Destination guide
Thassos weather by month
July, August and September are the strongest choices for warm-weather holidays in Thassos. August combines daytime averages around 28°C with a sea temperature of 26°C, while September eases back to 24°C by day without losing comfortable swimming conditions. The catch with high summer is the warmth at midday and overnight. Choose late spring for milder days if swimming is secondary, or early autumn if you want warm water without the highest daytime temperatures.
- Hottest month
- 28.3°CAugust
- Coolest month
- 9.0°CJanuary
- Warmest sea
- 25.9°CAugust
- Flight from London
- 3 h 30 minShort-haul (up to 4.5 h) · estimated
Thassos, month by month
Month-by-month detail pages exist for our most searched destinations; for Thassos the 12-month table below carries the full picture.
A little perspective
Thassos through the year
Every month at a glance; "best" marks our three top months on warmth, dryness and sunshine.
| Month | Day | Night | Sea | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| January | 9.0°C | 4.7°C | 12.6°C | 4.1 | 75 | 9 | 0% |
| February | 9.7°C | 5.0°C | 11.7°C | 4.5 | 71 | 8 | 0% |
| March | 11.8°C | 7.1°C | 11.9°C | 5.2 | 71 | 10 | 0% |
| April | 15.3°C | 10.3°C | 13.8°C | 6.4 | 53 | 9 | 0% |
| May | 20.1°C | 15.2°C | 18.3°C | 7.7 | 45 | 9 | 4% |
| June | 24.8°C | 19.8°C | 22.6°C | 10.1 | 35 | 7 | 44% |
| Julybest | 27.6°C | 22.5°C | 25.2°C | 11.8 | 24 | 5 | 91% |
| Augustbest | 28.3°C | 23.0°C | 25.9°C | 11.3 | 15 | 4 | 95% |
| Septemberbest | 24.0°C | 19.2°C | 23.7°C | 8.4 | 34 | 5 | 36% |
| October | 19.1°C | 14.6°C | 20.4°C | 5.9 | 62 | 7 | 1% |
| November | 14.5°C | 10.3°C | 17.0°C | 4.3 | 106 | 9 | 0% |
| December | 10.4°C | 6.3°C | 14.3°C | 3.8 | 108 | 10 | 0% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
- Sea
Best months here
On warmth, low rainfall and sunshine, start with these.
When to go to Thassos
For beach weather, look at months where the daytime average clears 25°C and rainy days stay low: July, August. December is the wettest month (108 mm, about 10 rainy days) and August the driest (15 mm). The sea is warmest in August at 25.9°C and coolest in February at 11.7°C.
Getting there
A direct flight from London Gatwick to Kavala Alexander the Great International Airport (KVA, 17 km from Thásos) takes roughly 3 h 30 min - short-haul (up to 4.5 h) by UK standards. Time-zone: Europe/Athens.
Records and extremes, 1991-2020
The hottest day recorded in Thassos between 1991 and 2020 reached 36.4°C on 6 August 2017; the coldest fell to -6.2°C on 19 December 2001. In August one day in ten tops 31.4°C and about 20% of days pass 30°C; in January one night in ten drops to 0.5°C or below. The wettest single month of the period was November 2019 with 345 mm, against a November average of 106 mm.
Sunrise, sunset and daylight in Thassos
Local time on the 15th of each month; daylight-saving rules as of 2020.
