Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 33.1 kWh from the 10 kWp reference system, with a likely range of 23.1 kWh–42.4 kWh. It changes with the next weather forecast.
Austria · 10 kWp reference system
Graz solar forecast and PV yield
Photo: Nick Savchenko from Kiev, Ukraine,CC BY-SA 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
- 33.1 kWh 10 kWp reference system
- Typical annual output
- 12,217 kWh 10 kWp reference system
- Typical specific yield
- 1,222 kWh/kWp Per year
Tuesday, September 1, 2026
About 33.1 kWh tomorrow
For a standard 10 kWp south-facing system in Graz, GridPassport estimates 33.1 kWh on Tuesday, September 1, 2026, with a likely range of 23.1-42.4 kWh. The strongest production window is expected at 11:00-15:00 local time.
Updated Aug 31, 2026, 01:01 AM GMT+2 · fresh snapshot- Likely range
- 23.1-42.4 kWh
- Strongest window
- 11:00-15:00
- Confidence
- medium
How to read and use the data
Graz 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
Graz's PVGIS specific yield is about 1,222 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)9.9 kWh6.9 kWh–12.7 kWhPVGIS typical year3,665 kWh/year
5 kWpTomorrow estimate (likely range)16.6 kWh11.6 kWh–21.2 kWhPVGIS typical year6,108 kWh/year
10 kWpTomorrow estimate (likely range)33.1 kWh23.1 kWh–42.4 kWhPVGIS typical year12,217 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 11:00-15:00 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 16.6 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 11:00-15:00. Never override frost protection, hygiene cycles or manufacturer limits.
Large loads
Avoid stacking appliances
A 3 kWp system scales to about 9.9 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 Graz?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 16.6 kWh for Tuesday, September 1, 2026, with a scaled likely range of 11.6 kWh–21.2 kWh. This is a linear reference-system estimate, not a site survey.
What does 1,222 kWh/kWp mean for Graz?
It means the PVGIS multi-year profile produces about 1,222 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 6,108 kWh in a typical year before site-specific adjustments.
Is the Graz 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 Graz?
Start with 11:00-15:00, 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 Graz
A standard 10 kWp system produces about 12,217 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
678Jan
804Feb
1126Mar
1225Apr
1255May
1286Jun
1364Jul
1283Aug
1103Sep
934Oct
595Nov
565Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Graz's solar profile different?The typical annual yield is about 1,222 kWh per installed kWp, ranking Graz #3 of 6 modelled locations in Austria. That is 2% above 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 2.4 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output678 kWhDaily average21.9 kWh/dayYear-to-year variation±170 kWh
MonthFebruaryMonthly output804 kWhDaily average28.7 kWh/dayYear-to-year variation±212 kWh
MonthMarchMonthly output1,126 kWhDaily average36.3 kWh/dayYear-to-year variation±176 kWh
MonthAprilMonthly output1,225 kWhDaily average40.8 kWh/dayYear-to-year variation±150 kWh
MonthMayMonthly output1,255 kWhDaily average40.5 kWh/dayYear-to-year variation±129 kWh
MonthJuneMonthly output1,286 kWhDaily average42.9 kWh/dayYear-to-year variation±95 kWh
MonthJulyMonthly output1,364 kWhDaily average44.0 kWh/dayYear-to-year variation±107 kWh
MonthAugustMonthly output1,283 kWhDaily average41.4 kWh/dayYear-to-year variation±126 kWh
MonthSeptemberMonthly output1,103 kWhDaily average36.8 kWh/dayYear-to-year variation±141 kWh
MonthOctoberMonthly output934 kWhDaily average30.1 kWh/dayYear-to-year variation±122 kWh
MonthNovemberMonthly output595 kWhDaily average19.8 kWh/dayYear-to-year variation±131 kWh
MonthDecemberMonthly output565 kWhDaily average18.2 kWh/dayYear-to-year variation±94 kWh
Nearby solar forecasts
Compare Graz with nearby cities
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Tomorrow, in one email
Get Graz'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.