Weather in Nanjing in August

A hard month. August asks something of you. Go in knowing what. You should expect rain on 15 days of the month, which is more days wet than dry.

August ranks 10 of 12 — near the bottom of Nanjing's year. October is the month that works, and the swing between the two is 46 points, which is a different holiday rather than a slightly better one.

Rain on 15 days, 5 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 31.9 °C days and 24.1 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 23 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest August day reached 40.5 °C and the coldest night fell to 17.1 °C, and the wettest single day dropped 123 mm — roughly 79% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 275 mm against 56 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 155 mm average is a reasonable planning figure, not a promise.

Wind is light at 8.9 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 81%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 32.2 °C in July, 31.9 here, 28.5 in September. Nothing about the timing within the month matters much. Rain is the thing that moves: September brings 6 days less of it, so pushing the dates later buys drier weather.

Daylight in August

13.4 hours of daylight, losing 0.8 hours across the month. That is between Nanjing's extremes of 14.2 and 10.1 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 34.2 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

August in Nanjing versus nearby

If Nanjing is one option among several, the nearby comparison is worth making. Hangzhou is close enough to be a coin toss — within a degree on temperature, 2 days more rain. Shanghai is close enough to be a coin toss — within a degree on temperature, 2 days more rain.

So: August is a compromise. October is 40 points better and is what Nanjing is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Nanjing

See all twelve months in Nanjing, or where else to go in August.