Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 32.4 kWh from the 10 kWp reference system, with a likely range of 22.4 kWh–41.4 kWh. It changes with the next weather forecast.
United Kingdom · 10 kWp reference system
Bristol solar forecast and PV yield
Photo: Chris Lathom-Sharp,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
- 32.4 kWh 10 kWp reference system
- Typical annual output
- 10,228 kWh 10 kWp reference system
- Typical specific yield
- 1,023 kWh/kWp Per year
Tuesday, September 1, 2026
About 32.4 kWh tomorrow
For a standard 10 kWp south-facing system in Bristol, GridPassport estimates 32.4 kWh on Tuesday, September 1, 2026, with a likely range of 22.4-41.4 kWh. The strongest production window is expected at 12:00-16:00 local time.
Updated Aug 31, 2026, 12:01 AM GMT+1 · fresh snapshot- Likely range
- 22.4-41.4 kWh
- Strongest window
- 12:00-16:00
- Confidence
- medium
How to read and use the data
Bristol 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
Bristol's PVGIS specific yield is about 1,023 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)9.7 kWh6.7 kWh–12.4 kWhPVGIS typical year3,068 kWh/year
5 kWpTomorrow estimate (likely range)16.2 kWh11.2 kWh–20.7 kWhPVGIS typical year5,114 kWh/year
10 kWpTomorrow estimate (likely range)32.4 kWh22.4 kWh–41.4 kWhPVGIS typical year10,228 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 16.2 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 9.7 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 Bristol?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 16.2 kWh for Tuesday, September 1, 2026, with a scaled likely range of 11.2 kWh–20.7 kWh. This is a linear reference-system estimate, not a site survey.
What does 1,023 kWh/kWp mean for Bristol?
It means the PVGIS multi-year profile produces about 1,023 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 5,114 kWh in a typical year before site-specific adjustments.
Is the Bristol 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 Bristol?
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 Bristol
A standard 10 kWp system produces about 10,228 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
386Jan
542Feb
879Mar
1167Apr
1262May
1229Jun
1246Jul
1102Aug
951Sep
674Oct
451Nov
338Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Bristol's solar profile different?The typical annual yield is about 1,023 kWh per installed kWp, ranking Bristol #2 of 12 modelled locations in United Kingdom. That is 8% above the median of the 12 United Kingdom locations in this dataset. May is typically the strongest month and December the weakest; the stronger month produces about 3.7 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output386 kWhDaily average12.5 kWh/dayYear-to-year variation±53 kWh
MonthFebruaryMonthly output542 kWhDaily average19.4 kWh/dayYear-to-year variation±95 kWh
MonthMarchMonthly output879 kWhDaily average28.4 kWh/dayYear-to-year variation±143 kWh
MonthAprilMonthly output1,167 kWhDaily average38.9 kWh/dayYear-to-year variation±155 kWh
MonthMayMonthly output1,262 kWhDaily average40.7 kWh/dayYear-to-year variation±147 kWh
MonthJuneMonthly output1,229 kWhDaily average41.0 kWh/dayYear-to-year variation±153 kWh
MonthJulyMonthly output1,246 kWhDaily average40.2 kWh/dayYear-to-year variation±133 kWh
MonthAugustMonthly output1,102 kWhDaily average35.5 kWh/dayYear-to-year variation±126 kWh
MonthSeptemberMonthly output951 kWhDaily average31.7 kWh/dayYear-to-year variation±82 kWh
MonthOctoberMonthly output674 kWhDaily average21.7 kWh/dayYear-to-year variation±71 kWh
MonthNovemberMonthly output451 kWhDaily average15.0 kWh/dayYear-to-year variation±65 kWh
MonthDecemberMonthly output338 kWhDaily average10.9 kWh/dayYear-to-year variation±68 kWh
Nearby solar forecasts
Compare Bristol with nearby cities
Tomorrow, in one email
Get Bristol'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.