Weather in Dalian

Rain is wet season runs from June to August, inside an annual total of 668 mm. The wettest month is August at 170 mm; the driest is January at 6 mm.

Dalian is in China at 38.9°N. The 2001–2020 NASA POWER daily record describes a continental climate with a wide temperature swing. August is the warmest month (average 24.9°C, high 26.4°C) and January is the coolest (average -2.1°C, low -4.1°C). On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are June, July, and September.

Best months to visit Dalian

The three months with the highest comfort score are June, July, and September: June (19.9°C average, 78 mm, 80% humidity); July (23.7°C average, 144 mm, 84% humidity); September (21.5°C average, 54 mm, 72% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the wet season itself — fewer crowds, greener landscape, heavier rain — aim at June–August instead of the score.

Temperature through the year

Monthly average highs run from -0.1°C in January to 26.4°C in August. Nights follow the same curve: -4.1°C in January and 23.3°C in August.

Mean high across all twelve months is 13.5°C and mean low is 9.5°C. These are 20-year grid averages, so a city station can read a few degrees warmer or cooler.

Rainfall pattern

The wet season in Dalian starts in June and ends in August (June, July, and August). August is the core of it at 170 mm. January is the other extreme, with 6 mm.

A rainy day here is a day with at least 1 mm in the NASA POWER series. August averages 12 such days; January averages 2.

What stands out month by month

The year bottoms out in January. Plan for -4.1°C at night and -0.1°C in the afternoon. February: 1.3°C high, -2.7°C low, 12 mm rain, 70% humidity. In March, Dalian averages 5.4°C by day and 1.1°C at night, with 12 mm of rain. April brings 43 mm and 5 rainy days; temperatures run from 6.3°C to 10.9°C. May stands apart from the months beside it: 16.9°C / 12.4°C and 62 mm. The wet season opens in June. Expect 78 mm and 9 rainy days, with nights around 18.0°C.

In July, Dalian averages 25.3°C by day and 22.2°C at night, with 144 mm of rain. By August the wet season is ending. Dalian still sees about 170 mm, but the next month is usually leaner. September stands apart from the months beside it: 23.4°C / 19.7°C and 54 mm. October stands apart from the months beside it: 17.4°C / 13.3°C and 42 mm. November brings 35 mm and 4 rainy days; temperatures run from 5.5°C to 9.8°C. In December, Dalian averages 3.0°C by day and -1.2°C at night, with 11 mm of rain.

How Dalian compares inside China

Weifang is about 329 km away: Dalian is 2.6°C cooler than Weifang in its hottest month and a similar annual rainfall (664 mm in Weifang). Weifang’s wettest month is July (168 mm) versus August here.

Shenyang is about 356 km away: Dalian is 0.5°C cooler than Shenyang in its hottest month and 48 mm wetter over the year than Shenyang. Shenyang’s wettest month is August (153 mm) versus August here.

Tianjin is about 383 km away: Dalian is 2.8°C cooler than Tianjin in its hottest month and 135 mm wetter over the year than Tianjin. Tianjin’s wettest month is July (156 mm) versus August here.