May weather forecast
Sunnyvale, CA

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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

May witnesses a significant leap in the average high temperature, marking the onset of warmer weather conditions in Sunnyvale. The rainfall drops drastically to an average of 0.2" (5mm), with only three rainy days throughout the month. This decrease in precipitation along with an increase in sunshine hours marks the progressive shift towards summer. A decline in the relative humidity accompanies the rising temperatures, offering a dry and warm ambience. With over 14 hours of daylight, Sunnyvale basks in a vibrant summery glow throughout May.

Temperature

The shift into May uncovers an average high-temperature of a pleasant 69.4°F (20.8°C), subtly different from the previous month. An average nighttime temperature of 49.6°F (9.8°C) is recorded during May.

Humidity

In May, the average relative humidity is 68%.

Rainfall

In Sunnyvale, California, in May, during 3.1 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. In Sunnyvale, during the entire year, the rain falls for 50 days and collects up to 3.9" (99mm) of precipitation.

Daylight

In Sunnyvale, the average length of the day in May is 14h and 12min.
On the first day of the month, sunrise is at 6:11 am and sunset at 7:58 pm. On the last day of May, sunrise is at 5:48 am and sunset at 8:22 pm PDT.

Sunshine

The average sunshine in May in Sunnyvale is 10.9h.

UV index

In Sunnyvale, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The UV index of 5 in May translates into these instructions:
Ensure safety - Imperative it is to shield skin and eyes from damage. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
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Frequently asked questions

What are May temperatures in Sunnyvale?

The average high-temperature, in May, in Sunnyvale, is 69.4°F (20.8°C), while the average low-temperature is 49.6°F (9.8°C).

What is the average humidity in May in Sunnyvale?

The average relative humidity in May in Sunnyvale, California, is 68%.

How many days does it rain in May in Sunnyvale?

In Sunnyvale, during May, the rain falls for 3.1 days and regularly aggregates up to 0.2" (5mm) of precipitation.

How many hours of daylight does Sunnyvale have in May?

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

What time are sunrise and sunset in May in Sunnyvale?

On the first day of May in Sunnyvale, California, sunrise is at 6:11 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 8:22 pm PDT.

How long on average sun shines in May in Sunnyvale?

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

How high is the UV index in May in Sunnyvale?

In Sunnyvale, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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 1min

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 36min).

  • Average sunshine in May: 10h and 5min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

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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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Sunnyvale, California, USA

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