Weather in Shanghai in August

A hard month. August asks something of you. Go in knowing what. You should expect rain on 17 days of the month, which is more days wet than dry.

August ranks 12 of 12 — near the bottom of Shanghai's year. October is the month that works, and the swing between the two is 42 points, which is a different holiday rather than a slightly better one.

Rain on 17 days, 5 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 31.8 °C days and 25.7 °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: 24 days top 30 °C, making the heat continuous rather than occasional. Across the twenty years measured, the hottest August day reached 39.5 °C and the coldest night fell to 19.8 °C, and the wettest single day dropped 95 mm — roughly 55% of the month's rain in one day.

August is moderately variable: 36 mm in the driest year against 298 mm in the wettest, around an average of 173 mm. Roughly two Augusts in three land near that average, and the third does something else entirely.

Wind is light at 14.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 80%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 31.9 °C in July, 31.8 here, 28.2 in September. Nothing about the timing within the month matters much. Rain is the thing that moves: September brings 5 days less of it, so pushing the dates later buys drier weather.

Daylight in August

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

Sea temperature

The sea sits at about 27.5 °C in August — warm enough that the water offers no relief from the heat. This is the warmest the water gets all year.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

August in Shanghai versus nearby

If Shanghai 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, the same number of rain days. Nanjing is close enough to be a coin toss — within a degree on temperature, 2 days less rain.

So: August is a compromise. October is 42 points better and is what Shanghai 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 Shanghai

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