| Month (15th) | Sunrise | Sunset | Daylight | Sunshine/day |
|---|---|---|---|---|
| January | 07:44 | 17:17 | 9.6 h | 4.1 h |
| February | 07:16 | 17:54 | 10.6 h | 4.5 h |
| March | 06:33 | 18:27 | 11.9 h | 5.2 h |
| April | 06:42 | 20:00 | 13.3 h | 6.4 h |
| May | 06:04 | 20:31 | 14.5 h | 7.7 h |
| June | 05:49 | 20:54 | 15.1 h | 10.1 h |
| July | 06:03 | 20:52 | 14.8 h | 11.8 h |
| August | 06:31 | 20:20 | 13.8 h | 11.3 h |
| September | 07:02 | 19:31 | 12.5 h | 8.4 h |
| October | 07:32 | 18:41 | 11.1 h | 5.9 h |
| November | 07:08 | 17:03 | 9.9 h | 4.3 h |
| December | 07:38 | 16:54 | 9.3 h | 3.8 h |
Spring: mild days arrive before warm seas
March is still cool rather than reliably warm, with daytime averages of 12°C and nights that call for a proper outer layer. April reaches 15°C, making time outdoors more comfortable, but rain remains part of the picture. May is the better spring compromise for travellers who prefer gentle warmth: days average 20°C, evenings are milder and sunshine increases to 8 hours. The catch is the sea, which averages only 18°C even in May. Pack layers and a waterproof throughout spring, and treat swimming as an optional extra rather than the main reason to travel.
Summer into September: the best stretch for swimming
June brings a clear step towards summer, with 25°C days and a 23°C sea, though rain is still possible. July and August suit travellers who want the warmest conditions and plenty of sunshine. Both average 28°C by day, so put more active plans in the morning and leave room for shade at midday. August has the warmest sea at 26°C and the fewest rain days, but nights averaging 23°C offer limited relief from the warmth. September is a useful alternative: daytime and sea temperatures both average 24°C, giving swimmers warm water with less heat on land. Keep a light layer handy for evenings.
Autumn and winter: cooler weather needs flexible plans
October can suit travellers who value mild outdoor weather more than dependable beach conditions. Days average 19°C and the sea holds at 20°C, although shorter sunshine hours and more rain make flexibility useful. November feels noticeably cooler, with 14°C days and a sea that is less inviting for relaxed swimming. December and January are better approached as cool-weather stays: pack a waterproof, warm layers and clothes for chilly evenings rather than relying on sunshine. January is the coolest month, averaging 9°C by day. February edges up to 10°C, but its 12°C sea keeps swimming firmly in cold-water territory. Winter suits travellers comfortable with weather-led plans, not those seeking a warm seaside holiday.
A little more detail
Thassos weather FAQs
Plain answers, grounded in the averages.
What is the best time to visit Thassos?
Judged on warmth, low rainfall and sunshine, the best months in Thassos are August, July and September. August is the hottest month (average high 28.3°C) and January the coolest (9.0°C).
How many months a year is Thassos over 25°C?
2 months in Thassos average a daytime high of 25°C or more, and 5 average 20°C or more.
When is the rainy season in Thassos?
December is the wettest month in Thassos (108 mm on average) and August the driest (15 mm). Annual rainfall averages 699 mm.
What is the hottest temperature recorded in Thassos?
The hottest day recorded in Thassos between 1991 and 2020 reached 36.4°C on 6 August 2017; the coldest fell to -6.2°C on 19 December 2001. Records come from daily data for 1991-2020, not from a single station's all-time history.
When is the sea warmest in Thassos?
August has the warmest sea, averaging 26°C, with July close behind at 25°C. September remains a good swimming choice at 24°C. June also offers warmer water than spring, so it is a better fit than May if swimming matters most.
Is May or October better for a holiday?
May is slightly warmer by day, with more sunshine, making it the stronger choice for spending time outdoors. October has the warmer sea at 20°C compared with May's 18°C. Neither offers the same combination of warm air and water as summer.
Which summer month has the least rain?
August averages 4 rain days, compared with 5 in July and 7 in June. That makes August the best summer bet for fewer wet interruptions, but not a guarantee of dry weather throughout your stay. Keep outdoor plans flexible.
See also: Greece weather by month · where else is hot in August
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid) and NOAA Coral Reef Watch 5 km sea temperatures, 1991-2020
Averages computed from daily values at Thásos. Sea temperature from the nearest 5 km sea cell, 1.4 km from that point. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C