May weather forecast
Sunnyvale, CA

The perfect blue sky, trees, buildings, and cute water fountain all reflected in the calm pool of water with birds in Sunnyvale, California
The perfect blue sky, trees, buildings, and cute water fountain all reflected in the calm pool of water with birds in Sunnyvale, California

Weather in May

The last month of the spring, May, is an agreeable month in Sunnyvale, California, with an average temperature varying between 69.4°F (20.8°C) and 49.6°F (9.8°C).

Temperature

In Sunnyvale, the average high-temperature in May is essentially the same as in April - an agreeable 69.4°F (20.8°C). In Sunnyvale, the average low-temperature is 49.6°F (9.8°C).

Humidity

The average relative humidity in May is 68%.

Rainfall

In Sunnyvale, during May, the rain falls for 3.1 days and regularly aggregates up to 0.2" (5mm) of precipitation. Throughout the year, in Sunnyvale, there are 50 rainfall days, and 3.9" (99mm) of precipitation is accumulated.

Daylight

The average length of the day in May is 14h and 12min.
On the first day of May in Sunnyvale, sunrise is at 6:12 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 8:22 pm PDT.

Sunshine

In Sunnyvale, the average sunshine in May is 10.9h.

UV index

In Sunnyvale, the average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 5 in May transform into the following instructions:
Take precautions - Protection against sunburn is recommended. 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 the 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 average humidity in May in Sunnyvale?

In May, the average relative humidity in Sunnyvale is 68%.

How much does it rain in Sunnyvale in May?

In Sunnyvale, in May, during 3.1 rainfall days, 0.2" (5mm) of precipitation is typically accumulated.

How many hours of daylight does Sunnyvale have in May?

In Sunnyvale, the average day length in May is 14h and 12min.

When is the sunrise / sunset in May in Sunnyvale?

In May, on the first day of the month, sunrise is at 6:12 am and sunset at 7:57 pm. On the last day of the month, in Sunnyvale, California, sunrise is at 5:49 am and sunset at 8:22 pm PDT.

How many hours of sunshine does Sunnyvale have in May?

In Sunnyvale, the average sunshine duration in May is 10.9h.

What is the UV index reading in May in Sunnyvale?

The average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unsafe exposure to Sun's UV rays.

Average temperature in May
Sunnyvale, CA

Average temperature in May - Sunnyvale, CA
  • Average high temperature in May: 69.4°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is December (56.8°F).

  • Average low temperature in May: 49.6°F

The month with the highest average low temperature is August (56.8°F).
The coldest months (with the lowest average low temperature) are February and December (44.2°F).

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Average pressure in May
Sunnyvale, CA

Average pressure in May - Sunnyvale, CA
  • Average pressure in May: 29.98"

The month with the highest atmospheric pressure is January (30.13").
The months with the lowest atmospheric pressure are June and September (29.92").

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Average wind speed in May
Sunnyvale, CA

Average wind speed in May - Sunnyvale, CA
  • Average wind speed in May: 6.1mph

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is September (4.6mph).

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Average humidity in May
Sunnyvale, CA

Average humidity in May - Sunnyvale, CA
  • Average humidity in May: 68%

The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are September and October (63%).

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Average rainfall in May
Sunnyvale, CA

Average rainfall in May - Sunnyvale, CA
  • Average rainfall in May: 0.2"

The wettest months (with the highest rainfall) are February and March (0.75").
The driest month (with the least rainfall) is July (0").

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Average rainfall days in May
Sunnyvale, CA

Average rainfall days in May - Sunnyvale, CA
  • Average rainfall days in May: 3.1 days

The month with the highest number of rainy days is March (9.6 days).
The month with the least rainy days is August (0.4 days).

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

Average daylight in May / Average sunshine in May - Sunnyvale, CA
  • Average daylight in May: 14h and 12min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 38min).

  • Average sunshine in May: 10.9h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.9h).

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Average sunshine days in May
Sunnyvale, CA

Average sunshine days in May - Sunnyvale, CA
  • Average sunshine days in May: 26.3 days

The month with the most sunshine days is August (30.1 days).
The month with the least sunshine days is March (19.9 days).

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Average UV index in May
Sunnyvale, CA

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

The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are February, November and December (UV index 3).

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Average cloud cover in May
Sunnyvale, CA

Average cloud cover in May - Sunnyvale, CA
  • Average cloud cover in May: 22

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 7).

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Average visibility in May
Sunnyvale, CA

Average visibility in May - Sunnyvale, 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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