The following is the monthly breakdown of the weather in Mumbai.
January January is the coolest month of the year for Mumbai, with the mean daily minimum being 16.4 °C and the mean daily maximum being 30.1 °C. The nightly lows may vary between 13 °C and 20 °C. Chilly northern winds during the day make the city seem cooler than it is. Generally, clear skies, with some
smog – especially in the early morning – are the norm. The days are dry, and the nights relatively
humid. January is also associated with the
deciduous trees in the city shedding their leaves. On 26–27 January 2008, recorded a minimum temperature of 10.2 °C, which is the lowest recorded in 45 years. The lowest recorded temperature is 7.4 °C (45.3 °F) on 22 January 1962, which was the coldest day in Mumbai. Coastal areas are relatively cooler during the day, but they are warmer at night.
February The fine January weather continues for the first fortnight of February. The mean daily minimum stays at 17.3 °C and the mean daily maximum is 31.3 °C with some possibility of unseasonable showers.
March The month of March sees a mean minimum temp of 20.6 °C and a mean maximum temp of 32.7 °C.
April The temperatures and humidity are still high. However, the cooling effect of the sea breezes makes its presence felt. The high temperature stays around 35.1 °C and daily lows are around 23.2 °C. Plants are in full bloom in April.
May May is the hottest month of the year for Mumbai with the cool sea breezes providing some relief. The daily maximum hovers around 34.5 °C and the daily low is 29.1 °C. This period is marked by
thunderstorms and often windy conditions as the monsoon establishes itself over the city. Rainfall activity intensifies as the month goes on, leading into the wettest month, July. The max and min mean daily temperatures are measured at 31.9 °C/26.6 °C. The highest 24-hour rainfall in the history of Mumbai was recorded at the Santacruz observatory of the
India Meteorological Department on 26 July 2005. On this day, a
record 944 mm rainfall fell over the city, causing large-scale flooding, claiming several lives and causing large-scale
property damage.
August The weather in August is almost identical to July. Towards the latter half of the month, rainfall activity tends to lessen. The coolest days of the monsoon season are often in August. The max temperature might drop to 29.3 °C during the day and 24.5 °C at night.
September In September the intensity of rainfall decreases. The monsoons officially end in the 3rd week of September. September has unsettled weather. The rainfall is short and light and is not continuous. The end of the monsoon, much like the beginning can feature heavy thunderstorms associated with the withdrawal of the monsoon current from the city and surrounding areas. The mean maximum daily temperatures reach 30.1 °C while daily mean minimum temperature stays at 24.0 °C.
October In the month of October, the mean daily maximum stays at around 32.9 °C and the mean daily minimum stays at 23.1 °C making it hot during the days and relatively mild during the nights.
November The temperature continues to drop slowly in the month of November with the mean daily minimum staying at 20.5 °C and the mean daily maximum staying around 33.4 °C. There are a few unseasonable showers.
December The day highs hover around 32.4 °C. The nights average around 18.2 °C. Humidity is low in December. == Climate change ==