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Poland · 10 kWp reference system

Katowice solar forecast

Photo: Rhododendrites, CC BY-SA 4.0. Cropped, resized and converted to WebP by GridPassport.

Wednesday, August 5, 2026

About 53.1 kWh tomorrow

For a standard 10 kWp south-facing system in Katowice, GridPassport estimates 53.1 kWh on Wednesday, August 5, 2026, with a likely range of 46.5-55.1 kWh. The strongest production window is expected at 11:00-15:00 local time.

Updated Aug 4, 2026, 08:53 PM GMT+2 · fresh snapshot
Likely range
46.5-55.1 kWh
Strongest window
11:00-15:00
Confidence
high
Forecast my solar output

Typical year

Solar production month by month in Katowice

A standard 10 kWp system produces about 10,629 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 Katowice's solar profile different? The typical annual yield is about 1,063 kWh per installed kWp, ranking Katowice #4 of 10 modelled locations in Poland. That is close to the median of the 10 Poland locations in this dataset. July is typically the strongest month and December the weakest; the stronger month produces about 3.7 times as much.

See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuary Monthly output406 kWh Daily average13.1 kWh/day Year-to-year variation±102 kWh
MonthFebruary Monthly output554 kWh Daily average19.8 kWh/day Year-to-year variation±113 kWh
MonthMarch Monthly output930 kWh Daily average30.0 kWh/day Year-to-year variation±176 kWh
MonthApril Monthly output1,146 kWh Daily average38.2 kWh/day Year-to-year variation±189 kWh
MonthMay Monthly output1,204 kWh Daily average38.8 kWh/day Year-to-year variation±195 kWh
MonthJune Monthly output1,254 kWh Daily average41.8 kWh/day Year-to-year variation±166 kWh
MonthJuly Monthly output1,301 kWh Daily average42.0 kWh/day Year-to-year variation±140 kWh
MonthAugust Monthly output1,224 kWh Daily average39.5 kWh/day Year-to-year variation±122 kWh
MonthSeptember Monthly output1,014 kWh Daily average33.8 kWh/day Year-to-year variation±158 kWh
MonthOctober Monthly output790 kWh Daily average25.5 kWh/day Year-to-year variation±168 kWh
MonthNovember Monthly output456 kWh Daily average15.2 kWh/day Year-to-year variation±89 kWh
MonthDecember Monthly output352 kWh Daily average11.3 kWh/day Year-to-year variation±87 kWh

Nearby solar forecasts

Compare Katowice with nearby cities

KrakówPoland 50.9 kWh OstravaCzechia 53.9 kWh ŽilinaSlovakia 54.5 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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