Weather in Mumbai in August

A hard month. August asks something of you. Go in knowing what. You should expect rain on 29 days of the month, which is more days wet than dry.

August ranks 6 of 12 in Mumbai: past the worst of the year but short of December, which is the month to book if the dates are open.

Rain on 29 of the month's 31 days, 14 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Natural fibres and a second shirt for the day. At 90% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 3.8 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest August day reached 32.2 °C and the coldest night fell to 23.3 °C, and the wettest single day dropped 229 mm — roughly 38% 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 1203 mm against 123 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 606 mm average is a reasonable planning figure, not a promise.

Wind is light at 12.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity at 90% is the real story though — it is the number that decides how the day feels, not the 28.8 °C.

How August sits in the year

Temperatures hold steady either side: 29.3 °C in July, 28.8 here, 29.8 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

August is at or near the longest days of Mumbai's year: 12.8 hours of daylight, losing 0.5 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 27.8 °C in August — warm enough that the water offers no relief from the heat. The sea peaks at 29.7 °C in May and bottoms out at 26.1 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself.

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

August in Mumbai versus nearby

If Mumbai is one option among several, the nearby comparison is worth making. Virār is a better bet in August — within a degree on temperature, 1 day less rain. Pune is close enough to be a coin toss — 2 °C cooler, 1 day less rain.

So: August is a compromise. December is 29 points better and is what Mumbai 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 Mumbai

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