Zakynthos in Summer
In summer (June, July and August), Zakynthos sees average daytime highs around 25°C and overnight lows near 24°C, with 24 mm of rain over about 3 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 22°C in early June to 26°C by late August. The sky is clear or mostly clear about 94% of the time across summer, and the air most often feels oppressive.
Summer is Zakynthos's best season of the year to visit on our travel score. For the whole year in context, see Zakynthos's year-round climate.
- Avg daytime high
- 25°C
- warmest season of the year
- Avg overnight low
- 24°C
- Rainfall
- 24 mm
- 3 wet days
- Avg wind
- 17 km/h
- Travel score
- 9.2
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Zakynthos in Summer
Over the season highs climb from about 22°C in early June to 26°C by late August.
A typical summer day in Zakynthos reaches about 25°C and drops to 24°C overnight. The warmest of the three months is August, the coolest June.
Zakynthos weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 14° / 12° | 162 | 13.9 | 9.7 | 3.7 |
| Feb | 14° / 12° | 116 | 12.1 | 10.5 | 3.8 |
| Mar | 15° / 12° | 82 | 9.9 | 11.7 | 4.6 |
| Apr | 17° / 15° | 41 | 6.2 | 12.9 | 6.0 |
| May | 20° / 18° | 18 | 3.7 | 14 | 7.7 |
| Jun | 23° / 22° | 11 | 1.4 | 14.6 | 9.1 |
| Jul | 25° / 24° | 6 | 0.5 | 14.3 | 9.5 |
| Aug | 26° / 25° | 6 | 1 | 13.5 | 9.1 |
| Sep | 25° / 23° | 66 | 6.6 | 12.3 | 8.1 |
| Oct | 22° / 20° | 114 | 8.9 | 11 | 7.2 |
| Nov | 19° / 16° | 181 | 12.6 | 10 | 5.7 |
| Dec | 15° / 13° | 181 | 14.8 | 9.4 | 4.3 |
Cloud cover in Summer
The sky is clear or mostly clear about 94% of the time across summer.
Chance of precipitation in Summer
Zakynthos gets around 24 mm of rain over 3 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 17 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 24 min in early June to 12 h 54 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 7.3 kWh/m².
Hazard calendar for Zakynthos
None of Zakynthos's seasonal hazards peak in summer. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do.
Zakynthos's rainy season runs October–March, when most of the year's rain falls.
Is summer a good time to visit Zakynthos?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is one of the better times to visit Zakynthos for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Zakynthos in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Zakynthos sees daytime highs around 25°C and nights near 24°C. Pack sun protection. Worth having: light clothes.
Sea temperature near Zakynthos in Summer
The nearest coast averages about 24°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 26°C and coldest in March near 15°C.
It's comfortable for a long swim from May 27 to Nov 20 — about 5.9 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 16 | 15 | 15 | 16 | 19 | 22 | 25 | 26 | 25 | 23 | 20 | 18 |
| Comfort | Cool | Cool | Cool | Cool | Cool | Refreshing | Warm | Warm | Warm | Refreshing | Refreshing | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 16 | Cool |
| Feb | 15 | Cool |
| Mar | 15 | Cool |
| Apr | 16 | Cool |
| May | 19 | Cool |
| Jun | 22 | Refreshing |
| Jul | 25 | Warm |
| Aug | 26 | Warm |
| Sep | 25 | Warm |
| Oct | 23 | Refreshing |
| Nov | 20 | Refreshing |
| Dec | 18 | Cool |
UV index in Zakynthos in Summer
Clear-sky midday UV across summer averages around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Zakynthos peaks around August 12 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 6 | 7 | 7 | 9 | 9 | 9 | 7 | 5 | 3 | 2 |
| Level | Low | Moderate | High | Very high | High | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 6 | High |
| Apr | 7 | Very high |
| May | 7 | High |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 9 | Very high |
| Sep | 7 | High |
| Oct | 5 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Where is Zakynthos?
Zakynthos sits at 37.8°N, 20.9°E, 0 m above sea level, in Greece. The nearest listed city is Amaliáda, 40 km away.
Topography around Zakynthos
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Zakynthos.
Within 3 km, the terrain around Zakynthos has only modest variations in elevation — a maximum elevation change of 194 m around an average of 16 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 737 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,904 m.
The land around Zakynthos is covered by water (30%), trees (29%) and grassland (23%) within 3 km, water (66%) and trees (21%) within 16 km, and water (73%) within 80 km.
Greece travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 60% of US
- price level, 2025
- GDP per capita
- $26,948
- 2025
- Happiness
- 5.7 / 10
- World Happiness, 2025
- Safe drinking water
- 97%
- of population, 2024
- Homicide rate
- 0.8
- per 100k, 2023
- Road deaths
- 8.3
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- High
- EF EPI 592
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Zakynthos (37.7802°, 20.8956°, elevation 0 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.