Ōmachi weather in April

In April, Ōmachi sees average daytime highs of 7°C and overnight lows near -1°C, with 200 mm of precipitation across 16.6 wet days and about 12.9 hours of daylight. It is the 7th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 4°C in the first days to 10°C by the end. The sky is clear or mostly clear about 26% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 18 min at the start of April to 13 h 24 min by month's end. Set against the rest of the year, April is Ōmachi's 1st-clearest and 5th-windiest month. For the whole year in context, see Ōmachi's year-round climate.

Daytime high
7th warmest
Overnight low
-1°
6th coldest
Precipitation
200 mm
16.6 wet days
Daylight
12 h 54 min
5:21 AM – 6:17 PM
Cloud cover
63%
1st clearest
Wind
6 km/h
5th windiest
Solar energy
5.66 kWh/m²
Travel score
0.9
out of 10

Ōmachi is dissolved municipality in Kitaazumi district, Nagano prefecture, Japan.

Founded
1889

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 4°C in the first days to 10°C by the end.

A typical April day in Ōmachi reaches about 7°C in the afternoon and slips back to -1°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 2°C and 12°C. Set against its neighbours, April runs about 6°C warmer than March and about 7°C cooler than May.

-10°10°20°151015202530
Avg high (°C)Avg low (°C)
14-4
24-4
34-3
44-3
55-3
65-3
75-3
85-2
96-2
106-2
116-2
126-2
136-1
147-1
157-1
167-1
177-1
1880
1980
2080
2180
2290
2391
2491
2591
26101
27101
28102
29112
30112

How April really feels in Ōmachi

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 29 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
29
wind chill below the day's low

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

Ōmachi weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-5° / -11°19322.4249.80.0
Feb-3° / -10°16718.319.610.60.0
Mar / -6°2111919.111.70.0
Apr / -1°20016.69.912.90.9
May14° / 23717.81.313.93.5
Jun18° / 11°34420.6014.44.1
Jul22° / 15°45124.4014.24.3
Aug23° / 16°29721.9013.44.9
Sep19° / 12°29219.1012.24.6
Oct13° / 22716.31.111.13.2
Nov / -2°18317.311.110.10.6
Dec-2° / -8°19621.421.49.60.0

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% 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 60%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23664
33763
43862
53862
63862
73862
83961
94060
104159
114159
124159
134159
144159
154060
164060
174159
184060
194060
204159
214159
224060
234060
244159
254159
264159
274159
284159
294258
304258

Chance of precipitation in April

Any precipitationSnow

Ōmachi gets around 200 mm of rain and snow over 16.6 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 56% and peaks near 59% on the wettest days, and about 10 days bring snow.

0%20%40%60%151015202530
Rain chance (%)Snow chance (%)
15951
25950
35949
45947
55846
65845
75844
85742
95741
105739
115738
125637
135636
145635
155633
165632
175531
185530
195529
205528
215527
225426
235424
245423
255422
265421
275320
285319
295317
305316

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 (%)
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

Wind in April

Winds average 6 km/h in April.

Across April, daily wind ranges from about 6 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
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 18 min at the start of April to 13 h 24 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 5:43 AM to 5:03 AM, and sunset from 6:04 PM to 6:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:436:04
212.45:416:04
312.45:406:05
412.55:386:06
512.55:376:07
612.55:356:08
712.65:346:09
812.65:326:10
912.75:316:11
1012.75:296:11
1112.75:286:12
1212.85:276:13
1312.85:256:14
1412.95:246:15
1512.95:226:16
1612.95:216:17
1713.05:196:18
1813.05:186:18
1913.05:176:19
2013.15:156:20
2113.15:146:21
2213.25:136:22
2313.25:116:23
2413.25:106:24
2513.35:096:25
2613.35:086:25
2713.35:066:26
2813.45:056:27
2913.45:046:28
3013.45:036:29

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.66 kWh/m².

For context, solar energy here swings from a low near 2.39 kWh/m² to a high of 5.74 kWh/m² in May across the year — April's 5.66 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.4Bright
45.4Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.7Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.7Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
Planning a trip in April

Hazard calendar for Ōmachi

In seasonPeak

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

Ōmachi 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 Ōmachi?

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

0.9
Sightseeing
7th-best month of the year
0.0
Beach & pool
7th-best month of the year

April is a weaker month for outdoor sightseeing in Ōmachi.

What to pack for Ōmachi in April

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

In April, Ōmachi sees daytime highs around 7°C and nights near -1°C. Pack a warm layer and rain gear. Worth having: a heavy coat and sun protection. About 17 days see rain.

a warm layerrain geara heavy coatsun protection

Sea temperature near Ōmachi 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 61 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 18 to Nov 3 — about 4.6 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb11Bracing
Mar10Bracing
Apr11Bracing
May15Cool
Jun20Cool
Jul24Refreshing
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Ōmachi 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 Ōmachi peaks around July 20 at about 10 (extreme) — 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 highExtremeVery highModerateJul 20UV 10Dec 21UV 2
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Very high
Jul10Extreme
Aug10Extreme
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Ōmachi 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 Ōmachi is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1721 µg/m³Dec 1510 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar20Moderate
Apr21Moderate
May20Moderate
Jun18Moderate
Jul15Moderate
Aug13Moderate
Sep12Good
Oct11Good
Nov11Good
Dec10Good
Location & terrain

Where is Ōmachi?

Ōmachi sits at 36.5°N, 137.9°E, 714 m above sea level, in Japan. The nearest listed city is Hotaka, 18 km away.

Topography around Ōmachi

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

Within 3 km, the terrain around Ōmachi has significant variations in elevation — a maximum elevation change of 486 m around an average of 823 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,371 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,120 m.

The land around Ōmachi is covered by trees (50%) and artificial surfaces (26%) within 3 km, trees (83%) within 16 km, and trees (75%) within 80 km.

3 km
486 m
16 km
2,371 m
80 km
3,120 m
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Hotaka 18 km · Chikuma 20 km · Toyoshina 22 km · Azumino 24 km · Sakaki 29 km · Matsumoto 31 km · Nagano 33 km · Ueda 39 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 Ōmachi (36.5°, 137.8667°, elevation 714 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).