Rhodes or Kos in September?
On climate data, Kos comes out ahead overall in September. See the per-criterion details below.
RhodesPhoto: Ввласенко · CC BY-SA 3.0
KosPhoto: Stimoroll · CC BY-SA 4.0Key figures in September
| Criterion | Rhodes | Kos |
|---|---|---|
| Average daily high | 29 °C | 29 °C |
| Average daily low | 24 °C | 22 °C |
| Sea | 26 °C ★ | 25 °C |
| Rainy days | 2 rainy days (est.) | 2 rainy days (est.) |
| Sun | 7 h/day | 7 h/day |
| Humidity | 62 % | 63 % |
Winner by travel type
Trade-offs
- The sea at Rhodes is about 2 °C warmer.
Rhodes or Kos in September: the short answer
In September, Kos comes out ahead on the overall climate score (Rhodes 89/100 vs Kos 90/100). 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.
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 Rhodes averages a climate score of 72/100, Kos 71/100. Both profiles below are historical monthly averages, not a forecast.
Weather in September, side by side
The average daily high is about 29 °C in Rhodes and 29 °C in Kos — about the same. Average daily lows are around 24 °C versus 22 °C.
On rain, Rhodes sees about 2 rainy days in September and Kos about 2. Sunshine is comparable (7 vs 7 hours a day).
Sea temperature and swimming
In September the water is about 26 °C at Rhodes and 25 °C at Kos — warmer for swimming at Rhodes. Over the year, Rhodes is comfortable for swimming (from ~21 °C) in June, July, August, September, October and November, Kos in June, July, August, September and October. Peak sea warmth is August for Rhodes and August for Kos.
Rain and sun across the year
Over a full year Rhodes records roughly 75 rainy days and Kos about 72 — the drier of the two overall is Kos. At their sunniest, Rhodes reaches about 10 hours of sun a day (June) and Kos 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, Rhodes is at its best in May, June, September and October, while Kos peaks in May, June, September and October. 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: Kos scores higher in September (Rhodes 97 vs Kos 98).
City breaks: Kos scores higher in September (Rhodes 83 vs Kos 84).
Active & hiking: Kos scores higher in September (Rhodes 73 vs Kos 74).
Family: Kos scores higher in September (Rhodes 94 vs Kos 96).
Verdict: which should you pick?
In September, Kos leads across every scored category here — the overall score and each travel type — so on the climate data it is the clearer pick this month. Over the year, Rhodes carries the higher overall climate score. Your own priority (sun, sea, low rain or sightseeing comfort) still matters, and the month-by-month pages for each destination give you the full picture before you book.