Saijō in Winter
In winter (December, January and February), Saijō sees average daytime highs around 9°C and overnight lows near 4°C, with 251 mm of precipitation over about 38 wet days across the season. It is the coldest season of the year and the driest season of the year.
Over the season highs ease from about 12°C in early December to 10°C by late February. The sky is clear or mostly clear about 23% of the time across winter, and the air most often feels dry.
Winter is Saijō's weakest season of the year to visit on our travel score. For the whole year in context, see Saijō's year-round climate.
- Avg daytime high
- 9°C
- coldest season of the year
- Avg overnight low
- 4°C
- Precipitation
- 251 mm
- 38 wet days
- Avg wind
- 12 km/h
- Travel score
- 1.6
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Saijō in Winter
Over the season highs ease from about 12°C in early December to 10°C by late February.
A typical winter day in Saijō reaches about 9°C and drops to 4°C overnight. The warmest of the three months is December, the coolest January.
How winter really feels in Saijō
Once humidity and wind are folded in, winter brings about 0 days that feel above 32°C and 34 that feel at or below 0°C.
The story in winter is cold — wind chill drags the overnight "feels like" below the raw low.
Saijō 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 | 8° / 3° | 78 | 13.5 | 3.4 | 10 | 1.1 |
| Feb | 9° / 3° | 84 | 12.1 | 3.2 | 10.7 | 1.5 |
| Mar | 12° / 6° | 122 | 13.4 | 1 | 11.7 | 2.9 |
| Apr | 17° / 10° | 134 | 11.6 | 0.1 | 12.8 | 5.1 |
| May | 21° / 15° | 158 | 11.2 | 0 | 13.7 | 6.3 |
| Jun | 24° / 19° | 249 | 15.1 | 0 | 14.2 | 5.7 |
| Jul | 28° / 23° | 228 | 15.6 | 0 | 14 | 5.1 |
| Aug | 29° / 24° | 151 | 13.8 | 0 | 13.3 | 5.0 |
| Sep | 26° / 21° | 216 | 14.1 | 0 | 12.2 | 6.0 |
| Oct | 21° / 16° | 166 | 11 | 0 | 11.1 | 6.4 |
| Nov | 15° / 10° | 90 | 9.9 | 0 | 10.2 | 4.8 |
| Dec | 10° / 5° | 90 | 12.8 | 1.6 | 9.8 | 2.3 |
Cloud cover in Winter
The sky is clear or mostly clear about 23% of the time across winter.
Chance of precipitation in Winter
Saijō gets around 251 mm of rain and snow over 38 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 12 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 9 h 54 min in early December to 11 h 12 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 2.8 kWh/m².
Hazard calendar for Saijō
In winter, Saijō overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Saijō sits in the Pacific typhoon belt; the season peaks July–October.
Is winter a good time to visit Saijō?
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 Saijō.
What to pack for Saijō in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Saijō sees daytime highs around 9°C and nights near 4°C. Pack a warm layer. Worth having: a heavy coat and rain gear. About 38 days see rain.
Sea temperature near Saijō 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 24 km away) is warmest in August at about 28°C and coldest in February near 13°C.
It's comfortable for a long swim from Jun 3 to Nov 14 — 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) | 15 | 13 | 13 | 15 | 18 | 22 | 25 | 28 | 27 | 24 | 20 | 17 |
| Comfort | Bracing | Bracing | Bracing | Cool | Cool | Refreshing | Warm | Warm | Warm | Refreshing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 15 | Bracing |
| Feb | 13 | Bracing |
| Mar | 13 | Bracing |
| Apr | 15 | Cool |
| May | 18 | Cool |
| Jun | 22 | Refreshing |
| Jul | 25 | Warm |
| Aug | 28 | Warm |
| Sep | 27 | Warm |
| Oct | 24 | Refreshing |
| Nov | 20 | Cool |
| Dec | 17 | Cool |
UV index in Saijō in Winter
Clear-sky midday UV across winter averages around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Saijō peaks around July 12 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (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 | 6 | 7 | 9 | 10 | 10 | 9 | 10 | 6 | 4 | 3 |
| Level | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 6 | High |
| Apr | 7 | Very high |
| May | 9 | Very high |
| Jun | 10 | Extreme |
| Jul | 10 | Extreme |
| Aug | 9 | Very high |
| Sep | 10 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Air quality in Saijō 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 Saijō is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (October, 11 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) | 13 | 16 | 20 | 22 | 19 | 16 | 13 | 12 | 11 | 11 | 12 | 11 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 16 | Moderate |
| Mar | 20 | Moderate |
| Apr | 22 | Moderate |
| May | 19 | Moderate |
| Jun | 16 | Moderate |
| Jul | 13 | Moderate |
| Aug | 12 | Moderate |
| Sep | 11 | Good |
| Oct | 11 | Good |
| Nov | 12 | Good |
| Dec | 11 | Good |
Where is Saijō?
Saijō sits at 33.9°N, 133.2°E, 8 m above sea level, in Japan. The nearest listed city is Niihama, 12 km away.
Topography around Saijō
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saijō.
Within 3 km, the terrain around Saijō has significant variations in elevation — a maximum elevation change of 275 m around an average of 16 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,886 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,900 m.
The land around Saijō is covered by artificial surfaces (46%) and cropland (25%) within 3 km, trees (50%) and water (31%) within 16 km, and trees (58%) and water (34%) 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 Saijō (33.9167°, 133.1833°, elevation 8 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.