Weather in Mumbai in May

The month to avoid. Of the twelve, May is the one to avoid. Daytime highs average 38.5 °C and the afternoon is not negotiable — outdoor plans move to early morning or evening.

May ranks 12 of 12 — near the bottom of Mumbai's year. December is the month that works, and the swing between the two is 47 points, which is a different holiday rather than a slightly better one.

Rain falls on only 3 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for heat management rather than style: shade, water, and a schedule that gives up on the middle of the day.

What the averages hide

Averages flatten a month, and this one hides a few things: 30 days of the month clear 35 °C — that is not a heatwave, it is the month. Across the twenty years measured, the hottest May day reached 45.4 °C and the coldest night fell to 23.3 °C, and the wettest single day dropped 124 mm — roughly 564% of the month's rain in one day.

This is the volatile part. May rainfall has ranged from 0 mm to 183 mm across the twenty years measured — a 183 mm spread around an average of 22 mm. The average is real but almost no individual May looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 10.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 60%.

How May sits in the year

Temperatures hold steady either side: 40 °C in April, 38.5 here, 32.6 in June. Nothing about the timing within the month matters much. Rain is the thing that moves: June brings 20 days more of it, so the earlier half of a flexible trip is the safer half.

Daylight in May

May is at or near the longest days of Mumbai's year: 13 hours of daylight, gaining 0.4 hours across the month. Evenings are the real gain — dinner outdoors still happens in full light.

Sea temperature

The sea sits at about 29.7 °C in May — 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.

May in Mumbai versus nearby

If Mumbai is one option among several, the nearby comparison is worth making. Virār is a better bet in May — 8.5 °C cooler, the same number of rain days. Pune is close enough to be a coin toss — within a degree on temperature, 1 day more rain.

So: May is a compromise. December is 47 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 May.