Sanmu weather in March

In March, Sanmu sees average daytime highs of 13°C and overnight lows near 7°C, with 130 mm of precipitation across 13.1 wet days and about 11.7 hours of daylight. It is the 9th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 11°C in the first days to 15°C by the end. The sky is clear or mostly clear about 32% of the time in March, and the air most often feels dry.

Daylight stretches from about 11 h 12 min at the start of March to 12 h 18 min by month's end. Set against the rest of the year, March is Sanmu's 5th-clearest and 2nd-windiest month. For the whole year in context, see Sanmu's year-round climate.

Daytime high
13°
9th warmest
Overnight low
4th coldest
Precipitation
130 mm
13.1 wet days
Daylight
11 h 42 min
5:56 AM – 5:40 PM
Cloud cover
61%
5th clearest
Wind
15 km/h
2nd windiest
Solar energy
4.1 kWh/m²
Travel score
3.4
out of 10

Sanmu is city in Chiba Prefecture, Japan.

Density
330/km²
people per km²
Founded
2006

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

Temperature in March

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 11°C in the first days to 15°C by the end.

A typical March day in Sanmu reaches about 13°C in the afternoon and slips back to 7°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 9°C and 17°C. Set against its neighbours, March runs about 3°C warmer than February and about 4°C cooler than April.

10°15°20°151015202531
Avg high (°C)Avg low (°C)
1115
2115
3115
4115
5125
6125
7125
8126
9126
10126
11126
12126
13136
14136
15136
16136
17137
18137
19137
20137
21147
22147
23147
24147
25148
26148
27148
28148
29158
30158
31159

How March really feels in Sanmu

Once humidity and wind are folded in, March 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

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

Sanmu weather by month

How March compares with the rest of the year at a glance. March is the 9th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 828.70.79.92.1
Feb10° / 7790.810.72.3
Mar13° / 13013.10.511.73.4
Apr17° / 11°11212.6012.95.2
May21° / 16°12811.7013.96.1
Jun24° / 19°15913.2014.45.9
Jul28° / 23°14213.3014.25.4
Aug29° / 24°10111.1013.35.1
Sep26° / 22°16814012.25.8
Oct21° / 17°20913.2011.16.1
Nov17° / 11°10910.9010.15.2
Dec12° / 779.409.63.3

Cloud cover in March

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in March.

Beyond those clear spells, partly cloudy skies cover about 15% of March, with mostly cloudy or overcast conditions the remaining 53%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14951
24951
34852
44852
54753
64852
74852
84951
94951
104951
114852
124852
134852
144951
154852
164852
174852
184654
194654
204654
214555
224654
234555
244555
254555
264555
274456
284456
294555
304555
314555

Chance of precipitation in March

Any precipitationSnow

Sanmu gets around 130 mm of rain and snow over 13.1 wet days in March. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 41% and peaks near 44% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1393
2403
3403
4403
5412
6412
7412
8412
9402
10402
11402
12402
13401
14401
15411
16411
17411
18411
19421
20421
21421
22421
23430
24430
25430
26430
27430
28440
29440
30440
31440

Humidity in March

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, March 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 (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
10991
11991
12991
13991
14991
15991
16991
17991
18991
19991
20991
21991
22991
23991
24991
25991
26982
27982
28982
29982
30973
31973

Wind in March

Winds average 15 km/h in March.

Across March, daily wind ranges from about 15 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
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze
3115light breeze

Sunrise & sunset in March

DaylightNight

Daylight runs from about 11 h 12 min at the start of March to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over March. Sunrise moves from 6:17 AM to 5:34 AM, and sunset from 5:26 PM to 5:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.26:175:26
211.26:165:27
311.26:145:28
411.36:135:29
511.36:125:30
611.36:105:31
711.46:095:32
811.46:085:33
911.56:065:33
1011.56:055:34
1111.56:035:35
1211.66:025:36
1311.66:015:37
1411.65:595:38
1511.75:585:39
1611.75:565:40
1711.85:555:40
1811.85:535:41
1911.85:525:42
2011.95:515:43
2111.95:495:44
2212.05:485:45
2312.05:465:46
2412.05:455:46
2512.15:435:47
2612.15:425:48
2712.15:405:49
2812.25:395:50
2912.25:375:51
3012.35:365:51
3112.35:345:52

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 4.1 kWh/m².

For context, solar energy here swings from a low near 2.31 kWh/m² to a high of 5.44 kWh/m² in May across the year — March's 4.1 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
13.6Moderate
23.7Moderate
33.7Moderate
43.7Moderate
53.8Moderate
63.8Moderate
73.8Moderate
83.9Moderate
93.9Moderate
104.0Moderate
114.0Moderate
124.0Bright
134.1Bright
144.1Bright
154.1Bright
164.2Bright
174.2Bright
184.2Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.4Bright
254.4Bright
264.4Bright
274.5Bright
284.5Bright
294.5Bright
304.6Bright
314.6Bright
Planning a trip in March

Hazard calendar for Sanmu

In seasonPeak

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

Sanmu 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 March a good time to visit Sanmu?

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

3.4
Sightseeing
9th-best month of the year
0.0
Beach & pool
9th-best month of the year

March is a weaker month for outdoor sightseeing in Sanmu.

What to pack for Sanmu in March

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

In March, Sanmu sees daytime highs around 13°C and nights near 7°C. Worth packing: a warm layer and rain gear. About 13 days see rain.

a warm layerrain gear

Sea temperature near Sanmu in March

The nearest coast averages about 15°C in March — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 19 km away) is warmest in August at about 25°C and coldest in February near 15°C.

It's comfortable for a long swim from Jun 5 to Nov 22 — about 5.6 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Bracing
Mar15Cool
Apr16Cool
May19Cool
Jun21Refreshing
Jul23Refreshing
Aug25Warm
Sep25Warm
Oct23Refreshing
Nov21Refreshing
Dec18Cool

UV index in Sanmu in March

LowModerateHighVery highExtreme

Clear-sky midday UV in March peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sanmu peaks around August 12 at about 10 (extreme) — 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 highVery highModerateAug 12UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug10Extreme
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Sanmu in March

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Sanmu is worst in March — around 25 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2425 µg/m³Dec 1914 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar25Moderate
Apr25Moderate
May24Moderate
Jun19Moderate
Jul16Moderate
Aug15Moderate
Sep15Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Sanmu?

Sanmu sits at 35.6°N, 140.4°E, 52 m above sea level, in Japan. The nearest listed city is Narutō, 3.0 km away.

Topography around Sanmu

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

Within 3 km, the terrain around Sanmu has only modest variations in elevation — a maximum elevation change of 68 m around an average of 31 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 107 m; within 80 km, large variations in elevation — a maximum elevation change of 840 m.

The land around Sanmu is covered by trees (57%) and cropland (27%) within 3 km, trees (34%) and cropland (30%) within 16 km, and water (42%) and trees (23%) within 80 km.

3 km
68 m
16 km
107 m
80 km
840 m
treesgrasslandcroplandartificial surfacesbare terrainwater
March weather nearby: Narutō 3.0 km · Yokoshiba 6.0 km · Yachimata 9.0 km · Tōgane 10 km · Ryōgoku 11 km · Ōamishirasato 14 km · Yōkaichiba 14 km · Ōami 15 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 Sanmu (35.6276°, 140.4176°, elevation 52 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).