Chikuma weather in April

In April, Chikuma sees average daytime highs of 13°C and overnight lows near 3°C, with 158 mm of precipitation across 15.5 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 10°C in the first days to 16°C by the end. The sky is clear or mostly clear about 30% 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 Chikuma's 2nd-clearest and 5th-windiest month. For the whole year in context, see Chikuma's year-round climate.

Daytime high
13°
7th warmest
Overnight low
6th coldest
Precipitation
158 mm
15.5 wet days
Daylight
12 h 54 min
5:20 AM – 6:16 PM
Cloud cover
60%
2nd clearest
Wind
6 km/h
5th windiest
Solar energy
5.39 kWh/m²
Travel score
3.1
out of 10

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 10°C in the first days to 16°C by the end.

A typical April day in Chikuma reaches about 13°C in the afternoon and slips back to 3°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 18°C. Set against its neighbours, April runs about 7°C warmer than March and about 6°C cooler than May.

10°20°151015202530
Avg high (°C)Avg low (°C)
190
290
3100
4100
5100
6101
7111
8111
9111
10111
11122
12122
13122
14122
15132
16133
17133
18133
19143
20143
21144
22144
23154
24154
25154
26155
27165
28165
29165
30166

How April really feels in Chikuma

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 12 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
12
wind chill below the day's low

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

Chikuma 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 / -7°15220.121.79.80.0
Feb / -6°12916.716.910.60.0
Mar / -3°18017.814.111.70.5
Apr13° / 15815.53.912.93.1
May19° / 19316.40.113.95.1
Jun22° / 14°28820.6014.44.7
Jul25° / 18°33823.2014.24.6
Aug27° / 18°22519.7013.45.1
Sep23° / 14°25619012.25.1
Oct17° / 22318.50.211.14.3
Nov10° / 14916.85.310.12.1
Dec / -4°15519.717.39.60.1

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 17% of April, with mostly cloudy or overcast conditions the remaining 53%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14852
24852
34951
44951
54951
64951
74951
84951
94951
105050
114951
124852
134852
144852
154753
164753
174654
184654
194654
204555
214456
224456
234456
244555
254456
264357
274357
284357
294357
304357

Chance of precipitation in April

Any precipitationSnow

Chikuma gets around 158 mm of rain and snow over 15.5 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 52% and peaks near 54% on the wettest days, and about 4 days bring snow.

0%20%40%60%151015202530
Rain chance (%)Snow chance (%)
15430
25428
35427
45426
55324
65323
75322
85221
95219
105218
115217
125216
135215
145214
155213
165212
175211
185210
19529
20528
21527
22516
23516
24515
25515
26504
27504
28493
29493
30483

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
231000
24991
25991
26991
27991
28991
29991
30991

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
66calm
76calm
86calm
96calm
106calm
116calm
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 5:42 AM to 5:02 AM, and sunset from 6:03 PM to 6:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:426:03
212.45:406:04
312.45:396:04
412.55:376:05
512.55:366:06
612.55:346:07
712.65:336:08
812.65:316:09
912.75:306:10
1012.75:286:11
1112.75:276:11
1212.85:266:12
1312.85:246:13
1412.95:236:14
1512.95:216:15
1612.95:206:16
1713.05:196:17
1813.05:176:18
1913.05:166:18
2013.15:146:19
2113.15:136:20
2213.25:126:21
2313.25:116:22
2413.25:096:23
2513.35:086:24
2613.35:076:25
2713.35:056:25
2813.45:046:26
2913.45:036:27
3013.45:026:28

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.39 kWh/m².

For context, solar energy here swings from a low near 2.27 kWh/m² to a high of 5.7 kWh/m² in May across the year — April's 5.39 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.4Bright
155.4Bright
165.4Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.6Bright
295.6Bright
305.6Bright
Planning a trip in April

Is April a good time to visit Chikuma?

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

3.1
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 Chikuma.

What to pack for Chikuma in April

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

In April, Chikuma sees daytime highs around 13°C and nights near 3°C. Pack rain gear. Worth having: a warm layer and sun protection. About 16 days see rain.

rain geara warm layersun protection

Sea temperature near Chikuma 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 67 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 20 to Nov 1 — about 4.4 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb11Bracing
Mar10Bracing
Apr11Bracing
May15Bracing
Jun20Cool
Jul23Refreshing
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec15Cool

UV index in Chikuma 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 Chikuma 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 Chikuma 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 Chikuma 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 Chikuma?

Chikuma sits at 36.5°N, 138.1°E, 388 m above sea level, in Japan. The nearest listed city is Sakaki, 11 km away.

Topography around Chikuma

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

Within 3 km, the terrain around Chikuma has large variations in elevation — a maximum elevation change of 635 m around an average of 539 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,102 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,130 m.

The land around Chikuma is covered by trees (54%) and artificial surfaces (22%) within 3 km, trees (78%) within 16 km, and trees (78%) within 80 km.

3 km
635 m
16 km
1,102 m
80 km
3,130 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Sakaki 11 km · Nagano 16 km · Ōmachi 20 km · Ueda 22 km · Suzaka 24 km · Hotaka 28 km · Kamimaruko 28 km · Toyoshina 30 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 Chikuma (36.5271°, 138.0894°, elevation 388 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. 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).