Tōon in Summer
In summer (June, July and August), Tōon sees average daytime highs around 28°C and overnight lows near 21°C, with 770 mm of rain over about 53 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Over the season highs climb from about 24°C in early June to 29°C by late August. The sky is clear or mostly clear about 17% of the time across summer, and the air most often feels oppressive.
Summer is Tōon's 3rd-best season to visit on our travel score. For the whole year in context, see Tōon's year-round climate.
- Avg daytime high
- 28°C
- warmest season of the year
- Avg overnight low
- 21°C
- Rainfall
- 770 mm
- 53 wet days
- Avg wind
- 6 km/h
- Travel score
- 4.7
- 3rd-best season
- Months
- Jun · Jul · Aug
Temperature in Tōon in Summer
Over the season highs climb from about 24°C in early June to 29°C by late August.
A typical summer day in Tōon reaches about 28°C and drops to 21°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Tōon
Once humidity and wind are folded in, summer brings about 31 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Tōon weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 7° / -0° | 71 | 11.2 | 5.6 | 10 | 0.8 |
| Feb | 8° / 0° | 85 | 10.8 | 4.3 | 10.7 | 1.3 |
| Mar | 12° / 3° | 129 | 13.6 | 1.7 | 11.7 | 3.0 |
| Apr | 18° / 8° | 146 | 11.6 | 0.1 | 12.8 | 5.4 |
| May | 22° / 13° | 174 | 11.9 | 0 | 13.7 | 6.3 |
| Jun | 25° / 18° | 297 | 17.1 | 0 | 14.2 | 5.4 |
| Jul | 29° / 22° | 279 | 18.8 | 0 | 14 | 4.4 |
| Aug | 30° / 23° | 195 | 17.2 | 0 | 13.3 | 4.2 |
| Sep | 26° / 19° | 232 | 15 | 0 | 12.2 | 5.7 |
| Oct | 21° / 13° | 168 | 10.5 | 0 | 11.1 | 6.5 |
| Nov | 15° / 7° | 92 | 9.6 | 0 | 10.2 | 4.8 |
| Dec | 10° / 2° | 84 | 11.1 | 3 | 9.8 | 2.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 17% of the time across summer.
Chance of precipitation in Summer
Tōon gets around 770 mm of rain over 53 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 6 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 06 min in early June to 12 h 48 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.1 kWh/m².
Hazard calendar for Tōon
In summer, Tōon overlaps its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.
Tōon sits in the Pacific typhoon belt; the season peaks July–October.
Tōon's rainy season runs April–October, when most of the year's rain falls.
Is summer a good time to visit Tōon?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Tōon for sightseeing.
What to pack for Tōon in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Tōon sees daytime highs around 28°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 53 days see rain.
Sea temperature near Tōon in Summer
The nearest coast averages about 24°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 26 km away) is warmest in August at about 26°C and coldest in February near 13°C.
It's comfortable for a long swim from Jun 12 to Nov 17 — about 5.2 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 15 | 13 | 13 | 15 | 17 | 21 | 24 | 26 | 25 | 23 | 20 | 17 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Warm | Warm | Refreshing | Refreshing | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 15 | Bracing |
| Feb | 13 | Bracing |
| Mar | 13 | Bracing |
| Apr | 15 | Bracing |
| May | 17 | Cool |
| Jun | 21 | Refreshing |
| Jul | 24 | Warm |
| Aug | 26 | Warm |
| Sep | 25 | Warm |
| Oct | 23 | Refreshing |
| Nov | 20 | Refreshing |
| Dec | 17 | Cool |
UV index in Tōon in Summer
Clear-sky midday UV across summer averages around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Tōon peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 5 | 6 | 7 | 9 | 10 | 10 | 9 | 10 | 7 | 4 | 3 |
| Level | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 5 | Moderate |
| Mar | 6 | High |
| Apr | 7 | Very high |
| May | 9 | Very high |
| Jun | 10 | Extreme |
| Jul | 10 | Extreme |
| Aug | 9 | Very high |
| Sep | 10 | Very high |
| Oct | 7 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Air quality in Tōon in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Tōon is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 11 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 14 | 17 | 21 | 23 | 21 | 19 | 15 | 15 | 12 | 11 | 12 | 11 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 17 | Moderate |
| Mar | 21 | Moderate |
| Apr | 23 | Moderate |
| May | 21 | Moderate |
| Jun | 19 | Moderate |
| Jul | 15 | Moderate |
| Aug | 15 | Moderate |
| Sep | 12 | Moderate |
| Oct | 11 | Good |
| Nov | 12 | Good |
| Dec | 11 | Good |
Where is Tōon?
Tōon sits at 33.8°N, 132.9°E, 121 m above sea level, in Japan. The nearest listed city is Haramachi, 10 km away.
Topography around Tōon
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Tōon.
Within 3 km, the terrain around Tōon has significant variations in elevation — a maximum elevation change of 548 m around an average of 185 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,435 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,895 m.
The land around Tōon is covered by trees (48%), artificial surfaces (26%) and cropland (20%) within 3 km, trees (81%) within 16 km, and trees (53%) and water (40%) within 80 km.
Japan travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B
- 100 V · 50 / 60 Hz
- Prices
- ≈ 65% of US
- price level, 2025
- GDP per capita
- $35,951
- 2025
- Happiness
- 6.1 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.2
- per 100k, 2023
- Road deaths
- 3.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very low
- EF EPI 446
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Tōon (33.7943°, 132.8901°, elevation 121 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.