Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 23.1 kWh from the 10 kWp reference system, with a likely range of 14.9 kWh–31.4 kWh. It changes with the next weather forecast.
Latvia · 10 kWp reference system
Riga solar forecast and PV yield
Photo: Jorge Franganillo from Barcelona, Spain,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
- 23.1 kWh 10 kWp reference system
- Typical annual output
- 9,791 kWh 10 kWp reference system
- Typical specific yield
- 979 kWh/kWp Per year
Tuesday, September 1, 2026
About 23.1 kWh tomorrow
For a standard 10 kWp south-facing system in Riga, GridPassport estimates 23.1 kWh on Tuesday, September 1, 2026, with a likely range of 14.9-31.4 kWh. The strongest production window is expected at 10:00-14:00 local time.
Updated Aug 31, 2026, 02:01 AM GMT+3 · fresh snapshot- Likely range
- 14.9-31.4 kWh
- Strongest window
- 10:00-14:00
- Confidence
- medium
How to read and use the data
Riga 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
Riga's PVGIS specific yield is about 979 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)6.9 kWh4.5 kWh–9.4 kWhPVGIS typical year2,937 kWh/year
5 kWpTomorrow estimate (likely range)11.6 kWh7.5 kWh–15.7 kWhPVGIS typical year4,895 kWh/year
10 kWpTomorrow estimate (likely range)23.1 kWh14.9 kWh–31.4 kWhPVGIS typical year9,791 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 10:00-14:00 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 11.6 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 10:00-14:00. Never override frost protection, hygiene cycles or manufacturer limits.
Large loads
Avoid stacking appliances
A 3 kWp system scales to about 6.9 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 Riga?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 11.6 kWh for Tuesday, September 1, 2026, with a scaled likely range of 7.5 kWh–15.7 kWh. This is a linear reference-system estimate, not a site survey.
What does 979 kWh/kWp mean for Riga?
It means the PVGIS multi-year profile produces about 979 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 4,895 kWh in a typical year before site-specific adjustments.
Is the Riga 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 Riga?
Start with 10:00-14:00, 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 Riga
A standard 10 kWp system produces about 9,791 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
226Jan
451Feb
868Mar
1189Apr
1392May
1367Jun
1348Jul
1169Aug
898Sep
549Oct
206Nov
128Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Riga's solar profile different?The typical annual yield is about 979 kWh per installed kWp, ranking Riga #4 of 4 modelled locations in Latvia. That is close to the median of the 4 Latvia locations in this dataset. May is typically the strongest month and December the weakest; the stronger month produces about 10.9 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output226 kWhDaily average7.3 kWh/dayYear-to-year variation±91 kWh
MonthFebruaryMonthly output451 kWhDaily average16.1 kWh/dayYear-to-year variation±132 kWh
MonthMarchMonthly output868 kWhDaily average28.0 kWh/dayYear-to-year variation±204 kWh
MonthAprilMonthly output1,189 kWhDaily average39.6 kWh/dayYear-to-year variation±162 kWh
MonthMayMonthly output1,392 kWhDaily average44.9 kWh/dayYear-to-year variation±183 kWh
MonthJuneMonthly output1,367 kWhDaily average45.5 kWh/dayYear-to-year variation±137 kWh
MonthJulyMonthly output1,348 kWhDaily average43.5 kWh/dayYear-to-year variation±121 kWh
MonthAugustMonthly output1,169 kWhDaily average37.7 kWh/dayYear-to-year variation±146 kWh
MonthSeptemberMonthly output898 kWhDaily average29.9 kWh/dayYear-to-year variation±112 kWh
MonthOctoberMonthly output549 kWhDaily average17.7 kWh/dayYear-to-year variation±132 kWh
MonthNovemberMonthly output206 kWhDaily average6.9 kWh/dayYear-to-year variation±43 kWh
MonthDecemberMonthly output128 kWhDaily average4.1 kWh/dayYear-to-year variation±36 kWh
Nearby solar forecasts
Compare Riga with nearby cities
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Tomorrow, in one email
Get Riga'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.