Zakynthos (Zante) weather in September

September in Zakynthos: hot, a little rain, with clean air — an excellent time to visit.

Updated September 2026 · climate normals from ERA5 reanalysis

Zakynthos🇬🇷 Greece · Greece & Cyprus · Island87
  1. 52Jan
  2. 65Feb
  3. 71Mar
  4. 77Apr
  5. 84May
  6. 94Jun
  7. 92Jul
  8. 91Aug
  9. 87Sep
  10. 79Oct
  11. 59Nov
  12. 55Dec

#4 of 12 months in Zakynthos · #411 of 1413 destinations to visit in September · comfort 87/100 (tier A)

Days
29°C
Nights
19°C
Wet days
6
Sun
10.8 h
Humidity
73%
Daylight
12 h
Zakynthos, Greece
Photo: Yona Photography · Pexels

Traveller notes on Zakynthos in September

Regulars describe September here as still hot enough to sunbathe and no longer too hot to walk, with any rain arriving near the end of the month and passing quickly - our row has 72.9mm across just 6.1 days under 29C. One visitor recalls mid-30s in a mid-September week, which is what an average of 29C looks like from the top end. They are clear that this is still the season: the closures start in mid-October, not now, and the sea is at its warmest, which our 25.7C supports. Late September can still turn up turtle hatchlings making for the water, though that is the tail of it. The record: 19.2C nights, humidity 73 percent, 10.8 hours of sun and a 24 kph wind.
TheShuttersComeDownInOctober · September · 1 month ago · Read more on Tripadvisor ↗

Other months in Zakynthos

Regulars are honest this month turns genuinely hit-and-miss once underway, warm sunny days with temperatures well into the mid-20s Celsius alongside a real chance of scattered showers, sometimes heavy with thunder and lightning but rarely lasting more than 20 to 30 minutes. Our row backs that mild, genuinely wet read, 24.3C reading as a hot 25C, over 15.9C nights, with a substantial 124.3mm of rain across 8.5 days and a real 23.2 kph wind. Regulars are consistent some years stay sunny throughout while others bring more rain, a brolly and waterproof jacket the standard advice regardless of which pattern shows up. The sea itself stays warm and perfect for swimming despite the changeable skies above it. The sea sits at 24.4C. The record: 9.4 hours of sun and AQI 49.
HitAndMissSkiesSeaStaysWarmSwimmable · October · 1 month ago · Read more on Tripadvisor ↗
May here is hot and sunny without being overpowering, and regulars describe the water in a way no column can: warm enough to swim in, not warm enough to stand around in and chat. It climbs through the month - about 15C at the start, comfortable by the middle - and our monthly column averages that out at 19C. The evenings catch people out: 14.5C with a 24.2 kph breeze off the sea, so a cardigan is worth carrying even after a hot day. Rain is 21.6mm across 4.9 days and dries off quickly when it comes. The island is quiet in May, quiet enough to be pleasant rather than empty. The record: humidity 79 percent, 12.3 hours of sun and AQI 56.
WarmEnoughToSwimNotToStandIn · May · 1 month ago · Read more on Tripadvisor ↗
July is one of the driest months on Zakynthos and regulars say so flatly - our row gives 7.7mm across 0.9 precipitation days under 13.2 hours of sun a day, the most in this collection. Their temperature line is the mid-eighties Fahrenheit and often a good deal warmer, with 40C reached in high summer; our 31.6C reads as 36C because the humidity sits at 79 percent. What makes it tolerable is a pattern worth knowing: the wind gets up through the afternoon and drops away in the evening, taking the mugginess with it, which our 26.3 kph average is the flat version of. On the loggerhead turtles they are honest - the nesting beaches are Laganas, Kalamaki and Gerakas, they close during nesting and hatching, and actually seeing one is rare. The record: 21.7C nights and a 26.5C sea.
TheAfternoonBreezeCutsIt · July · 1 month ago · Read more on Tripadvisor ↗
Zakynthos-forum regulars describe June as high 20s C in the first week climbing into the low 30s by the second, with plenty of sun and a sea they put at 22 to 23C by the second half of the month - busy, but nothing like the July and August crush. The other reason to come now is the loggerheads: late May into June is named as the best time to see them, around the Laganas and Kalamaki bay or on a boat out to Marathonisi, with the standing caveat that the nesting beaches themselves - Gerakas among them - are closed to people during nesting and hatching. The record: 29.2C days that feel like 32C, 19.2C nights, 2 precipitation days, 13.2 hours of sun, a 23.7C sea and a 24 kph breeze.
LaganaNestingSeason · June · 1 month ago · Read more on Tripadvisor ↗

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Zakynthos climate normals — September

Daytime high29°C / 84°F🥵 hot
Nighttime low19°C / 67°F
Feels like (high)31°C / 88°F
Sea temperature26°C / 78°F😎 warm sea
Rainfall73 mm / 2.9 in🌦 some rain
Rainy days6 days
Humidity73%💧 humid
Dew point18°C / 64°F
Sunshine10.8 h/day
Daylight12.4 h
Wind24 km/h / 15 mph
Air quality (US AQI)50🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Zakynthos in September

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

BusySummer holidays in Greece, school holidays in 3 of the markets that fill it(estimated)

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Peak crowdsBusyShoulder seasonQuiet

Best months for Zakynthos's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Fair weatherZakynthos's weather peaks June–August.

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Best weatherFair weatherToughest weather

What's on in Zakynthos in September

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Nature

    Loggerhead nesting in Laganas Bay

    1 May – 31 OctTurtle nesting

    The bay holds one of the Mediterranean's most important loggerhead rookeries. Females come ashore from late May, the first hatchlings dig out in late July and it runs to October.

  • Rule

    Marine park beach rules

    1 May – 31 OctClosures

    Through the nesting season the park's beaches are closed from dusk to dawn, umbrellas and watersports are banned on the protected sands, and you keep to the wet strip near the water. Source ↗

  • Season

    Sea warm enough to swim

    1 Jun – 15 Oct · usually

    Ionian water is warmer and calmer than the Aegean and the meltemi barely reaches here, so the west-coast sea caves and the blue caves are swimmable from June to mid-October.

What's on around the world in September →

Nearby, and something's on

Within 300 km of Zakynthos — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Zakynthos?

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Zakynthos in September — FAQ

Is September a good time to visit Zakynthos?
September in Zakynthos: hot, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Zakynthos on SeasonMap's comfort score (87/100).
What is the weather like in Zakynthos in September?
In September, Zakynthos averages a daily high of 29°C and a low of 19.2°C, with about 72.9 mm of rain over roughly 6.1 rainy days.
What is the air quality in Zakynthos in September?
Zakynthos has a mean US Air Quality Index of about 50 in September.

Within 300 km: Kefalonia's Loggerhead turtles around 1 May – 15 Sep, and Corfu's Cricket on the Spianada around 1 May – 15 Sep.