Genoa is located in the Mediterranean climate zone. Average yearly temperatures are around 11 °C in January and 27 °C in August. The climate is Mediterranean, temperate, and without wide fluctuations in temperature. The average annual temperature range between maximum and minimum temperatures is just 5.4 degrees Celsius, one of the smallest ranges in all of Italy.

In general, rainfall is heaviest during the months of October and November, totalling an average of 1,300 mm annually.

The sea reaches a depth of 1,000 metres about twenty kilometres from the coast. It is mostly calm, with a tidal range of 30 cm, and warm on the surface: in September, the temperature is about 23 °C. The following table shows the maximum and minimum temperatures for each month of the year:

Month	Max	Min
January	11,1	6,1
February	11,8	6,6
March	14,1	8,8
April	16,7	11,3
May	20,4	15,0
June	23,8	18,3
July	26,7	21,1
August	27,0	21,3
September	24,1	18,3
October	20,0	14,7
November	15,1	10,2
December	12,0	7,1

(Data Centralina Storica di via Balbi, Università di Genova DISTAV)

The weather forecast provided by the ARPAL (Regional Environmental Protection Agency of Liguria) is updated daily.