Imarichō-kō weather in May

In May, Imarichō-kō sees average daytime highs of 24°C and overnight lows near 15°C, with 155 mm of rain across 10.3 wet days and about 13.7 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 22°C in the first days to 25°C by the end. The sky is clear or mostly clear about 29% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 18 min at the start of May to 14 hours by month's end. Set against the rest of the year, May is Imarichō-kō's 8th-clearest and 11th-windiest month. For the whole year in context, see Imarichō-kō's year-round climate.

Daytime high
24°
5th warmest
Overnight low
15°
7th coldest
Rainfall
155 mm
10.3 wet days
Daylight
13 h 42 min
5:25 AM – 7:08 PM
Cloud cover
64%
8th clearest
Wind
8 km/h
11th windiest
Solar energy
5.33 kWh/m²
Travel score
6.7
out of 10

Imarichō-kō is city in Saga Prefecture, Japan.

Density
227/km²
people per km²
Founded
1954

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 22°C in the first days to 25°C by the end.

A typical May day in Imarichō-kō reaches about 24°C in the afternoon and slips back to 15°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 27°C. Set against its neighbours, May runs about 4°C warmer than April and about 3°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12213
22214
32214
42214
52214
62214
72214
82314
92315
102315
112315
122315
132315
142315
152315
162415
172415
182416
192416
202416
212416
222416
232416
242416
252516
262517
272517
282517
292517
302517
312517

How May really feels in Imarichō-kō

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.

Imarichō-kō 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
Jan10° / 638.30.8102.1
Feb11° / 768.50.410.82.7
Mar14° / 12410.70.111.74.2
Apr19° / 11°14210.7012.86.0
May24° / 15°15510.3013.76.7
Jun26° / 20°32715.9014.25.4
Jul30° / 24°300170144.2
Aug31° / 25°18414.9013.23.9
Sep28° / 21°18912.7012.25.7
Oct23° / 16°1057.4011.27.3
Nov17° / 10°907.9010.35.8
Dec12° / 707.60.19.83.3

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 12% of May, with mostly cloudy or overcast conditions the remaining 59%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24357
34357
44357
54258
64258
74258
84060
94159
104159
114159
124159
134060
144060
154060
164159
174159
184060
194060
204060
214159
224159
234060
244060
253961
263961
274060
283961
293961
303763
313763

Chance of precipitation in May

Any precipitation

Imarichō-kō gets around 155 mm of rain over 10.3 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 34% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
134
234
334
435
535
635
735
835
935
1035
1134
1234
1334
1434
1534
1633
1733
1833
1933
2033
2132
2232
2332
2432
2532
2632
2732
2833
2933
3033
3134

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 36% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
157281230
255281340
354291340
453291440
551301450
651301450
749311550
848311550
947311660
1046321660
1145331660
1244331660
1342341760
1441351760
1539371860
1637381860
1736391961
1834402061
1932402161
2030412271
2129412371
2227412471
2325412571
2424412781
2522402881
2621393091
27193831101
28183733111
29163535121
30153436141
31143238151

Wind in May

Winds average 8 km/h in May.

Across May, daily wind ranges from about 7 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
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
307calm
317calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 18 min at the start of May to 14 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over May. Sunrise moves from 5:39 AM to 5:17 AM, and sunset from 6:57 PM to 7:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:396:57
213.35:386:58
313.45:376:58
413.45:366:59
513.45:357:00
613.45:347:01
713.55:337:01
813.55:327:02
913.55:317:03
1013.65:307:04
1113.65:297:04
1213.65:287:05
1313.65:287:06
1413.75:277:07
1513.75:267:07
1613.75:257:08
1713.75:257:09
1813.85:247:10
1913.85:237:10
2013.85:237:11
2113.85:227:12
2213.95:217:12
2313.95:217:13
2413.95:207:14
2513.95:207:15
2613.95:197:15
2713.95:197:16
2814.05:187:17
2914.05:187:17
3014.05:187:18
3114.05:177:18

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.33 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.15 kWh/m² to a high of 5.33 kWh/m² in May across the year — May's 5.33 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.3Bright
295.3Bright
305.3Bright
315.3Bright
Planning a trip in May

Hazard calendar for Imarichō-kō

In seasonPeak

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

Imarichō-kō sits in the Pacific typhoon belt; the season peaks July–October.

Imarichō-kō's rainy season runs May–September, 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 Imarichō-kō?

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

6.7
Sightseeing
2nd-best month of the year
5.4
Beach & pool
5th-best month of the year

May is a reasonable time to visit Imarichō-kō for sightseeing.

What to pack for Imarichō-kō in May

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

In May, Imarichō-kō sees daytime highs around 24°C and nights near 15°C. Worth packing: light clothes, rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

Sea temperature near Imarichō-kō 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 26 km away) is warmest in August at about 27°C and coldest in February near 15°C.

It's comfortable for a long swim from Jun 4 to Nov 24 — about 5.7 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Bracing
Mar15Bracing
Apr16Cool
May18Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Imarichō-kō 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 Imarichō-kō peaks around July 20 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 20UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr8Very high
May8Very high
Jun8Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Imarichō-kō 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 Imarichō-kō is worst in April — around 24 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateGoodModerateApr 1324 µg/m³Oct 1212 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar23Moderate
Apr24Moderate
May21Moderate
Jun17Moderate
Jul12Good
Aug12Moderate
Sep12Good
Oct11Good
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Imarichō-kō?

Imarichō-kō sits at 33.3°N, 129.9°E, 5 m above sea level, in Japan. The nearest listed city is Arita, 10 km away.

Topography around Imarichō-kō

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

Within 3 km, the terrain around Imarichō-kō has significant variations in elevation — a maximum elevation change of 433 m around an average of 51 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 778 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,455 m.

The land around Imarichō-kō is covered by trees (52%) and artificial surfaces (26%) within 3 km, trees (77%) within 16 km, and water (60%) and trees (28%) within 80 km.

3 km
433 m
16 km
778 m
80 km
1,455 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Arita 10 km · Takeo 16 km · Sasebo 18 km · Matsuura 19 km · Karatsu 21 km · Ureshinomachi-shimojuku 21 km · Taku 21 km · Higashigō 26 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 Imarichō-kō (33.2736°, 129.8788°, elevation 5 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).