Cities in September
In September, Singapore is the warmest of our 15 cities by mean daily high, at 31.6 °C, and Amsterdam the coolest, at 19.2 °C, as 1991-2020 means. Los Angeles is the driest, with 3.3 mm of rain, and Hong Kong the wettest, with 321.4 mm (14 cities have rain data).
Last updated : first sourced version.
Cities that meet our rule in September
Rule: daily high over 16 °C and up to 28 °C, low 8 °C or more, rain 150 mm or less. Means hide hot, cold and wet days. No data on crowds, prices or events. How we test each month
September in 15 cities
Warmest first, by mean daily high. How we rank cities
| City | High, °C | Low, °C | Rain, mm | Sunshine, hours |
|---|---|---|---|---|
| Singapore | 31.6 | 25.2 | 124.9 | no data |
| Hong Kong | 30.5 | 26.1 | 321.4 | 174.4 |
| Osaka | 29.5 | 21.9 | 152.8 | 161.6 |
| Los Angeles | 28.3 | 17.9 | 3.3 | no data |
| Tokyo | 27.5 | 20.3 | 224.9 | 126.7 |
| Barcelona | 26.7 | 18.8 | 86.1 | 202.9 |
| Rome | 26.7 | 16.0 | no data | no data |
| New York | 24.6 | 16.8 | 109.5 | no data |
| Paris | 21.5 | 13.0 | 44.7 | 174.0 |
| Vienna | 21.1 | 12.0 | 64.1 | 191.7 |
| London | 20.2 | 12.3 | 49.8 | no data |
| Prague | 20.1 | 9.9 | 41.8 | 164.6 |
| Berlin | 19.9 | 10.9 | 46.6 | 166.6 |
| Buenos Aires | 19.7 | 10.6 | 80.6 | 178.9 |
| Amsterdam | 19.2 | 11.0 | 84.4 | 154.2 |
Sources (1991-2020): WMO climate normals and NOAA U.S. Climate Normals, checked ; Hong Kong: our 1991-2020 mean of the Hong Kong Observatory daily climate series on DATA.GOV.HK; Singapore: our 1991-2020 mean of the National Environment Agency monthly climate series on data.gov.sg; both checked . Each city's page names its station. All sources in full on Methodology.
Hong Kong figures: The Government of the Hong Kong Special Administrative Region and the Hong Kong Observatory own the intellectual property rights in the data. With attribution to the Government of the Hong Kong Special Administrative Region, the Hong Kong Observatory and DATA.GOV.HK. Licence: Terms and Conditions of Use of DATA.GOV.HK, version 1.2.
Singapore figures: Contains information from Surface Air Temperature - Monthly Mean Daily Maximum, Surface Air Temperature - Monthly Mean Daily Minimum and Rainfall - Monthly Total, accessed on the check date shown from the National Environment Agency on data.gov.sg, which is made available under the terms of the Singapore Open Data Licence version 1.0 (https://data.gov.sg/open-data-licence). The Agency does not endorse our means.
10 more cities have no climate source we can use yet, so no month pages: all cities, by country.
Sources
The table's sources are named under it. All sources in full on Methodology.
Cite this page: City by Month. "Cities in September: temperature, rain and sun". https://citybymonth.com/months/september/. Last updated 31 October 2026.