Dalian is warmest in August, averaging 27° by day and 24° at night. The wettest month is July with 267 mm, and the year brings about 1177 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 1° | -4° | 12 mm | 5° | 9.6 h | Cool |
| February | 2° | -3° | 17 mm | 3° | 10.5 h | Cool |
| March | 6° | 1° | 34 mm | 4° | 11.7 h | Cool |
| April | 12° | 6° | 45 mm | 7° | 13.0 h | Cool |
| May | 17° | 13° | 105 mm | 12° | 14.1 h | Sightseeing |
| June | 22° | 18° | 120 mm | 19° | 14.7 h | Mild |
| July | 26° | 23° | 267 mm | 24° | 14.5 h | Rainy season |
| August | 27° | 24° | 226 mm | 26° | 13.5 h | Rainy season |
| September | 24° | 20° | 162 mm | 23° | 12.2 h | Mild |
| October | 18° | 13° | 87 mm | 18° | 11.0 h | Sightseeing |
| November | 11° | 6° | 90 mm | 13° | 9.8 h | Cool |
| December | 3° | -1° | 12 mm | 9° | 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 Dalian combines swimming warmth with dry skies.
Walking the city: May and October — highs of 17–18° and no more than 105 mm of rain a month.
Wet season: July and August — up to 267 mm in a single month.