May weather forecast
London, CA

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Weather in May

May, the last month of the spring in London, is a moderately hot month, with an average temperature varying between 81°F (27.2°C) and 54.9°F (12.7°C).

Temperature

In London, the average high-temperature in May slightly increases from a pleasant 72.9°F (22.7°C) in April to a warm 81°F (27.2°C). May nights in London, California, see a notable contrast from daytime highs, with the nighttime temperature averaging at a fresh 54.9°F (12.7°C).

Heat index

The heat index value during May is appraised at 80.6°F (27°C). One might feel worn out with persistent exposure and activity, resulting in heat cramps.
Heat index details are generally centered around shaded locations and a mild breeze. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', evaluates the perceived heat by adding the effect of moisture in the air. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular significance for children. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.

Humidity

In May, the average relative humidity in London is 46%.

Rainfall

In May, in London, the rain falls for 4.9 days. Throughout May, 1.18" (30mm) of precipitation is accumulated. In London, during the entire year, the rain falls for 62.1 days and collects up to 13.31" (338mm) of precipitation.

Snowfall

In London, snow does not fall in January, March through December.

Daylight

In May, the average length of the day in London is 14h and 8min.
On the first day of May, sunrise is at 6:03 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 8:10 pm PDT.

Sunshine

In May, the average sunshine in London is 11.5h.

UV index

In May, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index, 6 in May, converts into the following recommendations:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
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Frequently asked questions

What is the average May temperature in London?

The average high-temperature and low-temperature in London during May are 81°F (27.2°C) and 54.9°F (12.7°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, in May is appraised at 80.6°F (27°C).

What is the average humidity in May in London?

The average relative humidity in May in London is 46%.

How much does it rain in London in May?

In London, California, in May, during 4.9 rainfall days, 1.18" (30mm) of precipitation is typically accumulated.

When it does not snow in London?

In London, snow does not fall in January, March through December.

How many hours of daylight does London have in May?

In London, California, the average day length in May is 14h and 8min.

When is the sunrise / sunset in May in London?

In May, on the first day of the month, sunrise is at 6:03 am and sunset at 7:46 pm. On the last day of the month, in London, sunrise is at 5:41 am and sunset at 8:10 pm PDT.

How long on average sun shines in May in London?

In London, California, the average sunshine duration in May is 11.5h.

What is the UV index intensity in May in London?

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

Average temperature in May
London, CA

Average temperature in May - London, CA
  • Average high temperature in May: 81°F

The warmest month (with the highest average high temperature) is July (100.4°F).
The month with the lowest average high temperature is December (56.3°F).

  • Average low temperature in May: 54.9°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is December (41.7°F).

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Average pressure in May
London, CA

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

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed in May
London, CA

Average wind speed in May - London, CA
  • Average wind speed in May: 5.4mph

The windiest month (with the highest average wind speed) is June (5.8mph).
The calmest months (with the lowest average wind speed) are January and December (4.1mph).

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Average humidity in May
London, CA

Average humidity in May - London, CA
  • Average humidity in May: 46%

The month with the highest relative humidity is January (67%).
The months with the lowest relative humidity are July and August (30%).

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Average rainfall in May
London, CA

Average rainfall in May - London, CA
  • Average rainfall in May: 1.18"

The wettest month (with the highest rainfall) is March (2.6").
The driest months (with the least rainfall) are June and August (0.08").

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Average rainfall days in May
London, CA

Average rainfall days in May - London, CA
  • Average rainfall days in May: 4.9 days

The month with the highest number of rainy days is March (11 days).
The month with the least rainy days is August (0.9 days).

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Average snowfall days in May
London, CA

Average snowfall days in May - London, CA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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

Average daylight in May / Average sunshine in May - London, CA
  • Average daylight in May: 14h and 1min

The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in May: 11h and 3min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).

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Average sunshine days in May
London, CA

Average sunshine days in May - London, CA
  • Average sunshine days in May: 25.3 days

The month with the most sunshine days is August (28.8 days).
The month with the least sunshine days is March (19.5 days).

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Average UV index in May
London, CA

Average UV index in May - London, CA
  • Average UV index in May: 6

The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 3).

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Average cloud cover in May
London, CA

Average cloud cover in May - London, CA
  • Average cloud cover in May: 16

The month with the most cloud cover is March (Cloud cover 29).
The months with the least cloud cover are July and August (Cloud cover 5).

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Average visibility in May
London, CA

Average visibility in May - London, 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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London, California, USA

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