Climate guide for Kasos, Greece

Best Time to Visit
Kasos

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01 · Greece

About Kasos

Kasos lies south of Karpathos and close to Crete, the southernmost island of the Dodecanese, and it stays free of large resorts. Fri is the harbour town, with a sandy beach at Bouka nearby; Emporio and Agia Marina are villages inland, and the chapel on the islet of Armathia is reached by boat. Cliffs along the west coast drop to clear water, and ferries connect with Karpathos, Rhodes and Piraeus. May to early October is the season, and winter weather can cancel sailings.

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Did you know?

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Travel Tips

01Best time & timing
The strongest months are September, July, August: September peaks at 9.8/10, while January drops to 5.4/10.
02Weather & what to pack
24°C and 2 mm of rain shape a typical September here. Pack light clothing, swimwear and strong sun protection.
03Crowds & value
Book early for July, the busiest stretch; June is the value window at 9.1/10.

Things to do in Kasos

Kasos, Greece. Live activities and tours from GetYourGuide, matched to this destination.

When to visit Kasos: the short answer

The best time to visit Kasos is September, followed by July, August. Those months combine the most usable temperatures with the fewest lost days to rain: September averages 24°C with 2 mm of rain and about 30 days with 6+ hours of sunshine. The months to avoid unless you have a specific reason are January, December. If budget matters more than perfect weather, April is the strongest of the low-rate months at 6.6/10.

Across the year Kasos swings from 13°C in February to 25°C in August, a 11-degree spread, while rainfall ranges from 0 mm in July to 71 mm in January. That is the whole planning problem in one sentence: Kasos is not equally good year-round, and the difference between the best and worst month here is 4.4 points on a 10-point scale.

Warmest month: August (25°C). Coolest: February (13°C). Driest: July (0 mm). Wettest: January (71 mm).

Kasos month by month

January in Kasos — workable with trade-offs

Trade-offs · 5.4/10

January averages 14°C (58°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.

Rainfall runs 71 mm, so plan one flexible day in three; you still get about 27 days with 6+ hours of sunshine and 10.1 hours of daylight.

It scores 5.4/10 here, 12th of 12 months, against 9.8/10 in the destination's best month.

Plan for low-season pricing, with crowds are light for this destination.

Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.

Flexible dates? September scores 4.4 points higher here — enough to change the trip.

February in Kasos — workable with trade-offs

Trade-offs · 6.1/10

February averages 13°C (56°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.

Expect 42 mm of rain — occasional showers rather than washed-out days — alongside about 25 days with 6+ hours of sunshine and 10.9 daylight hours.

It scores 6.1/10 here, 10th of 12 months, against 9.8/10 in the destination's best month.

Plan for low-season pricing, with crowds are light for this destination.

Pack layers you can shed by midday plus one warm layer for the evening.

Flexible dates? September scores 3.7 points higher here — enough to change the trip.

March in Kasos: mixed conditions, plan around the weather

Trade-offs · 6.3/10

Temperatures hover around 14°C (57°F) — the kind of month where neither heat nor cold forces the schedule.

With around 30 mm of rain, any showers tend to pass through rather than settle in; about 30 days with 6+ hours of sunshine and 12 hours of daylight fill the rest.

That is 6.3/10 on the same scale — 9th of 12 months, versus 9.8/10 for the best month here.

Budget for low-season pricing, and crowds are light for this destination.

Pack layers you can shed by midday plus one warm layer for the evening.

If your dates are flexible, September is materially better in Kasos — 3.5 points higher on the same scale.

April in Kasos: mixed conditions, plan around the weather

Trade-offs · 6.6/10

April averages 16°C (60°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.

Rain is a non-issue at 10 mm for the month, with about 29 days with 6+ hours of sunshine and 13.1 hours of daylight to work with.

It scores 6.6/10 here, 8th of 12 months, against 9.8/10 in the destination's best month.

Figure on low-season pricing, with crowds are light for this destination.

Pack layers you can shed by midday plus one warm layer for the evening.

Flexible dates? September scores 3.2 points higher here — enough to change the trip.

May in Kasos — reliably good (7th best month)

Good · 7.5/10

Temperatures hover around 18°C (64°F) — the kind of month where neither heat nor cold forces the schedule.

At just 10 mm for the month, rain will not shape your plans; you get about 30 days with 6+ hours of sunshine and 14 hours of daylight.

That is 7.5/10 on the same scale — 7th of 12 months, versus 9.8/10 for the best month here.

Expect mid-season pricing, and crowds are moderate.

Pack layers you can shed by midday plus one warm layer for the evening.

If your dates are flexible, September is materially better in Kasos — 2.3 points higher on the same scale.

June ranks 4th of 12 for Kasos — one of the best windows

Best window · 9.1/10

June averages 22°C (71°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Rain is a non-issue at 6 mm for the month, with about 30 days with 6+ hours of sunshine and 14.5 hours of daylight to work with.

A 9.1/10 puts this among the year's best months in Kasos (4th of 12); only September scores higher, at 9.8/10.

