May weather forecast and climate
Fullerton, CA

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 May

The last month of the spring, May, is another pleasant month in Fullerton, California, with temperature in the range of an average low of 56.1°F (13.4°C) and an average high of 72.3°F (22.4°C).

Temperature

In Fullerton, the average high-temperature in May is almost the same as in April - a still pleasant 72.3°F (22.4°C). In May, the average low-temperature is 56.1°F (13.4°C).

Humidity

In May, the average relative humidity is 64%.

Rainfall

In Fullerton, California, in May, it is raining for 4 days, with typically 0.2" (5mm) of accumulated precipitation. In Fullerton, during the entire year, the rain falls for 52.5 days and collects up to 7.09" (180mm) of precipitation.

Daylight

The average length of the day in May is 13.9h.

Sunshine

In May, the average sunshine is 11.3h.

UV index

In May, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in May in Fullerton?

In May, in Fullerton, California, the average high-temperature is 72.3°F (22.4°C), and the average low-temperature is 56.1°F (13.4°C).

What is the average humidity in May in Fullerton?

The average relative humidity in May in Fullerton, California, is 64%.

How much does it rain in Fullerton in May?

In Fullerton, during May, the rain falls for 4 days and regularly aggregates up to 0.2" (5mm) of precipitation.

How many hours of daylight does Fullerton have in May?

In Fullerton, the average length of the day in May is 13.9h.

How long on average sun shines in May in Fullerton?

The average sunshine in May in Fullerton, California, is 11.3h.

What is the UV index intensity in May in Fullerton?

The average daily maximum UV index in May in Fullerton, California, is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV radiation.

Average temperature in May
Fullerton, CA

Average temperature in May - Fullerton, CA
  • Average high temperature in May: 72.3°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 May: 56.1°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 May
Fullerton, CA

Average pressure in May - Fullerton, CA
  • Average pressure in May: 29.92"

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

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Average wind speed in May
Fullerton, CA

Average wind speed in May - Fullerton, CA
  • Average wind speed in May: 5.8mph

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 May
Fullerton, CA

Average humidity in May - Fullerton, CA
  • Average humidity in May: 64%

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 May
Fullerton, CA

Average rainfall in May - Fullerton, CA
  • Average rainfall in May: 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 May
Fullerton, CA

Average rainfall days in May - Fullerton, CA
  • Average rainfall days in May: 4 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 May /
Average sunshine in May
Fullerton, CA

Average daylight in May / Average sunshine in May - Fullerton, CA
  • Average daylight in May: 13.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in May: 11.3h

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in May
Fullerton, CA

Average sunshine days in May - Fullerton, CA
  • Average sunshine days in May: 23.6 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 May
Fullerton, CA

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

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

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Average cloud cover in May
Fullerton, CA

Average cloud cover in May - Fullerton, CA
  • Average cloud cover in May: 17

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 May
Fullerton, CA

Average visibility in May - Fullerton, CA
  • Average visibility in May: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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