Algarve or Costa del Sol in September?
In September, Algarve and Costa del Sol are overall neck and neck — it comes down to your priorities.
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 |
|---|---|---|
| Average daily high | 25 °C | 24 °C |
| Average daily low | 19 °C | 20 °C |
| Sea | 21 °C | 22 °C ★ |
| Rainy days | 3 rainy days (est.) ★ | 4 rainy days (est.) |
| Sun | 7 h/day | 7 h/day |
| Humidity | 71 % | 74 % |
Winner by travel type
Algarve or Costa del Sol in September: the short answer
In September, Algarve and Costa del Sol are essentially level on the overall climate score (both around 90/100). The decision comes down to the individual criteria below.
This comparison focuses on September as a representative month for the pair; for any other month, use each destination's month-by-month pages. Across the whole year Algarve averages a climate score of 72/100, Costa del Sol 71/100. Both profiles below are historical monthly averages, not a forecast.
Weather in September, side by side
The average daily high is about 25 °C in Algarve and 24 °C in Costa del Sol — warmer in Algarve. Average daily lows are around 19 °C versus 20 °C.
On rain, Algarve sees about 3 rainy days in September and Costa del Sol about 4 — drier in Algarve. Sunshine is comparable (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 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 66 rainy days and Costa del Sol about 63 — 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 (July). 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: Algarve scores higher in September (Algarve 90 vs Costa del Sol 89).
City breaks: Costa del Sol scores higher in September (Algarve 95 vs Costa del Sol 97).
Active & hiking: Costa del Sol scores higher in September (Algarve 83 vs Costa del Sol 85).
Family: Algarve scores higher in September (Algarve 92 vs Costa del Sol 91).
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.