Hagi weather in December

In December, Hagi sees average daytime highs of 11°C and overnight lows near 5°C, with 91 mm of precipitation across 13.4 wet days and about 9.7 hours of daylight. It is the 10th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 13°C in the first days to 10°C by the end. The sky is clear or mostly clear about 17% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 54 min at the start of December to 9 h 42 min by month's end. Set against the rest of the year, December is Hagi's 8th-clearest and 3rd-windiest month. For the whole year in context, see Hagi's year-round climate.

Daytime high
11°
10th warmest
Overnight low
3rd coldest
Precipitation
91 mm
13.4 wet days
Daylight
9 h 42 min
7:19 AM – 5:02 PM
Cloud cover
63%
8th clearest
Wind
14 km/h
3rd windiest
Solar energy
2.08 kWh/m²
Travel score
2.5
out of 10

Hagi is city in Yamaguchi Prefecture, Japan.

Density
64/km²
people per km²
Founded
2005

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 13°C in the first days to 10°C by the end.

A typical December day in Hagi reaches about 11°C in the afternoon and slips back to 5°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 15°C. Set against its neighbours, December runs about 5°C cooler than November and about 3°C warmer than January.

10°15°20°151015202531
Avg high (°C)Avg low (°C)
1137
2137
3137
4137
5137
6126
7126
8126
9126
10126
11116
12116
13116
14115
15115
16115
17115
18115
19115
20105
21105
22105
23105
24105
25105
26104
27104
28104
29104
30104
31104

How December really feels in Hagi

Once humidity and wind are folded in, December 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

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Hagi weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 9014.13.6101.4
Feb10° / 8512.63.110.71.8
Mar13° / 126130.911.73.4
Apr18° / 10°12111.1012.85.5
May22° / 15°13510.8013.86.5
Jun25° / 19°22414.1014.35.9
Jul29° / 23°26915.6014.14.8
Aug30° / 24°16913.5013.34.4
Sep27° / 21°18912.9012.26.0
Oct22° / 15°1039.3011.16.9
Nov16° / 10°909.9010.25.2
Dec11° / 9113.41.69.72.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 25% of December, with mostly cloudy or overcast conditions the remaining 58%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
24852
34753
44753
54555
64555
74357
84456
94357
104258
114258
124159
134159
144159
154159
164060
174060
184060
194060
204060
214159
224159
234159
244159
254159
264159
274159
284159
294159
304159
314159

Chance of precipitation in December

Any precipitationSnow

Hagi gets around 91 mm of rain and snow over 13.4 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 43% and peaks near 44% on the wettest days, and about 2 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1391
2391
3401
4402
5412
6412
7412
8422
9422
10423
11433
12433
13433
14434
15444
16444
17445
18445
19445
20446
21446
22447
23447
24448
25448
26438
27439
28439
29429
30429
314210

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1982
2982
3982
4982
5982
6991
7991
8991
9991
10991
11991
12991
13991
14991
15991
16991
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in December

Winds average 14 km/h in December.

Across December, daily wind ranges from about 13 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze
3115light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 54 min at the start of December to 9 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:08 AM to 7:26 AM, and sunset from 5:00 PM to 5:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.97:085:00
29.97:095:00
39.87:105:00
49.87:115:00
59.87:115:00
69.87:125:00
79.87:135:00
89.87:145:00
99.87:145:00
109.87:155:00
119.77:165:01
129.77:175:01
139.77:175:01
149.77:185:01
159.77:195:02
169.77:195:02
179.77:205:02
189.77:205:03
199.77:215:03
209.77:215:03
219.77:225:04
229.77:225:04
239.77:235:05
249.77:235:05
259.77:245:06
269.77:245:06
279.77:245:07
289.77:255:07
299.77:255:08
309.77:255:09
319.77:265:09

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.08 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.08 kWh/m² to a high of 5.66 kWh/m² in May across the year — December's 2.08 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.2Moderate
22.2Moderate
32.2Moderate
42.2Moderate
52.2Moderate
62.1Moderate
72.1Moderate
82.1Moderate
92.1Moderate
102.1Moderate
112.1Moderate
122.1Moderate
132.1Moderate
142.1Moderate
152.0Moderate
162.0Moderate
172.0Moderate
182.0Moderate
192.1Moderate
202.1Moderate
212.1Moderate
222.1Moderate
232.1Moderate
242.1Moderate
252.1Moderate
262.1Moderate
272.1Moderate
282.1Moderate
292.1Moderate
302.2Moderate
312.2Moderate
Planning a trip in December

Hazard calendar for Hagi

In seasonPeak

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

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

Hagi's rainy season runs March–September, 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 December a good time to visit Hagi?

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

2.5
Sightseeing
10th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Hagi.

What to pack for Hagi in December

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

In December, Hagi sees daytime highs around 11°C and nights near 5°C. Pack a warm layer. Worth having: rain gear. About 13 days see rain.

a warm layerrain gear

Sea temperature near Hagi in December

The nearest coast averages about 18°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 25 km away) is warmest in August at about 27°C and coldest in February near 14°C.

It's comfortable for a long swim from Jun 9 to Nov 20 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Cool
Feb14Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul24Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov20Refreshing
Dec18Cool

UV index in Hagi in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hagi peaks around June 23 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 highModerateJun 23UV 10Dec 21UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Hagi in December

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Hagi is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 1023 µg/m³Oct 1111 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar23Moderate
Apr23Moderate
May20Moderate
Jun16Moderate
Jul13Moderate
Aug15Moderate
Sep11Good
Oct11Good
Nov13Moderate
Dec12Moderate
Location & terrain

Where is Hagi?

Hagi sits at 34.4°N, 131.4°E, 31 m above sea level, in Japan. The nearest listed city is Nagato, 20 km away.

Topography around Hagi

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

Within 3 km, the terrain around Hagi has significant variations in elevation — a maximum elevation change of 442 m around an average of 112 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 779 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,369 m.

The land around Hagi is covered by trees (66%) and artificial surfaces (23%) within 3 km, trees (67%) and water (28%) within 16 km, and water (55%) and trees (40%) within 80 km.

3 km
442 m
16 km
779 m
80 km
1,369 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Nagato 20 km · Yamaguchi 25 km · Mine 30 km · Ogōri-shimogō 33 km · Hōfu 41 km · Sanyōonoda 47 km · Onoda 49 km · Masuda 50 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 Hagi (34.4°, 131.4167°, elevation 31 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).