Across 6 modelled locations in Portugal, a standard 10 kWp south-facing system produces about 15,338 kWh in a typical year on average. Tomorrow's weather-based city forecasts range from 47.5 to 57.7 kWh for the same reference setup.
Forecast for Tuesday, September 1, 2026 · Updated Aug 30, 2026, 11:01 PM UTC · City samples, not a national production forecast
Forecast target: . Any “tomorrow” label on this page refers to this dated target.
Tomorrow in Portugal
Using the same installation in every location isolates the effect of weather and geography. Enter your own roof on any city page for a personal estimate.
How to read and use the data
This page compares 6 modelled locations on one reference system. It is a city comparison tool, not a measurement or forecast of national solar generation.
Dated, weather-based
For Tuesday, September 1, 2026, the 10 kWp city estimates average 52.9 kWh and span 47.5 kWh–57.7 kWh. That span is geographic variation between modelled cities, not an uncertainty interval or national forecast.
Multi-year climate baseline
The modelled cities average about 1,534 kWh/kWp in the PVGIS typical-year profile. Across the 10 kWp reference systems, typical annual output ranges from 14,028 to 17,465 kWh. July has the highest modelled average monthly output and December the lowest.
3, 5 and 10 kWp reference systems
Linear reference scaling only: south-facing, 35° tilt and 14% system losses. It does not resize inverter clipping, shade or local roof constraints.
From forecast to a household plan
Choose the nearest representative city before scheduling equipment. A country average can frame the day, but a local forecast and the home's own demand determine usable surplus.
Battery
Open the closest city profile and preserve battery headroom around its strongest forecast window. The 47.5 kWh–57.7 kWh country spread shows why one national schedule would be unreliable.
EV
The 5 kWp country-average reference is 26.4 kWh before household use, but select a city because local estimates span 23.8 kWh–28.9 kWh.
Heat pump
Shift only discretionary water heating or pre-heating after checking the nearest city's strongest hours. Comfort, frost protection and hygiene controls take priority.
Large loads
Country figures are daily energy, not simultaneous power. Use a city forecast and run flexible loads sequentially after allowing for base household consumption.
Local questions
Across the 6 modelled locations, the 5 kWp estimates average 26.4 kWh for Tuesday, September 1, 2026 and span 23.8 kWh–28.9 kWh between cities. The spread is geographic, not a national uncertainty range.
Faro has the highest and Braga the lowest typical annual output among the 6 locations in this dataset. The comparison uses the same 10 kWp reference system and PVGIS climate profile.
No. It is the minimum-to-maximum spread across 6 modelled city reference points. It does not aggregate installed solar systems, represent every local weather condition or provide a national generation total.
Select the nearest city and use its strongest forecast hours, then subtract household base load and respect battery, charger and heat-pump operating limits. Use the country page to compare locations, not to control equipment directly.
Representative locations
Typical year
The bars average the 6 city reference points. Typical annual output ranges from about 14,028 to 17,465 kWh for the 10 kWp setup. Of the locations modelled, Faro has the highest typical annual output and Braga the lowest.
Typical monthly profiles use the European Commission JRC PVGIS multi-year climate series.
Local profiles
Download the country snapshot or inspect the assumptions, sources and refresh rules. Static CSV and JSON files are CC BY 4.0 with source attribution.
Tomorrow, in one email
A practical daily solar brief for the reference location in Portugal: expected production, likely range and strongest hours.
