Honshu, map

The climate of Kyoto, the ancient Japanese capital, located in the southern part of Honshu Island, is temperate humid, with quite mild winters and hot, moist, and rainy summers. Like the rest of Japan, the city is affected by the monsoon circulation: in winter, the northwest cold currents will prevail, while in summer, they will be replaced by hot and humid currents of tropical origin.
The city is located about 50 kilometers (30 miles) away from the sea, in a plain surrounded by low mountains, and to the south, it is practically merged with Osaka and Kobe, in a large metropolitan area called Keihanshin.

Kiyomizu-dera Temple and panorama

In winter, there are fairly mild periods, with highs above 10 °C (50 °F), alternating with cold periods, with wind and rain, highs around 5/7 °C (41/45 °F) or less, and possible falls of sleet or snow. Snowfalls, however, are usually light, as are nocturnal frosts.
Summers in Kyoto are particularly hot and humid, both because of the distance from the sea and because of the heat island effect which is typical of big cities. There can be periods of good weather, with maximum temperatures around 35 °C (95 °F) or above, tropical nights and high humidity, but also periods of bad weather due to the summer monsoon. August is the hottest month, both because of the thermal inertia of the sea and because of the lower frequency of periods of bad weather. Here are the average temperatures.
Kyoto - Average temperatures
Min (°C)114914192324201483
Max (°C)91013202528323329231712
Min (°F)343439485766737568574637
Max (°F)485055687782909184736354

Rainfall is quite abundant, in fact, it amounts to 1,500 millimeters (60 inches) per year. Winter is undoubtedly the driest season, at least in quantity; the rainiest months are June and July, ie the first period of the rainy season (called Baiu). In August, there is a certain decrease in rain frequency: on average, among the summer months, it is the hottest as well as the driest and sunniest. Here is the average precipitation.
Kyoto - Average precipitation

From June to October (but especially from August to early October), Kyoto may be affected by typhoons, the tropical cyclones of Southeast Asia.
The cherry blossoming in Kyoto occurs around April 3rd: you can take advantage of this period to visit the Buddhist temples that are located around the city (and maybe, nearby Lake Biwa), or you can go from mid-November to early December, when the trees take on the beautiful autumn colors. That of Kyoto is indeed one of the best areas for the so-called momijigari, the hunt for red maples in autumn.

Temple in autumn in Kyoto

The amount of sunshine in Kyoto, all things considered, is decent in winter, but it never becomes very good, however, there are two relative maxima, one in spring (April-May) and the other in August, after the Baiu rains, both with around 6 hours of sunshine per day. Here are the average sunshine hours per day.
Kyoto - Sunshine