Zakynthos' climate is predominately characterised by its warm summers and mild winters. With Rhodes in the Aegean Zakynthos shares the top sunniest place in the whole country. Zakynthos has an average of 300 sunny days annually. Average lowest temperatures are in January (11C) and highest in August (26C). However, lows can approach freezing temperatures and highs can reach 38C and even 40C during the occasional heat wave.