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Southampton · July · relief from the heat

Coolest places to go from Southampton in July

In July, the coolest well-known place within 15 hours of Southampton is Reykjavik, Iceland, 6.0 °C cooler than Southampton and 9.5 h sun a day, about 6h each way by air. Without flying, it is Aberdeen, United Kingdom, 3.2 °C cooler than Southampton, about 11h 12m each way by train, for about 9× less carbon (55.9 kg CO₂e return against 477 kg).

The 10 coolest places within 15 hours of Southampton

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

  1. Reykjavik, Iceland6.0 °C cooler · 9.5 h sun a day · 2.9 mm rain a day · sea 11.1 °Cair ≈ 6h · 477 kg CO₂e return
  2. Sligo, Ireland3.3 °C cooler · 7.8 h sun a day · 6.3 mm rain a day · sea 15.5 °Cair ≈ 4h 18m · 152 kg CO₂e return
  3. Aberdeen, United Kingdom3.2 °C cooler · 10.7 h sun a day · 4.2 mm rain a day · sea 12.8 °Crail ≈ 11h 12m · 55.9 kg CO₂e return
  4. Douglas, Isle of Man3.1 °C cooler · 10.2 h sun a day · 5.2 mm rain a day · sea 14.2 °Cair ≈ 4h 6m · 105 kg CO₂e return
  5. Bergen, Norway2.8 °C cooler · 9.2 h sun a day · 7.7 mm rain a day · sea 15.1 °Cair ≈ 5h · 286 kg CO₂e return
  6. Oldham, United Kingdom2.7 °C cooler · 9.4 h sun a day · 5.2 mm rain a dayrail ≈ 5h 48m · 23.9 kg CO₂e return
  7. Belfast, United Kingdom2.7 °C cooler · 9.5 h sun a day · 4.2 mm rain a dayair ≈ 4h 12m · 234 kg CO₂e return
  8. Tralee, Ireland2.7 °C cooler · 8.6 h sun a day · 5.6 mm rain a dayair ≈ 4h 18m · 149 kg CO₂e return
  9. Östersund, Sweden2.6 °C cooler · 12.0 h sun a day · 4.4 mm rain a dayair ≈ 5h 42m · 419 kg CO₂e return
  10. Haugesund, Norway2.5 °C cooler · 10.8 h sun a day · 7.0 mm rain a day · sea 15.2 °Cair ≈ 4h 54m · 261 kg CO₂e return

Without flying

The coolest places the train reaches within 15 hours. Aberdeen is 3.2 °C cooler for 55.9 kg — about 9× less carbon than flying to Reykjavik.

  1. Aberdeen, United Kingdom3.2 °C cooler · 10.7 h sun a day · 4.2 mm rain a day · sea 12.8 °Crail ≈ 11h 12m · 55.9 kg CO₂e return
  2. Dundee, United Kingdom3.0 °C cooler · 10.4 h sun a day · 2.9 mm rain a day · sea 13.2 °Crail ≈ 10h · 50.4 kg CO₂e return
  3. Oldham, United Kingdom2.7 °C cooler · 9.4 h sun a day · 5.2 mm rain a dayrail ≈ 5h 48m · 23.9 kg CO₂e return
  4. Glasgow, United Kingdom2.6 °C cooler · 10.0 h sun a day · 4.1 mm rain a dayrail ≈ 8h 42m · 46.9 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 Southampton in July within 15 hours is Reykjavik, 6.0 °C cooler, costing 477 kg CO₂e return. The lowest-carbon option is Ebbw Vale at 12.7 kg — 38× less carbon, for 2.8 degrees less relief from the heat.

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

Ebbw ValeReykjavik
Where they are. Solid lines are rail or ferry, dashed are flights, from Southampton. Pick one to compare.
Carbon against relief from the heat, July, departing Southampton. Journeys of up to 15 hours each way.2 destinations. Lowest carbon Ebbw Vale at 12.7 kilograms and 3.2 °C cooler; best for relief from the heat Reykjavik at 477 kilograms and 6.0 °C cooler. Ebbw Vale · 12.7 kgReykjavik · 477 kg

By rail or ferry By air

Carbon against relief from the heat, July, departing Southampton. Journeys of up to 15 hours each way.
July from Southampton — 2 destinations on the frontier, 1 without flying.
DestinationHowCO₂e returnTempSun/dayRain/dayJourney
Ebbw Vale, United KingdomRail12.7 kg13.7 °C9.4 h4.4 mm3h 48m
Reykjavik, IcelandAir477 kg10.9 °C9.5 h2.9 mm6h

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 Ebbw Vale (12.7 kg, 3.2 °C cooler) to Reykjavik (477 kg, 6.0 °C cooler) buys 2.8 °C more relief from the heat for an extra 464 kg — 166 kg of CO₂e per degree. That single step is the most expensive relief from the heat on the whole curve.

The pick of them

Ebbw Vale, United KingdomEbbw ValeUnited Kingdom12.7 kg CO₂e return13.7 °C · 9.4 h sun · 3h 48m by railmild and brightReykjavik, IcelandReykjavikIceland477 kg CO₂e return10.9 °C · 9.5 h sun · 6h by airmild and bright

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 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 Southampton

July from elsewhere

Photo credits

Questions

Where is the coolest place to go from Southampton in July?

Reykjavik, Iceland, at 6.0 °C cooler. Reaching it emits 477 kg CO₂e return, travelling 6h each way by air (modelled).

Can I get somewhere cool from Southampton in July without flying?

Yes. Ebbw Vale reaches 3.2 °C cooler and is reachable by rail or ferry in 3h 48m (modelled), emitting 12.7 kg CO₂e return — though Reykjavik is cooler still, if you fly.

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

477 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.