September weather forecast
Julian, CA

Weather in September

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

Temperature

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

Heat index

The average heat index in September is calculated to be a hot 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. Exposure to direct sunshine can increase heat index values 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 of how hot it feels when the actual air humidity is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, clothing, 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 particularly important for children. 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 Julian, the average relative humidity in September is 53%.

Rainfall

In Julian, during September, the rain falls for 5.5 days and regularly aggregates up to 0.51" (13mm) of precipitation. Throughout the year, there are 62 rainfall days, and 6.38" (162mm) of precipitation is accumulated.

Snowfall

June through October are months without snowfall.

Daylight

In Julian, the average length of the day in September is 12h and 22min.
On the first day of the month, sunrise is at 6:21 am and sunset at 7:11 pm. On the last day of September, in Julian, California, sunrise is at 6:40 am and sunset at 6:32 pm PDT.

Sunshine

The average sunshine in September is 10.4h.

UV index

The months with the highest UV index are June through September, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. 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.
[Resources]

FAQ

What is the temperature in September in Julian?

The average high-temperature, in September, in Julian, is 84.2°F (29°C), while the average low-temperature is 62.8°F (17.1°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in September is calculated to be 86°F (30°C).

What is the average humidity in September in Julian?

In Julian, California, the average relative humidity in September is 53%.

How much does it rain in Julian in September?

In September, the rain falls for 5.5 days. Throughout September, 0.51" (13mm) of precipitation is accumulated.

When it does not snow in Julian?

June through October are months without snowfall in Julian, California.

How many hours of daylight does Julian have in September?

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

When is the sunrise / sunset in September in Julian?

On the first day of September in Julian, sunrise is at 6:21 am and sunset at 7:11 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:32 pm PDT.

How many hours of sunshine does Julian have in September?

In September, the average sunshine duration in Julian, California, 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.

What is the UV index reading in September in Julian?

In September, the average daily maximum UV index in Julian is 6. A UV Index reading of 6 to 7 represents a high health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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).

[Resources]

Average pressure in September
Julian, CA

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

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

[Resources]

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).

[Resources]

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%).

[Resources]

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").

[Resources]

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).

[Resources]

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").
The months with the least snowfall are June, July, August, September and October (0").

[Resources]

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

Average daylight in September / Average sunshine in September - Julian, CA
  • Average daylight in September: 12h and 22min

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 1min).

  • Average sunshine in September: 10h and 24min

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 42min).

[Resources]

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).

[Resources]

Average UV index in September
Julian, CA

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

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

[Resources]

Average cloud cover in September
Julian, CA

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

The 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).

[Resources]

Average visibility in September
Julian, CA

Average visibility in September - Julian, 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]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location