Azores · Month comparison
September vs May
May ranks #1 overall vs September at #2. The hydrangea season begins — the Azores in full flower, whale diversity at its peak, and conditions at their most photogenic.
September
#2 of 12 months
Best match
The sweet spot — summer crowds thin, sea temperature still warm, and the Azores returns to a manageable scale.
- ↑September is the optimal month for the Azores: the August peak crowds have gone, the sea is at its warmest (24°C), accommodation prices drop 25–30%, and the weather remains mostly excellent with only the beginning of autumn fronts arriving in the final week; the combination of summer conditions and shoulder-season crowds makes September the most balanced month
- ↑Whale watching in September transitions to the autumn migration period: northern bottlenose whales and false killer whales appear on the deeper Atlantic passages, and the permanent sperm whale population is joined by autumn migratory species that make the species diversity the second most interesting period of the year (after April–May)
May
#1 of 12 months
Best match
The hydrangea season begins — the Azores in full flower, whale diversity at its peak, and conditions at their most photogenic.
- ↑Hydrangea peak season begins in late May on São Miguel and Faial: the volcanic roads disappear between walls of blue, pink, and white Hortensia so dense that the landscape is defined by them; the Sete Cidades crater lake rim road and the Faial cliffs above Capelo are the most spectacular; the combination of vivid blue flowers, black lava stone, and the turquoise lake surface below is the defining Azorean landscape image
- ↑May whale watching is outstanding — blue whales and fin whales are reliably present before they depart for northern feeding grounds, sperm whales remain year-round, and bottlenose and common dolphins are visible on nearly every trip; the Azores Whale Watch operators in Lajes do Pico and Madalena use traditional land-based whale spotting techniques inherited from the whaling era
| Factor | September | May |
|---|---|---|
| Weather score | 8 | 7 |
| Value score | 6 | 7 |
| Crowd score | 6 | 7 |
| Events score | 6 | 7 |
| Atmosphere | 8 | 9 |
| Avg high temp | 25°C | 21°C |
| Monthly rain | 45mm | 50mm |
| Daily sunshine | 8hrs | 7.5hrs |
September trade-offs
- ↓Autumn fronts begin in late September — the first Atlantic depressions arrive in the final 10 days of September; a September visit should plan activities and hiking for the first 3 weeks and use the final days for indoor cultural activities
- ↓Some seasonal operators (particularly on smaller islands like Flores, Corvo, and Graciosa) begin winding down in September; activities that require minimum group sizes become harder to book as visitor numbers fall
- ↓Pico summit hiking window closes in mid-September — by the last week of September the summit is frequently in cloud again; September 1–15 is the final reliable window for a clear summit ascent
May trade-offs
- ↓May is the beginning of the European tourist season — Ponta Delgada on São Miguel sees a meaningful increase in visitors from Lisbon and Northern Europe; the best guided whale watch operators, the most popular trailheads (Sete Cidades, Lagoa do Fogo), and the standout accommodation start booking out at the short end
- ↓Rainfall is still possible (50mm) — the Azores Atlantic location means even the best months can deliver a wet day or two; the Furnas caldeira valley and the Lagoa do Fogo crater lake are sometimes in cloud even in May
- ↓Senhor Santo Cristo festival crowds in Ponta Delgada (if falling in May) can temporarily pack the city's infrastructure beyond capacity — accommodation within 5km of the city centre is essentially unavailable at any price during the festival weekend
Scores compare months within Azores. Climate data: Open Meteo ERA5 30-year normals (1991–2020). Methodology →