving weather differently for numerous reasons (clothing, pregnancy, wind), and activity. 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. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In Julian, the average relative humidity is 53%.

Rainfall

In Julian, California, it is raining for 5.5 days, with typically 0.51" (13mm) of accumulated precipitation. In Julian, during the entire year, the rain falls for 62 days and collects up to 6.38" (162mm) of precipitation.

Snowfall

June through October are months without snowfall.

Daylight

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

Sunshine

In September, the average sunshine is 10.4h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index in Julian. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Julian?

In September, in Julian, California, the average high-temperature is 84.2°F (29°C), and the average low-temperature is 62.8°F (17.1°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), that combines both air temperature and relative humidity, in September is calculated to 86°F (30°C).

What is the average humidity in September in Julian?

The average relative humidity in September in Julian is 53%.

How much does it rain in Julian in September?

In Julian, during September, the rain falls for 5.5 days and regularly aggregates up to 0.51" (13mm) of precipitation.

When it does not snow in Julian?

June through October are months without snowfall.

What is the average length of the day in September in Julian?

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

How long on average sun shines in September in Julian?

In Julian, California, the average sunshine in September is 10.4h.

When is the highest UV index in Julian?

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

What is the UV index intensity in September in Julian?

In Julian, California, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Julian, CA

Average temperature in September - Julian, CA
  • Average high temperature in September: 84.2°F

The warmest month (with the highest average high temperature) is August (87.3°F).
The month with the lowest average high temperature is December (61.3°F).

  • Average low temperature in September: 62.8°F

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (44.2°F).

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Average pressure in September
Julian, CA

Average pressure in September - Julian, CA
  • Average pressure in September: 29.86"

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is June (29.85").

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Average wind speed in September
Julian, CA

Average wind speed in September - Julian, CA
  • Average wind speed in September: 4.1mph

The windiest month (with the highest average wind speed) is May (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.1mph).

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Average humidity in September
Julian, CA

Average humidity in September - Julian, CA
  • Average humidity in September: 53%

The month with the highest relative humidity is May (62%).
The month with the lowest relative humidity is November (51%).

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Average rainfall in September
Julian, CA

Average rainfall in September - Julian, CA
  • Average rainfall in September: 0.51"

The wettest month (with the highest rainfall) is February (0.94").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in September
Julian, CA

Average rainfall days in September - Julian, CA
  • Average rainfall days in September: 5.5 days

The month with the highest number of rainy days is March (7.6 days).
The month with the least rainy days is June (1.5 days).

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Average snowfall in September
Julian, CA

Average snowfall in September - Julian, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (6.7").
Months with the least snowfall are June, July, August, September and October (0").

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

Average daylight in September / Average sunshine in September - Julian, 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: 10.4h

Months with the most sunshine are June and 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
Julian, CA

Average sunshine days in September - Julian, CA
  • Average sunshine days in September: 21.8 days

The month with the most sunshine days is June (27.5 days).
The month with the least sunshine days is July (19.4 days).

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Average UV index in September
Julian, CA

Average UV index in September - Julian, CA
  • Average UV index in September: 6

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are November and December (UV index 3).

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Average cloud cover in September
Julian, CA

Average cloud cover in September - Julian, CA
  • Average cloud cover in September: 8

Months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 6).

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Average visibility in September
Julian, CA

Average visibility in September - Julian, 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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