Mumbai in September

In September, Mumbai has a daily high of 29.8 °C (85.6 °F) and a daily low of 24.9 °C (76.8 °F), as 1991-2020 model estimates; figures in brackets are converted. The daily high is a model estimate, adjusted against station records. There is no data for rain: Not published: the model failed our station test in tropical cities.

Last updated 8 November 2026: back, with ERA5-Land model estimates.

Best time to visit Mumbai: September misses our rule: days are 1.8 °C over our 28 °C (model estimates). Expect days that shorten by 31 min.

What September is like in Mumbai

Stalls go up at Mount Mary Church in Bandra for its fair each September. They sell religious objects and street food. Source: Incredible India (Ministry of Tourism), checked 8 November 2026.
On Versova beach, fisherfolk hang Bombay duck up to dry. Fishers say they dry much of it in September and October, when the catch is good. Source: Mid-day, checked 8 November 2026.
Jackals howl in the distance as BNHS scientists ring birds by night in the salt pans of Mankhurd. The work picks up from late September, after the monsoon. Source: Bombay Natural History Society (BNHS blog), checked 8 November 2026.

How we choose these portraits

Key figures

Weather in September, 1991-2020 model estimates

Daily high: 29.8 °C (85.6 °F)
Daily low: 24.9 °C (76.8 °F)
Rain: no data
Sunshine: no data

Model estimate 1991-2020, not a weather station: ERA5-Land model estimates (Copernicus), computed by City by Month for the grid cell nearest the city. Daily high: model estimate, adjusted against station records. Licence: CC BY 4.0. Checked 8 November 2026. How we make and test model estimates

Model estimate for the ERA5-Land grid cell at 19.1° N, 72.9° E, 4 km from the city centre point.

How we define and convert these figures

Notes. Rain: Not published: the model failed our station test in tropical cities. Sunshine: Not in our ERA5-Land estimates.

Daylight on 15 September 2026

Sunrise: 06:26 local time
Sunset: 18:41 local time
Day length: 12 h 15 min

Day length 1-30 September: 12 h 30 min to 11 h 59 min, -31 min.

How we compute daylight

Source: NOAA Solar Calculator equations, checked 3 October 2026.

Month by month

Each month: daily high in °C, 1991-2020 model estimates. Rain: no data.

ERA5-Land model estimates 1991-2020, as above, checked 8 November 2026.

This month against the year

Mumbai: September ranked against the 12 months
Measure	September	Rank
Daily high	29.8 °C	3rd coldest
Daily low	24.9 °C	5th warmest
Rain	no data	no data
Sunshine	no data	no data
Day length	12 h 15 min	6th longest

Equal values share a rank. How we rank months

ERA5-Land model estimates 1991-2020, as above, checked 8 November 2026.

Day length: NOAA solar equations, checked 3 October 2026.

Public holidays this month

Mumbai: public holidays in September 2026
Date	Holiday
14 September 2026 Monday	Ganesh Chaturthi

Typed from the official list and re-checked, 2 October 2026.

September 2027: no data. No official 2027 list published yet.

How we check holidays

Source: Official public holiday list (portal.mcgm.gov.in), checked 2 October 2026; holidays Python library, checked 3 October 2026. Library: holidays 0.105.

Same month in 8 model-estimate cities

Mumbai is warmer than 5 of our 8 model-estimate cities in September by mean daily high. How we rank cities

Closest high and low in September: Bangkok (1.3 °C apart), Delhi (2.3), Lisbon (5.2).

September in 8 model-estimate cities: daily high and low, monthly rain, 1991-2020 model estimates. Bars: high and low share one scale, coldest to warmest city; rain starts at zero.
City	Gap from Mumbai, °C	High, °C	Low, °C	Rain, mm	Sunshine, hours
Mumbai (this page)	—	29.8	24.9	no data	no data
Bangkok (closest)	1.3	32.1	25.2	no data	no data
Delhi (closest)	2.3	33.7	24.2	no data	no data
Lisbon (closest)	5.2	26.1	18.2	31.2	no data
Istanbul	5.7	25.2	18.2	49.0	no data
Porto	6.6	25.6	15.9	59.5	no data
Sydney	10.9	21.1	11.9	49.1	no data
Melbourne	14.7	17.4	7.9	67.4	no data

Sources (1991-2020): ERA5-Land model estimates, checked 8 November 2026. Each city's page names its grid cell. All sources in full on Methodology.

All cities in September

Sources

Attribution: Copernicus Climate Change Service (2025): ERA5 Land hourly time-series data from 1950 to present. Copernicus Climate Change Service (C3S) Climate Data Store (CDS). DOI: 10.24381/ee82e357. Accessed on the check date shown. Generated using or contains modified Copernicus Climate Change Service information 2025. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains. Licence: CC BY 4.0. Checked 8 November 2026.
NOAA Solar Calculator equations, computed locally, NOAA Global Monitoring Laboratory (method); City by Month (computation). Attribution: Computed with the NOAA Solar Calculator method (no NOAA endorsement implied). Licence: Method, not data. Checked 3 October 2026.
holidays Python library, run locally. Attribution: holidays library, Vacanza team. Licence: MIT. Checked 3 October 2026.

Official sources

Official public holiday list (portal.mcgm.gov.in). Checked 2 October 2026.

Cite this page: City by Month. "Mumbai in September: weather, daylight, holidays". https://citybymonth.com/cities/india/mumbai/september/. Last updated 8 November 2026.