Tools / 09

Solar
Forecast

What your panels should make over the next seven days, from the weather forecast for your own roof.

Open-Meteo forecast · refreshes hourly
Your roof

Showing an example roof in Hampshire. Enter your postcode for yours.

Roof faces

6.02 kWp

Add each direction your panels face. Not sure of the kWp? Enter how many panels and their wattage.

Roof pitch

The angle of the panels from flat.

5.0 kW
1 kW15 kW
Today
—kWh

Loading the forecast…

Peak
—kW
Sunniest window
—
Best this week
—
The next 7 days · kWh · tap a day
Hour by hour

Assumptions
Weather
Open-Meteo hourly forecast
Panel losses
10%, plus heat
Inverter efficiency
97%
Shading
None
Location
Rounded to about 1 km
How this is calculated
  1. 1Your postcode becomes a rough location, via postcodes.io. Nothing is stored.
  2. 2Open-Meteo forecasts the sunlight on each roof face, at its pitch and direction, hour by hour.
  3. 3Each face’s kWp turns that into power, less losses and heat, capped at your inverter.
Forecasts, in one line each
  • TomorrowUsually within about 15 to 25% on a settled day.
  • Days 4 to 7A rough guide only, which is why they’re paler.
  • Broken cloudThe hardest to call. Real days can spike above or dip below the curve.
Check your inverter clipping →