Sagamihara weather in December

In December, Sagamihara sees average daytime highs of 11°C and overnight lows near 3°C, with 76 mm of precipitation across 8.8 wet days and about 9.6 hours of daylight. It is the 10th-warmest and 12th-wettest month of the year here.

Highs ease over the month, from about 12°C in the first days to 9°C by the end. The sky is clear or mostly clear about 52% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 48 min at the start of December to 9 h 36 min by month's end. Set against the rest of the year, December is Sagamihara's 2nd-clearest and 11th-windiest month. For the whole year in context, see Sagamihara's year-round climate.

Daytime high
11°
10th warmest
Overnight low
3rd coldest
Precipitation
76 mm
8.8 wet days
Daylight
9 h 36 min
6:51 AM – 4:27 PM
Cloud cover
44%
2nd clearest
Wind
6 km/h
11th windiest
Solar energy
2.33 kWh/m²
Travel score
2.7
out of 10
Air quality
Good
PM2.5 10 µg/m³ · 2010

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 12°C in the first days to 9°C by the end.

A typical December day in Sagamihara reaches about 11°C in the afternoon and slips back to 3°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 14°C. Set against its neighbours, December runs about 5°C cooler than November and about 2°C warmer than January.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1135
2125
3125
4124
5124
6124
7124
8114
9114
10113
11113
12113
13113
14113
15113
16102
17102
18102
19102
20102
21102
22102
23102
24101
25101
2691
2791
2891
2991
3091
3191

How December really feels in Sagamihara

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 11 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
11
wind chill below the day's low

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

Sagamihara weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -0°828.53.39.91.5
Feb / 8410.13.510.71.7
Mar12° / 15415.42.311.72.8
Apr17° / 14714.40.312.94.7
May21° / 13°15813.6013.85.8
Jun24° / 18°20316.4014.45.4
Jul28° / 22°20517.4014.25.0
Aug29° / 23°16116.3013.34.8
Sep25° / 19°22916.1012.25.6
Oct20° / 14°23114.6011.15.6
Nov15° / 11011.7010.14.5
Dec11° / 768.80.59.62.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 52% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 15% of December, with mostly cloudy or overcast conditions the remaining 33%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25842
35941
45941
56040
66139
76238
86337
96337
106535
116535
126634
136634
146733
156733
166832
176832
186931
197030
207030
217129
227129
237228
247228
257327
267327
277327
287525
297525
307525
317525

Chance of precipitation in December

Any precipitationSnow

Sagamihara gets around 76 mm of rain and snow over 8.8 wet days in December, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 28% and peaks near 37% on the wettest days, and about 1 day brings snow. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1371
2371
3361
4361
5351
6341
7341
8331
9321
10321
11311
12301
13301
14291
15281
16281
17271
18261
19261
20251
21252
22242
23242
24232
25232
26223
27223
28223
29223
30224
31224

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1991
2991
3991
4991
5991
61000
71000
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in December

Winds average 6 km/h in December.

Across December, 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
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 48 min at the start of December to 9 h 36 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 6:40 AM to 6:57 AM, and sunset from 4:26 PM to 4:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.86:404:26
29.86:414:26
39.76:414:26
49.76:424:26
59.76:434:26
69.76:444:26
79.76:454:26
89.76:454:26
99.76:464:26
109.76:474:26
119.66:484:26
129.66:484:26
139.66:494:27
149.66:504:27
159.66:504:27
169.66:514:27
179.66:524:28
189.66:524:28
199.66:534:28
209.66:534:29
219.66:544:29
229.66:544:30
239.66:554:30
249.66:554:31
259.66:564:31
269.66:564:32
279.66:564:32
289.66:574:33
299.66:574:34
309.66:574:34
319.66:574:35

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.33 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.33 kWh/m² to a high of 5.09 kWh/m² in May across the year — December's 2.33 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.3Moderate
22.3Moderate
32.3Moderate
42.3Moderate
52.3Moderate
62.3Moderate
72.3Moderate
82.3Moderate
92.3Moderate
102.3Moderate
112.3Moderate
122.3Moderate
132.3Moderate
142.3Moderate
152.3Moderate
162.4Moderate
172.4Moderate
182.4Moderate
192.4Moderate
202.4Moderate
212.4Moderate
222.4Moderate
232.5Moderate
242.5Moderate
252.5Moderate
262.5Moderate
272.5Moderate
282.6Moderate
292.6Moderate
302.6Moderate
312.6Moderate
Planning a trip in December

Hazard calendar for Sagamihara

In seasonPeak

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

Sagamihara 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 December a good time to visit Sagamihara?

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

2.7
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 Sagamihara.

What to pack for Sagamihara in December

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

In December, Sagamihara sees daytime highs around 11°C and nights near 3°C. Pack a warm layer. Worth having: rain gear. About 9 days see rain.

a warm layerrain gear

Sea temperature near Sagamihara 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 50 km away) is warmest in August at about 26°C and coldest in February near 15°C.

It's comfortable for a long swim from May 31 to Nov 26 — about 5.9 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Cool
Mar16Cool
Apr17Cool
May19Cool
Jun21Refreshing
Jul24Refreshing
Aug26Warm
Sep25Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Sagamihara 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 Sagamihara peaks around July 16 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Sagamihara 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 Sagamihara is worst in April — around 15 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 7 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Sagamihara's WHO annual average of 10 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1515 µg/m³Dec 167 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb15Moderate
Mar13Moderate
Apr15Moderate
May13Moderate
Jun10Good
Jul8Good
Aug7Good
Sep7Good
Oct8Good
Nov8Good
Dec7Good
Location & terrain

Where is Sagamihara?

Sagamihara sits at 35.6°N, 139.2°E, 237 m above sea level, in Japan. The nearest listed city is Aihara, 8.0 km away.

Topography around Sagamihara

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

Within 3 km, the terrain around Sagamihara has significant variations in elevation — a maximum elevation change of 465 m around an average of 278 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,642 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,737 m.

The land around Sagamihara is covered by trees (76%) within 3 km, trees (72%) and artificial surfaces (22%) within 16 km, and trees (47%), artificial surfaces (24%) and water (21%) within 80 km.

3 km
465 m
16 km
1,642 m
80 km
3,737 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Aihara 8.0 km · Minawa 9.0 km · Hachiōji 12 km · Uenohara 13 km · Zama 16 km · Bunkyo 17 km · Itsukaichi 18 km · Akiruno 18 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 Sagamihara (35.5671°, 139.2417°, elevation 237 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).