Seto in Winter
In winter (December, January and February), Seto sees average daytime highs around 11°C and overnight lows near 1°C, with 169 mm of precipitation over about 18 wet days across the season. It is the coldest season of the year and the driest season of the year.
Across winter, daytime highs hold fairly steady around 11°C. The sky is clear or mostly clear about 48% of the time across winter, and the air most often feels dry.
Winter is Seto's weakest season of the year to visit on our travel score. For the whole year in context, see Seto's year-round climate.
- Avg daytime high
- 11°C
- coldest season of the year
- Avg overnight low
- 1°C
- Precipitation
- 169 mm
- 18 wet days
- Avg wind
- 9 km/h
- Travel score
- 2.8
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Seto in Winter
Across winter, daytime highs hold fairly steady around 11°C.
A typical winter day in Seto reaches about 11°C and drops to 1°C overnight. The warmest of the three months is December, the coolest January.
How winter really feels in Seto
Once humidity and wind are folded in, winter brings about 0 days that feel above 32°C and 77 that feel at or below 0°C.
The story in winter is cold — wind chill drags the overnight "feels like" below the raw low.
Seto weather by month
How the three winter months (December, January and February) 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 | 9° / 0° | 54 | 5.7 | 0.3 | 9.9 | 2.2 |
| Feb | 11° / 1° | 60 | 6.5 | 0.6 | 10.7 | 2.7 |
| Mar | 14° / 3° | 110 | 10.1 | 0 | 11.7 | 4.3 |
| Apr | 19° / 9° | 123 | 10.6 | 0 | 12.9 | 6.1 |
| May | 24° / 14° | 144 | 10.6 | 0 | 13.8 | 6.7 |
| Jun | 27° / 19° | 178 | 14.3 | 0 | 14.3 | 5.5 |
| Jul | 31° / 23° | 190 | 15 | 0 | 14.1 | 4.0 |
| Aug | 32° / 24° | 112 | 11.8 | 0 | 13.3 | 3.7 |
| Sep | 29° / 20° | 186 | 12.1 | 0 | 12.2 | 5.3 |
| Oct | 23° / 14° | 171 | 10.3 | 0 | 11.1 | 6.8 |
| Nov | 17° / 7° | 85 | 7.2 | 0 | 10.1 | 5.9 |
| Dec | 12° / 2° | 55 | 6 | 0.1 | 9.7 | 3.5 |
Cloud cover in Winter
The sky is clear or mostly clear about 48% of the time across winter.
Chance of precipitation in Winter
Seto gets around 169 mm of rain and snow over 18 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 9 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 9 h 48 min in early December to 11 h 06 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 3.0 kWh/m².
Hazard calendar for Seto
In winter, Seto overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Seto sits in the Pacific typhoon belt; the season peaks July–October.
Is winter a good time to visit Seto?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a weaker month for outdoor sightseeing in Seto.
What to pack for Seto in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Seto sees daytime highs around 11°C and nights near 1°C. Pack a warm layer. About 18 days see rain.
Sea temperature near Seto in Winter
The nearest coast averages about 15°C across winter — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 45 km away) is warmest in August at about 27°C and coldest in February near 13°C.
It's comfortable for a long swim from May 31 to Nov 9 — about 5.4 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 14 | 13 | 14 | 15 | 18 | 22 | 25 | 27 | 26 | 22 | 19 | 17 |
| Comfort | Bracing | Bracing | Bracing | Cool | Cool | Refreshing | Warm | Warm | Warm | Refreshing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 14 | Bracing |
| Feb | 13 | Bracing |
| Mar | 14 | Bracing |
| Apr | 15 | Cool |
| May | 18 | Cool |
| Jun | 22 | Refreshing |
| Jul | 25 | Warm |
| Aug | 27 | Warm |
| Sep | 26 | Warm |
| Oct | 22 | Refreshing |
| Nov | 19 | Cool |
| Dec | 17 | Cool |
UV index in Seto in Winter
Clear-sky midday UV across winter averages around 3. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Seto peaks around July 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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) | 3 | 4 | 5 | 7 | 8 | 10 | 10 | 8 | 9 | 6 | 4 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 10 | Very high |
| Jul | 10 | Very high |
| Aug | 8 | Very high |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 2 | Moderate |
Air quality in Seto in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter falls, not just the annual average.
Air quality in Seto is worst in April — around 22 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (December, 13 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 | 22 | 21 | 19 | 15 | 14 | 14 | 15 | 15 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 17 | Moderate |
| Mar | 21 | Moderate |
| Apr | 22 | Moderate |
| May | 21 | Moderate |
| Jun | 19 | Moderate |
| Jul | 15 | Moderate |
| Aug | 14 | Moderate |
| Sep | 14 | Moderate |
| Oct | 15 | Moderate |
| Nov | 15 | Moderate |
| Dec | 13 | Moderate |
Where is Seto?
Seto sits at 35.2°N, 137.1°E, 111 m above sea level, in Japan. The nearest listed city is Owariasahi, 7.0 km away.
Topography around Seto
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Seto.
Within 3 km, the terrain around Seto has only modest variations in elevation — a maximum elevation change of 181 m around an average of 140 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 714 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,926 m.
The land around Seto is covered by artificial surfaces (47%) and trees (44%) within 3 km, trees (55%) and artificial surfaces (35%) within 16 km, and trees (64%) 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 Seto (35.2333°, 137.1°, elevation 111 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.