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Suomenlinna , a fortress near Helsinki , Finland . Picture taken from a ferry.

Finland · 10 kWp reference system

Helsinki solar forecast

Photo: Michal Pise, Michal.Pise, CC BY 2.0. Cropped, resized and converted to WebP by GridPassport.

Wednesday, August 5, 2026

About 41.4 kWh tomorrow

For a standard 10 kWp south-facing system in Helsinki, GridPassport estimates 41.4 kWh on Wednesday, August 5, 2026, with a likely range of 29.5-51.9 kWh. The strongest production window is expected at 13:00-17:00 local time.

Updated Aug 4, 2026, 09:53 PM GMT+3 · fresh snapshot
Likely range
29.5-51.9 kWh
Strongest window
13:00-17:00
Confidence
medium
Forecast my solar output

Typical year

Solar production month by month in Helsinki

A standard 10 kWp system produces about 9,667 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 Helsinki's solar profile different? The typical annual yield is about 967 kWh per installed kWp, ranking Helsinki #1 of 6 modelled locations in Finland. That is 10% above the median of the 6 Finland locations in this dataset. May is typically the strongest month and December the weakest; the stronger month produces about 15.5 times as much.

See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuary Monthly output140 kWh Daily average4.5 kWh/day Year-to-year variation±44 kWh
MonthFebruary Monthly output322 kWh Daily average11.5 kWh/day Year-to-year variation±81 kWh
MonthMarch Monthly output855 kWh Daily average27.6 kWh/day Year-to-year variation±157 kWh
MonthApril Monthly output1,176 kWh Daily average39.2 kWh/day Year-to-year variation±157 kWh
MonthMay Monthly output1,491 kWh Daily average48.1 kWh/day Year-to-year variation±162 kWh
MonthJune Monthly output1,474 kWh Daily average49.1 kWh/day Year-to-year variation±145 kWh
MonthJuly Monthly output1,483 kWh Daily average47.8 kWh/day Year-to-year variation±109 kWh
MonthAugust Monthly output1,216 kWh Daily average39.2 kWh/day Year-to-year variation±158 kWh
MonthSeptember Monthly output816 kWh Daily average27.2 kWh/day Year-to-year variation±112 kWh
MonthOctober Monthly output451 kWh Daily average14.6 kWh/day Year-to-year variation±107 kWh
MonthNovember Monthly output148 kWh Daily average4.9 kWh/day Year-to-year variation±46 kWh
MonthDecember Monthly output96 kWh Daily average3.1 kWh/day Year-to-year variation±30 kWh

Nearby solar forecasts

Compare Helsinki with nearby cities

TallinnEstonia 55.2 kWh TurkuFinland 20.0 kWh TampereFinland 5.3 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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