How warm is it in Tokyo in September?

Daytime highs averaged 28.1 °C, night-time lows 21.6 °C. The highest value of the past 10 years was 35.4 °C (10 Sep 2019), the lowest 14.4 °C (29 Sep 2017).

How often does it rain in Tokyo in September?

On average there were 18.7 rain days (at least 1 mm) with 297 mm of precipitation in total.

How warm is the sea in Tokyo in September?

The sea temperature averaged 25.6 °C (open-sea point approx. 10 km from the town).

Holiday Weather Rewind

Destinations Method & data

Loading weather data…

We are fetching the daily values for every year. The first time, this takes a few seconds.

Tokyo weather in September: temperature & rain

Photo: David Kernan · CC BY 4.0

🇯🇵 Weather in Tokyo in September

This is what the weather in Tokyo (Japan) was like in September over the years 2017–2026.

Key facts at a glance

Prevailing weather: Rain

Avg. daytime high

28.1 °C

26.3 °C – 30.1 °C

Avg. night-time low

21.6 °C

19.6 °C – 23.7 °C

Avg. rain days in period

18.7

62 % of days · ≥ 1.0 mm

Avg. precipitation in period

297 mm

186 mm – 914 mm

Avg. cloud cover

74 %

This data source has no sunshine hours – average cloud cover is shown instead.

Avg. sea temperature

25.6 °C

Sea measuring point approx. 10 km from the location

Extremes: Highest temperature 35.4 °C (10 Sep 2019) · Lowest temperature 14.4 °C (29 Sep 2017) · Avg. daily peak wind 20 km/h

Weather mix of all days

15Sunny
53Partly cloudy
43Cloudy
70Light rain
117Rain

Summary

On average 28.1 °C during the day and 21.6 °C at night.
On average 18.7 rain days (Rain day = at least 1.0 mm of precipitation) with 297 mm of precipitation in total.
The sea averaged 25.6 °C.
Prevailing weather: Rain.
Warmest year: 2023 (avg. 30.1 °C), coolest: 2021 (avg. 26.3 °C).
Wettest year: 2026 (914 mm), driest: 2020 (186 mm).
Extremes: 35.4 °C on 10 Sep 2019 and 14.4 °C on 29 Sep 2017.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max26.6°Avg. min21.2°
Rain days
28 Rain days
Precipitation
914 mm
Avg. cloud cover
–
Sea temperature
25.2 °C
Max 31.0 °C · Min 18.1 °C
2025
Avg. max30.0°Avg. min22.9°
Rain days
17 Rain days
Precipitation
230 mm
Avg. cloud cover
66 % cloudy
Sea temperature
26.5 °C
Max 34.6 °C · Min 17.5 °C
2024
Avg. max29.6°Avg. min23.6°
Rain days
19 Rain days
Precipitation
232 mm
Avg. cloud cover
64 % cloudy
Sea temperature
27.6 °C
Max 33.7 °C · Min 18.3 °C
2023
Avg. max30.1°Avg. min23.7°
Rain days
16 Rain days
Precipitation
257 mm
Avg. cloud cover
66 % cloudy
Sea temperature
26.7 °C
Max 33.2 °C · Min 18.9 °C
2022
Avg. max28.2°Avg. min20.9°
Rain days
18 Rain days
Precipitation
237 mm
Avg. cloud cover
73 % cloudy
Sea temperature
25.0 °C
Max 31.1 °C · Min 16.4 °C
2021
Avg. max26.3°Avg. min19.6°
Rain days
17 Rain days
Precipitation
190 mm
Avg. cloud cover
77 % cloudy
Sea temperature
24.2 °C
Max 30.0 °C · Min 16.8 °C
2020
Avg. max27.7°Avg. min22.2°
Rain days
24 Rain days
Precipitation
186 mm
Avg. cloud cover
81 % cloudy
Sea temperature
26.1 °C
Max 32.6 °C · Min 14.7 °C
2019
Avg. max28.8°Avg. min21.5°
Rain days
12 Rain days
Precipitation
191 mm
Avg. cloud cover
73 % cloudy
Sea temperature
25.5 °C
Max 35.4 °C · Min 17.6 °C
2018
Avg. max27.0°Avg. min20.7°
Rain days
23 Rain days
Precipitation
330 mm
Avg. cloud cover
87 % cloudy
Sea temperature
24.9 °C
Max 31.2 °C · Min 15.0 °C
2017
Avg. max27.2°Avg. min19.7°
Rain days
13 Rain days
Precipitation
198 mm
Avg. cloud cover
78 % cloudy
Sea temperature
24.0 °C
Max 31.2 °C · Min 14.4 °C

Frequently asked questions

How warm is it in Tokyo in September?: Daytime highs averaged 28.1 °C, night-time lows 21.6 °C. The highest value of the past 10 years was 35.4 °C (10 Sep 2019), the lowest 14.4 °C (29 Sep 2017).
How often does it rain in Tokyo in September?: On average there were 18.7 rain days (at least 1 mm) with 297 mm of precipitation in total.
How warm is the sea in Tokyo in September?: The sea temperature averaged 25.6 °C (open-sea point approx. 10 km from the town).

Check your exact travel dates

Choose your travel period – we show the weather for exactly those days.

Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. Snow depth is the model value for the grid cell, not the depth on the slopes. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis); Sea measuring point approx. 10 km from the location (35.600, 139.810)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)