Figure on mid-season pricing, with crowds are moderate.

Pack light clothing, swimwear and real sun protection.

July is one of the strongest months in Kasos (2nd)

Best window · 9.7/10

July averages 24°C (75°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Rain is a non-issue at 0 mm for the month, with about 31 days with 6+ hours of sunshine and 14.3 hours of daylight to work with.

A 9.7/10 puts this among the year's best months in Kasos (2nd of 12); only September scores higher, at 9.8/10.

Plan for peak pricing, with 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.

Pack light clothing, swimwear and real sun protection.

August is one of the strongest months in Kasos (3rd)

Best window · 9.7/10

With 25°C (76°F) on average, August delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.

At just 1 mm for the month, rain will not shape your plans; you get about 31 days with 6+ hours of sunshine and 13.5 hours of daylight.

On our climate-comfort scale this is one of the strongest months of the year for Kasos at 9.7/10 (3rd of 12), just behind September at 9.8/10.

Expect 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.

Pack light clothing, swimwear and real sun protection.

September in Kasos tops the year's climate scores

Best window · 9.8/10

With 24°C (74°F) on average, September delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.

At just 2 mm for the month, rain will not shape your plans; you get about 30 days with 6+ hours of sunshine and 12.4 hours of daylight.

On our climate-comfort scale this is the top-ranked month of the year for Kasos at 9.8/10 — the reference point every other month on this page is measured against.

Budget for peak pricing, and crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.

Pack light clothing, swimwear and real sun protection.

October ranks 5th of 12 for Kasos — one of the best windows

Best window · 8.7/10

October averages 21°C (69°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Expect 18 mm of rain — occasional showers rather than washed-out days — alongside about 31 days with 6+ hours of sunshine and 11.3 daylight hours.

A 8.7/10 puts this among the year's best months in Kasos (5th of 12); only September scores higher, at 9.8/10.

Figure on mid-season pricing, with crowds are moderate.

Pack light clothing, swimwear and real sun protection.

November in Kasos — reliably good (6th best month)

Good · 7.8/10

November averages 19°C (66°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.

Expect 24 mm of rain — occasional showers rather than washed-out days — alongside about 29 days with 6+ hours of sunshine and 10.3 daylight hours.

It scores 7.8/10 here, 6th of 12 months, against 9.8/10 in the destination's best month.

Plan for mid-season pricing, with crowds are moderate.

Pack layers you can shed by midday plus one warm layer for the evening.

Flexible dates? September scores 2 points higher here — enough to change the trip.

December in Kasos: mixed conditions, plan around the weather

Trade-offs · 6.1/10

Temperatures hover around 16°C (61°F) — the kind of month where neither heat nor cold forces the schedule.

Budget for roughly 56 mm of rain this month — a flexible day or two helps — with about 28 days with 6+ hours of sunshine and 9.8 hours of daylight to work around it.

That is 6.1/10 on the same scale — 11th of 12 months, versus 9.8/10 for the best month here.

Budget for mid-season pricing, and crowds are light for this destination.

Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.

If your dates are flexible, September is materially better in Kasos — 3.7 points higher on the same scale.

FAQ

Frequently asked

When is the best time to visit Kasos, Greece?
In Ideal Weather mode, the best months to visit Kasos are September, July, August, June. September is the single peak month with an Ideal Weather score of 9.8/10 based on temperature, rainfall, humidity, daylight and days with 6+ hours of sunshine.
What is the weather like in Kasos year-round?
Kasos has a climate profile suited to beach and coastal travel. Average monthly temperatures range from 13°C in February to 25°C in August, with Ideal Weather scores between 5.4 and 9.8 out of 10.
Which months should I avoid in Kasos?
The lowest Ideal Weather-scoring months in Kasos are January (5.4/10), February (6.1/10), December (6.1/10). These months typically combine less comfortable temperatures, higher rainfall or fewer days with 6+ hours of sunshine.
When is the rainy season in Kasos?
January is the wettest month in Kasos, averaging about 71 mm of rainfall. July is the driest, at roughly 0 mm.
Which is the sunniest month in Kasos?
July sees the most sun in Kasos, with about 31 days with 6+ hours of sunshine on average - ideal for outdoor plans.
Is Kasos a good destination for beach and coastal travel?
Kasos is well suited to beach and coastal travel. Its highest Ideal Weather window (September, July, August, June) aligns with the conditions travelers usually look for in this style of trip.
How is the bestime.to score for Kasos calculated?
Each month receives an Ideal Weather score from 0-10 using ERA5 climate normals for Kasos: temperature comfort, precipitation, humidity, daylight hours, and days with 6+ hours of sunshine - weighted for beach and coastal travel.

Climate data: Open-Meteo ERA5 historical archive, the five most recent complete years (2021–2025). Scores are monthly averages for that window, not forecasts, and short-window precipitation can differ from longer-term normals. “Sunny days” count days with at least 6 hours of measured sunshine — they are not dry days.

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