Nikko in Summer
In summer (June, July and August), Nikko sees average daytime highs around 23°C and overnight lows near 17°C, with 791 mm of rain over about 73 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 19°C in early June to 24°C by late August. The sky is clear or mostly clear about 9% of the time across summer, and the air most often feels muggy.
Summer is Nikko's best season of the year to visit on our travel score. For the whole year in context, see Nikko's year-round climate.
- Avg daytime high
- 23°C
- warmest season of the year
- Avg overnight low
- 17°C
- Rainfall
- 791 mm
- 73 wet days
- Avg wind
- 5 km/h
- Travel score
- 4.4
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Nikko in Summer
Over the season highs climb from about 19°C in early June to 24°C by late August.
A typical summer day in Nikko reaches about 23°C and drops to 17°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Nikko
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.
Nikko 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 | 1° / -6° | 62 | 9.6 | 11.6 | 9.8 | 0.0 |
| Feb | 2° / -5° | 58 | 9.5 | 9.6 | 10.6 | 0.0 |
| Mar | 6° / -2° | 112 | 14 | 9.6 | 11.7 | 0.5 |
| Apr | 12° / 3° | 137 | 15.1 | 2.8 | 12.9 | 2.8 |
| May | 17° / 9° | 176 | 17.1 | 0.1 | 13.9 | 4.5 |
| Jun | 20° / 14° | 228 | 22.2 | 0 | 14.5 | 4.3 |
| Jul | 24° / 18° | 305 | 25.4 | 0 | 14.3 | 4.3 |
| Aug | 25° / 19° | 259 | 25 | 0 | 13.4 | 4.5 |
| Sep | 21° / 15° | 269 | 20.1 | 0 | 12.2 | 4.7 |
| Oct | 16° / 9° | 198 | 16.6 | 0.1 | 11.1 | 4.1 |
| Nov | 10° / 2° | 84 | 9.4 | 1.1 | 10 | 2.3 |
| Dec | 4° / -3° | 59 | 10.1 | 7.8 | 9.5 | 0.1 |
Cloud cover in Summer
The sky is clear or mostly clear about 9% of the time across summer.
Chance of precipitation in Summer
Nikko gets around 791 mm of rain over 73 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 5 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 18 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 4.6 kWh/m².
Hazard calendar for Nikko
In summer, Nikko overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Nikko's rainy season runs May–October, when most of the year's rain falls.
Is summer a good time to visit Nikko?
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 Nikko for sightseeing.
What to pack for Nikko in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Nikko sees daytime highs around 23°C and nights near 17°C. Pack rain gear. Worth having: light clothes and sun protection. About 73 days see rain.
UV index in Nikko in Summer
Clear-sky midday UV across summer averages around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Nikko peaks around July 18 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 5 | 7 | 9 | 9 | 10 | 9 | 9 | 6 | 3 | 2 |
| Level | Moderate | Moderate | High | High | Very high | Very high | Very high | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | High |
| Apr | 7 | High |
| May | 9 | Very high |
| Jun | 9 | Very high |
| Jul | 10 | Very high |
| Aug | 9 | Very high |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Moderate |
Air quality in Nikko 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 Nikko 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 | 13 | 19 | 21 | 20 | 16 | 14 | 13 | 11 | 11 | 10 | 9 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 13 | Moderate |
| Mar | 19 | Moderate |
| Apr | 21 | Moderate |
| May | 20 | Moderate |
| Jun | 16 | Moderate |
| Jul | 14 | Moderate |
| Aug | 13 | Moderate |
| Sep | 11 | Good |
| Oct | 11 | Good |
| Nov | 10 | Good |
| Dec | 9 | Good |
Where is Nikko?
Nikko sits at 36.8°N, 139.6°E, 555 m above sea level, in Japan. The nearest listed city is Imaichi, 7.0 km away.
Topography around Nikko
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Nikko.
Within 3 km, the terrain around Nikko has large variations in elevation — a maximum elevation change of 635 m around an average of 673 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,272 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,551 m.
The land around Nikko is covered by trees (88%) within 3 km, trees (87%) within 16 km, and trees (72%) 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 Nikko (36.75°, 139.6167°, elevation 555 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.