Found some weather forcasts not too bad
Weather conditions in Zakynthos
Apr. May Jun. Jul Aug. Sep Oct
Day temperatures in °C 19 24 28 31 32 28 23
Night temperatures in °C 9 12 16 18 18 16 13
Sunshine in hours per day 7 9 10 12 11 8 7
Rainfall 8 4 2 1 1 5 9
Relative humidity in % 62 61 58 56 59 62 65
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