September weather forecast
Anaheim, CA

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Beautiful residential area in Anaheim, California with a tall flat building in a distance
Beautiful residential area in Anaheim, California with a tall flat building in a distance

Weather in September

September marks the transition from summer to fall in Anaheim. While being a warm month, temperatures decrease slightly from the August peak to a high of 82.2°F (27.9°C). The climate in October will continue this cooling trend but retain the humidity levels. The UV index decreases somewhat, giving way to more comfortable conditions. Rainfall slightly increases, heralding the beginning of the wet season.

Temperature

The advent of September in Anaheim brings an average high-temperature of a still moderately hot 82.2°F (27.9°C), exhibiting minor difference from the previous month. The average low-temperature of 64.8°F (18.2°C) is witnessed in Anaheim, California, during September.

Heat index

For most parts of September, the heat index is computed to be 84.2°F (29°C). Prolonged activity during exposure might result in a state of fatigue and cause heat cramps.
Always consider that heat index estimations are for light winds and places in the shade. With 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 'real feel' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.

Humidity

In September, the average relative humidity is 58%.

Rainfall

In Anaheim, in September, during 3.5 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. Throughout the year, in Anaheim, there are 52.5 rainfall days, and 7.09" (180mm) of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 22min.
On the first day of September in Anaheim, sunrise is at 6:25 am and sunset at 7:16 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:36 pm PDT.

Sunshine

In September, the average sunshine in Anaheim is 10.6h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the average person.
Note: The maximum UV index of 6 during September translates into these guidelines:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
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Frequently asked questions

What is the temperature in September in Anaheim?

During September, Anaheim experiences an average high-temperature of 82.2°F (27.9°C) and a low-temperature of 64.8°F (18.2°C). In September, the average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, is computed to be 84.2°F (29°C).

What is the average humidity in September in Anaheim?

In Anaheim, the average relative humidity in September is 58%.

How much does it rain in Anaheim in September?

In Anaheim, in September, during 3.5 rainfall days, 0.2" (5mm) of precipitation is typically accumulated.

How many hours of daylight does Anaheim have in September?

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

What time are sunrise and sunset in September in Anaheim?

In September, on the first day of the month, sunrise is at 6:25 am and sunset at 7:16 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:36 pm PDT.

How many hours of sunshine does Anaheim have in September?

In September, the average sunshine duration in Anaheim is 10.6h.

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

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

How high is the UV index in September in Anaheim?

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

Average temperature in September
Anaheim, CA

Average temperature in September - Anaheim, CA
  • Average high temperature in September: 82.2°F

The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (64°F).

  • Average low temperature in September: 64.8°F

The month with the highest average low temperature is August (65.5°F).
The coldest month (with the lowest average low temperature) is February (50.2°F).

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Average pressure in September
Anaheim, CA

Average pressure in September - Anaheim, CA
  • Average pressure in September: 29.89"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed in September
Anaheim, CA

Average wind speed in September - Anaheim, CA
  • Average wind speed in September: 4.7mph

The windiest month (with the highest average wind speed) is April (6mph).
The calmest months (with the lowest average wind speed) are September and October (4.7mph).

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Average humidity in September
Anaheim, CA

Average humidity in September - Anaheim, CA
  • Average humidity in September: 58%

The month with the highest relative humidity is June (65%).
The month with the lowest relative humidity is November (51%).

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Average rainfall in September
Anaheim, CA

Average rainfall in September - Anaheim, CA
  • Average rainfall in September: 0.2"

The wettest month (with the highest rainfall) is December (1.54").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Anaheim, CA

Average rainfall days in September - Anaheim, CA
  • Average rainfall days in September: 3.5 days

The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is June (1.5 days).

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

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

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 10h and 4min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

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Average sunshine days in September
Anaheim, CA

Average sunshine days in September - Anaheim, CA
  • Average sunshine days in September: 23.4 days

The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is February (20.6 days).

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Average UV index in September
Anaheim, CA

Average UV index in September - Anaheim, 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 January, February, November and December (UV index 4).

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Average cloud cover in September
Anaheim, CA

Average cloud cover in September - Anaheim, CA
  • Average cloud cover in September: 9

The months with the most cloud cover are March and December (Cloud cover 22).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in September
Anaheim, CA

Average visibility in September - Anaheim, 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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Anaheim, California, USA

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