October weather forecast
Fullerton, CA

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Trees and neat lawns of the famous Muckenthaler Community Center in Fullerton, California
Trees and neat lawns of the famous Muckenthaler Community Center in Fullerton, California

Weather in October

October brings noticeable changes in the weather with an average high temperature decreasing to 77.5°F (25.3°C). The rain in Fullerton starts to pick up marginally in October to 0.28" (7mm), making it a wetter month than September. This gradual shift towards slightly cooler conditions sets the pace for the impending winter season. The characteristic temperature range along with generous daylight presents enjoyable weather. Nonetheless, days become shorter as we witness a shorter daylight duration of 11.3 hours compared to September.

Temperature

Fullerton, California, observes a minor difference in average high-temperatures between September's 82.2°F (27.9°C) and October's 77.5°F (25.3°C). Fullerton anticipates an average minimum temperature of 61.5°F (16.4°C) in the month of October.

Humidity

In October, the average relative humidity in Fullerton is 56%.

Rainfall

In Fullerton, in October, during 3.5 rainfall days, 0.28" (7mm) of precipitation is typically accumulated. In Fullerton, California, during the entire year, the rain falls for 52.5 days and collects up to 7.09" (180mm) of precipitation.

Daylight

In October, the average length of the day in Fullerton is 11h and 19min.
On the first day of the month, sunrise is at 6:46 am and sunset at 6:35 pm. On the last day of October, in Fullerton, California, sunrise is at 7:10 am and sunset at 5:59 pm PDT.

Sunshine

In Fullerton, the average sunshine in October is 8.5h.

UV index

The average daily maximum UV index in October in Fullerton, California, is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 5 during October leads to these advisories:
Take precautions - Protection against skin and eye damage is obliged. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
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Frequently asked questions

What is the average October temperature in Fullerton?

The average high-temperature and low-temperature in Fullerton, California, during October are 77.5°F (25.3°C) and 61.5°F (16.4°C) respectively. The average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in September is appraised at 84.2°F (29°C).

What is the average humidity in October in Fullerton?

The average relative humidity in October in Fullerton is 56%.

How much does it rain in Fullerton in October?

In Fullerton, California, in October, during 3.5 rainfall days, 0.28" (7mm) of precipitation is typically accumulated.

How many hours of daylight does Fullerton have in October?

In Fullerton, California, the average day length in October is 11h and 19min.

What time are sunrise and sunset in October in Fullerton?

In October, on the first day of the month, sunrise is at 6:46 am and sunset at 6:35 pm. On the last day of the month, in Fullerton, sunrise is at 7:10 am and sunset at 5:59 pm PDT.

How many hours of sunshine does Fullerton have in October?

In October, the average sunshine duration in Fullerton is 8.5h.

What is the UV index intensity in October in Fullerton?

The average daily maximum UV index in October in Fullerton, California, is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to the Sun's 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 October
Fullerton, CA

Average temperature in October - Fullerton, CA
  • Average high temperature in October: 77.5°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 October: 61.5°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 October
Fullerton, CA

Average pressure in October - Fullerton, CA
  • Average pressure in October: 29.95"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 October
Fullerton, CA

Average wind speed in October - Fullerton, CA
  • Average wind speed in October: 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 October
Fullerton, CA

Average humidity in October - Fullerton, CA
  • Average humidity in October: 56%

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 October
Fullerton, CA

Average rainfall in October - Fullerton, CA
  • Average rainfall in October: 0.28"

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 October
Fullerton, CA

Average rainfall days in October - Fullerton, CA
  • Average rainfall days in October: 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 October /
Average sunshine in October
Fullerton, CA

Average daylight in October / Average sunshine in October - Fullerton, CA
  • Average daylight in October: 11h 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 October: 8h and 3min

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 October
Fullerton, CA

Average sunshine days in October - Fullerton, CA
  • Average sunshine days in October: 24.6 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 October
Fullerton, CA

Average UV index in October - Fullerton, CA
  • Average UV index in October: 5

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 October
Fullerton, CA

Average cloud cover in October - Fullerton, CA
  • Average cloud cover in October: 12

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 October
Fullerton, CA

Average visibility in October - Fullerton, CA
  • Average visibility in October: 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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Fullerton, California, USA

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