Warmest places to go from Cardiff in September
The warmest place you can reach from Cardiff in September within 15 hours is Sharm el-Sheikh at 33.7 °C, costing 953 kg CO₂e return. The lowest-carbon option is Portsmouth at 13.2 kg — 72× less carbon for 17.1 °C less.
Every destination here is on the efficiency frontier: nowhere else in Europe is both warmer 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 Cannes can only be reached by air — 293 kg CO₂e, in 5h 6m. Allow up to 24 hours and the train does the same journey for 47.5 kg in 19h — 6× less carbon for 13h 54m more travelling.
| Destination | How | CO₂e return | Temp | Sun/day | Rain/day | Journey |
|---|---|---|---|---|---|---|
| Portsmouth, United Kingdom | Rail | 13.2 kg | 16.6 °C | 8.6 h | 3.5 mm | 4h 12m |
| Dunkirk, France | Rail | 22.4 kg | 17.3 °C | 8.8 h | 3.0 mm | 7h 24m |
| Angers, France | Rail | 30.3 kg | 17.8 °C | 9.0 h | 2.3 mm | 11h |
| La Rochelle, France | Rail | 34.7 kg | 18.7 °C | 10.0 h | 3.5 mm | 13h 6m |
| Nîmes, France | Air | 256 kg | 20.3 °C | 10.4 h | 2.3 mm | 4h 54m |
| Perpignan, France | Air | 271 kg | 21.3 °C | 10.1 h | 1.1 mm | 4h 54m |
| Cannes, France | Air | 293 kg | 21.7 °C | 10.3 h | 3.3 mm | 5h 6m |
| Valencia, Spain | Air | 340 kg | 22.9 °C | 10.6 h | 3.5 mm | 5h 18m |
| Alzira, Spain | Air | 349 kg | 23.3 °C | 10.1 h | 2.4 mm | 5h 18m |
| Ibiza Town, Spain | Air | 363 kg | 24.2 °C | 10.8 h | 1.6 mm | 5h 24m |
| Bizerte, Tunisia | Air | 474 kg | 25.4 °C | 10.8 h | 0.4 mm | 6h |
| Kairouan, Tunisia | Air | 516 kg | 27.0 °C | 10.7 h | 0.7 mm | 6h 12m |
| Tozeur, Tunisia | Air | 542 kg | 29.4 °C | 10.3 h | 0.3 mm | 6h 24m |
| Al Fayyum, Egypt | Air | 874 kg | 30.3 °C | 11.7 h | 0.0 mm | 8h 30m |
| Assiut, Egypt | Air | 923 kg | 31.6 °C | 11.7 h | 0.0 mm | 8h 48m |
| Sohag, Egypt | Air | 943 kg | 32.3 °C | 11.7 h | 0.0 mm | 8h 54m |
| Sharm el-Sheikh, Egypt | Air | 953 kg | 33.7 °C | 11.5 h | 0.0 mm | 8h 54m |
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 Tozeur (542 kg, 29.4 °C) to Al Fayyum (874 kg, 30.3 °C) buys 0.9 °C more warmth for an extra 332 kg — 369 kg of CO₂e per degree. That single step is the most expensive warmth on the whole curve.
The pick of them
If you'd rather have sunshine than heat
September answers differently depending on what you're after. The sunniest destinations from Cardiff in September are a different list — the brightest places are not always the hottest, and in winter the difference is large.
Where to stay in Sharm el-Sheikh
Places to stay in Sharm el-Sheikh, Egypt, 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 warmest place to go from Cardiff in September?
Sharm el-Sheikh, Egypt, at 33.7 °C. Reaching it emits 953 kg CO₂e return, travelling 8h 54m each way by air.
Can I get somewhere warm from Cardiff in September without flying?
Yes. La Rochelle reaches 18.7 °C and is reachable by rail or ferry in 13h 6m, emitting 34.7 kg CO₂e return — though Sharm el-Sheikh is warmer still, if you fly.
How much carbon does a return trip from Cardiff to Sharm el-Sheikh produce?
953 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.