Annaka weather in October

In October, Annaka sees average daytime highs of 20°C and overnight lows near 12°C, with 225 mm of rain across 16.9 wet days and about 11.1 hours of daylight. It is the 6th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 18°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 Annaka's 7th-clearest and 8th-windiest month. For the whole year in context, see Annaka's year-round climate.

Daytime high
20°
6th warmest
Overnight low
12°
7th coldest
Rainfall
225 mm
16.9 wet days
Daylight
11 h 06 min
5:58 AM – 5:01 PM
Cloud cover
61%
7th clearest
Wind
5 km/h
8th windiest
Solar energy
3.04 kWh/m²
Travel score
5.3
out of 10

Annaka is city in Gunma Prefecture, Japan.

Density
206/km²
people per km²
Founded
1958

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 22°C in the first days to 18°C by the end.

A typical October day in Annaka reaches about 20°C in the afternoon and slips back to 12°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 23°C. Set against its neighbours, October runs about 5°C cooler than September and about 5°C warmer than November.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12215
22215
32215
42215
52115
62115
72114
82114
92114
102114
112014
122013
132013
142013
152013
162013
171912
181912
191912
201912
211911
221911
231811
241811
251811
261810
271810
281810
291810
301810
31179

How October really feels in Annaka

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.

Annaka weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°688.53.89.81.4
Feb / -0°719.64.110.61.6
Mar12° / 13114.43.311.73.0
Apr17° / 14814.70.412.94.9
May22° / 13°17816013.95.6
Jun24° / 17°23920.7014.44.9
Jul28° / 21°28823.2014.24.2
Aug29° / 22°22522.1013.44.1
Sep25° / 18°25719.8012.25.1
Oct20° / 12°22516.9011.15.3
Nov15° / 859.90.110.14.6
Dec10° / 618.31.19.62.6

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 13% of October, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13862
23862
33862
43862
53961
63961
73961
84060
93961
103961
113961
124060
134159
144159
154258
164159
174258
184456
194555
204555
214753
224852
234951
245050
255248
265347
275446
285545
295644
305743
315842

Chance of precipitation in October

Any precipitation

Annaka gets around 225 mm of rain over 16.9 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 53% and peaks near 60% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
160
260
360
460
560
660
760
860
959
1059
1158
1258
1357
1456
1555
1654
1754
1853
1952
2051
2150
2250
2349
2448
2547
2646
2745
2844
2943
3041
3140

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 66% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
130352871
232352661
334352551
436352450
538352340
640352240
742342030
845331930
948321730
1051311620
1154301420
1257281320
1360261220
1464251010
156723910
166922810
177220710
187419610
197717510
208016400
218215300
228314300
238513200
248612200
258811100
268910100
27909100
28918100
29928000
30937000
31946000

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
226calm
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 5:44 AM to 6:12 AM, and sunset from 5:22 PM to 4:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.65:445:22
211.65:455:21
311.65:465:19
411.55:475:18
511.55:485:17
611.45:495:15
711.45:505:14
811.45:505:12
911.35:515:11
1011.35:525:09
1111.25:535:08
1211.25:545:07
1311.25:555:05
1411.15:565:04
1511.15:575:02
1611.15:585:01
1711.05:595:00
1811.06:004:59
1910.96:014:57
2010.96:024:56
2110.96:024:55
2210.86:034:54
2310.86:044:52
2410.86:054:51
2510.76:064:50
2610.76:074:49
2710.76:084:48
2810.66:094:47
2910.66:104:46
3010.66:114:45
3110.56:124:44

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.04 kWh/m².

For context, solar energy here swings from a low near 2.44 kWh/m² to a high of 5.31 kWh/m² in May across the year — October's 3.04 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.3Moderate
23.2Moderate
33.2Moderate
43.2Moderate
53.2Moderate
63.1Moderate
73.1Moderate
83.1Moderate
93.1Moderate
103.1Moderate
113.1Moderate
123.1Moderate
133.1Moderate
143.1Moderate
153.0Moderate
163.0Moderate
173.0Moderate
183.0Moderate
193.0Moderate
203.0Moderate
213.0Moderate
223.0Moderate
233.0Moderate
243.0Moderate
253.0Moderate
263.0Moderate
273.0Moderate
283.0Moderate
293.0Moderate
303.0Moderate
312.9Moderate
Planning a trip in October

Hazard calendar for Annaka

In seasonPeak

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

Annaka's rainy season runs March–October, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is October a good time to visit Annaka?

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

5.3
Sightseeing
2nd-best month of the year
2.6
Beach & pool
6th-best month of the year

October is a reasonable time to visit Annaka for sightseeing.

What to pack for Annaka in October

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

In October, Annaka sees daytime highs around 20°C and nights near 12°C. Pack rain gear. About 17 days see rain.

rain gear

UV index in Annaka 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 Annaka peaks around July 18 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 18UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Annaka 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 Annaka is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1821 µg/m³Dec 1810 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun18Moderate
Jul15Moderate
Aug14Moderate
Sep13Moderate
Oct12Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Annaka?

Annaka sits at 36.3°N, 138.9°E, 170 m above sea level, in Japan. The nearest listed city is Tomioka, 8.0 km away.

Topography around Annaka

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

Within 3 km, the terrain around Annaka has only modest variations in elevation — a maximum elevation change of 222 m around an average of 189 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,326 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,851 m.

The land around Annaka is covered by trees (45%) and artificial surfaces (25%) within 3 km, trees (60%) and artificial surfaces (23%) within 16 km, and trees (75%) within 80 km.

3 km
222 m
16 km
1,326 m
80 km
2,851 m
treesgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Tomioka 8.0 km · Takasaki 11 km · Yoshii 12 km · Kanekomachi 13 km · Ogura 17 km · Fujioka 18 km · Maebashi 19 km · Shibukawa 19 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 Annaka (36.3301°, 138.8958°, elevation 170 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).