Corsica · Month comparison

May vs September

May ranks #1 overall vs September at #2. First real sweet spot — 21°C and dry, GR20 lower stages open, Bonifacio beaches without crowds.

Corsica May — Bonifacio cliffs and citadel from sea

May

#1 of 12 months

Best match

First real sweet spot — 21°C and dry, GR20 lower stages open, Bonifacio beaches without crowds.

  • ↑GR20 lower stages open from mid-May — full traverse from early June
  • ↑Cap Corse driving loop without summer traffic
Corsica September — GR20 hikers on granite ridge

September

#2 of 12 months

Best match

The other Goldilocks month — French schools back, sea still 23°C, GR20 at perfect temperature.

  • ↑French schools back week 1 — Palombaggia beaches civilised again
  • ↑GR20 at peak hiking conditions — warm days, cool nights
FactorMaySeptember
Weather score
9
10
Value score
7
6
Crowd score
7
6
Events score
8
8
Atmosphere
10
10
Avg high temp21°C26°C
Monthly rain45mm50mm
Daily sunshine9hrs9hrs

May trade-offs

  • ↓Sea still 17°C — only Northern Europeans swim
  • ↓Upper GR20 stages still snow-bound until early June

September trade-offs

  • ↓First proper autumn rain fronts can bring 50mm in a day late month
  • ↓Cap Corse winds (libeccio) can shut north-coast beaches days at a time
See all 12 months for Corsica →May in detail →September in detail →
Scores compare months within Corsica. Climate data: Open Meteo ERA5 30-year normals (1991–2020). Methodology →