Numazu weather in January

In January, Numazu sees average daytime highs of 9°C and overnight lows near 5°C, with 96 mm of precipitation across 8.5 wet days and about 9.9 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 9°C through the month. The sky is clear or mostly clear about 56% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 42 min at the start of January to 10 h 12 min by month's end. Set against the rest of the year, January is Numazu's 2nd-clearest and 1st-windiest month. For the whole year in context, see Numazu's year-round climate.

Daytime high
12th warmest
Overnight low
2nd coldest
Precipitation
96 mm
8.5 wet days
Daylight
9 h 54 min
6:57 AM – 4:50 PM
Cloud cover
41%
2nd clearest
Wind
13 km/h
1st windiest
Solar energy
2.9 kWh/m²
Travel score
2.0
out of 10

Numazu is city in Shizuoka Prefecture, Japan.

Founded
1923

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 9°C through the month.

A typical January day in Numazu reaches about 9°C in the afternoon and slips back to 5°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 12°C. Set against its neighbours, January runs about 2°C cooler than December and on par with February.

10°15°151015202531
Avg high (°C)Avg low (°C)
1106
2106
3106
4106
5106
6106
7106
896
996
1096
1196
1295
1395
1495
1595
1695
1795
1895
1995
2095
2195
2295
2395
2495
2595
2695
2795
2895
2995
3095
3195

Numazu weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 968.50.79.92.0
Feb / 1179.10.910.72.1
Mar12° / 204140.511.72.9
Apr16° / 11°21513.1012.94.5
May19° / 15°23212.8013.85.7
Jun22° / 19°28615.8014.35.4
Jul26° / 23°29416.5014.15.6
Aug27° / 24°16514.2013.35.9
Sep25° / 22°24314.5012.26.0
Oct20° / 17°24513.1011.16.0
Nov16° / 12°14410.8010.25.0
Dec12° / 898.40.19.73.3

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 56% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 11% of January, with mostly cloudy or overcast conditions the remaining 33%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17426
27426
37327
47327
57327
67228
77228
87129
97030
106832
116733
126634
136634
146535
156436
166436
176337
186337
196238
206238
216238
226238
236337
246337
256436
266535
276436
286535
296535
306634
316634

Chance of precipitation in January

Any precipitationSnow

Numazu gets around 96 mm of rain and snow over 8.5 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 28% and peaks near 31% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1220
2221
3231
4231
5231
6241
7241
8251
9262
10272
11272
12282
13292
14293
15303
16303
17303
18303
19303
20313
21313
22313
23313
24304
25304
26304
27294
28294
29284
30284
31284

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in January

Winds average 13 km/h in January, the windiest month of the year.

Across January, daily wind ranges from about 13 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 h 42 min at the start of January to 10 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over January. Sunrise moves from 6:57 AM to 6:51 AM, and sunset from 4:38 PM to 5:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.76:574:38
29.76:584:39
39.76:584:39
49.76:584:40
59.76:584:41
69.76:584:42
79.76:584:42
89.76:584:43
99.86:584:44
109.86:584:45
119.86:584:46
129.86:584:47
139.86:584:47
149.86:584:48
159.96:584:49
169.96:574:50
179.96:574:51
189.96:574:52
199.96:574:53
2010.06:564:54
2110.06:564:55
2210.06:564:56
2310.06:554:57
2410.16:554:58
2510.16:544:59
2610.16:545:00
2710.16:535:01
2810.16:535:02
2910.26:525:03
3010.26:525:04
3110.26:515:05

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.9 kWh/m².

For context, solar energy here swings from a low near 2.52 kWh/m² to a high of 5.45 kWh/m² in May across the year — January's 2.9 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
12.8Moderate
22.8Moderate
32.8Moderate
42.8Moderate
52.8Moderate
62.8Moderate
72.8Moderate
82.8Moderate
92.8Moderate
102.8Moderate
112.8Moderate
122.8Moderate
132.8Moderate
142.8Moderate
152.8Moderate
162.8Moderate
172.8Moderate
182.8Moderate
192.8Moderate
202.9Moderate
212.9Moderate
222.9Moderate
232.9Moderate
243.0Moderate
253.0Moderate
263.0Moderate
273.1Moderate
283.1Moderate
293.1Moderate
303.2Moderate
313.2Moderate
Planning a trip in January

Hazard calendar for Numazu

In seasonPeak

In January, Numazu sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Numazu sits in the Pacific typhoon belt; the season peaks July–October.

Pacific typhoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is January a good time to visit Numazu?

Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

2.0
Sightseeing
12th-best month of the year
0.0
Beach & pool
11th-best month of the year

January is a weaker month for outdoor sightseeing in Numazu.

What to pack for Numazu in January

From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In January, Numazu sees daytime highs around 9°C and nights near 5°C. Pack a warm layer. Worth having: rain gear. About 9 days see rain.

a warm layerrain gear

Sea temperature near Numazu in January

The nearest coast averages about 16°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 22 km away) is warmest in August at about 27°C and coldest in February near 15°C.

It's comfortable for a long swim from May 30 to Nov 23 — about 5.9 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Cool
Mar15Cool
Apr17Cool
May19Cool
Jun22Refreshing
Jul24Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Numazu in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Numazu peaks around July 19 at about 10 (extreme) — 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJul 19UV 10Dec 23UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun10Very high
Jul10Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Numazu in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Numazu is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (December, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1623 µg/m³Dec 1610 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb20Moderate
Mar20Moderate
Apr23Moderate
May20Moderate
Jun17Moderate
Jul13Moderate
Aug12Good
Sep12Good
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Numazu?

Numazu sits at 35.1°N, 138.9°E, 8 m above sea level, in Japan. The nearest listed city is Fushimi, 3.0 km away.

Topography around Numazu

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Numazu.

Within 3 km, the terrain around Numazu has significant variations in elevation — a maximum elevation change of 251 m around an average of 18 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,439 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,736 m.

The land around Numazu is covered by artificial surfaces (67%) within 3 km, trees (54%) and water (24%) within 16 km, and trees (46%) and water (42%) within 80 km.

3 km
251 m
16 km
1,439 m
80 km
3,736 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Fushimi 3.0 km · Mishima 5.0 km · Nakatogari 5.0 km · Kamizawa 8.0 km · Susono 9.0 km · Izunokuni 10 km · Shuzenji 15 km · Izu 16 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
Shintoism 49%Buddhism 46%other 4%Christianity 1%

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 Numazu (35.1°, 138.8667°, 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).