Niimi weather in May

In May, Niimi sees average daytime highs of 22°C and overnight lows near 12°C, with 138 mm of rain across 11.1 wet days and about 13.8 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 23°C by the end. The sky is clear or mostly clear about 26% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 24 min at the start of May to 14 h 12 min by month's end. Set against the rest of the year, May is Niimi's 5th-clearest and 6th-windiest month. For the whole year in context, see Niimi's year-round climate.

Daytime high
22°
5th warmest
Overnight low
12°
8th coldest
Rainfall
138 mm
11.1 wet days
Daylight
13 h 48 min
5:07 AM – 6:57 PM
Cloud cover
65%
5th clearest
Wind
9 km/h
6th windiest
Solar energy
5.57 kWh/m²
Travel score
6.4
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 May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 20°C in the first days to 23°C by the end.

A typical May day in Niimi reaches about 22°C in the afternoon and slips back to 12°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 26°C. Set against its neighbours, May runs about 5°C warmer than April and about 3°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12010
22010
32010
42010
52110
62110
72111
82111
92111
102111
112111
122111
132111
142212
152212
162212
172212
182212
192212
202212
212212
222213
232313
242313
252313
262313
272313
282313
292314
302314
312314

How May really feels in Niimi

Once humidity and wind are folded in, May 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

May 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 May compares with the rest of the year at a glance. May is the 5th-warmest and 5th-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 May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 13% of May, with mostly cloudy or overcast conditions the remaining 60%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24555
34555
44456
54357
64357
74258
84159
94060
104060
113961
123961
134060
143961
153961
163961
173862
183862
194060
203961
213961
223862
233862
243862
253862
263862
273763
283763
293763
303565
313565

Chance of precipitation in May

Any precipitation

Niimi gets around 138 mm of rain over 11.1 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 35% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
133
233
334
434
534
634
735
835
936
1036
1136
1236
1336
1436
1536
1636
1736
1835
1935
2035
2135
2235
2335
2435
2535
2635
2735
2835
2935
3036
3136

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 74% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1851230
2841240
3841240
4821341
5811351
6801451
7801451
8801451
9791461
10781561
11781561
12781561
13781561
14781561
15771661
16771661
17771661
18761761
19751861
20741961
21722071
22712171
23702271
24682381
25662581
26652681
27622891
286029101
295731111
305532121
315234131

Wind in May

Winds average 9 km/h in May.

Across May, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 24 min at the start of May to 14 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 48 minutes over May. Sunrise moves from 5:22 AM to 4:59 AM, and sunset from 6:45 PM to 7:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:226:45
213.45:216:46
313.55:196:47
413.55:186:48
513.55:176:48
613.55:166:49
713.65:156:50
813.65:146:51
913.65:136:52
1013.75:136:52
1113.75:126:53
1213.75:116:54
1313.75:106:55
1413.85:096:56
1513.85:086:56
1613.85:076:57
1713.95:076:58
1813.95:066:59
1913.95:057:00
2013.95:057:00
2114.05:047:01
2214.05:037:02
2314.05:037:03
2414.05:027:03
2514.05:027:04
2614.15:017:05
2714.15:017:06
2814.15:007:06
2914.15:007:07
3014.14:597:08
3114.24:597:08

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.57 kWh/m² — the sunniest month for solar.

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 — May's 5.57 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.6Bright
295.6Bright
305.5Bright
315.5Bright
Planning a trip in May

Hazard calendar for Niimi

In seasonPeak

In May, 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 May a good time to visit Niimi?

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

6.4
Sightseeing
2nd-best month of the year
4.3
Beach & pool
5th-best month of the year

May is a reasonable time to visit Niimi for sightseeing.

What to pack for Niimi in May

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

In May, Niimi sees daytime highs around 22°C and nights near 12°C. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

Sea temperature near Niimi in May

The nearest coast averages about 18°C in May — 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 May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 (very high — sun protection essential). 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 May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May 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
May 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).