Madrid · August · relief from the heat

Coolest places to go from Madrid in August

In August, the coolest well-known place within 15 hours of Madrid is Reykjavik, Iceland, 17.5 °C cooler than Madrid and 8.6 h sun a day, about 7h 24m each way by air. Without flying, it is Brest, France, 10.9 °C cooler than Madrid, about 14h 6m each way by train, for about 28× less carbon (26.2 kg CO₂e return against 727 kg).

The 10 coolest places within 15 hours of Madrid

Ranked on relief from the heat in August 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 relief from the heat each extra kilogram buys.

Reykjavik, Iceland17.5 °C cooler · 8.6 h sun a day · 3.8 mm rain a day · sea 12.0 °Cair ≈ 7h 24m · 727 kg CO₂e return
Bergen, Norway14.5 °C cooler · 6.6 h sun a day · 11.7 mm rain a day · sea 15.7 °Cair ≈ 6h 36m · 580 kg CO₂e return
Östersund, Sweden14.4 °C cooler · 10.0 h sun a day · 5.1 mm rain a dayair ≈ 7h 12m · 705 kg CO₂e return
Sligo, Ireland13.9 °C cooler · 8.7 h sun a day · 6.6 mm rain a day · sea 16.0 °Cair ≈ 5h 36m · 398 kg CO₂e return
Douglas, Isle of Man13.7 °C cooler · 10.1 h sun a day · 4.1 mm rain a day · sea 15.5 °Cair ≈ 5h 30m · 384 kg CO₂e return
Haugesund, Norway13.7 °C cooler · 8.7 h sun a day · 8.6 mm rain a day · sea 15.9 °Cair ≈ 6h 24m · 554 kg CO₂e return
Oldham, United Kingdom13.6 °C cooler · 9.2 h sun a day · 3.6 mm rain a dayair ≈ 5h 30m · 368 kg CO₂e return
Glasgow, United Kingdom13.6 °C cooler · 9.5 h sun a day · 5.1 mm rain a dayair ≈ 5h 48m · 432 kg CO₂e return
Ålesund, Norway13.6 °C cooler · 7.5 h sun a day · 6.3 mm rain a day · sea 15.1 °Cair ≈ 6h 54m · 639 kg CO₂e return
Belfast, United Kingdom13.4 °C cooler · 10.0 h sun a day · 4.1 mm rain a dayair ≈ 5h 36m · 399 kg CO₂e return

Without flying

The coolest places the train reaches within 15 hours. Brest is 10.9 °C cooler for 26.2 kg — about 28× less carbon than flying to Reykjavik.

Brest, France10.9 °C cooler · 10.1 h sun a day · 3.1 mm rain a day · sea 16.0 °Crail ≈ 14h 6m · 26.2 kg CO₂e return
Quimper, France10.6 °C cooler · 10.0 h sun a day · 2.4 mm rain a day · sea 17.3 °Crail ≈ 13h 36m · 24.9 kg CO₂e return
La Chaux-de-Fonds, Switzerland10.4 °C cooler · 10.9 h sun a day · 2.8 mm rain a dayrail ≈ 14h 18m · 33.2 kg CO₂e return
Lorient, France10.0 °C cooler · 10.8 h sun a day · 1.8 mm rain a day · sea 18.1 °Crail ≈ 13h 30m · 24.1 kg CO₂e return
Rouen, France9.7 °C cooler · 10.5 h sun a day · 2.2 mm rain a dayrail ≈ 14h 18m · 31.6 kg CO₂e return
Brussels, Belgium9.4 °C cooler · 10.7 h sun a day · 1.9 mm rain a dayrail ≈ 14h 36m · 38.8 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 coolest place you can reach from Madrid in August within 15 hours is Reykjavik, 17.5 °C cooler, costing 727 kg CO₂e return. The lowest-carbon option is Valladolid at 4.8 kg — 151× less carbon, for 14.0 degrees less relief from the heat.

Every destination here is on the efficiency frontier: nowhere else this site covers is both cooler in August 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 Madrid. Pick one to compare.

By rail or ferry By air

Carbon against relief from the heat, August, departing Madrid. Journeys of up to 15 hours each way.

