Warsaw · August · relief from the heat

Coolest places to go from Warsaw in August

In August, the coolest well-known place within 15 hours of Warsaw is Reykjavik, Iceland, 10.3 °C cooler than Warsaw and 8.6 h sun a day, about 7h 12m each way by air. Without flying, it is Jönköping, Sweden, 5.0 °C cooler than Warsaw, about 12h 24m each way by train, for about 31× less carbon (22.3 kg CO₂e return against 697 kg).

The 10 coolest places within 15 hours of Warsaw

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, Iceland10.3 °C cooler · 8.6 h sun a day · 3.8 mm rain a day · sea 12.0 °Cair ≈ 7h 12m · 697 kg CO₂e return
Bergen, Norway7.3 °C cooler · 6.6 h sun a day · 11.7 mm rain a day · sea 15.7 °Cair ≈ 5h 18m · 332 kg CO₂e return
Östersund, Sweden7.2 °C cooler · 10.0 h sun a day · 5.1 mm rain a dayair ≈ 5h 12m · 320 kg CO₂e return
Sligo, Ireland6.7 °C cooler · 8.7 h sun a day · 6.6 mm rain a day · sea 16.0 °Cair ≈ 6h 6m · 493 kg CO₂e return
Douglas, Isle of Man6.5 °C cooler · 10.1 h sun a day · 4.1 mm rain a day · sea 15.5 °Cair ≈ 5h 48m · 428 kg CO₂e return
Haugesund, Norway6.5 °C cooler · 8.7 h sun a day · 8.6 mm rain a day · sea 15.9 °Cair ≈ 5h 12m · 317 kg CO₂e return
Oldham, United Kingdom6.4 °C cooler · 9.2 h sun a day · 3.6 mm rain a dayair ≈ 5h 36m · 390 kg CO₂e return
Glasgow, United Kingdom6.4 °C cooler · 9.5 h sun a day · 5.1 mm rain a dayair ≈ 5h 48m · 425 kg CO₂e return
Ålesund, Norway6.4 °C cooler · 7.5 h sun a day · 6.3 mm rain a day · sea 15.1 °Cair ≈ 5h 24m · 362 kg CO₂e return
Belfast, United Kingdom6.2 °C cooler · 10.0 h sun a day · 4.1 mm rain a dayair ≈ 5h 54m · 451 kg CO₂e return

Without flying

The coolest places the train reaches within 15 hours. Jönköping is 5.0 °C cooler for 22.3 kg — about 31× less carbon than flying to Reykjavik.

Jönköping, Sweden5.0 °C cooler · 9.1 h sun a day · 3.5 mm rain a dayrail ≈ 12h 24m · 22.3 kg CO₂e return
Herning, Denmark4.9 °C cooler · 9.9 h sun a day · 3.2 mm rain a dayrail ≈ 14h 36m · 26.4 kg CO₂e return
Gothenburg, Sweden4.8 °C cooler · 9.8 h sun a day · 5.3 mm rain a day · sea 17.8 °Crail ≈ 13h 36m · 24.7 kg CO₂e return
Vejle, Denmark4.6 °C cooler · 10.2 h sun a day · 3.5 mm rain a day · sea 17.3 °Crail ≈ 13h 48m · 24.9 kg CO₂e return
Aalborg, Denmark4.5 °C cooler · 9.9 h sun a day · 3.9 mm rain a dayrail ≈ 14h 36m · 26.3 kg CO₂e return
Västerås, Sweden4.5 °C cooler · 10.1 h sun a day · 4.1 mm rain a dayrail ≈ 14h 12m · 25.6 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 Warsaw in August within 15 hours is Reykjavik, 10.3 °C cooler, costing 697 kg CO₂e return. The lowest-carbon option is Chojnice at 8.4 kg — 83× less carbon, for 8.0 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 Warsaw. Pick one to compare.

By rail or ferry By air

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

What the 15-hour limit costs: at this budget Östersund can only be reached by air — 320 kg CO₂e, in 5h 12m. Allow up to 24 hours and the train does the same journey for 37.6 kg in 20h 6m — 9× less carbon for 14h 54m more travelling.

August from Warsaw — 6 destinations on the frontier, 4 without flying.
Destination	How	CO₂e return	Temp	Sun/day	Rain/day	Journey
Chojnice, Poland	Rail	8.4 kg	18.7 °C	11.0 h	2.4 mm	5h 36m
Karlskrona, Sweden	Rail	16.6 kg	17.1 °C	10.7 h	2.2 mm	9h 36m
Vaxjo, Sweden	Rail	19.3 kg	16.2 °C	9.4 h	3.5 mm	10h 54m
Borås, Sweden	Rail	23.5 kg	15.2 °C	8.8 h	4.4 mm	13h
Östersund, Sweden	Air	320 kg	13.8 °C	10.0 h	5.1 mm	5h 12m
Reykjavik, Iceland	Air	697 kg	10.7 °C	8.6 h	3.8 mm	7h 12m

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 Borås (23.5 kg, 5.8 °C cooler) to Östersund (320 kg, 7.2 °C cooler) buys 1.4 °C more relief from the heat for an extra 297 kg — 212 kg of CO₂e per degree. That single step is the most expensive relief from the heat on the whole curve.

The pick of them

ChojnicePoland8.4 kg CO₂e return18.7 °C · 11.0 h sun · 5h 36m by railwarm overall

BoråsSweden23.5 kg CO₂e return15.2 °C · 8.8 h sun · 13h by railwarm but wet

ReykjavikIceland697 kg CO₂e return10.7 °C · 8.6 h sun · 7h 12m 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 Warsaw

August from elsewhere

Photo credits

Chojnice: Frania Hermiona, CC BY-SA 4.0, via Wikimedia Commons
Borås: Amjad Sheikh, 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
Jönköping: Citronlemonad, CC0, via Wikimedia Commons
Herning: Hubertus, CC BY 2.5, via Wikimedia Commons
Gothenburg: Bengt Nyman from Vaxholm, Sweden, CC BY 2.0, via Wikimedia Commons
Vejle: Hjart, CC BY-SA 4.0, via Wikimedia Commons
Västerås: Einarspetz, CC BY-SA 4.0, via Wikimedia Commons

Questions

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

Reykjavik, Iceland, at 10.3 °C cooler. Reaching it emits 697 kg CO₂e return, travelling 7h 12m each way by air (modelled).

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

Yes. Borås reaches 5.8 °C cooler and is reachable by rail or ferry in 13h (modelled), emitting 23.5 kg CO₂e return — though Reykjavik is cooler still, if you fly.

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

697 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.