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Cardiff · June · sunshine

Sunniest places to go from Cardiff in June

In June, the sunniest well-known place within 15 hours of Cardiff is Helsinki, Finland, 16.0 h of sun a day and 16.2 °C, about 6h 6m each way by air. Without flying, it is Brighton, United Kingdom, 13.8 h of sun a day, about 4h 42m each way by train, for about 28× less carbon (18.0 kg CO₂e return against 499 kg).

The 10 sunniest places within 15 hours of Cardiff

Ranked on sunshine in June 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 sunshine each extra kilogram buys.

  1. Helsinki, Finland16.0 h · 16.2 °C · mostly dry · sea 13.5 °Cair ≈ 6h 6m · 499 kg CO₂e return
  2. Oulu, Finland15.9 h · 15.3 °C · 1.9 mm rain a day · sea 15.4 °Cair ≈ 6h 30m · 558 kg CO₂e return
  3. Porvoo, Finland15.9 h · 17.1 °C · mostly dryair ≈ 6h 12m · 510 kg CO₂e return
  4. Luleå, Sweden15.8 h · 15.1 °C · 1.2 mm rain a day · sea 12.6 °Cair ≈ 6h 18m · 534 kg CO₂e return
  5. Tallinn, Estonia15.7 h · 16.4 °C · 2.2 mm rain a day · sea 13.7 °Cair ≈ 6h 6m · 491 kg CO₂e return
  6. Narva, Estonia15.7 h · 16.9 °C · 2.2 mm rain a dayair ≈ 6h 24m · 538 kg CO₂e return
  7. Gävle, Sweden15.5 h · 16.3 °C · 1.8 mm rain a day · sea 12.5 °Cair ≈ 5h 36m · 405 kg CO₂e return
  8. Umeå, Sweden15.3 h · 15.0 °C · 1.5 mm rain a day · sea 10.7 °Cair ≈ 6h 6m · 487 kg CO₂e return
  9. Tartu, Estonia14.9 h · 17.4 °C · 1.4 mm rain a dayair ≈ 6h 12m · 513 kg CO₂e return
  10. Oslo, Norway14.3 h · 16.5 °C · 3.3 mm rain a dayair ≈ 5h 12m · 321 kg CO₂e return

Without flying

The sunniest places the train reaches within 15 hours. Brighton is 13.8 h for 18.0 kg — about 28× less carbon than flying to Helsinki.

  1. Brighton, United Kingdom13.8 h · 15.9 °C · 1.5 mm rain a day · sea 14.3 °Crail ≈ 4h 42m · 18.0 kg CO₂e return
  2. Portsmouth, United Kingdom13.7 h · 16.6 °C · mostly dry · sea 15.3 °Crail ≈ 3h 54m · 13.2 kg CO₂e return
  3. Toulon, France13.6 h · 22.1 °C · 1.6 mm rain a day · sea 21.1 °Crail ≈ 13h · 47.6 kg CO₂e return
  4. Hastings, United Kingdom13.5 h · 16.1 °C · 1.3 mm rain a day · sea 14.6 °Crail ≈ 5h 24m · 21.8 kg CO₂e return
  5. Canterbury, United Kingdom13.3 h · 16.0 °C · mostly dry · sea 15.7 °Crail ≈ 5h 36m · 23.8 kg CO₂e return
  6. Nice, France13.3 h · 21.6 °C · 2.0 mm rain a day · sea 21.8 °Crail ≈ 14h 48m · 47.3 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 sunniest place you can reach from Cardiff in June within 15 hours is Rauma, 16.1 h, costing 464 kg CO₂e return. The lowest-carbon option is Reading at 12.3 kg — 38× less carbon, for 3.3 hours less sunshine.

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

ReadingRauma
Where they are. Solid lines are rail or ferry, dashed are flights, from Cardiff. Pick one to compare.
Carbon against sunshine, June, departing Cardiff. Journeys of up to 15 hours each way.6 destinations. Lowest carbon Reading at 12.3 kilograms and 12.8 h; best for sunshine Rauma at 464 kilograms and 16.1 h. Reading · 12.3 kgPortsmouth · 13.2 kgAalborg · 264 kgRauma · 464 kg

By rail or ferry By air

Carbon against sunshine, June, departing Cardiff. Journeys of up to 15 hours each way.

What the 15-hour limit costs: at this budget Aalborg can only be reached by air — 264 kg CO₂e, in 4h 54m. Allow up to 24 hours and the train does the same journey for 43.4 kg in 19h 12m — 6× less carbon for 14h 18m more travelling.

June from Cardiff — 6 destinations on the frontier, 2 without flying.
DestinationHowCO₂e returnTempSun/dayRain/dayJourney
Reading, United KingdomRail12.3 kg16.5 °C12.8 h1.0 mm3h 42m
Portsmouth, United KingdomRail13.2 kg16.6 °C13.7 h1.1 mm3h 54m
Aalborg, DenmarkAir264 kg15.8 °C14.3 h2.4 mm4h 54m
Västerås, SwedenAir384 kg17.0 °C15.2 h1.8 mm5h 30m
Gävle, SwedenAir405 kg16.3 °C15.5 h1.8 mm5h 36m
Rauma, FinlandAir464 kg15.7 °C16.1 h2.0 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 Portsmouth (13.2 kg, 13.7 h) to Aalborg (264 kg, 14.3 h) buys 0.6 hours more sunshine for an extra 251 kg — 418 kg of CO₂e per hour. That single step is the most expensive sunshine on the whole curve.

The pick of them

Reading, United KingdomReadingUnited Kingdom12.3 kg CO₂e return16.5 °C · 12.8 h sun · 3h 42m by railwarm, bright and dryPortsmouth, United KingdomPortsmouthUnited Kingdom13.2 kg CO₂e return16.6 °C · 13.7 h sun · 3h 54m by railwarm, bright and dryRauma, FinlandRaumaFinland464 kg CO₂e return15.7 °C · 16.1 h sun · 6h by airwarm overall

The same month, asked differently

June 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 Rauma

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

Search places to stay in Rauma →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

June from elsewhere

Photo credits

Questions

Where is the sunniest place to go from Cardiff in June?

Rauma, Finland, at 16.1 h. Reaching it emits 464 kg CO₂e return, travelling 6h each way by air (modelled).

Can I get somewhere sunny from Cardiff in June without flying?

Yes. Portsmouth reaches 13.7 h and is reachable by rail or ferry in 3h 54m (modelled), emitting 13.2 kg CO₂e return — though Rauma is sunnier still, if you fly.

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

464 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.