Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 26.5 kWh from the 10 kWp reference system, with a likely range of 18.0 kWh–34.5 kWh. It changes with the next weather forecast.
Sweden · 10 kWp reference system
Umeå solar forecast and PV yield
Photo: Jonipoon,CC BY-SA 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
- 26.5 kWh 10 kWp reference system
- Typical annual output
- 9,331 kWh 10 kWp reference system
- Typical specific yield
- 933 kWh/kWp Per year
Tuesday, September 1, 2026
About 26.5 kWh tomorrow
For a standard 10 kWp south-facing system in Umeå, GridPassport estimates 26.5 kWh on Tuesday, September 1, 2026, with a likely range of 18.0-34.5 kWh. The strongest production window is expected at 12:00-16:00 local time.
Updated Aug 31, 2026, 01:01 AM GMT+2 · fresh snapshot- Likely range
- 18.0-34.5 kWh
- Strongest window
- 12:00-16:00
- Confidence
- medium
How to read and use the data
Umeå 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
Umeå's PVGIS specific yield is about 933 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, June 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)8.0 kWh5.4 kWh–10.3 kWhPVGIS typical year2,799 kWh/year
5 kWpTomorrow estimate (likely range)13.3 kWh9.0 kWh–17.3 kWhPVGIS typical year4,665 kWh/year
10 kWpTomorrow estimate (likely range)26.5 kWh18.0 kWh–34.5 kWhPVGIS typical year9,331 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 12:00-16:00 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 13.3 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 12:00-16:00. Never override frost protection, hygiene cycles or manufacturer limits.
Large loads
Avoid stacking appliances
A 3 kWp system scales to about 8.0 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 Umeå?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 13.3 kWh for Tuesday, September 1, 2026, with a scaled likely range of 9.0 kWh–17.3 kWh. This is a linear reference-system estimate, not a site survey.
What does 933 kWh/kWp mean for Umeå?
It means the PVGIS multi-year profile produces about 933 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 4,665 kWh in a typical year before site-specific adjustments.
Is the Umeå 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 Umeå?
Start with 12:00-16:00, 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 Umeå
A standard 10 kWp system produces about 9,331 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
68Jan
315Feb
936Mar
1156Apr
1441May
1479Jun
1435Jul
1172Aug
774Sep
428Oct
108Nov
19Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Umeå's solar profile different?The typical annual yield is about 933 kWh per installed kWp, ranking Umeå #7 of 7 modelled locations in Sweden. That is 3% below the median of the 7 Sweden locations in this dataset. June is typically the strongest month and December the weakest; the stronger month produces about 77.8 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output68 kWhDaily average2.2 kWh/dayYear-to-year variation±46 kWh
MonthFebruaryMonthly output315 kWhDaily average11.2 kWh/dayYear-to-year variation±90 kWh
MonthMarchMonthly output936 kWhDaily average30.2 kWh/dayYear-to-year variation±144 kWh
MonthAprilMonthly output1,156 kWhDaily average38.5 kWh/dayYear-to-year variation±169 kWh
MonthMayMonthly output1,441 kWhDaily average46.5 kWh/dayYear-to-year variation±168 kWh
MonthJuneMonthly output1,479 kWhDaily average49.3 kWh/dayYear-to-year variation±130 kWh
MonthJulyMonthly output1,435 kWhDaily average46.3 kWh/dayYear-to-year variation±156 kWh
MonthAugustMonthly output1,172 kWhDaily average37.8 kWh/dayYear-to-year variation±137 kWh
MonthSeptemberMonthly output774 kWhDaily average25.8 kWh/dayYear-to-year variation±136 kWh
MonthOctoberMonthly output428 kWhDaily average13.8 kWh/dayYear-to-year variation±116 kWh
MonthNovemberMonthly output108 kWhDaily average3.6 kWh/dayYear-to-year variation±32 kWh
MonthDecemberMonthly output19 kWhDaily average0.6 kWh/dayYear-to-year variation±8 kWh
Nearby solar forecasts
Compare Umeå with nearby cities
Tomorrow, in one email
Get Umeå'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.