Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Monday, August 31, 2026: 33.5 kWh from the 10 kWp reference system, with a likely range of 26.2 kWh–40.1 kWh. It changes with the next weather forecast.
Iceland · 10 kWp reference system
Keflavík solar forecast and PV yield
Photo: APK,CC BY 4.0. Cropped, resized and converted to WebP by GridPassport.
Forecast target: . Any “tomorrow” label on this page refers to this dated target.
- Tomorrow's forecast
- 33.5 kWh 10 kWp reference system
- Typical annual output
- 7,214 kWh 10 kWp reference system
- Typical specific yield
- 721 kWh/kWp Per year
Monday, August 31, 2026
About 33.5 kWh tomorrow
For a standard 10 kWp south-facing system in Keflavík, GridPassport estimates 33.5 kWh on Monday, August 31, 2026, with a likely range of 26.2-40.1 kWh. The strongest production window is expected at 14:00-18:00 local time.
Updated Aug 30, 2026, 11:01 PM GMT · fresh snapshot- Likely range
- 26.2-40.1 kWh
- Strongest window
- 14:00-18:00
- Confidence
- medium
How to read and use the data
Keflavík 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
Keflavík's PVGIS specific yield is about 721 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)10.1 kWh7.9 kWh–12.0 kWhPVGIS typical year2,164 kWh/year
5 kWpTomorrow estimate (likely range)16.8 kWh13.1 kWh–20.1 kWhPVGIS typical year3,607 kWh/year
10 kWpTomorrow estimate (likely range)33.5 kWh26.2 kWh–40.1 kWhPVGIS typical year7,214 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 16.8 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 10.1 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 Keflavík?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 16.8 kWh for Monday, August 31, 2026, with a scaled likely range of 13.1 kWh–20.1 kWh. This is a linear reference-system estimate, not a site survey.
What does 721 kWh/kWp mean for Keflavík?
It means the PVGIS multi-year profile produces about 721 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 3,607 kWh in a typical year before site-specific adjustments.
Is the Keflavík 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 Keflavík?
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 Keflavík
A standard 10 kWp system produces about 7,214 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
42Jan
187Feb
541Mar
861Apr
1243May
1137Jun
1163Jul
974Aug
617Sep
352Oct
85Nov
9Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Keflavík's solar profile different?The typical annual yield is about 721 kWh per installed kWp, ranking Keflavík #3 of 4 modelled locations in Iceland. That is 6% below the median of the 4 Iceland locations in this dataset. May is typically the strongest month and December the weakest; the stronger month produces about 139.0 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output42 kWhDaily average1.4 kWh/dayYear-to-year variation±17 kWh
MonthFebruaryMonthly output187 kWhDaily average6.7 kWh/dayYear-to-year variation±58 kWh
MonthMarchMonthly output541 kWhDaily average17.5 kWh/dayYear-to-year variation±143 kWh
MonthAprilMonthly output861 kWhDaily average28.7 kWh/dayYear-to-year variation±141 kWh
MonthMayMonthly output1,243 kWhDaily average40.1 kWh/dayYear-to-year variation±199 kWh
MonthJuneMonthly output1,137 kWhDaily average37.9 kWh/dayYear-to-year variation±228 kWh
MonthJulyMonthly output1,163 kWhDaily average37.5 kWh/dayYear-to-year variation±159 kWh
MonthAugustMonthly output974 kWhDaily average31.4 kWh/dayYear-to-year variation±136 kWh
MonthSeptemberMonthly output617 kWhDaily average20.6 kWh/dayYear-to-year variation±86 kWh
MonthOctoberMonthly output352 kWhDaily average11.4 kWh/dayYear-to-year variation±58 kWh
MonthNovemberMonthly output85 kWhDaily average2.9 kWh/dayYear-to-year variation±27 kWh
MonthDecemberMonthly output9 kWhDaily average0.3 kWh/dayYear-to-year variation±5 kWh
Nearby solar forecasts
Compare Keflavík with nearby cities
Tomorrow, in one email
Get Keflavík'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.