Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 41.7 kWh from the 10 kWp reference system, with a likely range of 32.8 kWh–49.4 kWh. It changes with the next weather forecast.
Croatia · 10 kWp reference system
Rijeka solar forecast and PV yield
Photo: Antonio199cro,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
- 41.7 kWh 10 kWp reference system
- Typical annual output
- 13,005 kWh 10 kWp reference system
- Typical specific yield
- 1,300 kWh/kWp Per year
Tuesday, September 1, 2026
About 41.7 kWh tomorrow
For a standard 10 kWp south-facing system in Rijeka, GridPassport estimates 41.7 kWh on Tuesday, September 1, 2026, with a likely range of 32.8-49.4 kWh. The strongest production window is expected at 14:00-18:00 local time.
Updated Aug 31, 2026, 01:01 AM GMT+2 · fresh snapshot- Likely range
- 32.8-49.4 kWh
- Strongest window
- 14:00-18:00
- Confidence
- high
How to read and use the data
Rijeka 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
Rijeka's PVGIS specific yield is about 1,300 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)12.5 kWh9.8 kWh–14.8 kWhPVGIS typical year3,901 kWh/year
5 kWpTomorrow estimate (likely range)20.9 kWh16.4 kWh–24.7 kWhPVGIS typical year6,502 kWh/year
10 kWpTomorrow estimate (likely range)41.7 kWh32.8 kWh–49.4 kWhPVGIS typical year13,005 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 14:00-18:00 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 20.9 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 14:00-18:00. Never override frost protection, hygiene cycles or manufacturer limits.
Large loads
Avoid stacking appliances
A 3 kWp system scales to about 12.5 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 Rijeka?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 20.9 kWh for Tuesday, September 1, 2026, with a scaled likely range of 16.4 kWh–24.7 kWh. This is a linear reference-system estimate, not a site survey.
What does 1,300 kWh/kWp mean for Rijeka?
It means the PVGIS multi-year profile produces about 1,300 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 6,502 kWh in a typical year before site-specific adjustments.
Is the Rijeka 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 Rijeka?
Start with 14:00-18:00, 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 Rijeka
A standard 10 kWp system produces about 13,005 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
684Jan
799Feb
1130Mar
1252Apr
1339May
1438Jun
1524Jul
1463Aug
1197Sep
961Oct
618Nov
600Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Rijeka's solar profile different?The typical annual yield is about 1,300 kWh per installed kWp, ranking Rijeka #3 of 5 modelled locations in Croatia. That is close to 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 2.5 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output684 kWhDaily average22.1 kWh/dayYear-to-year variation±182 kWh
MonthFebruaryMonthly output799 kWhDaily average28.5 kWh/dayYear-to-year variation±167 kWh
MonthMarchMonthly output1,130 kWhDaily average36.4 kWh/dayYear-to-year variation±231 kWh
MonthAprilMonthly output1,252 kWhDaily average41.7 kWh/dayYear-to-year variation±164 kWh
MonthMayMonthly output1,339 kWhDaily average43.2 kWh/dayYear-to-year variation±175 kWh
MonthJuneMonthly output1,438 kWhDaily average47.9 kWh/dayYear-to-year variation±92 kWh
MonthJulyMonthly output1,524 kWhDaily average49.1 kWh/dayYear-to-year variation±96 kWh
MonthAugustMonthly output1,463 kWhDaily average47.2 kWh/dayYear-to-year variation±140 kWh
MonthSeptemberMonthly output1,197 kWhDaily average39.9 kWh/dayYear-to-year variation±134 kWh
MonthOctoberMonthly output961 kWhDaily average31.0 kWh/dayYear-to-year variation±115 kWh
MonthNovemberMonthly output618 kWhDaily average20.6 kWh/dayYear-to-year variation±162 kWh
MonthDecemberMonthly output600 kWhDaily average19.4 kWh/dayYear-to-year variation±147 kWh
Nearby solar forecasts
Compare Rijeka with nearby cities
Tomorrow, in one email
Get Rijeka'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.