Sendai is warmest in August, averaging 29° by day and 19° at night. The wettest month is July with 279 mm, and the year brings about 1705 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 0° | -7° | 124 mm | 11° | 9.6 h | Cool |
| February | 1° | -7° | 92 mm | 9° | 10.5 h | Cool |
| March | 7° | -3° | 102 mm | 9° | 11.7 h | Cool |
| April | 14° | 2° | 105 mm | 11° | 13.0 h | Mild |
| May | 19° | 8° | 109 mm | 15° | 14.1 h | Mild |
| June | 24° | 13° | 138 mm | 19° | 14.6 h | Mild |
| July | 27° | 18° | 279 mm | 23° | 14.4 h | Rainy season |
| August | 29° | 19° | 152 mm | 26° | 13.5 h | Mild |
| September | 24° | 15° | 174 mm | 24° | 12.2 h | Mild |
| October | 17° | 8° | 115 mm | 20° | 11.0 h | Mild |
| November | 11° | 2° | 144 mm | 17° | 9.9 h | Cool |
| December | 3° | -3° | 171 mm | 14° | 9.3 h | Cool |
High and low are average daily maximum and minimum, rain is typical monthly total, sea is the average surface temperature, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER and NOAA MUR — averages, not promises.
When to go
Beach weather: No month in Sendai combines swimming warmth with dry skies.
Wet season: July — up to 279 mm in a single month.