Niimi weather in April

In April, Niimi sees average daytime highs of 17°C and overnight lows near 7°C, with 117 mm of precipitation across 10.8 wet days and about 12.9 hours of daylight. It is the 7th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 15°C in the first days to 19°C by the end. The sky is clear or mostly clear about 29% 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 Niimi's 4th-clearest and 4th-windiest month. For the whole year in context, see Niimi's year-round climate.

Daytime high
17°
7th warmest
Overnight low
6th coldest
Precipitation
117 mm
10.8 wet days
Daylight
12 h 54 min
5:40 AM – 6:33 PM
Cloud cover
62%
4th clearest
Wind
9 km/h
4th windiest
Solar energy
5.19 kWh/m²
Travel score
5.3
out of 10

Niimi is city in Okayama Prefecture, Japan.

Density
39/km²
people per km²
Founded
2005

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 15°C in the first days to 19°C by the end.

A typical April day in Niimi reaches about 17°C in the afternoon and slips back to 7°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 22°C. Set against its neighbours, April runs about 6°C warmer than March and about 5°C cooler than May.

10°20°151015202530
Avg high (°C)Avg low (°C)
1144
2144
3154
4155
5155
6155
7165
8165
9165
10166
11166
12176
13176
14176
15177
16177
17177
18187
19187
20188
21188
22188
23198
24198
25198
26199
27199
28199
29209
30209

How April really feels in Niimi

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

April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Niimi weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°549.76.59.90.5
Feb / -1°619.76.210.70.9
Mar11° / 10812.43.111.72.7
Apr17° / 11710.80.312.95.3
May22° / 12°13811.1013.86.4
Jun25° / 17°19414.2014.35.8
Jul29° / 21°23616.9014.14.6
Aug30° / 22°14914.4013.34.5
Sep26° / 18°20113.1012.26.1
Oct20° / 11°1098.1011.16.6
Nov14° / 678.10.210.24.4
Dec / 598.83.69.71.6

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 16% of April, with mostly cloudy or overcast conditions the remaining 56%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14258
24357
34456
44456
54555
64555
74555
84555
94555
104456
114456
124456
134555
144555
154555
164456
174456
184456
194456
204456
214555
224555
234555
244456
254555
264555
274555
284555
294555
304555

Chance of precipitation in April

Any precipitationSnow

Niimi gets around 117 mm of rain and snow over 10.8 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 36% and peaks near 38% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%50%151015202530
Rain chance (%)Snow chance (%)
1384
2384
3374
4373
5373
6363
7363
8362
9362
10362
11362
12361
13361
14371
15371
16371
17371
18371
19371
20370
21360
22360
23360
24350
25350
26350
27340
28340
29340
30330

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 95% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
19910
29910
39910
49910
59910
69820
79820
89820
99820
109820
119820
129820
139730
149730
159730
169631
179541
189541
199541
209451
219451
229451
239361
249271
259172
269082
278992
2888102
2987103
3086113

Wind in April

Winds average 9 km/h in April.

Across April, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

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 6:01 AM to 5:23 AM, and sunset from 6:21 PM to 6:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:016:21
212.45:596:21
312.45:586:22
412.45:576:23
512.55:556:24
612.55:546:25
712.65:526:25
812.65:516:26
912.65:506:27
1012.75:486:28
1112.75:476:29
1212.75:456:29
1312.85:446:30
1412.85:436:31
1512.85:416:32
1612.95:406:33
1712.95:396:34
1813.05:376:34
1913.05:366:35
2013.05:356:36
2113.15:336:37
2213.15:326:38
2313.15:316:38
2413.25:306:39
2513.25:296:40
2613.25:276:41
2713.35:266:42
2813.35:256:43
2913.35:246:43
3013.45:236:44

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.19 kWh/m².

For context, solar energy here swings from a low near 2.2 kWh/m² to a high of 5.57 kWh/m² in May across the year — April's 5.19 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.9Bright
54.9Bright
64.9Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.1Bright
125.1Bright
135.1Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in April

Hazard calendar for Niimi

In seasonPeak

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

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

Niimi's rainy season runs March–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 Niimi?

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

5.3
Sightseeing
5th-best month of the year
1.4
Beach & pool
7th-best month of the year

April is a reasonable time to visit Niimi for sightseeing.

What to pack for Niimi in April

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

In April, Niimi sees daytime highs around 17°C and nights near 7°C. Worth packing: a warm layer, rain gear and sun protection. About 11 days see rain.

a warm layerrain gearsun protection

Sea temperature near Niimi in April

The nearest coast averages about 15°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 68 km away) is warmest in August at about 27°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 3 to Nov 12 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep27Warm
Oct23Refreshing
Nov20Cool
Dec16Cool

UV index in Niimi 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 Niimi peaks around July 15 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJul 15UV 10Dec 23UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Niimi 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 Niimi is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 1322 µg/m³Oct 1511 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar22Moderate
Apr23Moderate
May20Moderate
Jun18Moderate
Jul14Moderate
Aug13Moderate
Sep12Moderate
Oct11Good
Nov13Moderate
Dec12Moderate
Location & terrain

Where is Niimi?

Niimi sits at 35.0°N, 133.5°E, 193 m above sea level, in Japan. The nearest listed city is Takahashi, 26 km away.

Topography around Niimi

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

Within 3 km, the terrain around Niimi has significant variations in elevation — a maximum elevation change of 489 m around an average of 336 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,045 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,692 m.

The land around Niimi is covered by trees (83%) within 3 km, trees (94%) within 16 km, and trees (73%) within 80 km.

3 km
489 m
16 km
1,045 m
80 km
1,692 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Takahashi 26 km · Maniwa 27 km · Ibara 43 km · Sōja 43 km · Shōbara 44 km · Kannabechō-yahiro 47 km · Tsuyama 49 km · Fuchūchō 50 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 Niimi (34.9833°, 133.4667°, elevation 193 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).