Sapporo is warmest in August, averaging 25° by day and 16° at night. The wettest month is August with 192 mm, and the year brings about 1353 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | -4° | -10° | 105 mm | 4° | 9.2 h | Cool |
| February | -3° | -10° | 87 mm | 3° | 10.3 h | Cool |
| March | 2° | -6° | 78 mm | 4° | 11.6 h | Cool |
| April | 10° | -1° | 66 mm | 6° | 13.2 h | Cool |
| May | 16° | 6° | 81 mm | 11° | 14.5 h | Mild |
| June | 21° | 10° | 105 mm | 15° | 15.2 h | Mild |
| July | 25° | 15° | 93 mm | 21° | 14.9 h | Sightseeing |
| August | 25° | 16° | 192 mm | 23° | 13.8 h | Rainy season |
| September | 21° | 13° | 126 mm | 22° | 12.3 h | Mild |
| October | 14° | 5° | 152 mm | 17° | 10.8 h | Mild |
| November | 7° | -1° | 147 mm | 12° | 9.5 h | Cool |
| December | -2° | -7° | 121 mm | 6° | 8.8 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 Sapporo combines swimming warmth with dry skies.
Walking the city: July — highs of 25–25° and no more than 93 mm of rain a month.
Wet season: August — up to 192 mm in a single month.