How warm is it in Tokyo in May?

Daytime highs averaged 23.2 °C, night-time lows 14.8 °C. The highest value of the past 10 years was 31.1 °C (26 May 2019), the lowest 7.3 °C (10 May 2024).

How often does it rain in Tokyo in May?

On average there were 13.4 rain days (at least 1 mm) with 179 mm of precipitation in total.

How warm is the sea in Tokyo in May?

The sea temperature averaged 18.5 °C (open-sea point approx. 10 km from the town).

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Tokyo weather in May: temperature & rain

Photo: David Kernan · CC BY 4.0

🇯🇵 Weather in Tokyo in May

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

Key facts at a glance

Prevailing weather: Cloudy

Avg. daytime high

23.2 °C

22.2 °C – 24.2 °C

Avg. night-time low

14.8 °C

14.2 °C – 15.2 °C

Avg. rain days in period

13.4

43 % of days · ≥ 1.0 mm

Avg. precipitation in period

179 mm

89.8 mm – 280 mm

Avg. cloud cover

72 %

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

Avg. sea temperature

18.5 °C

Sea measuring point approx. 10 km from the location

Extremes: Highest temperature 31.1 °C (26 May 2019) · Lowest temperature 7.3 °C (10 May 2024) · Avg. daily peak wind 23 km/h

Weather mix of all days

33Sunny
62Partly cloudy
81Cloudy
58Light rain
76Rain

Summary

On average 23.2 °C during the day and 14.8 °C at night.
On average 13.4 rain days (Rain day = at least 1.0 mm of precipitation) with 179 mm of precipitation in total.
The sea averaged 18.5 °C.
Prevailing weather: Cloudy.
Warmest year: 2026 (avg. 24.2 °C), coolest: 2025 (avg. 22.2 °C).
Wettest year: 2025 (280 mm), driest: 2017 (89.8 mm).
Extremes: 31.1 °C on 26 May 2019 and 7.3 °C on 10 May 2024.

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. max24.2°Avg. min15.0°
Rain days
11 Rain days
Precipitation
155 mm
Avg. cloud cover
62 % cloudy
Sea temperature
19.3 °C
Max 29.1 °C · Min 10.3 °C
2025
Avg. max22.2°Avg. min15.2°
Rain days
16 Rain days
Precipitation
280 mm
Avg. cloud cover
84 % cloudy
Sea temperature
18.0 °C
Max 26.9 °C · Min 11.4 °C
2024
Avg. max23.3°Avg. min15.1°
Rain days
15 Rain days
Precipitation
241 mm
Avg. cloud cover
70 % cloudy
Sea temperature
18.6 °C
Max 27.9 °C · Min 7.3 °C
2023
Avg. max22.6°Avg. min14.4°
Rain days
15 Rain days
Precipitation
236 mm
Avg. cloud cover
68 % cloudy
Sea temperature
18.3 °C
Max 29.5 °C · Min 9.4 °C
2022
Avg. max22.2°Avg. min14.2°
Rain days
15 Rain days
Precipitation
197 mm
Avg. cloud cover
74 % cloudy
Sea temperature
18.1 °C
Max 28.3 °C · Min 8.8 °C
2021
Avg. max23.4°Avg. min15.2°
Rain days
15 Rain days
Precipitation
139 mm
Avg. cloud cover
81 % cloudy
Sea temperature
18.2 °C
Max 27.1 °C · Min 8.7 °C
2020
Avg. max23.3°Avg. min15.1°
Rain days
17 Rain days
Precipitation
137 mm
Avg. cloud cover
73 % cloudy
Sea temperature
19.0 °C
Max 27.7 °C · Min 8.8 °C
2019
Avg. max23.8°Avg. min14.3°
Rain days
10 Rain days
Precipitation
153 mm
Avg. cloud cover
67 % cloudy
Sea temperature
18.7 °C
Max 31.1 °C · Min 7.8 °C
2018
Avg. max23.3°Avg. min14.7°
Rain days
13 Rain days
Precipitation
165 mm
Avg. cloud cover
72 % cloudy
Sea temperature
19.3 °C
Max 26.9 °C · Min 8.0 °C
2017
Avg. max23.7°Avg. min14.6°
Rain days
7 Rain days
Precipitation
89.8 mm
Avg. cloud cover
66 % cloudy
Sea temperature
17.2 °C
Max 29.2 °C · Min 8.2 °C

Frequently asked questions

How warm is it in Tokyo in May?: Daytime highs averaged 23.2 °C, night-time lows 14.8 °C. The highest value of the past 10 years was 31.1 °C (26 May 2019), the lowest 7.3 °C (10 May 2024).
How often does it rain in Tokyo in May?: On average there were 13.4 rain days (at least 1 mm) with 179 mm of precipitation in total.
How warm is the sea in Tokyo in May?: The sea temperature averaged 18.5 °C (open-sea point approx. 10 km from the town).

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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)