Lassi weather by month

When to go to Lassi

For beach weather, look at months where the daytime average clears 25°C and rainy days stay low: July, August, September. December is the wettest month (156 mm, about 13 rainy days) and July the driest (5 mm). The sea is warmest in August at 26.0°C and coolest in March at 15.1°C.

Getting there

A direct flight from London Gatwick to Kefallinia Airport (EFL, 7 km from Argostólion) 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 Lassi between 1991 and 2020 reached 37.0°C on 1 July 2017; the coldest fell to -0.4°C on 13 February 2004. In August one day in ten tops 29.9°C and about 10% of days pass 30°C; in February one night in ten drops to 7.1°C or below. The wettest single month of the period was December 2002 with 391 mm, against a December average of 156 mm.

March to May: comfortable outdoors, cooler in the sea

Spring is a good fit if you prefer being outdoors without much heat, but swimming is the compromise. March averages 15°C by day and has 10 rain days, so bring a jacket and leave room to change plans. April feels milder at 17°C, with more sunshine and less frequent rain, although the sea remains cool at 16°C. May makes the clearest move towards beach weather: daytime temperatures reach 21°C and rain becomes less frequent. Its 19°C sea may still feel brisk, especially if you like lingering in the water. Light layers are useful throughout spring, with something warmer for evenings rather than relying on summer clothing alone.

June to September: the strongest stretch for beach weather

June suits travellers who want summer warmth without choosing the hottest month. Days average 25°C, with just 2 rain days, making outdoor plans less likely to need rearranging. July brings the most sunshine, at 14 hours, while August is slightly hotter and has the warmest sea at 26°C. Both months average just 1 rain day, but shade and a break from the midday sun are sensible. Nights stay warm at 24°C, so lightweight evening clothing is usually more useful than heavy layers. September keeps daytime warmth at 25°C and the sea at 25°C, making it appealing for swimming. The catch is a rise to 6 rain days, so allow more flexibility than in midsummer.

October to February: lingering sea warmth, then wetter days

October still offers a reasonable balance for travellers who value mild warmth over reliably dry weather. Days average 22°C and the sea is warmer at 23°C, though 8 rain days make a waterproof useful. November stays mild at 18°C, but rain becomes more frequent, making fixed outdoor plans less practical. December has the most rain days, at 13, and just 4 hours of sunshine, so it is a poor choice if your priority is sitting outside in the sun. January remains cool rather than beach-warm, with daytime temperatures of 14°C. February is the coolest month, averaging 13°C by day, and its 15°C sea is unlikely to suit leisurely swimming. Pack layers and rain protection throughout winter, and treat dry spells as opportunities rather than guarantees.