Tomakomai weather in April

In April, Tomakomai sees average daytime highs of 7°C and overnight lows near 2°C, with 78 mm of precipitation across 11.5 wet days and about 13.1 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 5°C in the first days to 10°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 24 min at the start of April to 13 h 48 min by month's end. Set against the rest of the year, April is Tomakomai's 3rd-clearest and 7th-windiest month. For the whole year in context, see Tomakomai's year-round climate.

Daytime high
7th warmest
Overnight low
5th coldest
Precipitation
78 mm
11.5 wet days
Daylight
13 h 12 min
4:59 AM – 6:09 PM
Cloud cover
59%
3rd clearest
Wind
12 km/h
7th windiest
Solar energy
5.18 kWh/m²
Travel score
1.1
out of 10

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 5°C in the first days to 10°C by the end.

A typical April day in Tomakomai reaches about 7°C in the afternoon and slips back to 2°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 4°C and 11°C. Set against its neighbours, April runs about 5°C warmer than March and about 5°C cooler than May.

-5°10°15°151015202530
Avg high (°C)Avg low (°C)
15-1
25-1
35-1
450
560
660
760
860
960
1061
1171
1271
1371
1471
1571
1682
1782
1882
1982
2082
2183
2293
2393
2493
2593
2693
27104
28104
29104
30104

How April really feels in Tomakomai

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 23 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
23
wind chill below the day's low

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

Tomakomai weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-2° / -7°447.18.89.20.0
Feb-1° / -7°437.3910.30.0
Mar / -4°6310.39.311.60.0
Apr / 7811.53.213.11.1
May13° / 10911.80.114.43.2
Jun16° / 12°10011.3015.14.8
Jul20° / 16°13813.7014.85.6
Aug22° / 18°19714.5013.75.8
Sep20° / 15°17715012.35.4
Oct14° / 11011.80.210.84.0
Nov / 7810.839.60.9
Dec / -4°638.78.68.90.0

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 19% of April, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15149
25248
35149
45149
55050
65149
75149
85050
94951
105050
115050
125050
134852
144951
154951
164951
174852
184951
194951
204852
214951
224852
234852
244852
254753
264654
274654
284555
294555
304555

Chance of precipitation in April

Any precipitationSnow

Tomakomai gets around 78 mm of rain and snow over 11.5 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 38% and peaks near 40% on the wettest days, and about 3 days bring snow.

0%10%20%30%40%50%151015202530
Rain chance (%)Snow chance (%)
13621
23620
33619
43718
53717
63716
73815
83815
93714
103713
113712
123712
133812
143811
153811
163810
173810
183910
19399
20399
21398
22398
23397
24396
25396
26395
27394
28394
29393
30403

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 12 km/h in April.

Across April, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2911calm
3011calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 84 minutes over April. Sunrise moves from 5:25 AM to 4:37 AM, and sunset from 5:51 PM to 6:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:255:51
212.55:235:52
312.55:225:54
412.65:205:55
512.65:185:56
612.75:165:57
712.75:155:58
812.85:135:59
912.85:116:00
1012.95:096:02
1112.95:086:03
1213.05:066:04
1313.05:046:05
1413.15:026:06
1513.15:016:07
1613.24:596:09
1713.24:576:10
1813.34:566:11
1913.34:546:12
2013.34:526:13
2113.44:516:14
2213.44:496:16
2313.54:486:17
2413.54:466:18
2513.64:456:19
2613.64:436:20
2713.74:426:21
2813.74:406:22
2913.84:396:24
3013.84:376:25

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.18 kWh/m².

For context, solar energy here swings from a low near 1.67 kWh/m² to a high of 5.41 kWh/m² in May across the year — April's 5.18 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.9Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.1Bright
135.1Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in April

Hazard calendar for Tomakomai

In seasonPeak

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

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

Tomakomai's rainy season runs May–October, when most of the year's rain falls.

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

Is April a good time to visit Tomakomai?

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

1.1
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 Tomakomai.

What to pack for Tomakomai in April

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

In April, Tomakomai sees daytime highs around 7°C and nights near 2°C. Pack a warm layer. Worth having: a heavy coat, rain gear and sun protection. About 12 days see rain.

a warm layera heavy coatrain gearsun protection

Sea temperature near Tomakomai in April

The nearest coast averages about 5°C in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 20°C and coldest in March near 3°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°C)Comfort
Jan6Bracing
Feb4Bracing
Mar3Bracing
Apr5Bracing
May8Bracing
Jun13Bracing
Jul17Cool
Aug20Refreshing
Sep20Cool
Oct16Cool
Nov13Bracing
Dec10Bracing

UV index in Tomakomai in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tomakomai peaks around August 18 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 19 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighHighVery highHighModerateLowAug 18UV 8Dec 19UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr6High
May7Very high
Jun6High
Jul5Moderate
Aug8Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Tomakomai 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 Tomakomai is worst in April — around 19 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1119 µg/m³Dec 158 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb14Moderate
Mar19Moderate
Apr19Moderate
May18Moderate
Jun13Moderate
Jul12Good
Aug10Good
Sep9Good
Oct11Good
Nov9Good
Dec8Good
Location & terrain

Where is Tomakomai?

Tomakomai sits at 42.6°N, 141.6°E, 7 m above sea level, in Japan. The nearest listed city is Chitose, 21 km away.

Topography around Tomakomai

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

Within 3 km, the terrain around Tomakomai has only modest variations in elevation — a maximum elevation change of 58 m around an average of 9 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 439 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,859 m.

The land around Tomakomai is covered by artificial surfaces (47%) and water (31%) within 3 km, water (42%) and trees (41%) within 16 km, and trees (51%) and water (33%) within 80 km.

3 km
58 m
16 km
439 m
80 km
1,859 m
treesgrasslandcroplandartificial surfaceswaterwetland
April weather nearby: Chitose 21 km · Shiraoi 23 km · Eniwa 29 km · Kitahiroshima 38 km · Noboribetsu 40 km · Sapporo 52 km · Ebetsu 53 km · Muroran 62 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 Tomakomai (42.6369°, 141.6033°, elevation 7 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).