Nicolás Romero weather in September
In September, Nicolás Romero has daytime highs averaging 20 °C, nights around 11 °C, with 19 wet days. Figures are 1991–2020 climate normals.
- 20.0°C Average high
- 11.3°C Average low
- 19days Wet days
- 136mm Rainfall
- 12h Daylight
Daily temperatures through September
How September develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 September | 20.2 °C | 11.4 °C | 67 % |
| 11–20 September | 20.3 °C | 11.5 °C | 61 % |
| 21–30 September | 19.8 °C | 11.0 °C | 61 % |
- Rain is most likely over days 1–10 of September (67 % of days) and least likely over days 21–30 (61 %).
What to expect
| Measure | Typical September | Share of the month |
|---|---|---|
| Days above 25 °C | 0 of 30 | 0 % |
| Days above 30 °C | 0 of 30 | 0 % |
| Days below 0 °C | 0 of 30 | 0 % |
| Days with more than 1 mm rain | 19 of 30 | 63 % |
Conditions in September
| Measure | Average |
|---|---|
| Mean temperature | 15 °C |
| Record high (1991–2020) | 25 °C |
| Record low (1991–2020) | 2.9 °C |
| Relative humidity | 81 % |
| Wind speed | 15 km/h |
| Cloud cover | 79 % |
Where Nicolás Romero ranks in September
| Ranking | Position | Value |
|---|---|---|
| The coolest places in North America in September | 21st of 50 | 20 °C |
September compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| July | 20.8 °C | 121 mm | 74 % |
| August | 21.0 °C | 118 mm | 75 % |
| September | 20.0 °C | 136 mm | 79 % |
| October | 19.7 °C | 74 mm | 67 % |
| November | 19.5 °C | 23 mm | 49 % |
See all twelve months for Nicolás Romero
- September is the 8th warmest month here.
- It is the 12th driest month of the year.
- It ranks 12th for least cloud cover.
- Days last about 12 hours from sunrise to sunset.
- It rains on 19 of 30 days — 63 % of the month.
- Nights are about 8.7 °C cooler than the middle of the day.
- The hottest September day on record since 1991 reached 25 °C, 5.0 °C above the usual daytime high.
QuestionsSeptember in Nicolás Romero, answered
How warm is Nicolás Romero in September?
Daily highs average 20 °C and nights fall to about 11 °C, a spread of 8.7 °C between afternoon and dawn. That makes September the 7th warmest month of the year here.
Does it rain much in Nicolás Romero in September?
September averages 136 mm of rain, spread over about 19 of the 30 days — 63 % of the month. Cloud cover averages 79 % of the sky.
How long are the days in September?
Nicolás Romero averages 12 hours between sunrise and sunset in September. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.