Tennō in Summer
In summer (June, July and August), Tennō sees average daytime highs around 25°C and overnight lows near 20°C, with 496 mm of rain over about 41 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 20°C in early June to 27°C by late August. The sky is clear or mostly clear about 22% of the time across summer, and the air most often feels muggy.
Summer is Tennō's best season of the year to visit on our travel score. For the whole year in context, see Tennō's year-round climate.
- Avg daytime high
- 25°C
- warmest season of the year
- Avg overnight low
- 20°C
- Rainfall
- 496 mm
- 41 wet days
- Avg wind
- 11 km/h
- Travel score
- 5.9
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Tennō in Summer
Over the season highs climb from about 20°C in early June to 27°C by late August.
A typical summer day in Tennō reaches about 25°C and drops to 20°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Tennō
Once humidity and wind are folded in, summer brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Tennō 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 | 3° / -1° | 96 | 19.1 | 18.5 | 9.5 | 0.0 |
| Feb | 4° / -1° | 81 | 16.2 | 14.2 | 10.4 | 0.0 |
| Mar | 7° / 2° | 97 | 15.9 | 7.6 | 11.7 | 0.8 |
| Apr | 13° / 6° | 97 | 13.2 | 0.5 | 13 | 3.2 |
| May | 18° / 12° | 112 | 12.6 | 0 | 14.2 | 5.3 |
| Jun | 22° / 17° | 113 | 11.3 | 0 | 14.8 | 6.2 |
| Jul | 26° / 21° | 191 | 14.8 | 0 | 14.5 | 5.8 |
| Aug | 27° / 23° | 193 | 14.9 | 0 | 13.6 | 5.7 |
| Sep | 24° / 19° | 168 | 13.9 | 0 | 12.3 | 6.0 |
| Oct | 18° / 12° | 151 | 14.3 | 0 | 10.9 | 5.2 |
| Nov | 12° / 7° | 142 | 17.9 | 1.6 | 9.8 | 2.5 |
| Dec | 6° / 2° | 135 | 21.4 | 11.2 | 9.2 | 0.4 |
Cloud cover in Summer
The sky is clear or mostly clear about 22% of the time across summer.
Chance of precipitation in Summer
Tennō gets around 496 mm of rain over 41 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 11 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 36 min in early June to 13 hours 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 Tennō
In summer, Tennō overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Tennō sits in the Pacific typhoon belt; the season peaks July–October.
Is summer a good time to visit Tennō?
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 Tennō for sightseeing.
What to pack for Tennō in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Tennō sees daytime highs around 25°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 41 days see rain.
Sea temperature near Tennō in Summer
The nearest coast averages about 22°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 25°C and coldest in March near 9°C.
It's comfortable for a long swim from Jun 30 to Oct 23 — about 3.8 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 11 | 9 | 9 | 10 | 14 | 18 | 22 | 25 | 24 | 21 | 17 | 14 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Warm | Refreshing | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 11 | Bracing |
| Feb | 9 | Bracing |
| Mar | 9 | Bracing |
| Apr | 10 | Bracing |
| May | 14 | Bracing |
| Jun | 18 | Cool |
| Jul | 22 | Refreshing |
| Aug | 25 | Warm |
| Sep | 24 | Warm |
| Oct | 21 | Refreshing |
| Nov | 17 | Cool |
| Dec | 14 | Bracing |
UV index in Tennō in Summer
Clear-sky midday UV across summer averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Tennō peaks around August 19 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 3 | 6 | 8 | 7 | 5 | 9 | 7 | 4 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Moderate | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Moderate |
| Mar | 3 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 7 | Very high |
| Jul | 5 | Moderate |
| Aug | 9 | Very high |
| Sep | 7 | High |
| Oct | 4 | Moderate |
| Nov | 2 | Moderate |
| Dec | 1 | Low |
Air quality in Tennō 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 Tennō is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 9 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) | 10 | 14 | 19 | 21 | 20 | 15 | 13 | 11 | 10 | 10 | 10 | 9 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 14 | Moderate |
| Mar | 19 | Moderate |
| Apr | 21 | Moderate |
| May | 20 | Moderate |
| Jun | 15 | Moderate |
| Jul | 13 | Moderate |
| Aug | 11 | Good |
| Sep | 10 | Good |
| Oct | 10 | Good |
| Nov | 10 | Good |
| Dec | 9 | Good |
Where is Tennō?
Tennō sits at 39.9°N, 140.0°E, 6 m above sea level, in Japan. The nearest listed city is Katagami, 4.0 km away.
Topography around Tennō
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Tennō.
Within 3 km, the terrain around Tennō has only modest variations in elevation — a maximum elevation change of 27 m around an average of 2 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 419 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,630 m.
The land around Tennō is covered by cropland (38%) and water (34%) within 3 km, water (38%), trees (29%) and cropland (26%) within 16 km, and trees (51%) and water (39%) 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 Tennō (39.9°, 139.9667°, elevation 6 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.