Suwa weather in October

In October, Suwa sees average daytime highs of 17°C and overnight lows near 8°C, with 170 mm of precipitation across 12.1 wet days and about 11.1 hours of daylight. It is the 6th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 15°C by the end. The sky is clear or mostly clear about 32% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of October to 10 h 30 min by month's end. Set against the rest of the year, October is Suwa's 6th-clearest and 8th-windiest month. For the whole year in context, see Suwa's year-round climate.

Daytime high
17°
6th warmest
Overnight low
7th coldest
Precipitation
170 mm
12.1 wet days
Daylight
11 h 06 min
6:01 AM – 5:05 PM
Cloud cover
60%
6th clearest
Wind
5 km/h
8th windiest
Solar energy
3.43 kWh/m²
Travel score
5.2
out of 10

Suwa is city in Nagano Prefecture, Japan.

Density
449/km²
people per km²
Founded
1941

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

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 20°C in the first days to 15°C by the end.

A typical October day in Suwa reaches about 17°C in the afternoon and slips back to 8°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 21°C. Set against its neighbours, October runs about 6°C cooler than September and about 6°C warmer than November.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12011
22011
32011
41911
51911
61911
71910
81910
91910
101810
11189
12189
13189
14189
15178
16178
17178
18178
19177
20167
21167
22167
23166
24166
25156
26156
27155
28155
29155
30145
31145

How October really feels in Suwa

Once humidity and wind are folded in, October 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

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

Suwa weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -8°8511.512.49.80.0
Feb / -7°8610.19.510.60.0
Mar / -3°14213.38.911.70.9
Apr14° / 12712.41.912.93.7
May19° / 13312.10.113.95.7
Jun22° / 14°17815.5014.45.4
Jul26° / 18°19817014.25.5
Aug27° / 18°12313.4013.45.9
Sep23° / 15°15912.8012.26.1
Oct17° / 17012.10.111.15.2
Nov11° / 9710.41.710.12.8
Dec / -4°84129.49.60.2

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 16% of October, with mostly cloudy or overcast conditions the remaining 52%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13763
23763
33961
43961
53961
64159
74060
84159
94357
104357
114357
124555
134654
144654
154852
164951
174951
184951
195149
205248
215347
225347
235446
245545
255644
265743
275842
285941
295941
305941
316040

Chance of precipitation in October

Any precipitation

Suwa gets around 170 mm of rain and snow over 12.1 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 38% and peaks near 45% on the wettest days, and about 0 day brings snow. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
145
245
345
444
544
644
743
843
942
1041
1141
1240
1339
1438
1537
1637
1736
1836
1936
2036
2135
2235
2335
2435
2535
2635
2734
2834
2934
3034
3133

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
174215
275214
376204
478193
579183
681172
782162
883152
985141
1086131
1187121
1288111
1389101
149091
159181
169271
179361
189451
199640
209730
219730
229820
239820
249910
259910
269910
279910
289910
2910000
3010000
3110000

Wind in October

Winds average 5 km/h in October.

Across October, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
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
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 36 min at the start of October to 10 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over October. Sunrise moves from 5:47 AM to 6:15 AM, and sunset from 5:26 PM to 4:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:475:26
211.65:485:24
311.65:495:23
411.55:505:21
511.55:515:20
611.45:525:18
711.45:535:17
811.45:535:16
911.35:545:14
1011.35:555:13
1111.35:565:11
1211.25:575:10
1311.25:585:09
1411.15:595:07
1511.16:005:06
1611.16:015:05
1711.06:015:03
1811.06:025:02
1911.06:035:01
2010.96:045:00
2110.96:054:58
2210.86:064:57
2310.86:074:56
2410.86:084:55
2510.76:094:54
2610.76:104:52
2710.76:114:51
2810.66:124:50
2910.66:134:49
3010.66:144:48
3110.56:154:47

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.43 kWh/m².

For context, solar energy here swings from a low near 2.54 kWh/m² to a high of 5.73 kWh/m² in May across the year — October's 3.43 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.6Moderate
43.6Moderate
53.6Moderate
63.6Moderate
73.5Moderate
83.5Moderate
93.5Moderate
103.5Moderate
113.5Moderate
123.5Moderate
133.5Moderate
143.5Moderate
153.5Moderate
163.5Moderate
173.4Moderate
183.4Moderate
193.4Moderate
203.4Moderate
213.4Moderate
223.4Moderate
233.3Moderate
243.3Moderate
253.3Moderate
263.3Moderate
273.3Moderate
283.3Moderate
293.2Moderate
303.2Moderate
313.2Moderate
Planning a trip in October

Hazard calendar for Suwa

In seasonPeak

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

Suwa 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 October a good time to visit Suwa?

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

5.2
Sightseeing
6th-best month of the year
1.4
Beach & pool
6th-best month of the year

October is a reasonable time to visit Suwa for sightseeing.

What to pack for Suwa in October

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

In October, Suwa sees daytime highs around 17°C and nights near 8°C. Worth packing: rain gear. About 12 days see rain.

rain gear

UV index in Suwa in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Suwa peaks around July 14 at about 11 (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 14UV 11Dec 21UV 2
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Extreme
Jul11Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Suwa in October

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Suwa 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 Suwa?

Suwa sits at 36.0°N, 138.1°E, 762 m above sea level, in Japan. The nearest listed city is Shimosuwa, 5.0 km away.

Topography around Suwa

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

Within 3 km, the terrain around Suwa has significant variations in elevation — a maximum elevation change of 507 m around an average of 828 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,248 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,057 m.

The land around Suwa is covered by artificial surfaces (34%), trees (27%) and water (22%) within 3 km, trees (76%) within 16 km, and trees (87%) within 80 km.

3 km
507 m
16 km
1,248 m
80 km
3,057 m
treesgrasslandcroplandartificial surfaceswater
October weather nearby: Shimosuwa 5.0 km · Chino 6.0 km · Okaya 6.0 km · Tatsuno 12 km · Shiojiri 15 km · Kinoshita 19 km · Minamiminowa 22 km · Matsumoto 25 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 Suwa (36.038°, 138.1131°, elevation 762 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). 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).