September weather forecast
San Juan Capistrano, CA

Weather in September

September, the first month of the autumn in San Juan Capistrano, is also a moderately hot month, with temperature in the range of an average low of 63.1°F (17.3°C) and an average high of 77.4°F (25.2°C).

Temperature

With an average high-temperature of 77.4°F (25.2°C) and an average low-temperature of 63.1°F (17.3°C), September is the warmest month.

Humidity

The average relative humidity in September is 68%.

Rainfall

In San Juan Capistrano, it is raining for 5.6 days, with typically 0.39" (10mm) of accumulated precipitation. In San Juan Capistrano, during the entire year, the rain falls for 69 days and collects up to 9.09" (231mm) of precipitation.

Daylight

In September, the average length of the day in San Juan Capistrano is 12h and 22min.
On the first day of September in San Juan Capistrano, sunrise is at 6:24 am and sunset at 7:16 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:36 pm PDT.

Sunshine

In September, the average sunshine is 10.3h.

UV index

July through September, with an average maximum UV index of 6, are months with the highest UV index in San Juan Capistrano. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 6 in September interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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 warmest month in San Juan Capistrano?

The warmest month is September, with an average high-temperature of 77.4°F (25.2°C) and an average low-temperature of 63.1°F (17.3°C).

What is the temperature in September in San Juan Capistrano?

In September, in San Juan Capistrano, California, the average high-temperature is 77.4°F (25.2°C), and the average low-temperature is 63.1°F (17.3°C).

What is the average humidity in September in San Juan Capistrano?

In September, the average relative humidity is 68%.

How many days does it rain in September in San Juan Capistrano?

In September, the rain falls for 5.6 days. Throughout September, 0.39" (10mm) of precipitation is accumulated.

What is the average length of the day in September in San Juan Capistrano?

The average day length in September in San Juan Capistrano, California, is 12h and 22min.

When is the sunrise / sunset in September in San Juan Capistrano?

On the first day of September, sunrise is at 6:24 am and sunset at 7:16 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:36 pm PDT.

How many hours of sunshine does San Juan Capistrano have in September?

In San Juan Capistrano, California, the average sunshine duration in September is 10.3h.

When is the highest UV index in San Juan Capistrano?

July 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 San Juan Capistrano?

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

Average temperature in September
San Juan Capistrano, CA

Average temperature in September - San Juan Capistrano, CA
  • Average high temperature in September: 77.4°F

The warmest month (with the highest average high temperature) is September (77.4°F).
The month with the lowest average high temperature is December (62.4°F).

  • Average low temperature in September: 63.1°F

The month with the highest average low temperature is August (63.3°F).
The coldest month (with the lowest average low temperature) is February (50°F).

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Average pressure in September
San Juan Capistrano, CA

Average pressure in September - San Juan Capistrano, CA
  • Average pressure in September: 29.89"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed in September
San Juan Capistrano, CA

Average wind speed in September - San Juan Capistrano, CA
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is April (6.3mph).
The calmest months (with the lowest average wind speed) are August, September and October (5mph).

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Average humidity in September
San Juan Capistrano, CA

Average humidity in September - San Juan Capistrano, CA
  • Average humidity in September: 68%

The month with the highest relative humidity is June (74%).
The month with the lowest relative humidity is November (59%).

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Average rainfall in September
San Juan Capistrano, CA

Average rainfall in September - San Juan Capistrano, CA
  • Average rainfall in September: 0.39"

The wettest month (with the highest rainfall) is December (1.85").
The driest month (with the least rainfall) is June (0.12").

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Average rainfall days in September
San Juan Capistrano, CA

Average rainfall days in September - San Juan Capistrano, CA
  • Average rainfall days in September: 5.6 days

The month with the highest number of rainy days is March (7.8 days).
The month with the least rainy days is June (3 days).

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Average daylight in September /
Average sunshine in September
San Juan Capistrano, CA

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

The month with the longest days is June (Average daylight: 14h and 20min).
The month with the shortest days is December (Average daylight: 9h and 59min).

  • Average sunshine in September: 10h and 18min

The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).

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Average sunshine days in September
San Juan Capistrano, CA

Average sunshine days in September - San Juan Capistrano, CA
  • Average sunshine days in September: 21.5 days

The month with the most sunshine days is January (24.7 days).
The month with the least sunshine days is May (19.5 days).

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Average UV index in September
San Juan Capistrano, CA

Average UV index in September - San Juan Capistrano, CA
  • Average UV index in September: 6

The months with the highest UV index are July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).

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Average cloud cover in September
San Juan Capistrano, CA

Average cloud cover in September - San Juan Capistrano, CA
  • Average cloud cover in September: 14

The month with the most cloud cover is March (Cloud cover 27).
The month with the least cloud cover is August (Cloud cover 11).

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Average visibility in September
San Juan Capistrano, CA

Average visibility in September - San Juan Capistrano, 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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