Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 43.4 kWh from the 10 kWp reference system, with a likely range of 34.1 kWh–49.4 kWh. It changes with the next weather forecast.
Austria · 10 kWp reference system
Vienna solar forecast and PV yield
Photo: Superbass,CC BY-SA 3.0. Cropped, resized and converted to WebP by GridPassport.
Forecast target: . Any “tomorrow” label on this page refers to this dated target.
- Tomorrow's forecast
- 43.4 kWh 10 kWp reference system
- Typical annual output
- 11,743 kWh 10 kWp reference system
- Typical specific yield
- 1,174 kWh/kWp Per year
Tuesday, September 1, 2026
About 43.4 kWh tomorrow
For a standard 10 kWp south-facing system in Vienna, GridPassport estimates 43.4 kWh on Tuesday, September 1, 2026, with a likely range of 34.1-49.4 kWh. The strongest production window is expected at 09:00-13:00 local time.
Updated Aug 31, 2026, 01:01 AM GMT+2 · fresh snapshot- Likely range
- 34.1-49.4 kWh
- Strongest window
- 09:00-13:00
- Confidence
- medium
How to read and use the data
Vienna 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
Vienna's PVGIS specific yield is about 1,174 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)13.0 kWh10.2 kWh–14.8 kWhPVGIS typical year3,523 kWh/year
5 kWpTomorrow estimate (likely range)21.7 kWh17.1 kWh–24.7 kWhPVGIS typical year5,872 kWh/year
10 kWpTomorrow estimate (likely range)43.4 kWh34.1 kWh–49.4 kWhPVGIS typical year11,743 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 09:00-13:00 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 21.7 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 09:00-13:00. Never override frost protection, hygiene cycles or manufacturer limits.
Large loads
Avoid stacking appliances
A 3 kWp system scales to about 13.0 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 Vienna?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 21.7 kWh for Tuesday, September 1, 2026, with a scaled likely range of 17.1 kWh–24.7 kWh. This is a linear reference-system estimate, not a site survey.
What does 1,174 kWh/kWp mean for Vienna?
It means the PVGIS multi-year profile produces about 1,174 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 5,872 kWh in a typical year before site-specific adjustments.
Is the Vienna 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 Vienna?
Start with 09:00-13:00, 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 Vienna
A standard 10 kWp system produces about 11,743 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
479Jan
691Feb
1058Mar
1289Apr
1315May
1350Jun
1400Jul
1302Aug
1126Sep
829Oct
483Nov
420Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Vienna's solar profile different?The typical annual yield is about 1,174 kWh per installed kWp, ranking Vienna #4 of 6 modelled locations in Austria. That is 2% below the median of the 6 Austria locations in this dataset. July is typically the strongest month and December the weakest; the stronger month produces about 3.3 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output479 kWhDaily average15.5 kWh/dayYear-to-year variation±92 kWh
MonthFebruaryMonthly output691 kWhDaily average24.7 kWh/dayYear-to-year variation±132 kWh
MonthMarchMonthly output1,058 kWhDaily average34.1 kWh/dayYear-to-year variation±168 kWh
MonthAprilMonthly output1,289 kWhDaily average43.0 kWh/dayYear-to-year variation±165 kWh
MonthMayMonthly output1,315 kWhDaily average42.4 kWh/dayYear-to-year variation±161 kWh
MonthJuneMonthly output1,350 kWhDaily average45.0 kWh/dayYear-to-year variation±137 kWh
MonthJulyMonthly output1,400 kWhDaily average45.2 kWh/dayYear-to-year variation±129 kWh
MonthAugustMonthly output1,302 kWhDaily average42.0 kWh/dayYear-to-year variation±110 kWh
MonthSeptemberMonthly output1,126 kWhDaily average37.5 kWh/dayYear-to-year variation±131 kWh
MonthOctoberMonthly output829 kWhDaily average26.8 kWh/dayYear-to-year variation±160 kWh
MonthNovemberMonthly output483 kWhDaily average16.1 kWh/dayYear-to-year variation±72 kWh
MonthDecemberMonthly output420 kWhDaily average13.5 kWh/dayYear-to-year variation±62 kWh
Nearby solar forecasts
Compare Vienna with nearby cities
Tomorrow, in one email
Get Vienna'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.