Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 50.9 kWh from the 10 kWp reference system, with a likely range of 36.4 kWh–56.1 kWh. It changes with the next weather forecast.
Spain · 10 kWp reference system
Bilbao solar forecast and PV yield
Photo: Tommie Hansen , Ardfern , Tomas Fano , 0Igor González Martín , Jesús Ignacio Bravo Soler , Pedro J Pacheco , Irekia/Gobierno Vasco, Euskaldunaa , Basotxerri , Eric Fischer , Tiia Monto , pictures Jettcom y Zarateman,CC BY-SA 4.0. Cropped, resized and converted to WebP by GridPassport.
Forecast target: . Any “tomorrow” label on this page refers to this dated target.
- Tomorrow's forecast
- 50.9 kWh 10 kWp reference system
- Typical annual output
- 11,668 kWh 10 kWp reference system
- Typical specific yield
- 1,167 kWh/kWp Per year
Tuesday, September 1, 2026
About 50.9 kWh tomorrow
For a standard 10 kWp south-facing system in Bilbao, GridPassport estimates 50.9 kWh on Tuesday, September 1, 2026, with a likely range of 36.4-56.1 kWh. The strongest production window is expected at 12:00-16:00 local time.
Updated Aug 31, 2026, 01:01 AM GMT+2 · fresh snapshot- Likely range
- 36.4-56.1 kWh
- Strongest window
- 12:00-16:00
- Confidence
- medium
How to read and use the data
Bilbao 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
Bilbao's PVGIS specific yield is about 1,167 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 January 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)15.3 kWh10.9 kWh–16.8 kWhPVGIS typical year3,500 kWh/year
5 kWpTomorrow estimate (likely range)25.4 kWh18.2 kWh–28.1 kWhPVGIS typical year5,834 kWh/year
10 kWpTomorrow estimate (likely range)50.9 kWh36.4 kWh–56.1 kWhPVGIS typical year11,668 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 12:00-16:00 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 25.4 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 12:00-16:00. Never override frost protection, hygiene cycles or manufacturer limits.
Large loads
Avoid stacking appliances
A 3 kWp system scales to about 15.3 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 Bilbao?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 25.4 kWh for Tuesday, September 1, 2026, with a scaled likely range of 18.2 kWh–28.1 kWh. This is a linear reference-system estimate, not a site survey.
What does 1,167 kWh/kWp mean for Bilbao?
It means the PVGIS multi-year profile produces about 1,167 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 5,834 kWh in a typical year before site-specific adjustments.
Is the Bilbao 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 Bilbao?
Start with 12:00-16:00, 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 Bilbao
A standard 10 kWp system produces about 11,668 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
618Jan
759Feb
1017Mar
1106Apr
1216May
1153Jun
1230Jul
1217Aug
1135Sep
945Oct
648Nov
623Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Bilbao's solar profile different?The typical annual yield is about 1,167 kWh per installed kWp, ranking Bilbao #10 of 10 modelled locations in Spain. That is 28% below the median of the 10 Spain locations in this dataset. July is typically the strongest month and January the weakest; the stronger month produces about 2.0 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output618 kWhDaily average19.9 kWh/dayYear-to-year variation±117 kWh
MonthFebruaryMonthly output759 kWhDaily average27.1 kWh/dayYear-to-year variation±157 kWh
MonthMarchMonthly output1,017 kWhDaily average32.8 kWh/dayYear-to-year variation±164 kWh
MonthAprilMonthly output1,106 kWhDaily average36.9 kWh/dayYear-to-year variation±143 kWh
MonthMayMonthly output1,216 kWhDaily average39.2 kWh/dayYear-to-year variation±129 kWh
MonthJuneMonthly output1,153 kWhDaily average38.4 kWh/dayYear-to-year variation±88 kWh
MonthJulyMonthly output1,230 kWhDaily average39.7 kWh/dayYear-to-year variation±94 kWh
MonthAugustMonthly output1,217 kWhDaily average39.3 kWh/dayYear-to-year variation±73 kWh
MonthSeptemberMonthly output1,135 kWhDaily average37.8 kWh/dayYear-to-year variation±71 kWh
MonthOctoberMonthly output945 kWhDaily average30.5 kWh/dayYear-to-year variation±101 kWh
MonthNovemberMonthly output648 kWhDaily average21.6 kWh/dayYear-to-year variation±139 kWh
MonthDecemberMonthly output623 kWhDaily average20.1 kWh/dayYear-to-year variation±116 kWh
Nearby solar forecasts
Compare Bilbao with nearby cities
Tomorrow, in one email
Get Bilbao'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.