Solar Energy & Solar Power Resources

Solar Power in 94581 (Napa, CA)

Solar Energy in 94581

Sorry, historical solar radition values for 94581 are currently unavailable, please check back later.

Solar Panels in 94581

Solar panels in 94581 that will produce the maximum solar energy output. [More]

Sunrise & Sunset in 94581

The total length of the day in 94581 (Napa, CA) today (September 18, 2025) will be 12 hours and 21 minutes. [More]

Solar Energy in 94581 (Napa, CA)

Solar Energy Data for 94581

See the chart below to see how different types of solar panel installations compare in 94581.

Historical solar power output data for Napa is not currently available.

Solar Energy Analysis for 94581

Sorry, it is not possible to complete our solar energy analysis for 94581 at this time.

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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 94581

Solar Radiation Data in 94581

See the chart below for monthly solar radiation levels in 94581.

Sorry, data is not currently available.

Solar Radiation Analysis for 94581

Sorry, it is not possible to complete our solar radiation analysis for 94581 at this time.

Historical solar radiation data for 94581 is not currently available.

Please check back later.

Solar Power Comparison: 94581 vs. the U.S.

Solar Power Levels in 94581

Sorry, solar radiation data for 94581 is not currently available.

Solar Power: 94581 vs. the U.S.

Below is a month-by-month comparison of how average 94581 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 94581

Sunrise / Sunset in 94581

Sunrise/Sunset for September 18, 2025 ^[2]
- Sunrise: 6:52 am
- Sunset: 7:13 pm
- Length of Day: 12:21

Best Months for Solar in 94581

Monthly data not currently available.

Solar Panel Installs in 94581

We do not have data on solar panel installations in ZIP Code 94581 at the current time.

Solar Power Output in 94581

The Power of Solar in 94581

Monthly AC solar system output averages for 94581. Month-by-month solar power, as ranked by AC output, in 94581. ^[2]

AC output data is not currently available.

Solar Output Analysis for 94581

Sorry, it is not possible to complete our solar radiation analysis for 94581 at this time.

Historical solar radiation data for 94581 is not currently available.

Please check back later.

Weather Forecast for 94581 ^[5]

Thu Sep 18

77°F

Light Rain
Min: 58°F
Max: 77°F

Gentle Breeze: 8 mps S
Precip.: Chance of Rain
Humidity: 36%
Cloud cover: 96%

Fri Sep 19

80°F

Few Clouds
Min: 58°F
Max: 82°F

Light breeze: 6 mps S
Precip.: n/a
Humidity: 38%
Cloud cover: 12%

Sat Sep 20

86°F

Sky Is Clear
Min: 58°F
Max: 87°F

Gentle Breeze: 9 mps SW
Precip.: n/a
Humidity: 32%
Cloud cover: 5%

Sun Sep 21

88°F

Sky Is Clear
Min: 59°F
Max: 88°F

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

Mon Sep 22

95°F

Sky Is Clear
Min: 61°F
Max: 95°F

Light breeze: 7 mps SW
Precip.: n/a
Humidity: 19%
Cloud cover: 0%

Tue Sep 23

76°F

Light Rain
Min: 64°F
Max: 76°F

Light breeze: 6 mps E
Precip.: Chance of Rain
Humidity: 50%
Cloud cover: 100%

More about 94581

About 94581

The ZIP code 94581 is associated with the city of Napa in Napa County in California.

94581 Solar Energy & Power

To learn more about solar energy and solar power in 94581, or for more solar-related resources for CA, check out the U.S. Energy Information Administration.