Best Time to Visit Greece

Photo by Constantinos Kollias on Unsplash

The best months to visit Greece are May, September, and October. September is the standout: highs of 29.4°C (84.9°F), lows of 20.5°C (68.9°F), and just 4.6mm (0.18in) of rain across 2 rainy days — summer heat without July's 35.8°C (96.4°F). May gives you 25.7°C (78.3°F) days and 16.3°C (61.3°F) nights with 42.7mm (1.68in) spread over 7 days, and October still hits 22.1°C (71.8°F) before the weather turns hard in November.

All figures below are measured 2025 data for Athens. Crete and the southern Aegean run warmer; Thessaloniki and the mountainous north run cooler and wetter. Athens is the reference point most itineraries pass through.

The best months: May, September, October

September is the month to book if you can only pick one. The high of 29.4°C (84.9°F) is 6.4°C cooler than July, but the low of 20.5°C (68.9°F) means evenings stay warm enough to eat outside in a t-shirt. Rainfall is effectively nothing: 4.6mm (0.18in) over 2 days. Statistically, you get 28 dry days. The sea has spent three months absorbing 32–35°C air and cools far more slowly than air does, so swimming is better in September than in June.

May is the cooler mirror image. Highs of 25.7°C (78.3°F) are comfortable for a full day of walking the Acropolis, Delphi, or Ancient Corinth — all of which are exposed, unshaded stone. The 16.3°C (61.3°F) low means a light jacket after sunset. The 42.7mm (1.68in) over 7 days works out to about 6mm per wet day: real rain, but the kind that passes. Roughly one day in four sees some rain, so a 10-day May trip should expect two or three days with a shower in them, not two or three washed-out days.

October is the last usable month. Highs of 22.1°C (71.8°F) and lows of 15.0°C (59.0°F) put it in shirt-and-light-layer territory. 35.4mm (1.39in) over 6 days is manageable. What makes October worth it is what happens immediately after: November brings 172.7mm (6.80in). October is the edge of the cliff.

The months to avoid: July, August, and November

July peaks at 35.8°C (96.4°F) with a low of 25.4°C (77.7°F). That low is the problem more than the high. A 25.4°C overnight minimum means the city does not cool down — accommodation without functioning air conditioning is genuinely miserable, and the 10.4°C day-night swing is too small for the evening to feel like relief. Archaeological sites have no shade. Rainfall is 3.2mm (0.13in) over 1 day, so you will not be rained on; you will just be cooked. If you go in July, you do sites from 08:00 to 11:00, disappear indoors or into the sea until 18:00, and come back out at dusk.

August is marginally better at 32.5°C (90.5°F) high and 23.4°C (74.1°F) low, with the same 3.2mm (0.13in) over 1 day. The weather argument against August is weaker than the crowd-and-price argument: it is the peak of European holiday season, and you are paying maximum rates for weather that is 3.3°C worse than September's.

November is the one to genuinely avoid. 172.7mm (6.80in) fell across 12 days — that is 30% of the entire year's 565.9mm in a single month, and it averages 14.4mm per wet day. Twelve wet days out of thirty with that intensity means proper sustained rain, not passing showers. The 19.9°C (67.8°F) high is deceptively mild, which is exactly the trap: the temperature looks fine on a forecast app and the ferry gets cancelled anyway.

December is drier in day count but heavier per event: 96.4mm (3.80in) over just 6 days, or 16.1mm per rainy day — the most intense rain of any month in the table. Five out of six December days are dry; the sixth is a soaking.

Shoulder season: where the value actually is

The real shoulder windows are late April into May and October, with a fringe case in March.

April is the weakest shoulder month, and the data says so clearly. It has 13 rainy days — the most of any month in the year, more than November's 12 — delivering 83.6mm (3.29in). The high is only 19.2°C (66.6°F), barely above March's 18.1°C (64.6°F). April is cheaper than May for a reason: you are trading 6.5°C of daytime warmth and almost double the wet days for the saving. Late April is a gamble; early May is not.

March is the sleeper. It has the least rain of any non-summer month — 25.0mm (0.98in) over just 4 days — and highs of 18.1°C (64.6°F). That is 26 dry days at low-season prices. It is too cold to swim at a 10.0°C (50.0°F) overnight low, and many island businesses have not opened yet, but for Athens, Delphi, Meteora, and Peloponnese archaeology, March is quietly excellent and almost nobody books it.

October is the best-value month overall: 22.1°C (71.8°F), 24 dry days, sea still warm from summer, and post-season pricing. The catch is that island ferry schedules and hotel openings thin out through the month.

What each season actually means on the ground

Summer (June–September) — Four months produced a combined 15.1mm (0.59in) of rain over 5 days. Effectively zero. Pack for heat and sun exposure only: no rain jacket, a refillable bottle, a hat, and shoes you can walk hot stone in. June's 32.9°C (91.2°F) and August's 32.5°C (90.5°F) are nearly identical — June is not the "mild" summer month people assume. Your day is structured around avoiding 12:00–17:00 outdoors.

