Matsumoto weather in September

In September, Matsumoto sees average daytime highs of 23°C and overnight lows near 15°C, with 199 mm of rain across 15.8 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 20°C by the end. The sky is clear or mostly clear about 18% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Matsumoto's 10th-clearest and 9th-windiest month. For the whole year in context, see Matsumoto's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
15°
10th coldest
Rainfall
199 mm
15.8 wet days
Daylight
12 h 12 min
5:36 AM – 5:49 PM
Cloud cover
69%
10th clearest
Wind
5 km/h
9th windiest
Solar energy
4.07 kWh/m²
Travel score
5.6
out of 10

Matsumoto is city in Nagano Prefecture, Japan.

Founded
1889

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 25°C in the first days to 20°C by the end.

A typical September day in Matsumoto reaches about 23°C in the afternoon and slips back to 15°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 27°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12517
22517
32517
42517
52517
62517
72516
82416
92416
102416
112416
122416
132415
142315
152315
162315
172314
182314
192214
202214
212214
222213
232113
242113
252113
262112
272112
282012
292012
302012

How September really feels in Matsumoto

Once humidity and wind are folded in, September 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

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

Matsumoto weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -7°10615.316.29.80.0
Feb / -6°9812.512.210.60.0
Mar / -2°1551510.611.70.8
Apr13° / 13813.72.412.93.5
May19° / 15614.20.113.95.4
Jun22° / 14°22418.2014.45.1
Jul26° / 18°24619.3014.25.1
Aug27° / 18°15515013.45.6
Sep23° / 15°19915.8012.25.6
Oct17° / 19415.30.111.14.8
Nov11° / 11513.32.810.12.6
Dec / -4°10715.512.89.60.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13763
23664
33664
43664
53664
63763
73763
83664
93664
103763
113763
123763
133763
143565
153565
163565
173664
183565
193466
203466
213466
223466
233466
243466
253565
263664
273565
283565
293565
303565

Chance of precipitation in September

Any precipitation

Matsumoto gets around 199 mm of rain over 15.8 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 54% and peaks near 55% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
154
254
354
454
554
654
754
854
954
1053
1153
1253
1353
1453
1553
1653
1753
1853
1953
2053
2153
2253
2353
2453
2554
2654
2754
2855
2955
3055

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 33% of days. Sticky, muggy-or-worse air turns up on roughly 5% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
16245614
27255513
38265313
49275212
510285111
611285011
712294910
81330489
91531468
101632448
111832437
122033416
132233395
142533375
152833354
163133333
173333313
183633292
193932262
204332242
214631221
224930201
235130181
245429161
255728141
266027121
276227110
28652690
29672580
30692470

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 5:24 AM to 5:47 AM, and sunset from 6:12 PM to 5:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:246:12
212.85:246:11
312.75:256:09
412.75:266:08
512.75:276:06
612.65:286:05
712.65:286:03
812.55:296:02
912.55:306:00
1012.55:315:59
1112.45:325:57
1212.45:325:55
1312.35:335:54
1412.35:345:52
1512.35:355:51
1612.25:365:49
1712.25:365:48
1812.15:375:46
1912.15:385:45
2012.15:395:43
2112.05:405:41
2212.05:415:40
2312.05:415:38
2411.95:425:37
2511.95:435:35
2611.85:445:34
2711.85:455:32
2811.85:455:31
2911.75:465:29
3011.75:475:28

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.07 kWh/m².

For context, solar energy here swings from a low near 2.44 kWh/m² to a high of 5.76 kWh/m² in May across the year — September's 4.07 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.4Bright
54.4Bright
64.3Bright
74.3Bright
84.3Bright
94.2Bright
104.2Bright
114.2Bright
124.1Bright
134.1Bright
144.1Bright
154.0Bright
164.0Bright
174.0Bright
184.0Moderate
193.9Moderate
203.9Moderate
213.9Moderate
223.9Moderate
233.8Moderate
243.8Moderate
253.8Moderate
263.8Moderate
273.7Moderate
283.7Moderate
293.7Moderate
303.6Moderate
Planning a trip in September

Is September a good time to visit Matsumoto?

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

5.6
Sightseeing
1st-best month of the year
4.3
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Matsumoto for sightseeing.

What to pack for Matsumoto in September

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

In September, Matsumoto sees daytime highs around 23°C and nights near 15°C. Pack rain gear. Worth having: light clothes. About 16 days see rain.

rain gearlight clothes

UV index in Matsumoto in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Matsumoto peaks around July 20 at about 10 (extreme) — 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 highExtremeVery highModerateJul 20UV 10Dec 21UV 2
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Very high
Jul10Extreme
Aug10Extreme
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Matsumoto in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Matsumoto is worst in April — around 18 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1918 µg/m³Dec 178 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar17Moderate
Apr18Moderate
May17Moderate
Jun16Moderate
Jul13Moderate
Aug12Good
Sep10Good
Oct10Good
Nov9Good
Dec8Good
Location & terrain

Where is Matsumoto?

Matsumoto sits at 36.2°N, 138.0°E, 593 m above sea level, in Japan. The nearest listed city is Azumino, 9.0 km away.

Topography around Matsumoto

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

Within 3 km, the terrain around Matsumoto has only modest variations in elevation — a maximum elevation change of 218 m around an average of 606 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,543 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,163 m.

The land around Matsumoto is covered by artificial surfaces (74%) within 3 km, trees (59%) within 16 km, and trees (87%) within 80 km.

3 km
218 m
16 km
1,543 m
80 km
3,163 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Azumino 9.0 km · Toyoshina 9.0 km · Hotaka 14 km · Shiojiri 15 km · Shimosuwa 21 km · Okaya 21 km · Suwa 25 km · Tatsuno 28 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 Matsumoto (36.2333°, 137.9667°, elevation 593 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. 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).