Dublin · September · warmth

Warmest places to go from Dublin in September

The warmest place you can reach from Dublin in September within 15 hours is Sharm el-Sheikh at 33.7 °C, costing 1,017 kg CO₂e return. The lowest-carbon option is Colwyn Bay at 42.2 kg — 24× less carbon for 18.6 °C less.

Every destination here is on the efficiency frontier: nowhere else in Europe is both warmer in September 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 Dublin. Pick one to compare.

By rail or ferry By air

Carbon against warmth, September, departing Dublin. Journeys of up to 15 hours each way.

September from Dublin — 19 destinations on the frontier, 0 without flying.
Destination	How	CO₂e return	Temp	Sun/day	Rain/day	Journey
Colwyn Bay, United Kingdom	Air	42.2 kg	15.1 °C	6.8 h	4.6 mm	3h 42m
Plymouth, United Kingdom	Air	90.5 kg	16.0 °C	8.5 h	4.0 mm	4h
Cherbourg, France	Air	131 kg	16.9 °C	8.4 h	2.7 mm	4h 12m
St-Malo, France	Air	151 kg	17.6 °C	8.9 h	3.0 mm	4h 18m
La Rochelle, France	Air	221 kg	18.7 °C	10.0 h	3.5 mm	4h 42m
Nîmes, France	Air	330 kg	20.3 °C	10.4 h	2.3 mm	5h 12m
Zaragoza, Spain	Air	342 kg	20.8 °C	10.4 h	2.2 mm	5h 18m
Cannes, France	Air	367 kg	21.7 °C	10.3 h	3.3 mm	5h 24m
Valencia, Spain	Air	404 kg	22.9 °C	10.6 h	3.5 mm	5h 36m
Alzira, Spain	Air	412 kg	23.3 °C	10.1 h	2.4 mm	5h 42m
Almería, Spain	Air	467 kg	24.9 °C	11.3 h	0.9 mm	6h
Bizerte, Tunisia	Air	547 kg	25.4 °C	10.8 h	0.4 mm	6h 24m
Kairouan, Tunisia	Air	589 kg	27.0 °C	10.7 h	0.7 mm	6h 36m
Metlaoui, Tunisia	Air	606 kg	27.7 °C	10.5 h	0.3 mm	6h 42m
Tozeur, Tunisia	Air	613 kg	29.4 °C	10.3 h	0.3 mm	6h 48m
Al Fayyum, Egypt	Air	940 kg	30.3 °C	11.7 h	0.0 mm	8h 54m
Assiut, Egypt	Air	989 kg	31.6 °C	11.7 h	0.0 mm	9h 6m
Sohag, Egypt	Air	1,009 kg	32.3 °C	11.7 h	0.0 mm	9h 12m
Sharm el-Sheikh, Egypt	Air	1,017 kg	33.7 °C	11.5 h	0.0 mm	9h 18m

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 Tozeur (613 kg, 29.4 °C) to Al Fayyum (940 kg, 30.3 °C) buys 0.9 °C more warmth for an extra 326 kg — 362 kg of CO₂e per degree. That single step is the most expensive warmth on the whole curve.

The pick of them

Colwyn BayUnited Kingdom42.2 kg CO₂e return15.1 °C · 6.8 h sun · 3h 42m by airwarm but wet Sharm el-SheikhEgypt1,017 kg CO₂e return33.7 °C · 11.5 h sun · 9h 18m by airwarm, bright and dry

If you'd rather have sunshine than heat

September answers differently depending on what you're after. The sunniest destinations from Dublin in September are a different list — the brightest places are not always the hottest, and in winter the difference is large.

Where to stay in Sharm el-Sheikh

Places to stay in Sharm el-Sheikh, Egypt, 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 Dublin

September from elsewhere

Questions

Where is the warmest place to go from Dublin in September?

Sharm el-Sheikh, Egypt, at 33.7 °C. Reaching it emits 1,017 kg CO₂e return, travelling 9h 18m each way by air.

Can I get somewhere warm from Dublin in September without flying?

Not within 15 hours. Every destination on this frontier requires flying in September.

How much carbon does a return trip from Dublin to Sharm el-Sheikh produce?

1,017 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.