Sendai has a humid subtropical climate , which features warm and wet summers, and cool and dry winters. Sendai summers are not as hot as Tokyo to the south, while the winters are much milder than Sapporo to the north, but retains significant seasonal differences in temperature and rainfall. Extremes range from −11.7 to 37.2 °C (10.9 to 99.0 °F). Of Japan’s prefectural capitals, Sendai experiences the fewest days of extreme temperatures (highs outside 0–30 °C (32–86 °F)) at 19.6 per year, compared to Tokyo’s average of 49.
Winters are cool and relatively dry, with January temperatures averaging 1.5 °C (34.7 °F). Snowfall is much lower than cities on the Sea of Japan coast, such as Niigata and Tottori. Summers are very warm and much of the year’s precipitation is delivered at this time, with an August average of 24.1 °C (75.4 °F). The city is rarely hit by typhoons, and experiences only 6 days with more than 10 centimetres (4 in) of rainfall on average. Sendai’s monsoon season usually begins in late April to early October, which is later than in most cities in Japan. During this season, cold winds from the Okhotsk air mass, called “Yamase”, blow in and depress daytime highs.