Ōmiya weather in May

In May, Ōmiya sees average daytime highs of 20°C and overnight lows near 14°C, with 144 mm of rain across 12.5 wet days and about 13.9 hours of daylight. It is the 6th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 18°C in the first days to 21°C by the end. The sky is clear or mostly clear about 23% 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 18 min by month's end. Set against the rest of the year, May is Ōmiya's 9th-clearest and 8th-windiest month. For the whole year in context, see Ōmiya's year-round climate.

Daytime high
20°
6th warmest
Overnight low
14°
7th coldest
Rainfall
144 mm
12.5 wet days
Daylight
13 h 54 min
4:36 AM – 6:33 PM
Cloud cover
68%
9th clearest
Wind
10 km/h
8th windiest
Solar energy
5.33 kWh/m²
Travel score
5.8
out of 10

Ōmiya is city in Ibaraki Prefecture, Japan.

Density
79/km²
people per km²
Founded
2004

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 18°C in the first days to 21°C by the end.

A typical May day in Ōmiya reaches about 20°C in the afternoon and slips back to 14°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 23°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)
11811
21812
31812
41912
51912
61912
71912
81913
91913
101913
111913
121913
132013
142013
152014
162014
172014
182014
192014
202014
212015
222115
232115
242115
252115
262115
272115
282116
292116
302116
312216

How May really feels in Ōmiya

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.

Ōmiya 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
Jan / 637.31.59.81.4
Feb / 637.3210.61.5
Mar11° / 11512.51.211.72.7
Apr16° / 12111.90.212.94.5
May20° / 14°14412.5013.95.8
Jun23° / 18°15114.7014.45.6
Jul27° / 22°17816014.25.4
Aug28° / 23°13114013.45.4
Sep25° / 20°17914.7012.25.8
Oct20° / 15°19612.7011.15.9
Nov15° / 989.5010.14.7
Dec10° / 647.60.39.52.6

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 14% of May, with mostly cloudy or overcast conditions the remaining 62%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24456
34357
44357
54159
64159
74159
83961
93961
103862
113862
123862
133664
143664
153664
163664
173763
183664
193664
203664
213664
223763
233664
243664
253664
263565
273565
283565
293565
303466
313268

Chance of precipitation in May

Any precipitation

Ōmiya gets around 144 mm of rain over 12.5 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 40% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
139
239
339
439
539
639
739
839
939
1039
1140
1240
1340
1440
1541
1641
1741
1841
1941
2041
2141
2241
2341
2441
2540
2640
2740
2839
2939
3039
3139

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 54% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1811720
2791920
3772030
4762130
5742330
6732430
7712540
8702640
9682750
10662860
11652960
12633070
13613270
14593380
15573490
165535100
175236111
185037121
194838131
204639141
214439161
224240171
234040191
243840202
253641212
263441232
273341242
283141263
292940283
302740294
312540314

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 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
299calm
309calm
319calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 30 min at the start of May to 14 h 18 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 4:51 AM to 4:27 AM, and sunset from 6:20 PM to 6:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.54:516:20
213.54:506:21
313.54:496:22
413.64:486:22
513.64:476:23
613.64:466:24
713.74:456:25
813.74:446:26
913.74:436:27
1013.84:426:28
1113.84:416:29
1213.84:406:29
1313.94:396:30
1413.94:386:31
1513.94:376:32
1613.94:366:33
1714.04:366:34
1814.04:356:34
1914.04:346:35
2014.04:336:36
2114.14:336:37
2214.14:326:38
2314.14:316:38
2414.14:316:39
2514.24:306:40
2614.24:296:41
2714.24:296:42
2814.24:286:42
2914.34:286:43
3014.34:286:44
3114.34:276:44

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 2.36 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
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.4Bright
295.4Bright
305.4Bright
315.4Bright
Planning a trip in May

Hazard calendar for Ōmiya

In seasonPeak

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

Ōmiya 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 Ōmiya?

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

5.8
Sightseeing
2nd-best month of the year
3.0
Beach & pool
6th-best month of the year

May is a reasonable time to visit Ōmiya for sightseeing.

What to pack for Ōmiya in May

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

In May, Ōmiya sees daytime highs around 20°C and nights near 14°C. Worth packing: rain gear and sun protection. About 13 days see rain.

rain gearsun protection

Sea temperature near Ōmiya in May

The nearest coast averages about 17°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 27 km away) is warmest in August at about 24°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 24 to Oct 28 — about 4.2 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun19Cool
Jul22Refreshing
Aug24Warm
Sep23Refreshing
Oct21Refreshing
Nov19Cool
Dec16Cool

UV index in Ōmiya 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 Ōmiya peaks around July 24 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 highModerateJul 24UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Ōmiya 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 Ōmiya is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1821 µg/m³Dec 189 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun16Moderate
Jul14Moderate
Aug13Moderate
Sep11Good
Oct11Good
Nov10Good
Dec9Good
Location & terrain

Where is Ōmiya?

Ōmiya sits at 36.5°N, 140.4°E, 56 m above sea level, in Japan. The nearest listed city is Hitachiomiya, 2.0 km away.

Topography around Ōmiya

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

Within 3 km, the terrain around Ōmiya has only modest variations in elevation — a maximum elevation change of 123 m around an average of 52 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 511 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,902 m.

The land around Ōmiya is covered by trees (44%), artificial surfaces (23%) and cropland (22%) within 3 km, trees (66%) within 16 km, and trees (48%) and water (23%) within 80 km.

3 km
123 m
16 km
511 m
80 km
1,902 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Hitachiomiya 2.0 km · Ishitsuka 8.0 km · Hitachi-ota 10 km · Tokai 16 km · Inada 16 km · Funaishikawa 16 km · Hitachi-Naka 20 km · Katsuta 21 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 Ōmiya (36.55°, 140.4167°, elevation 56 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).