London · July · warmth

Warmest places to go from London in July

The warmest place you can reach from London in July within 15 hours is Zagora at 36.6 °C, costing 604 kg CO₂e return. The lowest-carbon option is Calais at 4.5 kg — 134× less carbon for 18.8 °C less.

Every destination here is on the efficiency frontier: nowhere else in Europe is both warmer in July 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, July, departing London. Journeys of up to 15 hours each way.

What the 15-hour limit costs: at this budget Andujar can only be reached by air — 385 kg CO₂e, in 5h 30m. Allow up to 24 hours and the train does the same journey for 45.1 kg in 22h 54m — 9× less carbon for 17h 24m more travelling.

July from London — 18 destinations on the frontier, 9 without flying.
Destination	How	CO₂e return	Temp	Sun/day	Rain/day	Journey
Calais, France	Rail	4.5 kg	17.8 °C	11.1 h	2.4 mm	4h 6m
Amiens, France	Rail	7.3 kg	18.7 °C	10.8 h	2.4 mm	5h 24m
Paris, France	Rail	10.2 kg	20.0 °C	11.2 h	2.6 mm	6h 42m
Bourges, France	Rail	15.5 kg	20.3 °C	11.4 h	2.7 mm	9h 12m
Chalon-sur-Saône, France	Rail	18.8 kg	21.2 °C	12.4 h	2.9 mm	10h 42m
Lyon, France	Rail	21.8 kg	22.5 °C	13.0 h	3.1 mm	12h 6m
Romans-sur-Isère, France	Rail	24.0 kg	23.5 °C	13.7 h	1.6 mm	13h 6m
Orange, France	Rail	26.5 kg	25.3 °C	13.7 h	0.9 mm	14h 18m
Avignon, France	Rail	27.1 kg	25.4 °C	13.7 h	1.0 mm	14h 36m
Zaragoza, Spain	Air	276 kg	27.1 °C	13.7 h	0.2 mm	5h
Lleida, Spain	Air	277 kg	27.6 °C	13.6 h	1.5 mm	5h
Aranjuez, Spain	Air	328 kg	28.9 °C	14.0 h	0.0 mm	5h 12m
Andujar, Spain	Air	385 kg	30.9 °C	13.6 h	0.0 mm	5h 30m
Kairouan, Tunisia	Air	488 kg	32.8 °C	12.9 h	0.0 mm	6h 6m
Gafsa, Tunisia	Air	511 kg	33.3 °C	12.9 h	0.0 mm	6h 12m
Metlaoui, Tunisia	Air	511 kg	34.3 °C	12.9 h	0.0 mm	6h 12m
Tozeur, Tunisia	Air	520 kg	35.6 °C	13.0 h	0.0 mm	6h 18m
Zagora, Morocco	Air	604 kg	36.6 °C	12.1 h	0.0 mm	6h 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 Avignon (27.1 kg, 25.4 °C) to Zaragoza (276 kg, 27.1 °C) buys 1.7 °C more warmth for an extra 249 kg — 146 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 return17.8 °C · 11.1 h sun · 4h 6m by railwarm overall AvignonFrance27.1 kg CO₂e return25.4 °C · 13.7 h sun · 14h 36m by railwarm, bright and dry ZagoraMorocco604 kg CO₂e return36.6 °C · 12.1 h sun · 6h 42m by airwarm, bright and dry

If you'd rather have sunshine than heat

July answers differently depending on what you're after. The sunniest destinations from London in July are a different list — the brightest places are not always the hottest, and in winter the difference is large.

Where to stay in Zagora

Places to stay in Zagora, Morocco, 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

July from elsewhere

Questions

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

Zagora, Morocco, at 36.6 °C. Reaching it emits 604 kg CO₂e return, travelling 6h 42m each way by air.

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

Yes. Avignon reaches 25.4 °C and is reachable by rail or ferry in 14h 36m, emitting 27.1 kg CO₂e return — though Zagora is warmer still, if you fly.

How much carbon does a return trip from London to Zagora produce?

604 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.