August from Madrid — 11 destinations on the frontier, 7 without flying.
Destination	How	CO₂e return	Temp	Sun/day	Rain/day	Journey
Valladolid, Spain	Rail	4.8 kg	24.7 °C	12.7 h	0.3 mm	2h 30m
Soria, Spain	Rail	5.4 kg	22.4 °C	12.6 h	0.5 mm	4h 6m
Burgos, Spain	Rail	6.3 kg	21.3 °C	12.3 h	0.4 mm	4h 36m
Vitoria-Gasteiz, Spain	Rail	8.4 kg	20.2 °C	11.0 h	0.8 mm	5h 36m
Oviedo, Spain	Rail	11.0 kg	19.1 °C	8.7 h	1.6 mm	4h 48m
Lorient, France	Rail	24.1 kg	18.2 °C	10.8 h	1.8 mm	13h 30m
Brest, France	Rail	26.2 kg	17.3 °C	10.1 h	3.1 mm	14h 6m
Truro, United Kingdom	Air	277 kg	16.3 °C	8.6 h	3.5 mm	5h
Rhondda, United Kingdom	Air	315 kg	14.9 °C	8.6 h	4.9 mm	5h 12m
Ebbw Vale, United Kingdom	Air	318 kg	14.1 °C	8.6 h	3.7 mm	5h 12m
Reykjavik, Iceland	Air	727 kg	10.7 °C	8.6 h	3.8 mm	7h 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 Brest (26.2 kg, 10.9 °C cooler) to Truro (277 kg, 11.9 °C cooler) buys 1.0 °C more relief from the heat for an extra 251 kg — 251 kg of CO₂e per degree. That single step is the most expensive relief from the heat on the whole curve.

The pick of them

ValladolidSpain4.8 kg CO₂e return24.7 °C · 12.7 h sun · 2h 30m by railwarm, bright and dry

BrestFrance26.2 kg CO₂e return17.3 °C · 10.1 h sun · 14h 6m by railwarm but wet

ReykjavikIceland727 kg CO₂e return10.7 °C · 8.6 h sun · 7h 24m by airmild and bright

The same month, asked differently

August 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 Reykjavik

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

Search places to stay in Reykjavik →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 Madrid

August from elsewhere

Photo credits

Brest: Thesupermat, CC BY-SA 3.0, via Wikimedia Commons
Reykjavik: Hedwig Storch, CC BY-SA 3.0, via Wikimedia Commons
Bergen: W. Bulach, CC BY-SA 4.0, via Wikimedia Commons
Östersund: Lars Falkdalen Lindahl (User:Njaelkies Lea), CC BY-SA 3.0, via Wikimedia Commons
Sligo: Gerd Eichmann, CC BY-SA 4.0, via Wikimedia Commons
Douglas: Jim Linwood, CC BY 2.0, via Wikimedia Commons
Haugesund: Efarestv, CC BY-SA 3.0, via Wikimedia Commons
Oldham: Matt from Oldham, UK, CC BY 2.0, via Wikimedia Commons
Glasgow: 瑞丽江的河水, CC BY-SA 4.0, via Wikimedia Commons
Ålesund: Holger Uwe Schmitt, CC BY-SA 4.0, via Wikimedia Commons
Quimper: Renegade at Dutch Wikipedia, Public domain, via Wikimedia Commons
Lorient: The original uploader was Jackmame at French Wikipedia., CC BY-SA 2.5, via Wikimedia Commons
Brussels: Ank Kumar, CC BY-SA 4.0, via Wikimedia Commons

Questions

Where is the coolest place to go from Madrid in August?

Reykjavik, Iceland, at 17.5 °C cooler. Reaching it emits 727 kg CO₂e return, travelling 7h 24m each way by air (modelled).

Can I get somewhere cool from Madrid in August without flying?

Yes. Brest reaches 10.9 °C cooler and is reachable by rail or ferry in 14h 6m (modelled), emitting 26.2 kg CO₂e return — though Reykjavik is cooler still, if you fly.

How much carbon does a return trip from Madrid to Reykjavik produce?

727 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.