Rennes
Reaching Rennes from London emits 11.6 kg CO₂e return by rail (7h 12m each way) against 99.0 kg by air — 9× the carbon. It averages 18.9 °C in August and 5.9 °C in January.
Rennes is the chief city of Brittany in northwest France. — Wikivoyage, CC BY-SA 4.0
When to go: Rennes is warmest in August (18.9 °C), sunniest in June (12.4 h a day); coldest in January (5.9 °C). Month by month
Getting there
| From | Distance | By rail | Rail time | By air | Air time |
|---|---|---|---|---|---|
| Amsterdam | 665 km | 19.6 kg | 7h 42m | 167 kg | 4h 24m |
| Barcelona | 806 km | 23.8 kg | 11h | 203 kg | 4h 36m |
| Berlin | 1,175 km | 34.7 kg | 13h | 296 kg | 5h 6m |
| Birmingham | 486 km | 24.7 kg | 10h | 122 kg | 4h 6m |
| Bristol | 378 km | 25.4 kg | 10h 12m | 95.0 kg | 4h |
| Brussels | 531 km | 15.7 kg | 5h 42m | 134 kg | 4h 12m |
| Cardiff | 390 km | 28.6 kg | 10h 36m | 98.1 kg | 4h |
| Copenhagen | 1,285 km | 37.9 kg | 18h 30m | 323 kg | 5h 12m |
| Dublin | 664 km | — | — | 167 kg | 4h 24m |
| Edinburgh | 878 km | 54.5 kg | 13h | 221 kg | 4h 42m |
| Frankfurt | 785 km | 23.2 kg | 8h | 198 kg | 4h 30m |
| Glasgow | 880 km | 56.3 kg | 13h 12m | 221 kg | 4h 42m |
| Leeds | 632 km | 33.5 kg | 10h 54m | 159 kg | 4h 18m |
| Lisbon | 1,204 km | 35.5 kg | 19h 12m | 303 kg | 5h 6m |
| Liverpool | 596 km | 34.6 kg | 10h 54m | 150 kg | 4h 18m |
| London | 394 km | 11.6 kg | 7h 12m | 99.0 kg | 4h |
| Madrid | 871 km | 25.7 kg | 14h 18m | 219 kg | 4h 42m |
| Manchester | 598 km | 32.7 kg | 10h 48m | 151 kg | 4h 18m |
| Milan | 877 km | 25.9 kg | 11h 18m | 221 kg | 4h 42m |
| Munich | 982 km | 29.0 kg | 10h 6m | 247 kg | 4h 48m |
| Newcastle | 763 km | 43.6 kg | 11h 30m | 192 kg | 4h 30m |
| Nottingham | 540 km | 25.7 kg | 10h 24m | 136 kg | 4h 12m |
| Oslo | 1,537 km | 45.4 kg | 24h 12m | 387 kg | 5h 30m |
| Paris | 308 km | 9.1 kg | 2h 54m | 77.4 kg | 3h 54m |
| Prague | 1,190 km | 35.1 kg | 16h 54m | 299 kg | 5h 6m |
| Rome | 1,309 km | 38.6 kg | 15h 18m | 329 kg | 5h 12m |
| Sheffield | 586 km | 29.9 kg | 10h 42m | 148 kg | 4h 18m |
| Southampton | 311 km | 20.6 kg | 10h | 78.3 kg | 3h 54m |
| Stockholm | 1,788 km | 52.8 kg | 24h 48m | 450 kg | 5h 54m |
| Vienna | 1,336 km | 39.4 kg | 15h 12m | 336 kg | 5h 18m |
| Warsaw | 1,672 km | 49.3 kg | 20h 30m | 420 kg | 5h 42m |
| Zurich | 768 km | 22.7 kg | 8h 24m | 193 kg | 4h 30m |
The year in Rennes
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp °C | 5.9 | 7.7 | 8.9 | 10.6 | 14.1 | 17.9 | 18.2 | 18.9 | 17.2 | 13.9 | 9.8 | 7.8 |
| Sun h/day | 5.1 | 4.9 | 6.9 | 8.8 | 10.9 | 12.4 | 10.4 | 10.3 | 8.8 | 6.9 | 4.4 | 4.0 |
| Rain mm/day | 2.6 | 2.0 | 3.4 | 2.3 | 2.5 | 1.8 | 2.6 | 1.9 | 2.6 | 3.7 | 2.9 | 1.9 |
When to go
Rennes is warmest in August at 18.9 °C but brightest in June, averaging 12.4 hours of sun a day — the two do not always coincide, which is worth knowing before booking. Its coldest is January at 5.9 °C.
On these lists
Three months worth booking
The same year of measurements, decided rather than tabulated. Each opens the map below on dates in that month.
Staying there
A hotel room in France emits about 6.7 kg CO₂e per night under UK Government 2026 factors — a country average per occupied room, not this or any particular hotel. 7 nights in one room adds roughly 47 kg — about 5.2× the carbon of one person getting there by rail from Paris. Two sharing the room halve that share each; the journey does not halve.
How busy it gets
Ille-et-Vilaine records 5 overnight stays per resident a year (5,665,322 nights in 2025). Comparatively quiet by European standards.
Eurostat, nights spent at tourist accommodation by NUTS 3 region, against resident population. Shown for context only — it plays no part in which destinations appear or in what order. Eurostat does not cover the United Kingdom after 2016, nor North Africa or the Levant at all, so this figure is absent for roughly a third of the destinations here.
Where to stay in Rennes
Places to stay in Rennes, France, on a live map. Prices and availability come from Stay22 and its booking partners.
Search places to stay in Rennes →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.
Distances are great-circle. Rail assumes international rail at 0.01135 kg CO₂e per passenger-km with a 1.3× track detour allowance; flights use 0.12576 kg per passenger-km including radiative forcing. Journey times are modelled, not timetabled. Full method.