Weather in Tokyo in September

Daylight on the 15th: 12 h 25 min
Average high: 28 °C (82 °F)
Average low: 21 °C (69 °F)
Precipitation: 223 mm

In September, the area around Tokyo averages daytime highs of 28 °C (82 °F) and night-time lows of 21 °C (69 °F). Days are warm enough for light clothing.

Temperature

Compared with August, September is cooler by 4 °C in daytime highs, and October is cooler by 6 °C than September. The daily average is 24 °C (75 °F).

Precipitation, humidity and wind

Precipitation averages about 223 mm over the month, with 17 days of at least 1 mm. That is a wet month: pack a rain jacket.

Relative humidity averages 82 % and wind at 2 m about 2.4 m/s.

Daylight

On 15 September the sun rises at 05:24 and sets at 17:49 local time, for 12 h 25 min of daylight, 66 minutes less than a month earlier.

About these numbers

The figures are 2011-2020 averages for the grid cell around Tokyo 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	9 °C	1 °C	65 mm
February	10 °C	1 °C	75 mm
March	14 °C	4 °C	120 mm
April	18 °C	9 °C	137 mm
May	23 °C	14 °C	141 mm
June	26 °C	18 °C	198 mm
July	30 °C	23 °C	158 mm
August	31 °C	24 °C	111 mm
September	28 °C	21 °C	223 mm
October	22 °C	15 °C	233 mm
November	17 °C	9 °C	110 mm
December	12 °C	3 °C	68 mm

Questions

How warm is Tokyo in September?

Average highs of 28 °C (82 °F) and lows of 21 °C (69 °F) (2011-2020 averages).

Does it rain a lot in Tokyo in September?

About 223 mm over the month, on 17 days with at least 1 mm.

Travel data for Japan

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)