Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 35.8 kWh from the 10 kWp reference system, with a likely range of 25.2 kWh–46.0 kWh. It changes with the next weather forecast.
Finland · 10 kWp reference system
Turku solar forecast and PV yield
Photo: Markus Koljonen ( Dilaudid ) with thanks to Jontts and Turku Cathedral,CC BY-SA 3.0. Cropped, resized and converted to WebP by GridPassport.
Forecast target: . Any “tomorrow” label on this page refers to this dated target.
- Tomorrow's forecast
- 35.8 kWh 10 kWp reference system
- Typical annual output
- 9,556 kWh 10 kWp reference system
- Typical specific yield
- 956 kWh/kWp Per year
Tuesday, September 1, 2026
About 35.8 kWh tomorrow
For a standard 10 kWp south-facing system in Turku, GridPassport estimates 35.8 kWh on Tuesday, September 1, 2026, with a likely range of 25.2-46.0 kWh. The strongest production window is expected at 13:00-17:00 local time.
Updated Aug 31, 2026, 02:01 AM GMT+3 · fresh snapshot- Likely range
- 25.2-46.0 kWh
- Strongest window
- 13:00-17:00
- Confidence
- medium
How to read and use the data
Turku 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
Turku's PVGIS specific yield is about 956 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)10.7 kWh7.6 kWh–13.8 kWhPVGIS typical year2,867 kWh/year
5 kWpTomorrow estimate (likely range)17.9 kWh12.6 kWh–23.0 kWhPVGIS typical year4,778 kWh/year
10 kWpTomorrow estimate (likely range)35.8 kWh25.2 kWh–46.0 kWhPVGIS typical year9,556 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 13:00-17:00 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 17.9 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 13:00-17:00. Never override frost protection, hygiene cycles or manufacturer limits.
Large loads
Avoid stacking appliances
A 3 kWp system scales to about 10.7 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 Turku?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 17.9 kWh for Tuesday, September 1, 2026, with a scaled likely range of 12.6 kWh–23.0 kWh. This is a linear reference-system estimate, not a site survey.
What does 956 kWh/kWp mean for Turku?
It means the PVGIS multi-year profile produces about 956 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 4,778 kWh in a typical year before site-specific adjustments.
Is the Turku 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 Turku?
Start with 13:00-17:00, 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 Turku
A standard 10 kWp system produces about 9,556 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
145Jan
398Feb
889Mar
1172Apr
1463May
1446Jun
1372Jul
1171Aug
815Sep
457Oct
149Nov
78Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Turku's solar profile different?The typical annual yield is about 956 kWh per installed kWp, ranking Turku #2 of 6 modelled locations in Finland. That is 9% 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 18.7 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output145 kWhDaily average4.7 kWh/dayYear-to-year variation±52 kWh
MonthFebruaryMonthly output398 kWhDaily average14.2 kWh/dayYear-to-year variation±107 kWh
MonthMarchMonthly output889 kWhDaily average28.7 kWh/dayYear-to-year variation±191 kWh
MonthAprilMonthly output1,172 kWhDaily average39.1 kWh/dayYear-to-year variation±157 kWh
MonthMayMonthly output1,463 kWhDaily average47.2 kWh/dayYear-to-year variation±160 kWh
MonthJuneMonthly output1,446 kWhDaily average48.2 kWh/dayYear-to-year variation±155 kWh
MonthJulyMonthly output1,372 kWhDaily average44.3 kWh/dayYear-to-year variation±140 kWh
MonthAugustMonthly output1,171 kWhDaily average37.8 kWh/dayYear-to-year variation±160 kWh
MonthSeptemberMonthly output815 kWhDaily average27.1 kWh/dayYear-to-year variation±99 kWh
MonthOctoberMonthly output457 kWhDaily average14.7 kWh/dayYear-to-year variation±119 kWh
MonthNovemberMonthly output149 kWhDaily average5.0 kWh/dayYear-to-year variation±44 kWh
MonthDecemberMonthly output78 kWhDaily average2.5 kWh/dayYear-to-year variation±21 kWh
Nearby solar forecasts
Compare Turku with nearby cities
Tomorrow, in one email
Get Turku'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.