United Kingdom · 10 kWp reference system
Cardiff solar forecast
Photo: grahamwell / Graham profile at Flickr website, CC BY-SA 2.0. Cropped, resized and converted to WebP by GridPassport.
Wednesday, August 5, 2026
About 36.9 kWh tomorrow
For a standard 10 kWp south-facing system in Cardiff, GridPassport estimates 36.9 kWh on Wednesday, August 5, 2026, with a likely range of 26.7-46.4 kWh. The strongest production window is expected at 14:00-18:00 local time.
Updated Aug 4, 2026, 07:53 PM GMT+1 · fresh snapshot- Likely range
- 26.7-46.4 kWh
- Strongest window
- 14:00-18:00
- Confidence
- medium
Typical year
Solar production month by month in Cardiff
A standard 10 kWp system produces about 10,417 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Cardiff's solar profile different? The typical annual yield is about 1,042 kWh per installed kWp, ranking Cardiff #1 of 12 modelled locations in United Kingdom. That is 10% above the median of the 12 United Kingdom locations in this dataset. May is typically the strongest month and December the weakest; the stronger month produces about 4.1 times as much.
See the 12-month data
Nearby solar forecasts
Compare Cardiff with nearby cities
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Method and data
Every city uses a 10 kWp system facing south at 35 degrees with 14% system losses. Tomorrow's figure combines hourly weather with GridPassport's PV production and uncertainty model. The monthly profile uses the European Commission JRC PVGIS multi-year climate series. Roof direction, shade, snow, dirt, inverter clipping and local weather can change real output.