London · September · warmth

Warmest places to go from London in September

In September, the warmest well-known place within 15 hours of London is Aswan, Egypt, averaging 34.1 °C across day and night and 11.5 h sun a day, about 9h each way by air. Without flying, it is Lleida, Spain, averaging 21.7 °C across day and night, about 14h 18m each way by train, for about 30× less carbon (32.5 kg CO₂e return against 970 kg).

Every city at once, with and without flying: where is hot in September.

The 10 warmest places within 15 hours of London

Ranked on warmth in September alone, among well-known places (a Wikivoyage travel guide and at least 40,000 Wikipedia readers a year), one per area and at most three per country. The carbon is shown, not used to choose: the list further down is the other question, how much warmth each extra kilogram buys.

Aswan, Egypt34.1 °C · 11.5 h sun a day · mostly dryair ≈ 9h · 970 kg CO₂e return
Sharm el-Sheikh, Egypt33.7 °C · 11.5 h sun a day · mostly dry · sea 28.7 °Cair ≈ 8h 42m · 909 kg CO₂e return
Luxor, Egypt33.6 °C · 11.6 h sun a day · mostly dryair ≈ 8h 48m · 932 kg CO₂e return
Aqaba, Jordan31.5 °C · 11.4 h sun a day · mostly dry · sea 27.8 °Cair ≈ 8h 30m · 886 kg CO₂e return
Sanliurfa, Turkey27.7 °C · 11.4 h sun a day · mostly dryair ≈ 8h 6m · 862 kg CO₂e return
Adana, Turkey27.5 °C · 11.1 h sun a day · 1.5 mm rain a dayair ≈ 7h 48m · 807 kg CO₂e return
Famagusta, Cyprus27.1 °C · 11.4 h sun a day · mostly dry · sea 28.6 °Cair ≈ 7h 48m · 820 kg CO₂e return
Kairouan, Tunisia27.0 °C · 10.7 h sun a day · mostly dryair ≈ 6h 6m · 488 kg CO₂e return
Rhodes, Greece27.0 °C · 11.8 h sun a day · mostly dry · sea 27.4 °Cair ≈ 7h 12m · 702 kg CO₂e return
Batman, Turkey26.8 °C · 11.6 h sun a day · mostly dryair ≈ 8h 12m · 889 kg CO₂e return

Without flying

The warmest places the train reaches within 15 hours. Lleida is 21.7 °C for 32.5 kg — about 30× less carbon than flying to Aswan.

Lleida, Spain21.7 °C · 10.5 h sun a day · 2.3 mm rain a dayrail ≈ 14h 18m · 32.5 kg CO₂e return
Reus, Spain21.5 °C · 10.3 h sun a day · 2.6 mm rain a day · sea 25.1 °Crail ≈ 14h 24m · 34.1 kg CO₂e return
Barcelona, Spain21.5 °C · 10.2 h sun a day · 2.6 mm rain a day · sea 25.2 °Crail ≈ 12h 30m · 33.6 kg CO₂e return
Toulon, France21.3 °C · 10.6 h sun a day · 2.1 mm rain a day · sea 23.3 °Crail ≈ 9h 42m · 30.6 kg CO₂e return
Perpignan, France21.3 °C · 10.1 h sun a day · mostly dry · sea 21.4 °Crail ≈ 10h 48m · 29.7 kg CO₂e return
Nice, France21.2 °C · 10.3 h sun a day · 3.3 mm rain a day · sea 24.2 °Crail ≈ 11h 30m · 30.4 kg CO₂e return

≈ is the model's estimate (air times include getting to and through the airport); ✓ is a rail journey checked against a real timetable, with the date it was checked. Temperatures are historical daily means for 2023–2024, averaged across day and night, so afternoons run warmer.

The low-carbon trade-off

The warmest place you can reach from London in September within 15 hours is Sharm el-Sheikh, 33.7 °C, costing 909 kg CO₂e return. The lowest-carbon option is Calais at 4.5 kg — 202× less carbon, for 16.5 degrees less warmth.

Every destination here is on the efficiency frontier: nowhere else this site covers is both warmer 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 London. Pick one to compare.

By rail or ferry By air

Carbon against warmth, September, departing London. Journeys of up to 15 hours each way.

