May weather forecastSunnyvale, CA
May
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
With the advent of May, Sunnyvale's high-temperatures adjust to a pleasant 69.4°F (20.8°C), closely aligning with the preceding month. Sunnyvale witnesses an average low-temperature of 49.6°F (9.8°C) throughout the month of May.Humidity
In Sunnyvale, the average relative humidity in May is 68%.Rainfall
In May, in Sunnyvale, the rain falls for 3.1 days. Throughout May, 0.2" (5mm) of precipitation is accumulated. Throughout the year, there are 50 rainfall days, and 3.9" (99mm) of precipitation is accumulated.Daylight
In May, the average length of the day 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
In Sunnyvale, the average sunshine in May is 10.9h.UV index
In May, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: A maximum UV index of 5 in May translates into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. Minimize direct exposure to the Sun during midday when its radiation is at its peak. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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 36min).
- Average sunshine in May: 10h and 54min
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).
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).
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).
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).
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).