Autumn (October–November) — October you dress for 22.1°C (71.8°F) days and 15.0°C (59.0°F) evenings: one warm layer, no more. November you dress for water. 172.7mm over 12 days is umbrella-and-waterproof-shoes weather, and it is the month when island ferries get cancelled.

Winter (December–February) — Athens winter is mild, not cold. February is the coldest month at 11.5°C (52.7°F) high and 5.3°C (41.5°F) low — notably colder than January's 14.8°C (58.6°F) and 8.0°C (46.4°F). February also has the most winter rain days at 9, with 51.3mm (2.02in). You are wearing a proper coat, doing museums, and eating long lunches indoors. It never freezes, but the 6.2°C day-night swing in February means it stays grey and cool all day rather than warming up.

Spring (March–May) — March is dry and cool, April is wet and cool, May is warm and mostly dry. Layers you can shed by midday. In May you can start swimming; in March and April you cannot.

Month-by-month

• January — 14.8°C / 8.0°C (58.6°F / 46.4°F), 43.7mm (1.72in) over 5 days. Mildest of the winter months, and only 5 wet days.
• February — 11.5°C / 5.3°C (52.7°F / 41.5°F), 51.3mm (2.02in) over 9 days. The coldest and greyest month of the year.
• March — 18.1°C / 10.0°C (64.6°F / 50.0°F), 25.0mm (0.98in) over 4 days. Driest month outside summer. Underrated for sightseeing.
• April — 19.2°C / 11.0°C (66.6°F / 51.8°F), 83.6mm (3.29in) over 13 days. The most rainy days of any month. Skip if you can.
• May — 25.7°C / 16.3°C (78.3°F / 61.3°F), 42.7mm (1.68in) over 7 days. Warm days, cool nights, swimming starts.
• June — 32.9°C / 22.7°C (91.2°F / 72.9°F), 4.1mm (0.16in) over 1 day. Already full summer heat, not a mild lead-in.
• July — 35.8°C / 25.4°C (96.4°F / 77.7°F), 3.2mm (0.13in) over 1 day. Hottest month. Nights don't cool below 25.4°C.
• August — 32.5°C / 23.4°C (90.5°F / 74.1°F), 3.2mm (0.13in) over 1 day. Peak crowds, peak prices, 3.3°C hotter than September.
• September — 29.4°C / 20.5°C (84.9°F / 68.9°F), 4.6mm (0.18in) over 2 days. The best month of the year.
• October — 22.1°C / 15.0°C (71.8°F / 59.0°F), 35.4mm (1.39in) over 6 days. Best value. Book before November.
• November — 19.9°C / 13.9°C (67.8°F / 57.0°F), 172.7mm (6.80in) over 12 days. Nearly a third of the year's rain.
• December — 15.7°C / 8.7°C (60.3°F / 47.7°F), 96.4mm (3.80in) over 6 days. Mostly dry, but wet days are heavy.

FAQ

What is the cheapest month to visit Greece with decent weather?

October. You get 22.1°C (71.8°F) highs, 24 dry days out of 31, and post-peak pricing. If you want cheaper still and don't need to swim, March is the value pick — 18.1°C (64.6°F) and only 25.0mm (0.98in) of rain over 4 days, the driest month outside summer, at deep low-season rates. Avoid April as a budget choice: it is barely warmer than March at 19.2°C (66.6°F) but has 13 rainy days and 83.6mm (3.29in).

Is August too hot for Greece?

August at 32.5°C (90.5°F) high and 23.4°C (74.1°F) low is hot but survivable — July is the harder month at 35.8°C (96.4°F) with a 25.4°C (77.7°F) overnight low that never lets the city cool. The stronger argument against August is comparative: September delivers 29.4°C (84.9°F) with the same near-zero rain, fewer crowds, and lower prices. You lose nothing by shifting three weeks later. If you are locked into August by school holidays, book accommodation with confirmed air conditioning and plan indoor time between noon and 17:00.

Can you still swim in Greece in October?

Yes, through most of the month. Air highs of 22.1°C (71.8°F) sound marginal, but sea water carries the heat of June through September — four months of 29–36°C air — and cools much more slowly than air does. Early October swimming is normal; by late October the 15.0°C (59.0°F) nights start pulling it down. May is the reverse case: 25.7°C (78.3°F) air feels swimmable, but the water is still coming out of a winter that bottomed at 5.3°C (41.5°F) lows in February.

When does it actually rain in Greece, and how bad is it?

Rain concentrates almost entirely in November and December. November alone brought 172.7mm (6.80in) over 12 days — 14.4mm per wet day, which is sustained rain rather than a passing shower — and December brought 96.4mm (3.80in) over just 6 days, the heaviest per-event rain of the year. April has the most rainy days at 13, but they are lighter at about 6mm each. From June through September the total is 15.1mm (0.59in) across four months. If you travel between June and October, rain gear is dead weight in your bag.

Packing is half of it — the other half is knowing what to eat in Greece once you land.