Sunniest places to go from Cardiff in September
The sunniest place you can reach from Cardiff in September within 15 hours is Fethiye at 11.8 h, costing 761 kg CO₂e return. The lowest-carbon option is Reading at 12.3 kg — 62× less carbon for 3.9 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.
By rail or ferry By air
What the 15-hour limit costs: at this budget Aix-en-Provence can only be reached by air — 275 kg CO₂e, in 5h. Allow up to 24 hours and the train does the same journey for 45.9 kg in 18h 18m — 6× less carbon for 13h 18m more travelling.
| Destination | How | CO₂e return | Temp | Sun/day | Rain/day | Journey |
|---|---|---|---|---|---|---|
| Reading, United Kingdom | Rail | 12.3 kg | 16.1 °C | 7.9 h | 4.1 mm | 4h 6m |
| Portsmouth, United Kingdom | Rail | 13.2 kg | 16.6 °C | 8.6 h | 3.5 mm | 4h 12m |
| Leiden, The Netherlands | Rail | 26.6 kg | 17.0 °C | 9.3 h | 3.7 mm | 9h 18m |
| Düsseldorf, Germany | Rail | 31.2 kg | 17.5 °C | 9.9 h | 2.7 mm | 11h 30m |
| Aix-en-Provence, France | Air | 275 kg | 19.3 °C | 10.8 h | 2.1 mm | 5h |
| Granada, Spain | Air | 400 kg | 21.6 °C | 11.5 h | 0.9 mm | 5h 36m |
| Fethiye, Turkey | Air | 761 kg | 26.0 °C | 11.8 h | 1.6 mm | 7h 30m |
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 Granada (400 kg, 11.5 h) to Fethiye (761 kg, 11.8 h) buys 0.3 hours more sunshine for an extra 361 kg — 1205 kg of CO₂e per hour. That single step is the most expensive sunshine on the whole curve.
The pick of them
If you'd rather have heat than sunshine
September answers differently depending on what you're after. The warmest destinations from Cardiff 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 Fethiye
Places to stay in Fethiye, 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 Cardiff
September from elsewhere
- Amsterdam
- Barcelona
- Berlin
- Birmingham
- Bristol
- Brussels
- Cardiff
- Copenhagen
- Dublin
- Edinburgh
- Frankfurt
- Glasgow
- Leeds
- Lisbon
- Liverpool
- London
- Madrid
- Manchester
- Milan
- Munich
- Newcastle
- Nottingham
- Oslo
- Paris
- Prague
- Rome
- Sheffield
- Southampton
- Stockholm
- Vienna
- Warsaw
- Zurich
Questions
Where is the sunniest place to go from Cardiff in September?
Fethiye, Turkey, at 11.8 h. Reaching it emits 761 kg CO₂e return, travelling 7h 30m each way by air.
Can I get somewhere sunny from Cardiff in September without flying?
Yes. Düsseldorf reaches 9.9 h and is reachable by rail or ferry in 11h 30m, emitting 31.2 kg CO₂e return — though Fethiye is sunnier still, if you fly.
How much carbon does a return trip from Cardiff to Fethiye produce?
761 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.