September from London — 15 destinations on the frontier, 6 without flying.
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	5h 24m
Bourges, France	Rail	15.5 kg	18.0 °C	9.0 h	2.8 mm	8h 12m
Bordeaux, France	Rail	21.9 kg	18.9 °C	9.8 h	3.2 mm	8h 12m ✓
Avignon, France	Rail	27.1 kg	20.1 °C	10.3 h	3.1 mm	8h 42m ✓
Perpignan, France	Rail	29.7 kg	21.3 °C	10.1 h	1.1 mm	10h 48m
Cannes, France	Rail	30.5 kg	21.7 °C	10.3 h	3.3 mm	11h 30m
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
Nefta, Tunisia	Air	519 kg	29.6 °C	10.2 h	0.2 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

The flights, in practice

The model measures to the town, not to a runway. For the destinations above reached by air, this is the nearest airport, how far it is, and whether a direct flight from London is listed on the airport's own destination page (researched 2026-09-15; route existence, not availability on a date). "Not checked" means no destination list was read for that airport.

Airports for the air destinations on this frontier, checked 2026-09-15.
Destination	Airport	From town	Direct from London	Onward
Bastia, France	Bastia–Poretta BIA	17 km	seasonal LGW — The published 2026 service operated 2 May–17 October.	Airport bus or taxi to Bastia.
Alzira, Spain	Valencia VLC	45 km	yes LHR, LGW, LTN, STN	Metro lines 3 or 5 to Valencia, then Cercanías train to Alzira.
Ibiza Town, Spain	Ibiza IBZ	8 km	yes LHR, LGW, LCY, LTN, STN	Public bus or taxi to Ibiza Town.
Bizerte, Tunisia	Tunis–Carthage TUN	70 km	not checked	Taxi or transfer to Bizerte; operator-published journey time not found.
Kairouan, Tunisia	Enfidha–Hammamet NBE	70 km	not checked	Road transfer to Kairouan; a direct scheduled public-transport link was not found.
Nefta, Tunisia	Tozeur–Nefta TOE	25 km	not checked	Taxi or road transfer from the airport.
Assiut, Egypt	Assiut ATZ	30 km	not checked	Taxi or arranged road transfer into Assiut.
Sohag, Egypt	Sohag International HMB	40 km	not checked	Taxi or arranged road transfer to Sohag.
Sharm el-Sheikh, Egypt	Sharm El Sheikh International SSH	10 km	yes LGW, LTN	Airport taxi or arranged transfer to Sharm El Sheikh.

Sources for this table

Bastia: bastia-aeroport.cci.corsica
Alzira: www.aena.es
Ibiza Town: www.aena.es
Sharm el-Sheikh: www.easyjet.com

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 Cannes (30.5 kg, 21.7 °C) to Bastia (306 kg, 22.5 °C) buys 0.8 °C more warmth for an extra 275 kg — 344 kg of CO₂e per degree. That single step is the most expensive warmth on the whole curve.

The pick of them

CalaisFrance4.5 kg CO₂e return17.2 °C · 8.8 h sun · 5h 24m by railwarm but wet

CannesFrance30.5 kg CO₂e return21.7 °C · 10.3 h sun · 11h 30m by railwarm but wet

Sharm el-SheikhEgypt909 kg CO₂e return33.7 °C · 11.5 h sun · 8h 42m by airwarm, bright and dry

The same month, asked differently

September answers differently depending on what you are after, and the lists genuinely diverge: the brightest places are not the hottest, and in summer the useful question stops being where is warm at all.

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.

Search places to stay in Sharm el-Sheikh →Opens the booking search in a new tab. Same partners as the map below.

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

Photo credits

Cannes: Jenny Andersson / News Oresund, CC BY 2.0, via Wikimedia Commons
Sharm el-Sheikh: Tanya Dedyukhina, CC BY 3.0, via Wikimedia Commons
Aswan: Vyacheslav Argenberg, CC BY 4.0, via Wikimedia Commons
Luxor: Roland Unger, CC BY-SA 3.0, via Wikimedia Commons
Aqaba: Sana Janakat, CC BY-SA 4.0, via Wikimedia Commons
Sanliurfa: Damien Halleux Radermecker, CC BY-SA 2.0, via Wikimedia Commons
Adana: Anatolianpride, Public domain, via Wikimedia Commons
Kairouan: Unknown authorUnknown author, Public domain, via Wikimedia Commons
Rhodes: Bernard Gagnon, CC BY-SA 4.0, via Wikimedia Commons
Batman: Ferhat 72 at Turkish Wikipedia, Public domain, via Wikimedia Commons
Lleida: Jorge Franganillo from Barcelona, Spain, CC BY 2.0, via Wikimedia Commons
Toulon: Rafi88, CC BY-SA 4.0, via Wikimedia Commons
Perpignan: Jean Tosti, Public domain, via Wikimedia Commons
Nice: Moody Dreiza (Moody751 at English Wikipedia), CC BY 2.5, via Wikimedia Commons

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 (modelled).

Can I get somewhere warm from London in September without flying?

Yes. Cannes reaches 21.7 °C and is reachable by rail or ferry in 11h 30m (modelled), emitting 30.5 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.