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Ljubljana Old Town, Slovenia (Old Camera)

Slovenia · 10 kWp reference system

Ljubljana solar forecast

Photo: Andrew Milligan Sumo, CC BY 2.0. Cropped, resized and converted to WebP by GridPassport.

Wednesday, August 5, 2026

About 53.2 kWh tomorrow

For a standard 10 kWp south-facing system in Ljubljana, GridPassport estimates 53.2 kWh on Wednesday, August 5, 2026, with a likely range of 45.5-55.2 kWh. The strongest production window is expected at 12:00-16:00 local time.

Updated Aug 4, 2026, 08:53 PM GMT+2 · fresh snapshot
Likely range
45.5-55.2 kWh
Strongest window
12:00-16:00
Confidence
high
Forecast my solar output

Typical year

Solar production month by month in Ljubljana

A standard 10 kWp system produces about 11,708 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.

Values are kWh per month. Source: European Commission JRC PVGIS.

What makes Ljubljana's solar profile different? The typical annual yield is about 1,171 kWh per installed kWp, ranking Ljubljana #4 of 4 modelled locations in Slovenia. That is 3% below the median of the 4 Slovenia locations in this dataset. July is typically the strongest month and December the weakest; the stronger month produces about 3.6 times as much.

See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuary Monthly output564 kWh Daily average18.2 kWh/day Year-to-year variation±181 kWh
MonthFebruary Monthly output704 kWh Daily average25.1 kWh/day Year-to-year variation±184 kWh
MonthMarch Monthly output1,081 kWh Daily average34.9 kWh/day Year-to-year variation±251 kWh
MonthApril Monthly output1,204 kWh Daily average40.1 kWh/day Year-to-year variation±166 kWh
MonthMay Monthly output1,275 kWh Daily average41.1 kWh/day Year-to-year variation±172 kWh
MonthJune Monthly output1,355 kWh Daily average45.2 kWh/day Year-to-year variation±106 kWh
MonthJuly Monthly output1,442 kWh Daily average46.5 kWh/day Year-to-year variation±99 kWh
MonthAugust Monthly output1,339 kWh Daily average43.2 kWh/day Year-to-year variation±152 kWh
MonthSeptember Monthly output1,088 kWh Daily average36.3 kWh/day Year-to-year variation±164 kWh
MonthOctober Monthly output800 kWh Daily average25.8 kWh/day Year-to-year variation±136 kWh
MonthNovember Monthly output452 kWh Daily average15.1 kWh/day Year-to-year variation±125 kWh
MonthDecember Monthly output403 kWh Daily average13.0 kWh/day Year-to-year variation±116 kWh

Nearby solar forecasts

Compare Ljubljana with nearby cities

CeljeSlovenia 54.3 kWh KlagenfurtAustria 53.0 kWh RijekaCroatia 51.6 kWh

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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.

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