Koga weather in July

In July, Koga sees average daytime highs of 29°C and overnight lows near 22°C, with 209 mm of rain across 18.7 wet days and about 14.2 hours of daylight. It is the 2nd-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 27°C in the first days to 30°C by the end. The sky is clear or mostly clear about 13% of the time in July, and the air most often feels oppressive.

Daylight stretches from about 14 h 24 min at the start of July to 13 h 54 min by month's end. Set against the rest of the year, July is Koga's 11th-clearest and 9th-windiest month. For the whole year in context, see Koga's year-round climate.

Daytime high
29°
2nd warmest
Overnight low
22°
11th coldest
Rainfall
209 mm
18.7 wet days
Daylight
14 h 12 min
4:40 AM – 6:54 PM
Cloud cover
78%
11th clearest
Wind
7 km/h
9th windiest
Solar energy
4.37 kWh/m²
Travel score
4.3
out of 10

Koga is city in Ibaraki Prefecture, Japan.

Density
1,128/km²
people per km²
Founded
2005

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 27°C in the first days to 30°C by the end.

A typical July day in Koga reaches about 29°C in the afternoon and slips back to 22°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 34°C. Set against its neighbours, July runs about 4°C warmer than June and about 1°C cooler than August.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12721
22721
32821
42821
52821
62821
72821
82821
92822
102822
112922
122922
132922
142922
152922
162922
172922
182922
192923
202923
213023
223023
233023
243023
253023
263023
273023
283023
293023
303123
313124

How July really feels in Koga

Once humidity and wind are folded in, July averages 13 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
13
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.

Koga 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 daysSnow daysDaylight (hours)Travel score
Jan / -0°5561.89.81.7
Feb / 546.92.210.62.1
Mar13° / 10611.61.311.73.5
Apr18° / 12012.60.212.95.4
May23° / 14°15313.7013.96.1
Jun25° / 18°17716.5014.45.3
Jul29° / 22°20918.7014.24.3
Aug30° / 23°16116.3013.44.1
Sep26° / 20°20616.2012.25.3
Oct21° / 14°20013.9011.15.9
Nov16° / 889.4010.15.0
Dec11° / 546.80.49.62.9

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 11% of July, with mostly cloudy or overcast conditions the remaining 76%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11981
22080
32080
42080
52179
62179
72179
82179
92278
102278
112278
122278
132278
142278
152278
162278
172278
182377
192377
202377
212476
222476
232575
242674
252773
262971
272971
283169
293268
303268
313466

Chance of precipitation in July

Any precipitation

Koga gets around 209 mm of rain over 18.7 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 59% and peaks near 65% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
165
265
365
465
565
665
765
865
965
1064
1164
1263
1363
1462
1561
1660
1759
1859
1958
2057
2157
2256
2355
2454
2554
2653
2752
2852
2951
3051
3151

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 49% of days. Sticky, muggy-or-worse air turns up on roughly 87% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
142043311
241942331
331841352
431740372
521739392
621638413
721537423
821536444
911435454
1011434465
1111333475
1211332486
1311231497
1411230507
1511228518
1611127529
17110265310
18110255311
1919245412
2019235512
2119225513
2218215614
2318205516
2417195617
2517195518
2617185519
2706175720
2806165721
2906155722
3006145723
3106145624

Wind in July

Winds average 7 km/h in July.

Across July, daily wind ranges from about 7 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
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 14 h 24 min at the start of July to 13 h 54 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 4:31 AM to 4:51 AM, and sunset from 6:58 PM to 6:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.44:316:58
214.44:326:57
314.44:326:57
414.44:336:57
514.44:336:57
614.44:346:57
714.44:346:57
814.44:356:57
914.44:356:56
1014.34:366:56
1114.34:366:56
1214.34:376:56
1314.34:386:55
1414.34:386:55
1514.34:396:54
1614.24:406:54
1714.24:406:53
1814.24:416:53
1914.24:426:52
2014.24:426:52
2114.14:436:51
2214.14:446:51
2314.14:456:50
2414.14:456:49
2514.04:466:49
2614.04:476:48
2714.04:486:47
2814.04:486:46
2913.94:496:46
3013.94:506:45
3113.94:516:44

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 4.37 kWh/m².

For context, solar energy here swings from a low near 2.38 kWh/m² to a high of 5.07 kWh/m² in May across the year — July's 4.37 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.1Bright
44.1Bright
54.2Bright
64.2Bright
74.2Bright
84.2Bright
94.2Bright
104.2Bright
114.2Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.4Bright
194.4Bright
204.4Bright
214.5Bright
224.5Bright
234.5Bright
244.6Bright
254.6Bright
264.6Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
314.7Bright
Planning a trip in July

Is July a good time to visit Koga?

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

4.3
Sightseeing
7th-best month of the year
5.3
Beach & pool
2nd-best month of the year

July is a reasonable time to visit Koga for sightseeing.

What to pack for Koga in July

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

In July, Koga sees daytime highs around 29°C and nights near 22°C. Pack light clothes and rain gear. About 19 days see rain.

light clothesrain gear

Sea temperature near Koga in July

The nearest coast averages about 23°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 64 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 3 — about 4.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Koga 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 Koga peaks around July 16 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 16UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Koga 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 Koga is worst in April — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1426 µg/m³Dec 1814 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb21Moderate
Mar25Moderate
Apr26Moderate
May24Moderate
Jun20Moderate
Jul17Moderate
Aug16Moderate
Sep16Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Koga?

Koga sits at 36.2°N, 139.7°E, 17 m above sea level, in Japan. The nearest listed city is Nogi, 5.0 km away.

Topography around Koga

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

Within 3 km, the terrain around Koga has only modest variations in elevation — a maximum elevation change of 27 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 197 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,553 m.

The land around Koga is covered by artificial surfaces (57%) and cropland (26%) within 3 km, cropland (49%) and artificial surfaces (33%) within 16 km, and trees (46%), artificial surfaces (27%) and cropland (20%) within 80 km.

3 km
27 m
16 km
197 m
80 km
2,553 m
treesgrasslandcroplandartificial surfaceswaterwetland
July weather nearby: Nogi 5.0 km · Kurihashi 6.0 km · Fujioka 10 km · Washinomiya 11 km · Sakai 12 km · Satte 12 km · Kazo 13 km · Kukichūō 13 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 Koga (36.1833°, 139.7167°, elevation 17 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. 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).