Genoa, where it's located

The climate of Genoa, capital of the Italian region of Liguria, is Mediterranean, with mild and rainy winters, and hot and sunny summers. The city is located in northern Italy, but on the coast, and it's clearly separated from the Po Valley by the Apennines, so together with the rest of the Ligurian Riviera it has a much milder climate.
The wind is quite frequent, since in periods of bad weather a depression often forms right on the Gulf of Genoa, which draws to the city a moderate or strong wind from the northeast, able to lower the temperature.
Here are the average temperatures.
Genoa - Average temperatures
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Min (°C)6681114182121181497
Max (°C)121215172124272824201513
Min (°F)434346525764707064574845
Max (°F)545459637075818275685955

The rains in Genoa are quite abundant, given that they exceed 1,000 millimetres (40 inches) per year; in particular, autumn is very rainy, when the sea is still warm, and the first disturbances are capable of causing heavy rains, which in turn can lead to flooding of the streams coming down from the Apennines and passing through the city, especially in late September and in October. October is the wettest month, with as many as 170 mm (6.7 in) on average. Summer is the driest season, but only in July, when Atlantic depressions are rarest, precipitation drops below 30 mm (1.2 in).
Here is the average precipitation.
Genoa - Average precipitation
MonthJanFebMarAprMayJunJulAugSepOctNovDecYear
Prec.(mm)10075809070602570135170110951080
Prec.(in)3.933.13.52.82.412.85.36.74.33.742.5
Days86787535687777

Winter, from December to February, is mild; in particular, periods of good weather are pleasant, when the sun shines, while the Po Valley is shrouded in fog. Instead, in periods of bad weather, with the north-east wind blows, the cold air of the Po Valley manages to climb over the Apennines and reaches the city, so there can be cold and rainy days. On colder periods, for the same reason it may even snow, although the snow tends to melt quickly, because of the warming influence of the sea; in fact, night frosts are rare, and usually light.

Spring, from March to May, is mild and gradually becomes more sunny, but it is also quite rainy. March and the first half of April are unstable periods, in which the first mild and sunny days alternate with colder and rainy days. In April and May, while in the rest of Italy the first very mild days occur, with highs above 20 °C (68 °F), sometimes on the Ligurian coast a layer of clouds can form, able to keep the temperature cool, around 15 °C (59 °F) even during the day.

Summer, from June to August, is hot and sunny. Generally the heat is not excessive, due to the influence of the sea and to the breeze, but we cannot exclude some particularly sultry periods. Some disturbances may pass also in the summer, especially in June and in late August, while on sunny days some thunderstorms may reach the coast from the interior.

Autumn, from September to November, is mild and humid, with sunny days, but also periods of bad weather, in which as we have said it can rain a lot.

Genoa

The amount of sunshine in Genoa is good in summer, when clear skies prevail, while in the rest of the year, sunny periods alternate with periods of cloudy skies.
Genoa - Sunshine
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Hours4456781097644

The sea, in Genoa and in nearby towns, such as Rapallo and Chiavari, becomes warm enough for swimming in July and especially in August, when it reaches 25 °C (77 °F), while in June the Ligurian Sea is still cool.
Here are the average sea temperatures.
Genoa - Sea temperature
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Temp (°C)131313141720232522191614
Temp (°F)555555576368737772666157

In the hills north of Genoa the climate is much colder, already at altitudes of a few hundred metres, as you can see from the average temperatures of the Giovi Pass, 475 metres (1,560 feet) above sea level.
Passo Giovi - Average temperatures
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Min (°C)-2126912141411830
Max (°C)571014172124242016107
Min (°F)283436434854575752463732
Max (°F)414550576370757568615045

When to go


The best times to visit Genoa are spring and early summer, in particular from mid-April to mid-June. September is also a good month, especially in the first half, because later the risk of heavy rainfalls increases.
In the height of summer, in July and August it can be hot, although less frequently than in other parts of Italy.
For a beach holiday on the Ligurian Riviera, the best months are just July and August.