Shiozawa weather in April

In April, Shiozawa sees average daytime highs of 12°C and overnight lows near 2°C, with 139 mm of precipitation across 16.6 wet days and about 12.9 hours of daylight. It is the 7th-warmest and 12th-wettest month of the year here.

Highs climb over the month, from about 9°C in the first days to 16°C by the end. The sky is clear or mostly clear about 25% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 24 min at the start of April to 13 h 30 min by month's end. Set against the rest of the year, April is Shiozawa's 1st-clearest and 1st-windiest month. For the whole year in context, see Shiozawa's year-round climate.

Daytime high
12°
7th warmest
Overnight low
6th coldest
Precipitation
139 mm
16.6 wet days
Daylight
12 h 54 min
5:16 AM – 6:13 PM
Cloud cover
65%
1st clearest
Wind
7 km/h
1st windiest
Solar energy
5.33 kWh/m²
Travel score
2.7
out of 10

Shiozawa is dissolved municipality in Minamiuonuma district, Niigata prefecture, Japan.

Density
106/km²
people per km²
Founded
1900

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

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 9°C in the first days to 16°C by the end.

A typical April day in Shiozawa reaches about 12°C in the afternoon and slips back to 2°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 18°C. Set against its neighbours, April runs about 7°C warmer than March and about 7°C cooler than May.

10°20°151015202530
Avg high (°C)Avg low (°C)
18-1
290
390
490
590
6100
7101
8101
9101
10111
11111
12112
13112
14122
15122
16122
17123
18133
19133
20133
21143
22144
23144
24144
25154
26155
27155
28165
29165
30166

How April really feels in Shiozawa

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 14 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
14
wind chill below the day's low

The story in April is cold — wind chill drags the overnight "feels like" below the raw low.

Shiozawa weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -6°22925.425.39.70.0
Feb / -5°17721.320.310.60.0
Mar / -3°17621.217.311.70.3
Apr12° / 13916.6512.92.7
May19° / 16115.90.3145.1
Jun22° / 14°20118.4014.55.0
Jul26° / 18°29222.5014.34.7
Aug27° / 19°21720.2013.45.0
Sep23° / 15°21618.2012.35.2
Oct17° / 20117.50.3114.3
Nov10° / 16818.76.4101.9
Dec / -4°21023.319.49.50.1

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in April, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 62%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23664
33664
43763
53763
63862
73961
83961
93961
104060
114060
124060
134060
144060
154060
163961
173961
183961
193961
203961
213961
223961
233961
243862
253862
263862
273763
283763
293862
303862

Chance of precipitation in April

Any precipitationSnow

Shiozawa gets around 139 mm of rain and snow over 16.6 wet days in April, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 55% and peaks near 62% on the wettest days, and about 5 days bring snow. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)Snow chance (%)
16237
26235
36234
46132
56130
66029
76027
85925
95824
105722
115621
125619
135518
145517
155416
165315
175314
185313
195212
205211
215210
22529
23529
24528
25528
26527
27517
28516
29515
30505

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April 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%151015202530
Dry (%)Comfortable (%)
11000
21000
31000
41000
51000
61000
71000
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
23991
24991
25991
26991
27991
28991
29991
30991

Wind in April

Winds average 7 km/h in April, the windiest month of the year.

Across April, daily wind ranges from about 7 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over April. Sunrise moves from 5:39 AM to 4:58 AM, and sunset from 6:00 PM to 6:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:396:00
212.45:376:01
312.45:366:02
412.55:346:03
512.55:336:03
612.65:316:04
712.65:306:05
812.65:286:06
912.75:276:07
1012.75:256:08
1112.85:246:09
1212.85:226:10
1312.85:216:11
1412.95:196:11
1512.95:186:12
1612.95:166:13
1713.05:156:14
1813.05:146:15
1913.15:126:16
2013.15:116:17
2113.15:096:18
2213.25:086:19
2313.25:076:20
2413.35:056:20
2513.35:046:21
2613.35:036:22
2713.45:026:23
2813.45:006:24
2913.44:596:25
3013.54:586:26

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.33 kWh/m².

For context, solar energy here swings from a low near 2.08 kWh/m² to a high of 5.62 kWh/m² in May across the year — April's 5.33 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.1Bright
45.1Bright
55.1Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in April

Hazard calendar for Shiozawa

In seasonPeak

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

Shiozawa 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 April a good time to visit Shiozawa?

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

2.7
Sightseeing
7th-best month of the year
0.1
Beach & pool
7th-best month of the year

April is a weaker month for outdoor sightseeing in Shiozawa.

What to pack for Shiozawa in April

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

In April, Shiozawa sees daytime highs around 12°C and nights near 2°C. Pack rain gear. Worth having: a warm layer and sun protection. About 17 days see rain.

rain geara warm layersun protection

Sea temperature near Shiozawa in April

The nearest coast averages about 11°C in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 42 km away) is warmest in August at about 27°C and coldest in March near 10°C.

It's comfortable for a long swim from Jun 21 to Oct 31 — about 4.4 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb11Bracing
Mar10Bracing
Apr11Bracing
May15Bracing
Jun20Cool
Jul23Refreshing
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov18Cool
Dec15Cool

UV index in Shiozawa in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Shiozawa peaks around August 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 highModerateAug 12UV 10Dec 21UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Moderate

Air quality in Shiozawa in April

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Shiozawa is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1821 µg/m³Dec 1610 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun18Moderate
Jul15Moderate
Aug13Moderate
Sep12Good
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Shiozawa?

Shiozawa sits at 37.0°N, 138.8°E, 180 m above sea level, in Japan. The nearest listed city is Muikamachi, 4.0 km away.

Topography around Shiozawa

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

Within 3 km, the terrain around Shiozawa has significant variations in elevation — a maximum elevation change of 364 m around an average of 231 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,859 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,551 m.

The land around Shiozawa is covered by cropland (52%) and trees (25%) within 3 km, trees (77%) within 16 km, and trees (75%) within 80 km.

3 km
364 m
16 km
1,859 m
80 km
2,551 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Muikamachi 4.0 km · Minamiuonuma 5.0 km · Tōkamachi 13 km · Uonuma 25 km · Ojiya 29 km · Minakami 41 km · Kashiwazaki 45 km · Nagaoka 46 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 Shiozawa (37.0376°, 138.8487°, elevation 180 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).