Contents
- Weather in July
- Frequently asked questions
- Average temperature in July
- Average pressure in July
- Average wind speed in July
- Average humidity in July
- Average rainfall in July
- Average rainfall days in July
- Average daylight in July
- Average sunshine in July
- Average sunshine days in July
- Average UV index in July
- Average cloud cover in July
- Average visibility in July
Weather in July
Temperature
Portola Valley, California, sees the arrival of July with an average high-temperature of a still agreeable 72.7°F (22.6°C), indicating a subtle variation from June. During July, Portola Valley's temperature averages to a cool 54.7°F (12.6°C) at night.Humidity
In July, the average relative humidity in Portola Valley is 73%.Rainfall
In Portola Valley, California, in July, it is raining for 1.5 days, with typically 0.08" (2mm) of accumulated precipitation. In Portola Valley, during the entire year, the rain falls for 57.5 days and collects up to 4.76" (121mm) of precipitation.Daylight
In Portola Valley, the average length of the day in July is 14h and 26min.On the first day of the month, sunrise is at 5:52 am and sunset at 8:33 pm. On the last day of July, in Portola Valley, sunrise is at 6:13 am and sunset at 8:17 pm PDT.
Sunshine
With an average of 12h of sunshine, July has the most sunshine of the year.UV index
June through September, with an average maximum UV index of 5, are months with the highest UV index. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: The UV index of 5 during July translates into the following guidance:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in July in Portola Valley?
What is the average humidity in July in Portola Valley?
How much does it rain in Portola Valley in July?
How many hours of daylight does Portola Valley have in July?
What time are sunrise and sunset in July in Portola Valley?
What month has the most sunshine in Portola Valley?
How many hours of sunshine does Portola Valley have in July?
When is the highest UV index in Portola Valley?
How high is the UV index in July in Portola Valley?
Average temperature in July
Portola Valley, CA
- Average high temperature in July: 72.7°F
The warmest month (with the highest average high temperature) is August (73°F).
The month with the lowest average high temperature is December (55.8°F).
- Average low temperature in July: 54.7°F
The months with the highest average low temperature are August and September (56.7°F).
The coldest months (with the lowest average low temperature) are January and February (46.4°F).
Average pressure in July
Portola Valley, CA
- Average pressure in July: 29.94"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).
Average wind speed in July
Portola Valley, CA
- Average wind speed in July: 5.7mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in July
Portola Valley, CA
- Average humidity in July: 73%
The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is October (68%).
Average rainfall in July
Portola Valley, CA
- Average rainfall in July: 0.08"
The wettest month (with the highest rainfall) is February (0.98").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in July
Portola Valley, CA
- Average rainfall days in July: 1.5 days
The month with the highest number of rainy days is March (10.6 days).
The month with the least rainy days is June (0.9 days).
Average daylight in July /
Average sunshine in July
Portola Valley, CA
- Average daylight in July: 14h and 2min
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 0min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in July
Portola Valley, CA
- Average sunshine days in July: 26.3 days
The months with the most sunshine days are June and July (26.3 days).
The month with the least sunshine days is March (18.3 days).
Average UV index in July
Portola Valley, CA
- Average UV index in July: 5
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in July
Portola Valley, CA
- Average cloud cover in July: 9
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in July
Portola Valley, 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).
Portola Valley, California, USA
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