Yokohama is warmest in August, averaging 30° by day and 23° at night. The wettest month is June with 258 mm, and the year brings about 1839 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 9° | -2° | 59 mm | 15° | 9.9 h | Cool |
| February | 10° | -1° | 67 mm | 14° | 10.7 h | Cool |
| March | 14° | 2° | 146 mm | 14° | 11.7 h | Mild |
| April | 18° | 7° | 159 mm | 16° | 12.9 h | Mild |
| May | 22° | 12° | 174 mm | 19° | 13.9 h | Mild |
| June | 26° | 17° | 258 mm | 22° | 14.4 h | Rainy season |
| July | 29° | 21° | 242 mm | 25° | 14.2 h | Rainy season |
| August | 30° | 23° | 220 mm | 27° | 13.3 h | Rainy season |
| September | 27° | 19° | 204 mm | 26° | 12.2 h | Rainy season |
| October | 21° | 12° | 186 mm | 23° | 11.1 h | Rainy season |
| November | 17° | 6° | 84 mm | 20° | 10.1 h | Sightseeing |
| December | 11° | 1° | 40 mm | 17° | 9.6 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 Yokohama combines swimming warmth with dry skies.
Walking the city: November — highs of 17–17° and no more than 84 mm of rain a month.
Wet season: June, July, August, September and October — up to 258 mm in a single month.