Weather in Rome in September

Daylight on the 15th: 12 h 30 min
Average high: 28 °C (82 °F)
Average low: 17 °C (63 °F)
Precipitation: 72 mm

In September, the area around Rome averages daytime highs of 28 °C (82 °F) and night-time lows of 17 °C (63 °F). Days are warm enough for light clothing.

Temperature

Compared with August, September is cooler by 5 °C in daytime highs, and October is cooler by 5 °C than September. The daily average is 22 °C (72 °F).

Precipitation, humidity and wind

Precipitation averages about 72 mm over the month, with 8 days of at least 1 mm. Expect some wet days, but not every day.

Relative humidity averages 64 % and wind at 2 m about 2.1 m/s.

Daylight

On 15 September the sun rises at 06:50 and sets at 19:20 local time, for 12 h 30 min of daylight, 83 minutes less than a month earlier.

About these numbers

The figures are 2011-2020 averages for the grid cell around Rome from the NASA POWER project, a model based data set. They describe the area rather than one weather station, and a single year can differ.

Month by month

Month	High	Low	Precipitation
January	12 °C	4 °C	71 mm
February	13 °C	4 °C	90 mm
March	16 °C	6 °C	79 mm
April	20 °C	9 °C	53 mm
May	23 °C	12 °C	59 mm
June	29 °C	17 °C	37 mm
July	32 °C	20 °C	32 mm
August	33 °C	21 °C	26 mm
September	28 °C	17 °C	72 mm
October	23 °C	13 °C	88 mm
November	17 °C	9 °C	115 mm
December	13 °C	5 °C	75 mm

Questions

How warm is Rome in September?

Average highs of 28 °C (82 °F) and lows of 17 °C (63 °F) (2011-2020 averages).

Does it rain a lot in Rome in September?

About 72 mm over the month, on 8 days with at least 1 mm.

Travel data for Italy

Sources

NASA Langley Research Center POWER Project, funded through the NASA Earth Science Directorate Applied Science Program (2026-09-22)
Computed from the city coordinates with the NOAA solar position equations
IANA tz database
Wikidata, CC0 (2026-09-22)