Sunniest places to go from Cardiff in June
The sunniest place you can reach from Cardiff in June within 15 hours is Rauma at 16.1 h, costing 464 kg CO₂e return. The lowest-carbon option is Reading at 12.3 kg — 38× less carbon for 3.3 h less.
Every destination here is on the efficiency frontier: nowhere else in Europe is both sunnier in June and lower in carbon. Anything a better option beats outright has been left out.
By rail or ferry By air
What the 15-hour limit costs: at this budget Nyköping can only be reached by air — 379 kg CO₂e, in 5h 30m. Allow up to 24 hours and the train does the same journey for 56.8 kg in 23h 18m — 7× less carbon for 17h 48m more travelling.
| Destination | How | CO₂e return | Temp | Sun/day | Rain/day | Journey |
|---|---|---|---|---|---|---|
| Reading, United Kingdom | Rail | 12.3 kg | 16.5 °C | 12.8 h | 1.0 mm | 4h 6m |
| Portsmouth, United Kingdom | Rail | 13.2 kg | 16.6 °C | 13.7 h | 1.1 mm | 4h 12m |
| Aalborg, Denmark | Air | 264 kg | 15.8 °C | 14.3 h | 2.4 mm | 4h 54m |
| Nyköping, Sweden | Air | 379 kg | 16.1 °C | 14.8 h | 2.1 mm | 5h 30m |
| Gävle, Sweden | Air | 405 kg | 16.3 °C | 15.5 h | 1.8 mm | 5h 36m |
| Rauma, Finland | Air | 464 kg | 15.7 °C | 16.1 h | 2.0 mm | 6h |
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
If you'd rather have heat than sunshine
June answers differently depending on what you're after. The warmest destinations from Cardiff in June are a different list — hours of sunshine and degrees of warmth come apart, especially early and late in the year.
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.
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
- Amsterdam
- Barcelona
- Berlin
- Birmingham
- Bristol
- Brussels
- Cardiff
- Copenhagen
- Dublin
- Edinburgh
- Frankfurt
- Glasgow
- Leeds
- Lisbon
- Liverpool
- London
- Madrid
- Manchester
- Milan
- Munich
- Newcastle
- Nottingham
- Oslo
- Paris
- Prague
- Rome
- Sheffield
- Southampton
- Stockholm
- Vienna
- Warsaw
- Zurich
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.
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 4h 12m, 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.