Kosai weather in July

In July, Kosai sees average daytime highs of 30°C and overnight lows near 24°C, with 250 mm of rain across 15.8 wet days and about 14.1 hours of daylight. It is the 2nd-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 28°C in the first days to 31°C by the end. The sky is clear or mostly clear about 19% of the time in July, and the air most often feels oppressive.

Daylight stretches from about 14 h 18 min at the start of July to 13 h 48 min by month's end. Set against the rest of the year, July is Kosai's 11th-clearest and 11th-windiest month. For the whole year in context, see Kosai's year-round climate.

Daytime high
30°
2nd warmest
Overnight low
24°
11th coldest
Rainfall
250 mm
15.8 wet days
Daylight
14 h 06 min
4:52 AM – 6:59 PM
Cloud cover
71%
11th clearest
Wind
11 km/h
11th windiest
Solar energy
5.04 kWh/m²
Travel score
4.2
out of 10

Kosai is city in Shizuoka Prefecture, Japan.

Density
691/km²
people per km²
Founded
1972

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 28°C in the first days to 31°C by the end.

A typical July day in Kosai reaches about 30°C in the afternoon and slips back to 24°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 34°C. Set against its neighbours, July runs about 4°C warmer than June and about 2°C cooler than August.

15°20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
12822
22822
32822
42823
52923
62923
72923
82923
92923
102923
112923
123024
133024
143024
153024
163024
173024
183024
193024
203124
213124
223124
233125
243125
253125
263125
273125
283125
293125
303225
313225

How July really feels in Kosai

Once humidity and wind are folded in, July averages 22 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
22
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in July is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Kosai weather by month

How July compares with the rest of the year at a glance. July is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan10° / 655.89.92.6
Feb11° / 816.810.73.0
Mar14° / 13510.511.74.3
Apr19° / 11°15110.412.86.0
May23° / 15°17011.313.86.5
Jun26° / 20°24215.614.35.4
Jul30° / 24°25015.814.14.2
Aug31° / 25°14415.313.33.8
Sep28° / 22°23614.612.25.2
Oct23° / 16°21111.811.16.6
Nov18° / 10°1138.910.25.9
Dec12° / 676.39.73.9

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 13% of July, with mostly cloudy or overcast conditions the remaining 68%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12278
22377
32377
42575
52575
62575
72674
82674
92674
102674
112773
122872
132872
142971
153070
163070
173070
183268
193268
203367
213565
223664
233664
243862
253961
264060
274159
284357
294357
304555
314654

Chance of precipitation in July

Any precipitation

Kosai gets around 250 mm of rain over 15.8 wet days in July, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 51% and peaks near 61% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
161
260
360
459
559
658
758
857
956
1055
1154
1253
1352
1450
1549
1648
1747
1846
1945
2045
2145
2244
2344
2444
2544
2645
2745
2845
2946
3047
3147

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the oppressive band about 54% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
111239426
211138447
311037458
41936478
50835489
60734499
706335110
806325111
905315212
1004315312
1104305313
1203295513
1303285514
1403285415
1502275615
1602265616
1701255816
1801245817
1901235818
2001225819
2101215820
2200205921
2300195922
2400195823
2500185824
2600175924
2700165925
2800165826
2900155827
3000145828
3100145828

Wind in July

Winds average 11 km/h in July.

Across July, daily wind ranges from about 10 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
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 14 h 18 min at the start of July to 13 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over July. Sunrise moves from 4:44 AM to 5:02 AM, and sunset from 7:02 PM to 6:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.34:447:02
214.34:457:02
314.34:457:02
414.34:457:02
514.34:467:02
614.34:467:02
714.24:477:02
814.24:477:02
914.24:487:01
1014.24:497:01
1114.24:497:01
1214.24:507:00
1314.24:507:00
1414.14:517:00
1514.14:516:59
1614.14:526:59
1714.14:536:59
1814.14:536:58
1914.14:546:58
2014.04:556:57
2114.04:556:57
2214.04:566:56
2314.04:576:55
2414.04:576:55
2513.94:586:54
2613.94:596:53
2713.95:006:53
2813.95:006:52
2913.85:016:51
3013.85:026:50
3113.85:026:50

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 5.04 kWh/m².

For context, solar energy here swings from a low near 2.62 kWh/m² to a high of 5.4 kWh/m² in May across the year — July's 5.04 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.9Bright
104.9Bright
114.9Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.1Bright
175.1Bright
185.1Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
315.3Bright
Planning a trip in July

Hazard calendar for Kosai

In seasonPeak

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

Kosai 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 July a good time to visit Kosai?

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

4.2
Sightseeing
8th-best month of the year
5.7
Beach & pool
3rd-best month of the year

July is a reasonable time to visit Kosai for sightseeing.

What to pack for Kosai in July

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

In July, Kosai sees daytime highs around 30°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 16 days see rain.

light clothesrain gearsun protection

Sea temperature near Kosai in July

The nearest coast averages about 25°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 13 km away) is warmest in August at about 27°C and coldest in February near 16°C.

It's comfortable for a long swim from May 25 to Nov 28 — about 6.2 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb16Cool
Mar16Cool
Apr17Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov21Refreshing
Dec19Cool

UV index in Kosai in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Kosai peaks around July 15 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 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 15UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Kosai in July

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where July falls, not just the annual average.

Air quality in Kosai is worst in April — around 25 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (July, 15 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1325 µg/m³Jul 2415 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb19Moderate
Mar25Moderate
Apr25Moderate
May24Moderate
Jun20Moderate
Jul15Moderate
Aug15Moderate
Sep16Moderate
Oct18Moderate
Nov18Moderate
Dec16Moderate
Location & terrain

Where is Kosai?

Kosai sits at 34.7°N, 137.5°E, 30 m above sea level, in Japan. The nearest listed city is Arai, 4.0 km away.

Topography around Kosai

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

Within 3 km, the terrain around Kosai has only modest variations in elevation — a maximum elevation change of 83 m around an average of 33 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 463 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,300 m.

The land around Kosai is covered by trees (41%) and artificial surfaces (31%) within 3 km, water (47%) and trees (25%) within 16 km, and water (43%) and trees (42%) within 80 km.

3 km
83 m
16 km
463 m
80 km
2,300 m
treesgrasslandcroplandartificial surfacesbare terrainwater
July weather nearby: Arai 4.0 km · Toyohashi 15 km · Toyokawa 17 km · Kozakai-chō 19 km · Hamamatsu 19 km · Shinshiro 22 km · Tahara 24 km · Hamakita 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 Kosai (34.7005°, 137.5225°, elevation 30 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).