Aki weather in May

In May, Aki sees average daytime highs of 21°C and overnight lows near 16°C, with 236 mm of rain across 12.7 wet days and about 13.7 hours of daylight. It is the 6th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 22°C by the end. The sky is clear or mostly clear about 24% 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 Aki's 10th-clearest and 9th-windiest month. For the whole year in context, see Aki's year-round climate.

Daytime high
21°
6th warmest
Overnight low
16°
7th coldest
Rainfall
236 mm
12.7 wet days
Daylight
13 h 42 min
5:09 AM – 6:53 PM
Cloud cover
68%
10th clearest
Wind
10 km/h
9th windiest
Solar energy
5.62 kWh/m²
Travel score
6.0
out of 10

Aki is city in Kōchi Prefecture, Japan.

Density
52/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 20°C in the first days to 22°C by the end.

A typical May day in Aki reaches about 21°C in the afternoon and slips back to 16°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 24°C. Set against its neighbours, May runs about 4°C warmer than April and about 3°C cooler than June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12014
22014
32014
42014
52014
62014
72015
82115
92115
102115
112115
122115
132115
142115
152115
162116
172116
182116
192216
202216
212216
222216
232216
242217
252217
262217
272217
282217
292217
302217
312217

How May really feels in Aki

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.

Aki weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan10° / 776.40.5102.3
Feb10° / 1017.80.910.82.5
Mar13° / 16711.20.111.73.8
Apr18° / 11°20311.6012.85.4
May21° / 16°23612.7013.76.0
Jun24° / 20°35819.1014.25.1
Jul27° / 23°35320.30144.7
Aug28° / 24°26119.6013.24.6
Sep26° / 21°30216.9012.25.5
Oct22° / 16°21711.3011.26.6
Nov17° / 11°1188.1010.35.8
Dec12° / 876.109.83.6

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% 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 64%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24357
34357
44258
54159
64060
73961
83961
93763
103862
113763
123664
133664
143664
153763
163664
173565
183565
193565
203565
213565
223565
233565
243466
253466
263367
273367
283169
293169
303070
312872

Chance of precipitation in May

Any precipitation

Aki gets around 236 mm of rain over 12.7 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 41% and peaks near 46% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
139
239
339
439
540
640
741
841
941
1042
1142
1242
1342
1441
1541
1640
1740
1839
1939
2039
2139
2239
2340
2440
2541
2641
2742
2842
2943
3045
3146

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 40% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
16124123
25925133
35825134
45626144
55427154
65228155
75228155
85029156
94930156
104831156
114731157
124632157
134533157
144434157
154335167
164236167
174036167
183937177
193837187
203738187
213538197
223439207
233239218
243139238
252939248
262739268
272539288
282338299
292138319
3019373310
3118363511

Wind in May

Winds average 10 km/h in May.

Across May, 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.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

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 5:22 AM to 5:01 AM, and sunset from 6:41 PM to 7:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:226:41
213.35:216:42
313.45:206:43
413.45:196:43
513.45:186:44
613.55:176:45
713.55:166:46
813.55:156:46
913.55:146:47
1013.65:146:48
1113.65:136:49
1213.65:126:49
1313.75:116:50
1413.75:106:51
1513.75:106:52
1613.75:096:53
1713.85:086:53
1813.85:076:54
1913.85:076:55
2013.85:066:55
2113.85:056:56
2213.95:056:57
2313.95:046:58
2413.95:046:58
2513.95:036:59
2613.95:037:00
2714.05:027:00
2814.05:027:01
2914.05:017:02
3014.05:017:02
3114.05:017:03

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.62 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.64 kWh/m² to a high of 5.62 kWh/m² in May across the year — May's 5.62 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.6Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.5Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in May

Hazard calendar for Aki

In seasonPeak

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

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

Aki'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 Aki?

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

6.0
Sightseeing
2nd-best month of the year
3.8
Beach & pool
6th-best month of the year

May is a reasonable time to visit Aki for sightseeing.

What to pack for Aki in May

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

In May, Aki sees daytime highs around 21°C and nights near 16°C. Worth packing: rain gear and sun protection. About 13 days see rain.

rain gearsun protection

Sea temperature near Aki in May

The nearest coast averages about 21°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 14 km away) is warmest in August at about 28°C and coldest in February near 17°C.

It's comfortable for a long swim from May 3 to Dec 19 — about 7.6 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan18Cool
Feb17Cool
Mar18Cool
Apr19Cool
May21Refreshing
Jun23Refreshing
Jul26Warm
Aug28Warm
Sep27Warm
Oct25Warm
Nov23Refreshing
Dec20Refreshing

UV index in Aki in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Aki peaks around June 23 at about 11 (extreme) — 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 highExtremeVery highModerateJun 23UV 11Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr8Very high
May9Very high
Jun11Extreme
Jul11Extreme
Aug9Very high
Sep10Very high
Oct7High
Nov4Moderate
Dec3Moderate

Air quality in Aki 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 Aki is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (September, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1320 µg/m³Sep 2010 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar19Moderate
Apr20Moderate
May18Moderate
Jun15Moderate
Jul11Good
Aug11Good
Sep10Good
Oct10Good
Nov11Good
Dec11Good
Location & terrain

Where is Aki?

Aki sits at 33.5°N, 133.9°E, 13 m above sea level, in Japan. The nearest listed city is Yamashita, 20 km away.

Topography around Aki

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

Within 3 km, the terrain around Aki has significant variations in elevation — a maximum elevation change of 426 m around an average of 37 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,031 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,939 m.

The land around Aki is covered by water (45%) and trees (23%) within 3 km, trees (53%) and water (42%) within 16 km, and trees (54%) and water (41%) within 80 km.

3 km
426 m
16 km
1,031 m
80 km
1,939 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Yamashita 20 km · Tosayamadachō-nakano 23 km · Nankoku 24 km · Muroto-misakicho 34 km · Kochi 34 km · Tosa 42 km · Ino 44 km · Susaki 58 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 Aki (33.5°, 133.9°, elevation 13 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).