Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 45.7 kWh from the 10 kWp reference system, with a likely range of 36.1 kWh–51.2 kWh. It changes with the next weather forecast.
Croatia · 10 kWp reference system
Zagreb 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
- 45.7 kWh 10 kWp reference system
- Typical annual output
- 12,344 kWh 10 kWp reference system
- Typical specific yield
- 1,234 kWh/kWp Per year
Tuesday, September 1, 2026
About 45.7 kWh tomorrow
For a standard 10 kWp south-facing system in Zagreb, GridPassport estimates 45.7 kWh on Tuesday, September 1, 2026, with a likely range of 36.1-51.2 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
- 36.1-51.2 kWh
- Strongest window
- 12:00-16:00
- Confidence
- medium
How to read and use the data
Zagreb 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
Zagreb's PVGIS specific yield is about 1,234 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)13.7 kWh10.8 kWh–15.4 kWhPVGIS typical year3,703 kWh/year
5 kWpTomorrow estimate (likely range)22.9 kWh18.1 kWh–25.6 kWhPVGIS typical year6,172 kWh/year
10 kWpTomorrow estimate (likely range)45.7 kWh36.1 kWh–51.2 kWhPVGIS typical year12,344 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 22.9 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 13.7 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 Zagreb?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 22.9 kWh for Tuesday, September 1, 2026, with a scaled likely range of 18.1 kWh–25.6 kWh. This is a linear reference-system estimate, not a site survey.
What does 1,234 kWh/kWp mean for Zagreb?
It means the PVGIS multi-year profile produces about 1,234 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 6,172 kWh in a typical year before site-specific adjustments.
Is the Zagreb 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 Zagreb?
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 Zagreb
A standard 10 kWp system produces about 12,344 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
588Jan
723Feb
1107Mar
1264Apr
1328May
1411Jun
1464Jul
1399Aug
1140Sep
927Oct
535Nov
456Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Zagreb's solar profile different?The typical annual yield is about 1,234 kWh per installed kWp, ranking Zagreb #5 of 5 modelled locations in Croatia. That is 5% below the median of the 5 Croatia locations in this dataset. July is typically the strongest month and December the weakest; the stronger month produces about 3.2 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output588 kWhDaily average19.0 kWh/dayYear-to-year variation±164 kWh
MonthFebruaryMonthly output723 kWhDaily average25.8 kWh/dayYear-to-year variation±183 kWh
MonthMarchMonthly output1,107 kWhDaily average35.7 kWh/dayYear-to-year variation±194 kWh
MonthAprilMonthly output1,264 kWhDaily average42.1 kWh/dayYear-to-year variation±158 kWh
MonthMayMonthly output1,328 kWhDaily average42.8 kWh/dayYear-to-year variation±155 kWh
MonthJuneMonthly output1,411 kWhDaily average47.0 kWh/dayYear-to-year variation±101 kWh
MonthJulyMonthly output1,464 kWhDaily average47.2 kWh/dayYear-to-year variation±89 kWh
MonthAugustMonthly output1,399 kWhDaily average45.1 kWh/dayYear-to-year variation±152 kWh
MonthSeptemberMonthly output1,140 kWhDaily average38.0 kWh/dayYear-to-year variation±180 kWh
MonthOctoberMonthly output927 kWhDaily average29.9 kWh/dayYear-to-year variation±139 kWh
MonthNovemberMonthly output535 kWhDaily average17.8 kWh/dayYear-to-year variation±114 kWh
MonthDecemberMonthly output456 kWhDaily average14.7 kWh/dayYear-to-year variation±117 kWh
Nearby solar forecasts
Compare Zagreb with nearby cities
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Tomorrow, in one email
Get Zagreb'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.