May weather forecast and climate
Altadena, CA

Weather in May

May, the last month of the spring, in Altadena, is also an agreeable month, with average temperature fluctuating between 73.2°F (22.9°C) and 53.2°F (11.8°C).

Temperature

In May, the average high-temperature is practically the same as in April - a still agreeable 73.2°F (22.9°C). In May, in Altadena, the average low-temperature is 53.2°F (11.8°C).

Humidity

Months with the highest humidity in Altadena are March, May and June, with an average relative humidity of 56%.

Rainfall

In Altadena, during May, the rain falls for 3.5 days and regularly aggregates up to 0.28" (7mm) of precipitation. In Altadena, during the entire year, the rain falls for 52 days and collects up to 8.82" (224mm) of precipitation.

Daylight

In May, the average length of the day in Altadena is 14h.

Sunshine

In Altadena, California, the average sunshine in May is 11.7h.

UV index

In May, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to the UV radiation for the ordinary person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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 Altadena?

The average high-temperature, in May, in Altadena, is 73.2°F (22.9°C), while the average low-temperature is 53.2°F (11.8°C).

What is the most humid month in Altadena?

March, May and June, with an average relative humidity of 56%, are most humid months in Altadena.

What is the average humidity in May in Altadena?

In May, the average relative humidity in Altadena is 56%.

How many days does it rain in May in Altadena?

In May, in Altadena, California, the rain falls for 3.5 days. Throughout May, 0.28" (7mm) of precipitation is accumulated.

How many hours of daylight does Altadena have in May?

In Altadena, California, the average length of the day in May is 14h.

How many hours of sunshine does Altadena have in May?

In May, the average sunshine in Altadena, California, is 11.7h.

How high is the UV index in May in Altadena?

In May, the average daily maximum UV index in Altadena is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in May
Altadena, CA

Average temperature in May - Altadena, CA
  • Average high temperature in May: 73.2°F

The warmest month (with the highest average high temperature) is August (86.2°F).
The month with the lowest average high temperature is December (61°F).

  • Average low temperature in May: 53.2°F

The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).

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Average pressure in May
Altadena, CA

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

The month with the highest atmospheric pressure is January (30.11").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in May
Altadena, CA

Average wind speed in May - Altadena, CA
  • Average wind speed in May: 5.7mph

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

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Average humidity in May
Altadena, CA

Average humidity in May - Altadena, CA
  • Average humidity in May: 56%

Months with the highest relative humidity are March, May and June (56%).
The month with the lowest relative humidity is November (46%).

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Average rainfall in May
Altadena, CA

Average rainfall in May - Altadena, CA
  • Average rainfall in May: 0.28"

The wettest month (with the highest rainfall) is February (1.81").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in May
Altadena, CA

Average rainfall days in May - Altadena, CA
  • Average rainfall days in May: 3.5 days

The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.3 days).

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Average daylight in May /
Average sunshine in May
Altadena, CA

Average daylight in May / Average sunshine in May - Altadena, CA
  • Average daylight in May: 14h

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: 11.7h

Months with the most sunshine are June and July (Average sunshine: 12.1h).
Months with the least sunshine are February and December (Average sunshine: 6.9).

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Average sunshine days in May
Altadena, CA

Average sunshine days in May - Altadena, CA
  • Average sunshine days in May: 25.4 days

The month with the most sunshine days is June (27.2 days).
The month with the least sunshine days is February (21.3 days).

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Average UV index in May
Altadena, CA

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

Months with the highest UV index are June, July, August and September (UV index 6).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in May
Altadena, CA

Average cloud cover in May - Altadena, CA
  • Average cloud cover in May: 12

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

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Average visibility in May
Altadena, CA

Average visibility in May - Altadena, 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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