Weather in Mumbai city of Maharashtra- India

The period between October and February is the most pleasant time to visit Mumbai, when the city enjoys a balmy season of blue skies and a cool breeze. From March, the temperature gradually rises and the humidity reaches saturation point. It is very hot just before the monsoon rains break in mid-June. The rains last until September. They come as a welcome relief to Bombayites but when the drainage system fails everyone encounters difficulties getting around town. After the initial few days of flooded roads, however, Bombayites take the downpours and regular drenching in their stride. In September, the humidity and temperature begin to fall. Luckily Mumbai does not suffer from the incessant power cuts that plague other parts of India, so offices and hotels remain air-conditioned and bearable through the hot months.

The city, being in the tropical zone and near the Arabian Sea, does not experience distinct seasons, but the climate can broadly be classified into two main seasons - the humid season and the dry season. The humid season, between March to October, is characterized by high humidity and temperatures of over 30 °C (86 °F). The monsoon rains lash the city during June to September and supply most of the city's annual rainfall of 2,200 mm (85 in). The maximum annual rainfall ever recorded was 3,452 mm (135.89 in) in 1954[5]. The highest rainfall recorded in a single day was 944 mm (37.16 inches) on 2005-07-26.

Moderate levels of humidity and warm to cool weather characterize the dry season, between November and February. Cold northerly winds are responsible for a high wind chill factor during January and February. The annual temperatures range from a high of 38 °C (100 °F) to a low of 11 °C (52 °F). The record high is 43 °C (108 °F) and record low is 7.4 °C (45 °F) on 1962-01-22.

Climate and Clothing
The period between October and February is the most pleasant time to visit Bombay, when the city enjoys a balmy season of blue skies and a cool breeze. From March, the temperature gradually rises and the humidity reaches saturation point. It is very hot just before the monsoon rains break in mid-June. The rains last until September. They come as a welcome relief to Bombayites but when the drainage system fails everyone encounters difficulties getting around town. After the initial few days of flooded roads, however, Bombayites take the downpours and regular drenching in their stride. In September, the humidity and temperature begin to fall. Luckily Bombay does not suffer from the incessant power cuts that plague other parts of India, so offices and hotels remain air-conditioned and bearable through the hot months.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max C	31	32	33	33	33	32	30	29	30	32	33	32
Min C	16	17	20	24	26	26	25	24	24	23	20	18
Max F	88	90	91	91	91	90	86	84	86	90	91	90
Min F	61	63	68	75	79	79	77	75	75	73	68	64

Average Rainfall in Mumbai

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
mm	0	1	0	0	20	647	946	660	309	117	7	1
in	0	0	0	0	0.8	25.5	37.2	26	12.2	4.6	0.3	0

Medicines
Most medicines are available in Bombay, but it is always sensible to take a small reserve stock of any prescription drugs. You may also want to put together a basic medical kit in advance of departure; this could usefully include something against 'Delhi Belly', antiseptic cream, lip salve, mosquito repellent and soothing cream for bites, suntan lotion for long days on Goa's beaches, water purification tablets if bottled water is not available and elastoplast. Some travellers develop a problem on their second or third day in India because of a lack of acclimatization or heat exhaustion, rather than a reaction to the change in food and water. They are advised to drink lots of fluids (water with a little salt and sugar) and keep to a diet of rice and yoghurt for a couple of days to give their system time to adjust. If an upset stomach persists, seek medical advice (tourist-class hotels have a doctor on call).

There are a few things not to do which will make your stay more enjoyable. Never drink tap water (the flasks in hotel rooms contains filtered water and bottled water is now availble almost everywhere). Avoid salads, even in hotels, and do not eat the street food until you know how much you can afford to abuse your body for the sake of your palate.

Time Zone
Despite its size, India has a single time zone. It is 2-1/2 hours behind Hong Kong and Singapore, 5-1/2 hours ahead of London (GMT), 4-1/2 hours ahead of British Summer Time, 10-1/2 hours ahead of New York and 13-1/2 hours ahead of San Francisco.