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Cardiff · September · warmth

Warmest places to go from Cardiff in September

In September, the warmest well-known place within 15 hours of Cardiff is Aswan, Egypt, averaging 34.1 °C across day and night and 11.5 h sun a day, about 9h 18m each way by air. Without flying, it is Toulon, France, averaging 21.3 °C across day and night, about 13h each way by train, for about 21× less carbon (47.6 kg CO₂e return against 1,011 kg).

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

The 10 warmest places within 15 hours of Cardiff

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.

  1. Aswan, Egypt34.1 °C · 11.5 h sun a day · mostly dryair ≈ 9h 18m · 1,011 kg CO₂e return
  2. Sharm el-Sheikh, Egypt33.7 °C · 11.5 h sun a day · mostly dry · sea 28.7 °Cair ≈ 8h 54m · 953 kg CO₂e return
  3. Luxor, Egypt33.6 °C · 11.6 h sun a day · mostly dryair ≈ 9h · 974 kg CO₂e return
  4. Aqaba, Jordan31.5 °C · 11.4 h sun a day · mostly dry · sea 27.8 °Cair ≈ 8h 48m · 931 kg CO₂e return
  5. Sanliurfa, Turkey27.7 °C · 11.4 h sun a day · mostly dryair ≈ 8h 18m · 914 kg CO₂e return
  6. Adana, Turkey27.5 °C · 11.1 h sun a day · 1.5 mm rain a dayair ≈ 8h · 858 kg CO₂e return
  7. Famagusta, Cyprus27.1 °C · 11.4 h sun a day · mostly dry · sea 28.6 °Cair ≈ 8h 6m · 870 kg CO₂e return
  8. Kairouan, Tunisia27.0 °C · 10.7 h sun a day · mostly dryair ≈ 6h 12m · 516 kg CO₂e return
  9. Rhodes, Greece27.0 °C · 11.8 h sun a day · mostly dry · sea 27.4 °Cair ≈ 7h 30m · 750 kg CO₂e return
  10. Batman, Turkey26.8 °C · 11.6 h sun a day · mostly dryair ≈ 8h 30m · 877 kg CO₂e return

Without flying

The warmest places the train reaches within 15 hours. Toulon is 21.3 °C for 47.6 kg — about 21× less carbon than flying to Aswan.

  1. Toulon, France21.3 °C · 10.6 h sun a day · 2.1 mm rain a day · sea 23.3 °Crail ≈ 13h · 47.6 kg CO₂e return
  2. Perpignan, France21.3 °C · 10.1 h sun a day · mostly dry · sea 21.4 °Crail ≈ 14h 6m · 46.7 kg CO₂e return
  3. Nice, France21.2 °C · 10.3 h sun a day · 3.3 mm rain a day · sea 24.2 °Crail ≈ 14h 48m · 47.3 kg CO₂e return
  4. Avignon, France20.1 °C · 10.3 h sun a day · 3.1 mm rain a dayrail ≈ 11h 48m · 44.1 kg CO₂e return
  5. Turin, Italy18.7 °C · 9.6 h sun a day · 3.5 mm rain a dayrail ≈ 14h 48m · 44.1 kg CO₂e return
  6. Karlsruhe, Germany18.1 °C · 9.7 h sun a day · 2.3 mm rain a dayrail ≈ 13h · 36.7 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 Cardiff in September within 15 hours is Sharm el-Sheikh, 33.7 °C, costing 953 kg CO₂e return. The lowest-carbon option is Portsmouth at 13.2 kg — 72× less carbon, for 17.1 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.

PortsmouthSharm el-Sheikh
Where they are. Solid lines are rail or ferry, dashed are flights, from Cardiff. Pick one to compare.
Carbon against warmth, September, departing Cardiff. Journeys of up to 15 hours each way.17 destinations. Lowest carbon Portsmouth at 13.2 kilograms and 16.6 °C; best for warmth Sharm el-Sheikh at 953 kilograms and 33.7 °C. Portsmouth · 13.2 kgNefta · 541 kgMinya · 898 kgSharm el-Sheikh · 953 kg

By rail or ferry By air

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

What the 15-hour limit costs: at this budget Palma del Rio can only be reached by air — 388 kg CO₂e, in 5h 36m. Allow up to 24 hours and the train does the same journey for 63.8 kg in 23h 36m — 6× less carbon for 18h more travelling.

September from Cardiff — 17 destinations on the frontier, 7 without flying.
DestinationHowCO₂e returnTempSun/dayRain/dayJourney
Portsmouth, United KingdomRail13.2 kg16.6 °C8.6 h3.5 mm3h 54m
Dunkirk, FranceRail22.4 kg17.3 °C8.8 h3.0 mm8h 18m
Angers, FranceRail30.3 kg17.8 °C9.0 h2.3 mm12h 12m
La Rochelle, FranceRail34.7 kg18.7 °C10.0 h3.5 mm12h 54m
Nîmes, FranceRail44.0 kg20.3 °C10.4 h2.3 mm12h 6m
Perpignan, FranceRail46.7 kg21.3 °C10.1 h1.1 mm14h 6m
Cannes, FranceRail47.5 kg21.7 °C10.3 h3.3 mm14h 48m
Valencia, SpainAir340 kg22.9 °C10.6 h3.5 mm5h 18m
Alzira, SpainAir349 kg23.3 °C10.1 h2.4 mm5h 18m
Palma del Rio, SpainAir388 kg24.4 °C10.9 h0.9 mm5h 36m
Bizerte, TunisiaAir474 kg25.4 °C10.8 h0.4 mm6h
Kairouan, TunisiaAir516 kg27.0 °C10.7 h0.7 mm6h 12m
Nefta, TunisiaAir541 kg29.6 °C10.2 h0.2 mm6h 24m
Minya, EgyptAir898 kg31.0 °C11.8 h0.0 mm8h 36m
Assiut, EgyptAir923 kg31.6 °C11.7 h0.0 mm8h 48m
Sohag, EgyptAir943 kg32.3 °C11.7 h0.0 mm8h 54m
Sharm el-Sheikh, EgyptAir953 kg33.7 °C11.5 h0.0 mm8h 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 Nefta (541 kg, 29.6 °C) to Minya (898 kg, 31.0 °C) buys 1.4 °C more warmth for an extra 357 kg — 255 kg of CO₂e per degree. That single step is the most expensive warmth on the whole curve.

The pick of them

Portsmouth, United KingdomPortsmouthUnited Kingdom13.2 kg CO₂e return16.6 °C · 8.6 h sun · 3h 54m by railwarm but wetCannes, FranceCannesFrance47.5 kg CO₂e return21.7 °C · 10.3 h sun · 14h 48m by railwarm but wetSharm el-Sheikh, EgyptSharm el-SheikhEgypt953 kg CO₂e return33.7 °C · 11.5 h sun · 8h 54m 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 Cardiff

September from elsewhere

Photo credits

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 (modelled).

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

Yes. Cannes reaches 21.7 °C and is reachable by rail or ferry in 14h 48m (modelled), emitting 47.5 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.