Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 47.5 kWh from the 10 kWp reference system, with a likely range of 38.2 kWh–53.1 kWh. It changes with the next weather forecast.
Portugal · 10 kWp reference system
Coimbra solar forecast and PV yield
Photo: Leandro Neumann Ciuffo,CC BY 2.0. Cropped, resized and converted to WebP by GridPassport.
Forecast target: . Any “tomorrow” label on this page refers to this dated target.
- Tomorrow's forecast
- 47.5 kWh 10 kWp reference system
- Typical annual output
- 14,621 kWh 10 kWp reference system
- Typical specific yield
- 1,462 kWh/kWp Per year
Tuesday, September 1, 2026
About 47.5 kWh tomorrow
For a standard 10 kWp south-facing system in Coimbra, GridPassport estimates 47.5 kWh on Tuesday, September 1, 2026, with a likely range of 38.2-53.1 kWh. The strongest production window is expected at 13:00-17:00 local time.
Updated Aug 31, 2026, 12:01 AM GMT+1 · fresh snapshot- Likely range
- 38.2-53.1 kWh
- Strongest window
- 13:00-17:00
- Confidence
- medium
How to read and use the data
Coimbra solar forecast: daily weather versus long-term PV yield
The daily and annual figures answer different questions. Use the dated forecast to plan tomorrow, and the PVGIS specific yield to compare locations or estimate a typical year.
Multi-year climate baseline
PVGIS specific yield
Coimbra's PVGIS specific yield is about 1,462 kWh/kWp per year. It is a multi-year climate benchmark, not a prediction for tomorrow or for this calendar year. In the PVGIS profile, July is typically the strongest month and December the weakest.
3, 5 and 10 kWp reference systems
Scale the same assumptions to your system size
SystemTomorrow estimate (likely range)PVGIS typical year
3 kWpTomorrow estimate (likely range)14.3 kWh11.5 kWh–15.9 kWhPVGIS typical year4,386 kWh/year
5 kWpTomorrow estimate (likely range)23.8 kWh19.1 kWh–26.6 kWhPVGIS typical year7,311 kWh/year
10 kWpTomorrow estimate (likely range)47.5 kWh38.2 kWh–53.1 kWhPVGIS typical year14,621 kWh/year
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
Battery, EV, heat pump and flexible loads
Treat the forecast as a gross solar-energy budget before household base load and conversion losses. The numbers support scheduling; they do not guarantee surplus.
Battery
Keep room for the solar window
Use 13:00-17:00 as the first candidate charging window. Battery state of charge, reserve settings and inverter limits still decide how much can be stored.
EV
Compare the charge with the 5 kWp budget
The scaled 5 kWp estimate is 23.8 kWh before household use. Compare the remainder after base load with the planned EV charge and stagger charging if needed.
Heat pump
Shift only flexible thermal demand
If comfort controls allow it, place discretionary hot-water heating or pre-heating inside 13:00-17:00. Never override frost protection, hygiene cycles or manufacturer limits.
Large loads
Avoid stacking appliances
A 3 kWp system scales to about 14.3 kWh for the day before household use. Run flexible loads sequentially during the strongest hours rather than assuming all forecast energy is simultaneous power.
Local questions
Solar forecast FAQ
How much could a 5 kWp solar system produce tomorrow in Coimbra?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 23.8 kWh for Tuesday, September 1, 2026, with a scaled likely range of 19.1 kWh–26.6 kWh. This is a linear reference-system estimate, not a site survey.
What does 1,462 kWh/kWp mean for Coimbra?
It means the PVGIS multi-year profile produces about 1,462 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 7,311 kWh in a typical year before site-specific adjustments.
Is the Coimbra forecast the same as the PVGIS annual estimate?
No. Tomorrow's forecast uses dated weather and an uncertainty band for one day. The PVGIS figure is a multi-year climate-based specific yield used for typical monthly and annual comparisons.
When should a battery, EV or heat pump use solar in Coimbra?
Start with 13:00-17:00, then check household base load, battery headroom, EV energy required and heat-pump safety or comfort constraints. The forecast estimates daily energy, not guaranteed instantaneous surplus.
Typical year
Solar production month by month in Coimbra
A standard 10 kWp system produces about 14,621 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
927Jan
1014Feb
1212Mar
1271Apr
1433May
1386Jun
1575Jul
1563Aug
1373Sep
1117Oct
877Nov
874Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Coimbra's solar profile different?The typical annual yield is about 1,462 kWh per installed kWp, ranking Coimbra #5 of 6 modelled locations in Portugal. That is 3% below the median of the 6 Portugal locations in this dataset. July is typically the strongest month and December the weakest; the stronger month produces about 1.8 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output927 kWhDaily average29.9 kWh/dayYear-to-year variation±207 kWh
MonthFebruaryMonthly output1,014 kWhDaily average36.2 kWh/dayYear-to-year variation±201 kWh
MonthMarchMonthly output1,212 kWhDaily average39.1 kWh/dayYear-to-year variation±185 kWh
MonthAprilMonthly output1,271 kWhDaily average42.4 kWh/dayYear-to-year variation±168 kWh
MonthMayMonthly output1,433 kWhDaily average46.2 kWh/dayYear-to-year variation±151 kWh
MonthJuneMonthly output1,386 kWhDaily average46.2 kWh/dayYear-to-year variation±118 kWh
MonthJulyMonthly output1,575 kWhDaily average50.8 kWh/dayYear-to-year variation±108 kWh
MonthAugustMonthly output1,563 kWhDaily average50.4 kWh/dayYear-to-year variation±72 kWh
MonthSeptemberMonthly output1,373 kWhDaily average45.8 kWh/dayYear-to-year variation±117 kWh
MonthOctoberMonthly output1,117 kWhDaily average36.0 kWh/dayYear-to-year variation±144 kWh
MonthNovemberMonthly output877 kWhDaily average29.2 kWh/dayYear-to-year variation±191 kWh
MonthDecemberMonthly output874 kWhDaily average28.2 kWh/dayYear-to-year variation±133 kWh
Nearby solar forecasts
Compare Coimbra with nearby cities
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Tomorrow, in one email
Get Coimbra's solar forecast by email
Tomorrow's expected production, likely range and strongest hours. One useful email each day.
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.
CSV and JSON snapshots are published under CC BY 4.0 with source attribution.