Solar Energy & Solar Power Resources

Solar Power in 94028 (Portola Valley, CA)

Solar Energy in 94028

Sorry, historical solar radition values for 94028 are currently unavailable, please check back later.

Solar Panels in 94028

Solar panels in 94028 that will produce the maximum solar energy output. [More]

Sunrise & Sunset in 94028

The total length of the day in 94028 (Portola Valley, CA) today (August 24, 2026) will be 13 hours and 19 minutes. [More]

Solar Energy in 94028 (Portola Valley, CA)

Solar Energy Data for 94028

See the chart below to see how different types of solar panel installations compare in 94028.

Historical solar power output data for Portola Valley is not currently available.

Solar Energy Analysis for 94028

Sorry, it is not possible to complete our solar energy analysis for 94028 at this time.

Please check back later.

Solar Energy Glossary

Global Horizontal Irradiance (GHI)

Global Horizontal Irradiance: The total amount of solar radiation that is received per unit area by a surface that is always positioned in a horizontal manner.

Direct Normal Irradiance (DNI)

Direct Normal Irradiance: The total amount of solar radiation received per unit area by a surface that is always perpendicular to the sun rays that come in a straight line from the direction of the sun at its current position in the sky.

Average Tilt at Latitude (ATaL)

Average Tilt at Latitude: The total amount of solar radiation received per unit area by a surface that is tilted toward the equator at an angle equal to the current latitude. ATaL will often produce the optimum energy output.

Solar Radiation Levels in 94028

Solar Radiation Data in 94028

See the chart below for monthly solar radiation levels in 94028.

Sorry, data is not currently available.

Solar Radiation Analysis for 94028

Sorry, it is not possible to complete our solar radiation analysis for 94028 at this time.

Historical solar radiation data for 94028 is not currently available.

Please check back later.

Solar Power Comparison: 94028 vs. the U.S.

Solar Power Levels in 94028

Sorry, solar radiation data for 94028 is not currently available.

Solar Power: 94028 vs. the U.S.

Below is a month-by-month comparison of how average 94028 solar radiation levels compare to average levels in a city with historcially high levels (NV) and a city with historically low levels (WA). ^[1]

Sorry, solar radiation data for California is not currently available.

Solar Data & Statistics for 94028

Sunrise / Sunset in 94028

Sunrise/Sunset for August 24, 2026 ^[2]
- Sunrise: 6:31 am
- Sunset: 7:50 pm
- Length of Day: 13:19

Best Months for Solar in 94028

Monthly data not currently available.

Solar Panel Installs in 94028

We do not have data on solar panel installations in ZIP Code 94028 at the current time.

Solar Power Output in 94028

The Power of Solar in 94028

Monthly AC solar system output averages for 94028. Month-by-month solar power, as ranked by AC output, in 94028. ^[2]

AC output data is not currently available.

Solar Output Analysis for 94028

Sorry, it is not possible to complete our solar radiation analysis for 94028 at this time.

Historical solar radiation data for 94028 is not currently available.

Please check back later.

Weather Forecast for 94028 ^[5]

Mon Aug 24

84°F

Light Rain
Min: 58°F
Max: 87°F

Light breeze: 6 mps W
Precip.: Chance of Rain
Humidity: 30%
Cloud cover: 0%

Tue Aug 25

83°F

Overcast Clouds
Min: 57°F
Max: 86°F

Light breeze: 7 mps NW
Precip.: n/a
Humidity: 30%
Cloud cover: 99%

Wed Aug 26

85°F

Broken Clouds
Min: 58°F
Max: 85°F

Light breeze: 7 mps WNW
Precip.: n/a
Humidity: 23%
Cloud cover: 62%

Thu Aug 27

84°F

Sky Is Clear
Min: 55°F
Max: 84°F

Light breeze: 7 mps WNW
Precip.: n/a
Humidity: 29%
Cloud cover: 0%

Fri Aug 28

79°F

Sky Is Clear
Min: 54°F
Max: 79°F

Light breeze: 7 mps WNW
Precip.: n/a
Humidity: 30%
Cloud cover: 4%

Sat Aug 29

72°F

Sky Is Clear
Min: 53°F
Max: 72°F

Light breeze: 7 mps W
Precip.: n/a
Humidity: 45%
Cloud cover: 0%

More about 94028

About 94028

The ZIP code 94028 is associated with the city of Portola Valley in San Mateo County in California.

94028 Solar Energy & Power

To learn more about solar energy and solar power in 94028, or for more solar-related resources for CA, check out the U.S. Energy Information Administration.