September weather forecast
Brisbane, CA

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Weather in September

September, the first month of the autumn in Brisbane, is still a pleasant month, with an average temperature fluctuating between 56.5°F (13.6°C) and 70°F (21.1°C).

Temperature

With average high temperatures of 70°F (21.1°C) and lows of 56.5°F (13.6°C), September is the warmest month.

Humidity

In Brisbane, the average relative humidity in September is 73%.

Rainfall

In September, in Brisbane, California, the rain falls for 1.9 days. Throughout September, 0.08" (2mm) of precipitation is accumulated. Throughout the year, there are 53.6 rainfall days, and 3.9" (99mm) of precipitation is accumulated.

Daylight

In Brisbane, California, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:40 am and sunset at 7:38 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:53 pm PDT.

Sunshine

The average sunshine in September in Brisbane is 10.8h.

UV index

The months with the highest UV index are June through September, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum daily UV index of 5 during September morphs into the following directions:
Act with care - The need to guard against sun damage is communicated. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.

Frequently asked questions

What part of the year is the hottest in Brisbane?

September, with average temperatures reaching a high of 70°F (21.1°C) and a low of 56.5°F (13.6°C), is the warmest month.

What is the usual temperature for Brisbane in September?

The high-temperature, in September, in Brisbane, is 70°F (21.1°C), while the low-temperature averages to 56.5°F (13.6°C).

What is the average humidity in September in Brisbane?

The average relative humidity in September in Brisbane is 73%.

How many days does it rain in September in Brisbane?

In Brisbane, during September, the rain falls for 1.9 days and regularly aggregates up to 0.08" (2mm) of precipitation.

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

In Brisbane, the average day length in September is 12h and 25min.

When is the sunrise / sunset in September in Brisbane?

In September, on the first day of the month, sunrise is at 6:40 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:53 pm PDT.

How many hours of sunshine does Brisbane have in September?

The average sunshine duration in September in Brisbane, California, is 10.8h.

What is the month with the highest UV index in Brisbane?

The months with the highest UV index are June through September, with an average maximum UV index of 5.

What is the UV index intensity in September in Brisbane?

In Brisbane, California, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Brisbane, CA

Average temperature in September - Brisbane, CA
  • Average high temperature in September: 70°F

The warmest month (with the highest average high temperature) is September (70°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in September: 56.5°F

The months with the highest average low temperature are August and September (56.5°F).
The coldest months (with the lowest average low temperature) are January, February and December (47.8°F).

Average pressure in September
Brisbane, CA

Average pressure in September - Brisbane, CA
  • Average pressure in September: 29.92"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).

Average wind speed in September
Brisbane, CA

Average wind speed in September - Brisbane, CA
  • Average wind speed in September: 6.2mph

The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is September (6.2mph).

Average humidity in September
Brisbane, CA

Average humidity in September - Brisbane, CA
  • Average humidity in September: 73%

The month with the highest relative humidity is August (78%).
The months with the lowest relative humidity are October and November (71%).

Average rainfall in September
Brisbane, CA

Average rainfall in September - Brisbane, CA
  • Average rainfall in September: 0.08"

The wettest month (with the highest rainfall) is February (0.79").
The driest months (with the least rainfall) are June, July and August (0.04").

Average rainfall days in September
Brisbane, CA

Average rainfall days in September - Brisbane, CA
  • Average rainfall days in September: 1.9 days

The month with the highest number of rainy days is March (9.4 days).
The month with the least rainy days is June (1.1 days).

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

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

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in September: 10h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

Average sunshine days in September
Brisbane, CA

Average sunshine days in September - Brisbane, CA
  • Average sunshine days in September: 26.3 days

The months with the most sunshine days are June, July and September (26.3 days).
The month with the least sunshine days is March (19.4 days).

Average UV index in September
Brisbane, CA

Average UV index in September - Brisbane, CA
  • Average UV index in September: 5

The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February and December (UV index 3).

Average cloud cover in September
Brisbane, CA

Average cloud cover in September - Brisbane, CA
  • Average cloud cover in September: 16

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is September (Cloud cover 16).

Average visibility in September
Brisbane, CA

Average visibility in September - Brisbane, 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).

Brisbane, California, USA

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