Warsaw · September · sunshine

Sunniest places to go from Warsaw in September

The sunniest place you can reach from Warsaw in September within 15 hours is Izmir at 11.6 h, costing 404 kg CO₂e return. The lowest-carbon option is Lublin at 4.5 kg — 90× less carbon for 1.6 h less.

Every destination here is on the efficiency frontier: nowhere else in Europe is both sunnier in September and lower in carbon. Anything a better option beats outright has been left out.

Where they are. Solid lines are rail or ferry, dashed are flights, from Warsaw. Pick one to compare.

By rail or ferry By air

Carbon against sunshine, September, departing Warsaw. Journeys of up to 15 hours each way.

What the 15-hour limit costs: at this budget Izmir can only be reached by air — 404 kg CO₂e, in 5h 36m. Allow up to 24 hours and the train does the same journey for 47.4 kg in 24h — 9× less carbon for 18h 24m more travelling.

September from Warsaw — 4 destinations on the frontier, 2 without flying.
Destination	How	CO₂e return	Temp	Sun/day	Rain/day	Journey
Lublin, Poland	Rail	4.5 kg	17.9 °C	10.0 h	1.6 mm	4h 6m
Kaunas, Lithuania	Rail	10.4 kg	17.5 °C	10.6 h	1.1 mm	6h 48m
Mangalia, Romania	Air	274 kg	21.1 °C	11.1 h	1.7 mm	5h
Izmir, Turkey	Air	404 kg	24.9 °C	11.6 h	1.0 mm	5h 36m

Warm is not the same as pleasant, which is why sunshine and rainfall are shown alongside temperature. All three are ERA5 monthly means for 2023–2024.

Where the curve breaks

The frontier is gentle until it isn't. Going from Kaunas (10.4 kg, 10.6 h) to Mangalia (274 kg, 11.1 h) buys 0.5 hours more sunshine for an extra 264 kg — 528 kg of CO₂e per hour. That single step is the most expensive sunshine on the whole curve.

The pick of them

LublinPoland4.5 kg CO₂e return17.9 °C · 10.0 h sun · 4h 6m by railwarm overall KaunasLithuania10.4 kg CO₂e return17.5 °C · 10.6 h sun · 6h 48m by railwarm, bright and dry IzmirTurkey404 kg CO₂e return24.9 °C · 11.6 h sun · 5h 36m by airwarm, bright and dry

If you'd rather have heat than sunshine

September answers differently depending on what you're after. The warmest destinations from Warsaw in September are a different list — hours of sunshine and degrees of warmth come apart, especially early and late in the year.

Where to stay in Izmir

Places to stay in Izmir, Turkey, on a live map. Prices and availability come from Stay22 and its booking partners.

Affiliate disclosure. A booking made through this map may earn 0xCarbon a commission, at no extra cost to you. It changes nothing above it: the emissions figures come from UK Government conversion factors and are computed before anyone is paid anything.See the method.

Other months from Warsaw

September from elsewhere

Questions

Where is the sunniest place to go from Warsaw in September?

Izmir, Turkey, at 11.6 h. Reaching it emits 404 kg CO₂e return, travelling 5h 36m each way by air.

Can I get somewhere sunny from Warsaw in September without flying?

Yes. Kaunas reaches 10.6 h and is reachable by rail or ferry in 6h 48m, emitting 10.4 kg CO₂e return — though Izmir is sunnier still, if you fly.

How much carbon does a return trip from Warsaw to Izmir produce?

404 kg CO₂e for one person, return, by air. That uses the UK Government's 2026 conversion factors, including radiative forcing for flights.

Carbon uses UK Government (DESNZ/DEFRA) 2026 conversion factors applied to great-circle distance, with radiative forcing included for flights. Rail journey times are modelled estimates, not timetabled services. Full method · download the data.