Weather in Nikkō - 14-day forecast

Detailed weather forecast for Nikkō, Japan: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.

Forecast for the next days in Nikkō

today🌧️ 19°💧 27.4 mm

Sun🌧️ 18°💧 10.2 mm

Mon🌧️ 19°💧 139.6 mm

Tue🌧️ 22°💧 1.7 mm

Wed🌧️ 21°💧 31.5 mm

Thu🌧️ 16°💧 85.7 mm

Fri🌧️ 16°💧 20.8 mm

Sat🌧️ 20°💧 2.2 mm

Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Saturday 5 Sept in Nikkō, the forecast high is 19°C. Typical daytime temperatures at this time of year range from 22°C to 26°C, so it will be exceptionally cool. It is cooler than 96% of similar days.

Saturday 5 Sept

19°Cexceptionally cool

usually 22°C–26°C

cooler than 96% of similar days

night: near normal rain: exceptionally wet wind: lighter than usual

Sunday 6 Sept

18°Cexceptionally cool

usually 21°C–26°C

cooler than 96% of similar days

night: near normal rain: more rain than usual wind: typical

Monday 7 Sept

19°Cexceptionally cool

usually 21°C–26°C

cooler than 91% of similar days

night: exceptionally warm rain: exceptionally wet wind: exceptionally strong

Tuesday 8 Sept

22°Ccooler than usual

usually 21°C–26°C

cooler than 70% of similar days

night: exceptionally warm rain: typical rainfall wind: typical

Wednesday 9 Sept

21°Ccooler than usual

usually 21°C–26°C

cooler than 81% of similar days

night: warmer than usual rain: exceptionally wet wind: exceptionally light

Thursday 10 Sept

16°Cexceptionally cool

usually 21°C–25°C

cooler than 96% of similar days

night: near normal rain: exceptionally wet wind: exceptionally light

Friday 11 Sept

16°Cexceptionally cool

usually 21°C–25°C

cooler than 96% of similar days

night: warmer than usual rain: exceptionally wet wind: exceptionally light

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →

cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 23°C by day. The coolest year was 1981 (20°C) and the warmest was 2024 (27°C). The current forecast averages 19°C - lower than in 100% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - Nikkō

Nikkō - 14-day weather forecast infographic

Nikkō 30 & 45-day weather - long-range outlook

Next 16 days · forecast

20°

around 17° at night · days with rain: 14

Weeks 3-4 · avg for September

25°

around 22° at night · rain chance 61%

Weeks 5-7 · avg for October

20°

around 17° at night · rain chance 43%

The 30 & 45-day outlook for Nikkō: the next 16 days are a numerical forecast updated daily - on average 20° by day and 17° at night. Further out we rely on multi-year climate averages: around 25° in September, and about 20° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Nikkō

Saturday5 September 2026

🌧️19°heavy rain

sunrise 05:15 · sunset 18:05 · night 17° · evening 18° · rain 27.4 mm · humidity 89% · wind 2 m/s · clouds 100%

Sunday6 September 2026

🌧️18°moderate rain

sunrise 05:16 · sunset 18:04 · night 17° · evening 17° · rain 10.22 mm · humidity 84% · wind 3 m/s · clouds 100%

Monday7 September 2026

🌧️19°very heavy rain

sunrise 05:17 · sunset 18:02 · night 19° · evening 20° · rain 139.57 mm · humidity 95% · wind 5 m/s · clouds 100%

Tuesday8 September 2026

🌧️22°light rain

sunrise 05:17 · sunset 18:01 · night 19° · evening 19° · rain 1.74 mm · humidity 88% · wind 3 m/s · clouds 100%

Wednesday9 September 2026

🌧️21°moderate rain

sunrise 05:18 · sunset 17:59 · night 17° · evening 18° · rain 31.5 mm · humidity 100% · wind 2 m/s · clouds 100%

Thursday10 September 2026

🌧️16°heavy rain

sunrise 05:19 · sunset 17:58 · night 15° · evening 16° · rain 85.67 mm · humidity 98% · wind 1 m/s · clouds 100%

Friday11 September 2026

🌧️16°moderate rain

sunrise 05:20 · sunset 17:56 · night 16° · evening 16° · rain 20.76 mm · humidity 98% · wind 1 m/s · clouds 100%

Saturday12 September 2026

🌧️20°light rain

sunrise 05:21 · sunset 17:55 · night 18° · evening 18° · rain 2.16 mm · humidity 91% · wind 2 m/s · clouds 89%

Sunday13 September 2026

🌧️21°light rain

sunrise 05:21 · sunset 17:53 · night 17° · evening 19° · rain 0.51 mm · humidity 81% · wind 2 m/s · clouds 99%

Monday14 September 2026

🌧️24°light rain

sunrise 05:22 · sunset 17:52 · night 18° · evening 19° · rain 0.12 mm · humidity 69% · wind 3 m/s · clouds 69%

Tuesday15 September 2026

🌧️21°heavy rain

sunrise 05:23 · sunset 17:50 · night 19° · evening 20° · rain 25.95 mm · humidity 94% · wind 2 m/s · clouds 100%

Wednesday16 September 2026

🌧️18°moderate rain

sunrise 05:24 · sunset 17:49 · night 17° · evening 17° · rain 32.13 mm · humidity 99% · wind 1 m/s · clouds 100%

Thursday17 September 2026

🌧️21°moderate rain

sunrise 05:25 · sunset 17:47 · night 13° · evening 16° · rain 10.86 mm · humidity 70% · wind 3 m/s · clouds 6%

Friday18 September 2026

☀️23°clear sky

sunrise 05:25 · sunset 17:46 · night 15° · evening 16° · rain 17.37 mm · humidity 50% · wind 3 m/s · clouds 8%

Saturday19 September 2026

🌧️20°light rain

sunrise 05:26 · sunset 17:44 · night 16° · evening 17° · rain 2.76 mm · humidity 78% · wind 3 m/s · clouds 100%

Sunday20 September 2026

🌧️20°light rain

sunrise 05:27 · sunset 17:43 · night 16° · evening 16° · rain 7.11 mm · humidity 80% · wind 2 m/s · clouds 70%

UV index in Nikkō - is it safe to sunbathe?

Today the UV index in Nikkō is 5 (moderate) - unprotected fair skin can burn in about 45 minutes. Seek shade around midday. SPF 30+, sunglasses and a hat for longer stays.

Nikkō weather through the year

Warmest, driest months on average: April, May, June, September.

Upcoming public holidays in Japan: Respect for the Aged Day — 21 September · Citizen's Holiday — 22 September · Autumnal Equinox Day — 23 September. Full calendar and travel notes

Nearby and related places

TokyoOsakaNagoyaShizuokaKyotoTakayamaHiroshima

FAQ - Nikkō weather

What is the weather like in Nikkō today?

Today it is about 19° during the day and 17° at night, heavy rain.

How far ahead can I check the forecast for Nikkō?

This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.