July weather forecastSunnyvale, CA
July
Weather in July
July exhibits the height of summer in Sunnyvale with the highest average high temperature of the year at 79.9°F (26.6°C). Interestingly, despite the negligible rainfall seen in July, the relative humidity remains steady. As the sunshine hours maintain near their peak, wind speed sees a decline, just under 5mph (8km/h), indicating tranquil, sunny days. The warmth of the day extends well into the evening, thanks to clear skies and mild wind. July, therefore, becomes synonymous with sunny, balmy days ideal for outdoor activities.Temperature
The warmest period in Sunnyvale tends to be July, when average temperatures fluctuate between a high of 79.9°F (26.6°C) and a low of 55.4°F (13°C).Humidity
The average relative humidity in July is 64%.Rainfall
The only month without rainfall is July.Daylight
In Sunnyvale, the average length of the day in July is 14h and 26min.On the first day of July in Sunnyvale, sunrise is at 5:51 am and sunset at 8:32 pm. On the last day of the month, sunrise is at 6:12 am and sunset at 8:16 pm PDT.
Sunshine
July has the most sunshine of the year, with an average of 12.1h of sunshine.UV index
The average daily maximum UV index in July is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average maximum UV index of 5 in July leads to these recommendations:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Sunnyvale, CA
- Average high temperature in July: 79.9°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 July: 55.4°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 July
Sunnyvale, CA
- Average pressure in July: 29.93"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 July
Sunnyvale, CA
- Average wind speed in July: 4.8mph
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 July
Sunnyvale, CA
- Average humidity in July: 64%
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 July
Sunnyvale, CA
- Average rainfall in July: 0"
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 July
Sunnyvale, CA
- Average rainfall days in July: 1.3 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 July /
Average sunshine in July
Sunnyvale, CA
- Average daylight in July: 14h and 24min
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 July: 12h and 6min
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 July
Sunnyvale, CA
- Average sunshine days in July: 29.8 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 July
Sunnyvale, CA
- Average UV index in July: 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 July
Sunnyvale, CA
- Average cloud cover in July: 7
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 July
Sunnyvale, CA
- Average visibility in July: 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).
