Iida weather in October

In October, Iida sees average daytime highs of 18°C and overnight lows near 9°C, with 210 mm of rain across 12.9 wet days and about 11.1 hours of daylight. It is the 6th-warmest and 4th-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 36% 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 36 min by month's end. Set against the rest of the year, October is Iida's 6th-clearest and 9th-windiest month. For the whole year in context, see Iida's year-round climate.

Daytime high
18°
6th warmest
Overnight low
7th coldest
Rainfall
210 mm
12.9 wet days
Daylight
11 h 06 min
6:01 AM – 5:06 PM
Cloud cover
57%
6th clearest
Wind
5 km/h
9th windiest
Solar energy
3.37 kWh/m²
Travel score
5.3
out of 10

Iida is city in Nagano Prefecture, Japan.

Density
154/km²
people per km²
Founded
1937

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 Iida reaches about 18°C in the afternoon and slips back to 9°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 14°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)
12012
22012
32012
42012
52012
61911
71911
81911
91911
101911
111910
121810
131810
141810
15189
16189
17179
18179
19178
20178
21178
22168
23167
24167
25167
26167
27156
28156
29156
30156
31156

How October really feels in Iida

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.

Iida weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -7°9911.7119.90.0
Feb / -6°10710.28.110.70.0
Mar / -2°17113.1711.71.1
Apr14° / 17412.91.412.93.6
May19° / 19113.7013.85.4
Jun22° / 14°26318014.45.0
Jul25° / 18°30820.3014.25.0
Aug27° / 19°18418.6013.35.3
Sep23° / 15°22815.5012.25.7
Oct18° / 21012.9011.15.3
Nov11° / 12610.41.210.12.9
Dec / -3°100127.99.60.3

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13961
24060
34060
44060
54159
64357
74357
84555
94555
104654
114753
124852
134951
145149
155149
165248
175347
185446
195446
205446
215545
225644
235743
245743
255743
265842
275941
285941
296040
306040
316040

Chance of precipitation in October

Any precipitation

Iida gets around 210 mm of rain over 12.9 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 51% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
151
250
350
449
548
648
747
846
945
1044
1143
1242
1341
1440
1539
1639
1738
1838
1938
2038
2137
2237
2337
2437
2537
2636
2736
2836
2935
3035
3135

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 83% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15633101
2583291
3613180
4633070
5642970
6662860
7692650
8712450
9732340
10752140
11771940
12801730
13821530
14831430
15851230
16871120
17881020
1890820
1991720
2093610
2193610
2294510
2395410
2495410
2597300
2697300
2798200
2898200
2998200
3098200
3199100

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 5 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
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in October

DaylightNight

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

Days shrink by about 60 minutes over October. Sunrise moves from 5:48 AM to 6:15 AM, and sunset from 5:27 PM to 4:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:485:27
211.65:495:26
311.65:505:24
411.55:515:23
511.55:525:21
611.55:525:20
711.45:535:18
811.45:545:17
911.35:555:16
1011.35:565:14
1111.35:575:13
1211.25:585:12
1311.25:595:10
1411.25:595:09
1511.16:005:08
1611.16:015:06
1711.06:025:05
1811.06:035:04
1911.06:045:03
2010.96:055:01
2110.96:065:00
2210.96:074:59
2310.86:084:58
2410.86:094:57
2510.86:104:55
2610.76:104:54
2710.76:114:53
2810.76:124:52
2910.66:134:51
3010.66:144:50
3110.66:154:49

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.37 kWh/m².

For context, solar energy here swings from a low near 2.52 kWh/m² to a high of 5.47 kWh/m² in May across the year — October's 3.37 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.5Moderate
43.5Moderate
53.5Moderate
63.5Moderate
73.5Moderate
83.5Moderate
93.5Moderate
103.4Moderate
113.4Moderate
123.4Moderate
133.4Moderate
143.4Moderate
153.4Moderate
163.4Moderate
173.4Moderate
183.4Moderate
193.4Moderate
203.3Moderate
213.3Moderate
223.3Moderate
233.3Moderate
243.3Moderate
253.3Moderate
263.3Moderate
273.2Moderate
283.2Moderate
293.2Moderate
303.2Moderate
313.2Moderate
Planning a trip in October

Is October a good time to visit Iida?

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

5.3
Sightseeing
3rd-best month of the year
1.6
Beach & pool
6th-best month of the year

October is a reasonable time to visit Iida for sightseeing.

What to pack for Iida in October

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

In October, Iida sees daytime highs around 18°C and nights near 9°C. Worth packing: rain gear. About 13 days see rain.

rain gear

UV index in Iida 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 Iida peaks around July 13 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 13UV 11Dec 20UV 2
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Extreme
Jul11Extreme
Aug9Very high
Sep10Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Iida 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 Iida is worst in April — around 18 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (December, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1818 µg/m³Dec 168 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar16Moderate
Apr18Moderate
May17Moderate
Jun15Moderate
Jul11Good
Aug11Good
Sep10Good
Oct9Good
Nov8Good
Dec8Good
Location & terrain

Where is Iida?

Iida sits at 35.5°N, 137.8°E, 517 m above sea level, in Japan. The nearest listed city is Komagane, 24 km away.

Topography around Iida

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

Within 3 km, the terrain around Iida has large variations in elevation — a maximum elevation change of 733 m around an average of 565 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,037 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,167 m.

The land around Iida is covered by artificial surfaces (53%) and trees (36%) within 3 km, trees (86%) within 16 km, and trees (90%) within 80 km.

3 km
733 m
16 km
2,037 m
80 km
3,167 m
treesgrasslandcroplandartificial surfaceswater
October weather nearby: Komagane 24 km · Nakatsugawa 29 km · Ina 36 km · Ena 40 km · Minamiminowa 42 km · Kinoshita 45 km · Tatsuno 54 km · Mizunami 54 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 Iida (35.5196°, 137.8207°, elevation 517 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).