Algarve or Costa del Sol in September?
On climate data, Costa del Sol comes out ahead overall in September. See the per-criterion details below.
AlgarvePhoto: Eurico Craveiro · CC BY-SA 4.0
Costa del SolPhoto: Nan Palmero from San Antonio, TX, USA · CC BY 2.0Key figures in September
| Criterion | Algarve | Costa del Sol |
|---|---|---|
| Day | 25 °C ★ | 24 °C |
| Night | 19 °C | 20 °C ★ |
| Sea | 21 °C | 22 °C ★ |
| Rainy days | 3 rainy days | 3 rainy days |
| Sun | 7 h/day ★ | 7 h/day |
Winner by travel type
Algarve or Costa del Sol in September: the short answer
In September, Costa del Sol comes out ahead on the overall climate score (Algarve 90/100 vs Costa del Sol 91/100). That is a snapshot of one month, though — which one truly fits depends on what you want from the trip, so the breakdown below goes criterion by criterion.
Across the whole year Algarve averages a climate score of 72/100, Costa del Sol 72/100. Both profiles below are historical monthly averages, not a forecast.
Weather in September, side by side
By day, Algarve sits near 25 °C and Costa del Sol near 24 °C — warmer in Algarve. At night it is roughly 19 °C versus 20 °C.
On rain, Algarve sees about 3 rainy days in September and Costa del Sol about 3. Algarve gets more sunshine (7 vs 7 hours a day).
Sea temperature and swimming
In September the water is about 21 °C at Algarve and 22 °C at Costa del Sol — warmer for swimming at Costa del Sol. Over the year, Algarve is comfortable for swimming (from ~21 °C) in July, August and September, Costa del Sol in July, August and September. Peak sea warmth is August for Algarve and August for Costa del Sol.
Rain and sun across the year
Over a full year Algarve records roughly 58 rainy days and Costa del Sol about 47 — the drier of the two overall is Costa del Sol. At their sunniest, Algarve reaches about 10 hours of sun a day (July) and Costa del Sol about 10 (June). If dependable dry, sunny weather is your top priority, weigh these annual totals alongside the single month above.
Best time to visit each
Climatically, Algarve is at its best in June, July, August and September, while Costa del Sol peaks in June, July, August and September. If your dates are fixed, pick the destination whose strong season overlaps them; if you are flexible, plan around these windows.
Which suits which kind of trip
Based on the September scores for each travel style:
Beach & swimming: both are close.
City breaks: Costa del Sol scores higher in September.
Active & hiking: Costa del Sol scores higher in September.
Family: Algarve scores higher in September.
Verdict: which should you pick?
There is no single winner — it depends on your month and your priority. For September specifically, use the head-to-head above; over the year, Algarve carries the slightly higher overall climate score. Choose Algarve if its strong months and profile match your plan, Costa del Sol if its do. The month-by-month pages for each destination give you the full picture before you book.