Warmest places to go from London in September
The warmest place you can reach from London in September within 15 hours is Sharm el-Sheikh at 33.7 °C, costing 909 kg CO₂e return. The lowest-carbon option is Calais at 4.5 kg — 202× less carbon for 16.5 °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 — 260 kg CO₂e, in 4h 54m. Allow up to 24 hours and the train does the same journey for 30.5 kg in 16h 6m — 9× less carbon for 11h 12m more travelling.
| Destination | How | CO₂e return | Temp | Sun/day | Rain/day | Journey |
|---|---|---|---|---|---|---|
| Calais, France | Rail | 4.5 kg | 17.2 °C | 8.8 h | 3.3 mm | 4h 6m |
| Bourges, France | Rail | 15.5 kg | 18.0 °C | 9.0 h | 2.8 mm | 9h 12m |
| Bordeaux, France | Rail | 21.9 kg | 18.9 °C | 9.8 h | 3.2 mm | 12h 12m |
| Avignon, France | Rail | 27.1 kg | 20.1 °C | 10.3 h | 3.1 mm | 14h 36m |
| Arles, France | Rail | 27.8 kg | 20.8 °C | 10.4 h | 2.6 mm | 14h 54m |
| Cannes, France | Air | 260 kg | 21.7 °C | 10.3 h | 3.3 mm | 4h 54m |
| Bastia, France | Air | 306 kg | 22.5 °C | 10.6 h | 1.9 mm | 5h 6m |
| Alzira, Spain | Air | 346 kg | 23.3 °C | 10.1 h | 2.4 mm | 5h 18m |
| Ibiza Town, Spain | Air | 354 kg | 24.2 °C | 10.8 h | 1.6 mm | 5h 24m |
| Bizerte, Tunisia | Air | 445 kg | 25.4 °C | 10.8 h | 0.4 mm | 5h 54m |
| Kairouan, Tunisia | Air | 488 kg | 27.0 °C | 10.7 h | 0.7 mm | 6h 6m |
| Tozeur, Tunisia | Air | 520 kg | 29.4 °C | 10.3 h | 0.3 mm | 6h 18m |
| Assiut, Egypt | Air | 881 kg | 31.6 °C | 11.7 h | 0.0 mm | 8h 30m |
| Sohag, Egypt | Air | 901 kg | 32.3 °C | 11.7 h | 0.0 mm | 8h 36m |
| Sharm el-Sheikh, Egypt | Air | 909 kg | 33.7 °C | 11.5 h | 0.0 mm | 8h 42m |
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 Arles (27.8 kg, 20.8 °C) to Cannes (260 kg, 21.7 °C) buys 0.9 °C more warmth for an extra 232 kg — 258 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 London 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 London
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 London in September?
Sharm el-Sheikh, Egypt, at 33.7 °C. Reaching it emits 909 kg CO₂e return, travelling 8h 42m each way by air.
Can I get somewhere warm from London in September without flying?
Yes. Arles reaches 20.8 °C and is reachable by rail or ferry in 14h 54m, emitting 27.8 kg CO₂e return — though Sharm el-Sheikh is warmer still, if you fly.
How much carbon does a return trip from London to Sharm el-Sheikh produce?
909 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.