Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 31.3 kWh from the 10 kWp reference system, with a likely range of 22.5 kWh–39.3 kWh. It changes with the next weather forecast.
Finland · 10 kWp reference system
Helsinki solar forecast and PV yield
Photo: Michal Pise, Michal.Pise,CC BY 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
- 31.3 kWh 10 kWp reference system
- Typical annual output
- 9,667 kWh 10 kWp reference system
- Typical specific yield
- 967 kWh/kWp Per year
Tuesday, September 1, 2026
About 31.3 kWh tomorrow
For a standard 10 kWp south-facing system in Helsinki, GridPassport estimates 31.3 kWh on Tuesday, September 1, 2026, with a likely range of 22.5-39.3 kWh. The strongest production window is expected at 14:00-18:00 local time.
Updated Aug 31, 2026, 02:01 AM GMT+3 · fresh snapshot- Likely range
- 22.5-39.3 kWh
- Strongest window
- 14:00-18:00
- Confidence
- medium
How to read and use the data
Helsinki 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
Helsinki's PVGIS specific yield is about 967 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, May 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)9.4 kWh6.8 kWh–11.8 kWhPVGIS typical year2,900 kWh/year
5 kWpTomorrow estimate (likely range)15.7 kWh11.3 kWh–19.6 kWhPVGIS typical year4,833 kWh/year
10 kWpTomorrow estimate (likely range)31.3 kWh22.5 kWh–39.3 kWhPVGIS typical year9,667 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 15.7 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 9.4 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 Helsinki?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 15.7 kWh for Tuesday, September 1, 2026, with a scaled likely range of 11.3 kWh–19.6 kWh. This is a linear reference-system estimate, not a site survey.
What does 967 kWh/kWp mean for Helsinki?
It means the PVGIS multi-year profile produces about 967 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 4,833 kWh in a typical year before site-specific adjustments.
Is the Helsinki 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 Helsinki?
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 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.
140Jan
322Feb
855Mar
1176Apr
1491May
1474Jun
1483Jul
1216Aug
816Sep
451Oct
148Nov
96Dec
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
MonthJanuaryMonthly output140 kWhDaily average4.5 kWh/dayYear-to-year variation±44 kWh
MonthFebruaryMonthly output322 kWhDaily average11.5 kWh/dayYear-to-year variation±81 kWh
MonthMarchMonthly output855 kWhDaily average27.6 kWh/dayYear-to-year variation±157 kWh
MonthAprilMonthly output1,176 kWhDaily average39.2 kWh/dayYear-to-year variation±157 kWh
MonthMayMonthly output1,491 kWhDaily average48.1 kWh/dayYear-to-year variation±162 kWh
MonthJuneMonthly output1,474 kWhDaily average49.1 kWh/dayYear-to-year variation±145 kWh
MonthJulyMonthly output1,483 kWhDaily average47.8 kWh/dayYear-to-year variation±109 kWh
MonthAugustMonthly output1,216 kWhDaily average39.2 kWh/dayYear-to-year variation±158 kWh
MonthSeptemberMonthly output816 kWhDaily average27.2 kWh/dayYear-to-year variation±112 kWh
MonthOctoberMonthly output451 kWhDaily average14.6 kWh/dayYear-to-year variation±107 kWh
MonthNovemberMonthly output148 kWhDaily average4.9 kWh/dayYear-to-year variation±46 kWh
MonthDecemberMonthly output96 kWhDaily average3.1 kWh/dayYear-to-year variation±30 kWh
Nearby solar forecasts
Compare Helsinki with nearby cities
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Tomorrow, in one email
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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.