Watari in Summer
In summer (June, July and August), Watari sees average daytime highs around 24°C and overnight lows near 19°C, with 508 mm of rain over about 48 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 25°C by late August. The sky is clear or mostly clear about 14% of the time across summer, and the air most often feels muggy.
Summer is Watari's best season of the year to visit on our travel score. For the whole year in context, see Watari's year-round climate.
- Avg daytime high
- 24°C
- warmest season of the year
- Avg overnight low
- 19°C
- Rainfall
- 508 mm
- 48 wet days
- Avg wind
- 7 km/h
- Travel score
- 5.5
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Watari in Summer
Over the season highs climb from about 20°C in early June to 25°C by late August.
A typical summer day in Watari reaches about 24°C and drops to 19°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Watari
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.
Watari 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 | 4° / -1° | 59 | 9.2 | 6.7 | 9.7 | 0.0 |
| Feb | 5° / -1° | 48 | 8.1 | 5.5 | 10.5 | 0.1 |
| Mar | 8° / 1° | 89 | 10.6 | 3.9 | 11.7 | 1.5 |
| Apr | 14° / 6° | 100 | 10.6 | 0.8 | 13 | 3.8 |
| May | 18° / 11° | 110 | 11.7 | 0 | 14 | 5.6 |
| Jun | 21° / 16° | 138 | 13.9 | 0 | 14.6 | 5.6 |
| Jul | 25° / 20° | 196 | 18.1 | 0 | 14.4 | 5.3 |
| Aug | 26° / 21° | 174 | 16.4 | 0 | 13.5 | 5.5 |
| Sep | 23° / 18° | 181 | 14.3 | 0 | 12.3 | 5.8 |
| Oct | 18° / 12° | 157 | 11 | 0 | 11 | 5.7 |
| Nov | 13° / 6° | 66 | 8.4 | 0.4 | 9.9 | 3.6 |
| Dec | 7° / 1° | 52 | 9.5 | 4 | 9.4 | 0.9 |
Cloud cover in Summer
The sky is clear or mostly clear about 14% of the time across summer.
Chance of precipitation in Summer
Watari gets around 508 mm of rain over 48 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 7 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 24 min in early June to 12 h 54 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 4.4 kWh/m².
Hazard calendar for Watari
In summer, Watari overlaps its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.
Watari sits in the Pacific typhoon belt; the season peaks July–October.
Watari's rainy season runs March–October, when most of the year's rain falls.
Is summer a good time to visit Watari?
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 Watari for sightseeing.
What to pack for Watari in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Watari sees daytime highs around 24°C and nights near 19°C. Pack rain gear. Worth having: light clothes and sun protection. About 48 days see rain.
Sea temperature near Watari in Summer
The nearest coast averages about 21°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 24°C and coldest in March near 9°C.
It's comfortable for a long swim from Jul 7 to Oct 10 — about 3.2 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 | 21 | 24 | 23 | 19 | 17 | 14 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Refreshing | Cool | 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 | 21 | Refreshing |
| Aug | 24 | Refreshing |
| Sep | 23 | Refreshing |
| Oct | 19 | Cool |
| Nov | 17 | Cool |
| Dec | 14 | Bracing |
UV index in Watari in Summer
Clear-sky midday UV across summer averages around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Watari peaks around August 13 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 4 | 6 | 8 | 8 | 9 | 9 | 8 | 5 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | Very high | High | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 8 | Very high |
| Jul | 9 | Very high |
| Aug | 9 | Very high |
| Sep | 8 | Very high |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Watari 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 Watari is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× 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) | 11 | 14 | 20 | 21 | 20 | 14 | 12 | 10 | 10 | 11 | 11 | 9 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 14 | Moderate |
| Mar | 20 | Moderate |
| Apr | 21 | Moderate |
| May | 20 | Moderate |
| Jun | 14 | Moderate |
| Jul | 12 | Good |
| Aug | 10 | Good |
| Sep | 10 | Good |
| Oct | 11 | Good |
| Nov | 11 | Good |
| Dec | 9 | Good |
Where is Watari?
Watari sits at 38.0°N, 140.9°E, 10 m above sea level, in Japan. The nearest listed city is Iwanuma, 8.0 km away.
Topography around Watari
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Watari.
Within 3 km, the terrain around Watari has only modest variations in elevation — a maximum elevation change of 212 m around an average of 39 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 331 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,031 m.
The land around Watari is covered by trees (42%) and cropland (33%) within 3 km, trees (35%), water (27%) and cropland (22%) within 16 km, and trees (56%) and water (27%) 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 Watari (38.035°, 140.8511°, elevation 10 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.