August · Greece
Best time to visit Kos Island in August Weather, crowds & prices
Weather in Kos Island in August
Average temperature 28°C, 6 mm of rain, about 31 days with 6+ hours of sunshine and 65% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
10.0/10
Ranked #3 of 12 months
- Avg temp
- 28°C
- Rainfall
- 6 mm
- Humidity
- 65%
- Days with 6h+ sun
- 31
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
August in Kos Island scores 10.0/10 for beach and coastal travel - one of the top 12-month picks (#3). Expect around 28°C, 6 mm of rain, and roughly 31 days with 6+ hours of sunshine this month.
Kos mixes sandy beaches and cycling paths with the ruins of Hippocrates' ancient healing centre.
August is one of the strongest months in Kos Island (3rd)
Days in August average 28°C (83°F) — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
At just 6 mm for the month, rain will not shape your plans; you get about 31 days with 6+ hours of sunshine and 13.4 hours of daylight.
On our climate-comfort scale this is one of the strongest months of the year for Kos Island at 10/10 (3rd of 12), just behind June at 10/10.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
Budget for peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Kos Island in August?
- In August, Kos Island averages 28°C, 6 mm of rain, and about 31 days with 6+ hours of sunshine. Its climate-comfort score is 10.0/10.
- Is August a good time to visit Kos Island?
- August earns a 10.0/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Kos Island in August?
- Expect about 6 mm of rain in August. Average humidity is 65% and there are about 31 days with 6+ hours of sunshine.
Curated in Kos Island
Tickets & experiences
Things to do in Kos Island
Kos Island, Greece. Live activities and tours from GetYourGuide, matched to this destination.