Dated, weather-based
Tomorrow's forecast
Tomorrow's value is a weather-based estimate for Tuesday, September 1, 2026: 15.5 kWh from the 10 kWp reference system, with a likely range of 9.6 kWh–21.4 kWh. It changes with the next weather forecast.
Ireland · 10 kWp reference system
Galway solar forecast and PV yield
Photo: Unknown author Unknown author,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
- 15.5 kWh 10 kWp reference system
- Typical annual output
- 9,262 kWh 10 kWp reference system
- Typical specific yield
- 926 kWh/kWp Per year
Tuesday, September 1, 2026
About 15.5 kWh tomorrow
For a standard 10 kWp south-facing system in Galway, GridPassport estimates 15.5 kWh on Tuesday, September 1, 2026, with a likely range of 9.6-21.4 kWh. The strongest production window is expected at 09:00-13:00 local time.
Updated Aug 31, 2026, 12:01 AM GMT+1 · fresh snapshot- Likely range
- 9.6-21.4 kWh
- Strongest window
- 09:00-13:00
- Confidence
- medium
How to read and use the data
Galway 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
Galway's PVGIS specific yield is about 926 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)4.7 kWh2.9 kWh–6.4 kWhPVGIS typical year2,779 kWh/year
5 kWpTomorrow estimate (likely range)7.8 kWh4.8 kWh–10.7 kWhPVGIS typical year4,631 kWh/year
10 kWpTomorrow estimate (likely range)15.5 kWh9.6 kWh–21.4 kWhPVGIS typical year9,262 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 09:00-13:00 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 7.8 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 09:00-13:00. Never override frost protection, hygiene cycles or manufacturer limits.
Large loads
Avoid stacking appliances
A 3 kWp system scales to about 4.7 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 Galway?
Using the same south-facing, 35-degree and 14% loss assumptions, the 5 kWp estimate is 7.8 kWh for Tuesday, September 1, 2026, with a scaled likely range of 4.8 kWh–10.7 kWh. This is a linear reference-system estimate, not a site survey.
What does 926 kWh/kWp mean for Galway?
It means the PVGIS multi-year profile produces about 926 kWh in a typical year for each installed kWp under the reference assumptions. A 5 kWp system therefore scales to about 4,631 kWh in a typical year before site-specific adjustments.
Is the Galway 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 Galway?
Start with 09:00-13:00, 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 Galway
A standard 10 kWp system produces about 9,262 kWh in a typical year at this location. Monthly averages show seasonality; they are not a forecast for a specific year.
318Jan
474Feb
805Mar
1117Apr
1242May
1153Jun
1091Jul
1011Aug
793Sep
595Oct
387Nov
275Dec
Values are kWh per month. Source: European Commission JRC PVGIS.
What makes Galway's solar profile different?The typical annual yield is about 926 kWh per installed kWp, ranking Galway #4 of 5 modelled locations in Ireland. That is 6% below the median of the 5 Ireland locations in this dataset. May is typically the strongest month and December the weakest; the stronger month produces about 4.5 times as much.
See the 12-month data
MonthMonthly outputDaily averageYear-to-year variation
MonthJanuaryMonthly output318 kWhDaily average10.3 kWh/dayYear-to-year variation±68 kWh
MonthFebruaryMonthly output474 kWhDaily average16.9 kWh/dayYear-to-year variation±63 kWh
MonthMarchMonthly output805 kWhDaily average26.0 kWh/dayYear-to-year variation±130 kWh
MonthAprilMonthly output1,117 kWhDaily average37.2 kWh/dayYear-to-year variation±142 kWh
MonthMayMonthly output1,242 kWhDaily average40.0 kWh/dayYear-to-year variation±113 kWh
MonthJuneMonthly output1,153 kWhDaily average38.4 kWh/dayYear-to-year variation±118 kWh
MonthJulyMonthly output1,091 kWhDaily average35.2 kWh/dayYear-to-year variation±83 kWh
MonthAugustMonthly output1,011 kWhDaily average32.6 kWh/dayYear-to-year variation±91 kWh
MonthSeptemberMonthly output793 kWhDaily average26.4 kWh/dayYear-to-year variation±75 kWh
MonthOctoberMonthly output595 kWhDaily average19.2 kWh/dayYear-to-year variation±83 kWh
MonthNovemberMonthly output387 kWhDaily average12.9 kWh/dayYear-to-year variation±54 kWh
MonthDecemberMonthly output275 kWhDaily average8.9 kWh/dayYear-to-year variation±56 kWh
Nearby solar forecasts
Compare Galway with nearby cities
Tomorrow, in one email
Get Galway'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.