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Cardiff · July · warmth

Warmest places to go from Cardiff in July

In July, the warmest well-known place within 15 hours of Cardiff is Aswan, Egypt, averaging 36.0 °C across day and night and 12.2 h sun a day, about 9h 18m each way by air. Without flying, it is Cannes, France, averaging 26.4 °C across day and night, about 14h 48m each way by train, for about 21× less carbon (47.5 kg CO₂e return against 1,011 kg).

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

The 10 warmest places within 15 hours of Cardiff

Ranked on warmth in July 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, Egypt36.0 °C · 12.2 h sun a day · mostly dryair ≈ 9h 18m · 1,011 kg CO₂e return
  2. Sharm el-Sheikh, Egypt35.9 °C · 13.0 h sun a day · mostly dry · sea 29.5 °Cair ≈ 8h 54m · 953 kg CO₂e return
  3. Luxor, Egypt35.8 °C · 12.4 h sun a day · mostly dryair ≈ 9h · 974 kg CO₂e return
  4. Aqaba, Jordan34.8 °C · 13.1 h sun a day · mostly dry · sea 28.2 °Cair ≈ 8h 48m · 931 kg CO₂e return
  5. Kairouan, Tunisia32.8 °C · 12.9 h sun a day · mostly dryair ≈ 6h 12m · 516 kg CO₂e return
  6. Sanliurfa, Turkey32.8 °C · 13.4 h sun a day · mostly dryair ≈ 8h 18m · 914 kg CO₂e return
  7. Batman, Turkey32.2 °C · 13.3 h sun a day · mostly dryair ≈ 8h 30m · 877 kg CO₂e return
  8. Marmaris, Turkey31.9 °C · 13.9 h sun a day · mostly dryair ≈ 7h 24m · 743 kg CO₂e return
  9. Tataouine, Tunisia31.8 °C · 12.9 h sun a day · mostly dryair ≈ 6h 36m · 589 kg CO₂e return
  10. Ouarzazate, Morocco31.6 °C · 12.0 h sun a day · mostly dryair ≈ 6h 36m · 580 kg CO₂e return

Without flying

The warmest places the train reaches within 15 hours. Cannes is 26.4 °C for 47.5 kg — about 21× less carbon than flying to Aswan.

  1. Cannes, France26.4 °C · 14.3 h sun a day · mostly dry · sea 25.5 °Crail ≈ 14h 48m · 47.5 kg CO₂e return
  2. Toulon, France26.2 °C · 14.0 h sun a day · mostly dry · sea 23.4 °Crail ≈ 13h · 47.6 kg CO₂e return
  3. Perpignan, France25.7 °C · 13.1 h sun a day · mostly dry · sea 22.7 °Crail ≈ 14h 6m · 46.7 kg CO₂e return
  4. Avignon, France25.4 °C · 13.7 h sun a day · mostly dryrail ≈ 11h 48m · 44.1 kg CO₂e return
  5. Turin, Italy24.6 °C · 13.4 h sun a day · 1.9 mm rain a dayrail ≈ 14h 48m · 44.1 kg CO₂e return
  6. Geneva, Switzerland21.6 °C · 13.0 h sun a day · 3.2 mm rain a dayrail ≈ 12h 12m · 39.0 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 July within 15 hours is Nefta, 36.0 °C, costing 541 kg CO₂e return. The lowest-carbon option is Portsmouth at 13.2 kg — 41× less carbon, for 18.8 degrees less warmth.

Every destination here is on the efficiency frontier: nowhere else this site covers is both warmer in July and lower in carbon. Anything a better option beats outright has been left out.

PortsmouthNefta
Where they are. Solid lines are rail or ferry, dashed are flights, from Cardiff. Pick one to compare.
Carbon against warmth, July, departing Cardiff. Journeys of up to 15 hours each way.18 destinations. Lowest carbon Portsmouth at 13.2 kilograms and 17.2 °C; best for warmth Nefta at 541 kilograms and 36.0 °C. Portsmouth · 13.2 kgCannes · 47.5 kgMadrid · 310 kgNefta · 541 kg

By rail or ferry By air

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

What the 15-hour limit costs: at this budget Andujar can only be reached by air — 376 kg CO₂e, in 5h 30m. Allow up to 24 hours and the train does the same journey for 62.1 kg in 23h 30m — 6× less carbon for 18h more travelling.

July from Cardiff — 18 destinations on the frontier, 11 without flying.
DestinationHowCO₂e returnTempSun/dayRain/dayJourney
Portsmouth, United KingdomRail13.2 kg17.2 °C10.9 h3.0 mm3h 54m
Dunkirk, FranceRail22.4 kg17.9 °C11.2 h2.7 mm8h 18m
Amiens, FranceRail24.3 kg18.7 °C10.8 h2.4 mm8h 48m
Paris, FranceRail27.1 kg20.0 °C11.2 h2.6 mm7h 42m
Mainz, GermanyRail35.1 kg20.7 °C11.6 h3.9 mm12h 36m
Chalon-sur-Saône, FranceRail35.8 kg21.2 °C12.4 h2.9 mm12h 12m
Lyon, FranceRail38.7 kg22.5 °C13.0 h3.1 mm10h 54m
Romans-sur-Isère, FranceRail41.0 kg23.5 °C13.7 h1.6 mm12h 42m
Orange, FranceRail43.5 kg25.3 °C13.7 h0.9 mm12h 42m
Nîmes, FranceRail44.0 kg25.5 °C13.5 h0.8 mm12h 6m
Cannes, FranceRail47.5 kg26.4 °C14.3 h0.2 mm14h 48m
Madrid, SpainAir310 kg28.1 °C14.0 h0.0 mm5h 6m
Aranjuez, SpainAir320 kg28.9 °C14.0 h0.0 mm5h 12m
Andujar, SpainAir376 kg30.9 °C13.6 h0.0 mm5h 30m
Kairouan, TunisiaAir516 kg32.8 °C12.9 h0.0 mm6h 12m
Ar Rudayyif, TunisiaAir530 kg33.3 °C12.9 h0.0 mm6h 18m
Metlaoui, TunisiaAir534 kg34.3 °C12.9 h0.0 mm6h 18m
Nefta, TunisiaAir541 kg36.0 °C12.9 h0.0 mm6h 24m

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 (47.5 kg, 26.4 °C) to Madrid (310 kg, 28.1 °C) buys 1.7 °C more warmth for an extra 262 kg — 154 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 return17.2 °C · 10.9 h sun · 3h 54m by railwarm but wetCannes, FranceCannesFrance47.5 kg CO₂e return26.4 °C · 14.3 h sun · 14h 48m by railwarm, bright and dryNefta, TunisiaNeftaTunisia541 kg CO₂e return36.0 °C · 12.9 h sun · 6h 24m by airwarm, bright and dry

The same month, asked differently

July 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 Nefta

Places to stay in Nefta, Tunisia, on a live map. Prices and availability come from Stay22 and its booking partners.

Search places to stay in Nefta →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

July from elsewhere

Photo credits

Questions

Where is the warmest place to go from Cardiff in July?

Nefta, Tunisia, at 36.0 °C. Reaching it emits 541 kg CO₂e return, travelling 6h 24m each way by air (modelled).

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

Yes. Cannes reaches 26.4 °C and is reachable by rail or ferry in 14h 48m (modelled), emitting 47.5 kg CO₂e return — though Nefta is warmer still, if you fly.

How much carbon does a return trip from Cardiff to Nefta produce?

541 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.