The best time to visit Alonissos is from June to mid-September when the sky is sunny and temperatures average a warm 25°C (77°F).
The summer months of July and August average 26°C (78°F), reaching highs of 29°C (84°F), but are perhaps best avoided as large crowds of European and Greek holidaymakers swamp Alonissos and the Sporades islands during the European summer holidays.
Mid-season (May, September and October) offers reasonable hotel prices and generally less crowds.
Alonissos enjoys a Mediterranean climate with long, hot and dry summers with mild, wet winters. Despite winter rainfall, Alonissos is considered a year-round destination, however, the Sporades are not as hot as the Cyclades.
Summer, from June to mid-September, is hot and sunny, with little or no rainfall; maximum temperatures hover around 29°C (84°F), and occasionally higher.
Autumn, from mid-September to November, is pleasantly warm before gradually becoming cooler and windy by November.
Winter, from December to mid-March, is generally cold: the maximum temperature averages 12°C (54°F), with moderate to strong winds. Occassionally, it can snow. Rainfall is frequent – December sees the most rainfall during the year.
Spring, from mid-March to May, begins cold, windy and wet, before gradually become warmer.
High season: July and August, when hotel and restaurant prices sky-rocket.
Mid season: From March to June and from September to October – the temperature is cooler, hotel prices are more reasonable and the crowds non-existent.
Note: The winter off-season, from November through February, is generally quiet everywhere; many hotels, restaurants and bars close down and the beaches are deserted. Ferry and air services are dramatically reduced.
|Ave Temp (°C)||10||10||12||15||19||24||26||25||23||18||15||12|
|Ave High Temp (°C)||12||13||15||18||22||26||29||29||25||21||17||14|
|Ave Low Temp (°C)||7||7||9||11||15||19||22||22||19||15||12||9|
|Sunshine (Hrs daily)||4||5||6||8||10||12||13||12||10||7||5||4|
|Daylight (Hrs daily)||10||11||12||13||14||15||15||14||13||11||10||9|
|Ave Humidity (%)||63||63||59||58||55||55||54||57||57||63||65||64|
|Days with some Rain||18||19||12||10||6||6||0||1||6||13||12||22|
|Ave Rainfall (mm)||69||79||56||28||28||25||0||8||50||58||41||124|
|Sea Temp (°C)||14||14||14||14||18||21||25||26||24||21||18||15|
|(Alonissos Town, Alonissos)||J||F||M||A||M||J||J||A||S||O||N||D|
Note: Meteorological data is sourced from the United States National Oceanic and Atmospheric Administration (NOAA) and the World Meteorological Organization (WMO), with additional historical climate data sourced from the Hellenic National Meteorological Service (HNMS).
Latest update: Best time to visit Alonissos: 7 January, 2019
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