June weather forecastPortola Valley, CA
June
Weather in June
The first month of the summer, June, is a pleasant month in Portola Valley, California, with an average temperature varying between 70°F (21.1°C) and 53.4°F (11.9°C).Temperature
Portola Valley's average high-temperature marks a pleasant 70°F (21.1°C) with the advent of June, closely mirroring that of the preceding month. During the nights in June, the temperature averages to a cool 53.4°F (11.9°C).Humidity
In Portola Valley, the average relative humidity in June is 72%.Rainfall
June is the month with the least rainfall in Portola Valley. Rain falls for 0.9 days and accumulates 0.04" (1mm) of precipitation.Daylight
With an average of 14h and 42min of daylight, June has the longest days of the year.On the first day of June in Portola Valley, sunrise is at 5:49 am and sunset at 8:24 pm. On the last day of the month, sunrise is at 5:51 am and sunset at 8:33 pm PDT.
Sunshine
The average sunshine in June in Portola Valley is 11.7h.UV index
The months with the highest UV index are June through September, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In June, the maximum UV index of 5 suggests these recommendations:
Ensure safety - Recommendations to avert sunburn are presented. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in June
Portola Valley, CA
- Average high temperature in June: 70°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 June: 53.4°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 June
Portola Valley, CA
- Average pressure in June: 29.93"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 June
Portola Valley, CA
- Average wind speed in June: 6.8mph
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 June
Portola Valley, CA
- Average humidity in June: 72%
The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is October (68%).
Average rainfall in June
Portola Valley, CA
- Average rainfall in June: 0.04"
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 June
Portola Valley, CA
- Average rainfall days in June: 0.9 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 June /
Average sunshine in June
Portola Valley, CA
- Average daylight in June: 14h and 42min
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 June: 11h and 42min
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 June
Portola Valley, CA
- Average sunshine days in June: 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 June
Portola Valley, CA
- Average UV index in June: 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 June
Portola Valley, CA
- Average cloud cover in June: 14
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 June
Portola Valley, CA
- Average visibility in June: 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).
