Kos · September
Best travel monthTravel seasonGreece · Europe
Climate Overview
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ø day, range from coolest to warmest dayØ dayrange | 15° (59°)7– (45–)18 (64) | 15° (59°)8– (46–)18 (64) | 17° (63°)12– (54–)21 (70) | 20° (68°)15– (59–)26 (79) | 25° (77°)19– (66–)30 (86) | 29° (84°)24– (75–)34 (93) | 32° (90°)28– (82–)36 (97) | 32° (90°)28– (82–)36 (97) | 29° (84°)24– (75–)34 (93) | 24° (75°)18– (64–)28 (82) | 20° (68°)14– (57–)25 (77) | 16° (61°)9– (48–)21 (70) |
Ø night, range from coldest to warmest nightØ nightrange | 9° (48°)1– (34–)15 (59) | 10° (50°)2– (36–)14 (57) | 11° (52°)2– (36–)15 (59) | 14° (57°)8– (46–)17 (63) | 17° (63°)12– (54–)20 (68) | 21° (70°)17– (63–)25 (77) | 23° (73°)20– (68–)26 (79) | 24° (75°)20– (68–)26 (79) | 21° (70°)16– (61–)24 (75) | 18° (64°)12– (54–)21 (70) | 14° (57°)6– (43–)19 (66) | 11° (52°)3– (37–)16 (61) |
☀️Sunshine | 6h UV 5 | 8h UV 6 | 9h UV 7 | 11h UV 9 | 12h UV 9 | 13h UV 10 | 13h UV 10 | 12h UV 9 | 11h UV 8 | 9h UV 6 | 7h UV 5 | 6h UV 4 |
🌊Water Temp | 18° (64°) | 17° (63°) | 17° (63°) | 18° (64°) | 20° (68°) | 23° (73°) | 24° (75°) | 26° (79°) | 25° (77°) | 24° (75°) | 22° (72°) | 20° (68°) |
🌧Rain Days | 9d89mm (3.5") | 5d68mm (2.7") | 5d61mm (2.4") | 1d7mm (0.3") | 2d23mm (0.9") | 0d2mm (0.1") | 0d0mm (0") | 0d0mm (<0.1") | 1d12mm (0.5") | 2d22mm (0.9") | 4d45mm (1.8") | 8d85mm (3.3") |
Best travel time current monthØ = average · small figures = range: coolest–warmest day / coldest–warmest nightClimate data 2005–2025 · Source: ERA5 + station data
Travel season — mid-range prices, good availability.
September is among the best months in Kos: only 1 rain day, 29°C (84°F) highs, and good sunshine make for ideal holiday conditions.
Daytime highs average 29°C (84°F), cooling to 21°C (70°F) at night (daily average: 25°C (77°F)). Peaks reach around 34°C (93°F), the coldest nights around 16°C (61°F). With 11 sunshine hours per day, September is one of the sunniest months — 12 mm (0.5 in) of rain over 1 day. Sea temperature is 25°C (77°F) — pleasantly warm for long swim sessions.
Pack light summer clothing, sunscreen, and swimwear — beach and water conditions in September are ideal.
High season with the Meltemi. The north wind makes 31°C (88°F) bearable and turns Kefalos in the west into a kite spot, while the sheltered southern bays stay calm. Practically zero rain days from June to September.
Packing list for Kos in September
- Light summer clothes
- Swimwear and beach towel
- SPF 50 sunscreen
- Sunglasses
- Sun hat
- Travel first-aid kit
Frequently Asked Questions
- Is September a good time to visit Kos?
- Yes — September is one of the best months to visit Kos (Climate Score: 89/100). Pleasant temperatures (29°C (84°F)), good sunshine (11 h/day), and few rain days (1) make it one of the most recommended months.
- How warm is it in Kos in September?
- In September, Kos sees daily highs of 29°C (84°F). Nights cool to 21°C (70°F), with a daily average of 25°C (77°F). Peaks reach around 34°C (93°F), the coldest nights around 16°C (61°F).
- How much rain falls in Kos in September?
- In September, Kos receives an average of 12 mm (0.5 in) of rain over 1 rain day. That is comparatively dry.
- How many sunshine hours does Kos get in September?
- Kos averages 11 sunshine hours per day in September — above the annual average.
- How warm is the water in Kos in September?
- Water temperature in Kos in September averages 25°C (77°F) — pleasantly warm for swim sessions.
