Ojiya weather in May

In May, Ojiya sees average daytime highs of 22°C and overnight lows near 11°C, with 127 mm of rain across 13.9 wet days and about 14 hours of daylight. It is the 5th-warmest and 11th-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 24°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 30 min at the start of May to 14 h 24 min by month's end. Set against the rest of the year, May is Ojiya's 3rd-clearest and 7th-windiest month. For the whole year in context, see Ojiya's year-round climate.

Daytime high
22°
5th warmest
Overnight low
11°
8th coldest
Rainfall
127 mm
13.9 wet days
Daylight
14 hours
4:41 AM – 6:41 PM
Cloud cover
65%
3rd clearest
Wind
7 km/h
7th windiest
Solar energy
5.67 kWh/m²
Travel score
6.0
out of 10

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 24°C by the end.

A typical May day in Ojiya reaches about 22°C in the afternoon and slips back to 11°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 27°C. Set against its neighbours, May runs about 6°C warmer than April and about 3°C cooler than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
1209
2209
3209
4209
5209
62110
72110
82110
92110
102110
112110
122111
132111
142211
152211
162211
172211
182212
192212
202212
212312
222312
232312
242313
252313
262313
272313
282413
292413
302414
312414

How May really feels in Ojiya

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.

Ojiya weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°22725.621.99.70.0
Feb / -2°16821.417.810.60.1
Mar / -0°16220.611.711.71.3
Apr16° / 12215.51.712.94.3
May22° / 11°12713.90146.0
Jun25° / 16°15115.3014.55.7
Jul29° / 21°24319.1014.34.4
Aug30° / 21°17116.7013.44.2
Sep26° / 17°17715.8012.35.5
Oct20° / 11°17415.90115.3
Nov13° / 16618.22.3103.0
Dec / -0°21823.614.29.50.6

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 61%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24159
34159
44060
54159
64060
74060
83961
93961
104060
113961
123961
133961
143961
153961
163961
173961
183961
193961
204060
214060
223961
233961
243961
253961
263961
273961
283961
293862
303862
313763

Chance of precipitation in May

Any precipitation

Ojiya gets around 127 mm of rain over 13.9 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 45% and peaks near 47% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
145
245
345
445
545
645
745
846
946
1046
1146
1247
1347
1447
1547
1647
1747
1847
1946
2046
2145
2245
2344
2443
2543
2642
2742
2841
2941
3041
3140

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 (%)
19271
29181
39091
489101
588111
687121
785132
884142
983152
1082162
1181172
1281172
1379183
1478193
1578193
1677203
1777203
1875214
1974224
2072235
2171245
2269256
2368266
2466277
2565287
2662308
2760319
28573310
29543511
30523612
31483813

Wind in May

Winds average 7 km/h in May.

Across May, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 30 min at the start of May to 14 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over May. Sunrise moves from 4:57 AM to 4:32 AM, and sunset from 6:27 PM to 6:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.54:576:27
213.64:556:28
313.64:546:29
413.64:536:30
513.74:526:31
613.74:516:32
713.74:506:33
813.84:496:34
913.84:486:35
1013.84:476:36
1113.84:466:37
1213.94:456:37
1313.94:446:38
1413.94:436:39
1514.04:426:40
1614.04:416:41
1714.04:406:42
1814.14:406:43
1914.14:396:43
2014.14:386:44
2114.14:376:45
2214.24:376:46
2314.24:366:47
2414.24:356:48
2514.24:356:48
2614.34:346:49
2714.34:346:50
2814.34:336:51
2914.34:336:51
3014.34:326:52
3114.44:326:53

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.67 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 1.86 kWh/m² to a high of 5.67 kWh/m² in May across the year — May's 5.67 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.6Bright
115.6Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in May

Hazard calendar for Ojiya

In seasonPeak

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

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

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

Is May a good time to visit Ojiya?

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

6.0
Sightseeing
1st-best month of the year
4.1
Beach & pool
5th-best month of the year

May is a reasonable time to visit Ojiya for sightseeing.

What to pack for Ojiya in May

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

In May, Ojiya sees daytime highs around 22°C and nights near 11°C. Worth packing: rain gear and sun protection. About 14 days see rain.

rain gearsun protection

Sea temperature near Ojiya in May

The nearest coast averages about 15°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 18 km away) is warmest in August at about 27°C and coldest in March near 10°C.

It's comfortable for a long swim from Jun 21 to Oct 31 — about 4.4 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan12Bracing
Feb11Bracing
Mar10Bracing
Apr11Bracing
May15Bracing
Jun20Cool
Jul23Refreshing
Aug27Warm
Sep25Warm
Oct22Refreshing
Nov18Cool
Dec15Cool

UV index in Ojiya 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 Ojiya peaks around August 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 12UV 10Dec 21UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Moderate

Air quality in Ojiya 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 Ojiya is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1723 µg/m³Dec 1610 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb15Moderate
Mar22Moderate
Apr23Moderate
May22Moderate
Jun19Moderate
Jul17Moderate
Aug14Moderate
Sep12Moderate
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Ojiya?

Ojiya sits at 37.3°N, 138.8°E, 72 m above sea level, in Japan. The nearest listed city is Uonuma, 16 km away.

Topography around Ojiya

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

Within 3 km, the terrain around Ojiya has significant variations in elevation — a maximum elevation change of 296 m around an average of 107 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 711 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,554 m.

The land around Ojiya is covered by trees (42%), cropland (22%) and artificial surfaces (22%) within 3 km, trees (74%) within 16 km, and trees (62%) and water (26%) within 80 km.

3 km
296 m
16 km
711 m
80 km
2,554 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Uonuma 16 km · Nagaoka 17 km · Tōkamachi 19 km · Kashiwazaki 23 km · Minamiuonuma 25 km · Tochio-honchō 26 km · Muikamachi 27 km · Mitsuke 28 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 Ojiya (37.3°, 138.8°, elevation 72 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).