May weather forecast
Westmont, CA

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Weather in May

The last month of the spring, May, is also an agreeable month in Westmont, California, with an average temperature varying between 70.3°F (21.3°C) and 56.8°F (13.8°C).

Temperature

May commences with an average high-temperature of a still pleasant 70.3°F (21.3°C), showing little deviation from April's 68.9°F (20.5°C). Westmont's temperature tends to fall to an average low of 56.8°F (13.8°C) during the nights of May.

Humidity

In Westmont, the average relative humidity in May is 67%.

Rainfall

In Westmont, in May, during 4.4 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. In Westmont, during the entire year, the rain falls for 47.6 days and collects up to 7.24" (184mm) of precipitation.

Daylight

In Westmont, the average length of the day in May is 13h and 56min.
On the first day of the month, sunrise is at 6:03 am and sunset at 7:37 pm. On the last day of May, sunrise is at 5:43 am and sunset at 7:58 pm PDT.

Sunshine

The average sunshine in May is 11.1h.

UV index

In May, the average daily maximum UV index in Westmont is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.
Note: In May, a daily maximum UV index of 5 leads to the following instructions:
Heed the precautions - Suggestions to avoid sunburn are made. To avoid the Sun's strongest rays, limit exposure around the mid-day period. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
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Frequently asked questions

What are May temperatures in Westmont?

In May, in Westmont, the average high-temperature is 70.3°F (21.3°C), and the average low-temperature is 56.8°F (13.8°C).

What is the average humidity in May in Westmont?

The average relative humidity in May is 67%.

How many days does it rain in May in Westmont?

In Westmont, during May, the rain falls for 4.4 days and regularly aggregates up to 0.24" (6mm) of precipitation.

What is the average length of the day in May in Westmont?

The average day length in May in Westmont, California, is 13h and 56min.

When is the sunrise / sunset in May in Westmont?

In May, on the first day of the month, sunrise is at 6:03 am and sunset at 7:37 pm. On the last day of the month, in Westmont, California, sunrise is at 5:43 am and sunset at 7:58 pm PDT.

How many hours of sunshine does Westmont have in May?

In May, the average sunshine duration in Westmont is 11.1h.

What is the UV index reading in May in Westmont?

The average daily maximum UV index in May in Westmont, California, is 5. A UV Index estimate of 3 to 5 represents a moderate 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 May
Westmont, CA

Average temperature in May - Westmont, CA
  • Average high temperature in May: 70.3°F

The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (64°F).

  • Average low temperature in May: 56.8°F

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (51.1°F).

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Average pressure in May
Westmont, CA

Average pressure in May - Westmont, CA
  • Average pressure in May: 29.93"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in May
Westmont, CA

Average wind speed in May - Westmont, CA
  • Average wind speed in May: 6mph

The windiest month (with the highest average wind speed) is April (6.4mph).
The calmest month (with the lowest average wind speed) is September (4.9mph).

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Average humidity in May
Westmont, CA

Average humidity in May - Westmont, CA
  • Average humidity in May: 67%

The month with the highest relative humidity is June (70%).
The month with the lowest relative humidity is November (54%).

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Average rainfall in May
Westmont, CA

Average rainfall in May - Westmont, CA
  • Average rainfall in May: 0.24"

The wettest month (with the highest rainfall) is January (1.42").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in May
Westmont, CA

Average rainfall days in May - Westmont, CA
  • Average rainfall days in May: 4.4 days

The month with the highest number of rainy days is March (6.5 days).
The month with the least rainy days is June (1.7 days).

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

Average daylight in May / Average sunshine in May - Westmont, CA
  • Average daylight in May: 13h and 5min

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 May: 11h and 1min

The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

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Average sunshine days in May
Westmont, CA

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

The month with the most sunshine days is October (25.5 days).
The month with the least sunshine days is June (21.4 days).

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Average UV index in May
Westmont, CA

Average UV index in May - Westmont, CA
  • Average UV index in May: 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 May
Westmont, CA

Average cloud cover in May - Westmont, CA
  • Average cloud cover in May: 19

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 7).

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Average visibility in May
Westmont, CA

Average visibility in May - Westmont, CA
  • Average visibility in May: 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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Westmont, California, USA

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