Anan weather in September

In September, Anan sees average daytime highs of 26°C and overnight lows near 24°C, with 221 mm of rain across 13.5 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 27°C in the first days to 24°C by the end. The sky is clear or mostly clear about 37% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Anan's 8th-clearest and 8th-windiest month. For the whole year in context, see Anan's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
24°
10th coldest
Rainfall
221 mm
13.5 wet days
Daylight
12 h 12 min
5:49 AM – 6:02 PM
Cloud cover
58%
8th clearest
Wind
20 km/h
8th windiest
Solar energy
4.22 kWh/m²
Travel score
6.2
out of 10

Anan is city in Tokushima Prefecture, Japan.

Density
252/km²
people per km²
Founded
1958

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 27°C in the first days to 24°C by the end.

A typical September day in Anan reaches about 26°C in the afternoon and slips back to 24°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 27°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12725
22725
32725
42725
52725
62725
72725
82725
92725
102625
112624
122624
132624
142624
152624
162624
172624
182624
192523
202523
212523
222523
232523
242523
252523
262522
272422
282422
292422
302422

Anan weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan11° / 789.5102.6
Feb11° / 8410.210.72.7
Mar14° / 10°12811.711.73.8
Apr17° / 14°13710.612.85.3
May20° / 18°16510.613.76.1
Jun23° / 21°24313.814.25.8
Jul26° / 25°18711.8146.3
Aug27° / 26°1149.413.36.6
Sep26° / 24°22113.512.26.2
Oct22° / 20°21211.211.16.6
Nov18° / 15°1048.610.25.9
Dec13° / 10°8489.83.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 51%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
24951
35050
45050
54951
64951
74951
84852
94852
104951
114951
124852
134852
144951
154753
164753
174852
184852
194852
204753
214852
224951
234951
244951
254951
265050
275050
285050
295050
305050

Chance of precipitation in September

Any precipitation

Anan gets around 221 mm of rain over 13.5 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 44% and peaks near 46% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
140
241
342
443
543
644
745
845
946
1046
1146
1246
1345
1445
1545
1644
1744
1844
1944
2044
2144
2244
2344
2444
2544
2644
2744
2844
2944
3045

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 30% of days. Sticky, muggy-or-worse air turns up on roughly 72% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1005194234
2005214232
3006224231
4006234129
5017254127
6017264125
7018274024
8019284022
9029303920
100210313918
110211313817
120313323715
130414323614
141416333512
151517333311
161619333210
17162133309
18172332298
19282432277
20292632266
212102831245
223112930234
233113130224
243123229203
254133328193
264143428172
275153527162
285163627152
296173626141
306183725131

Wind in September

Winds average 20 km/h in September.

Across September, daily wind ranges from about 18 km/h on the calmest days to 22 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
118light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1120light breeze
1220light breeze
1320light breeze
1420breezy
1520breezy
1620breezy
1721breezy
1821breezy
1921breezy
2021breezy
2121breezy
2221breezy
2321breezy
2421breezy
2521breezy
2621breezy
2721breezy
2821breezy
2921breezy
3022breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 42 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 60 minutes over September. Sunrise moves from 5:39 AM to 6:00 AM, and sunset from 6:23 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:396:23
212.75:406:22
312.75:406:21
412.65:416:19
512.65:426:18
612.65:426:16
712.55:436:15
812.55:446:14
912.55:456:12
1012.45:456:11
1112.45:466:09
1212.45:476:08
1312.35:476:06
1412.35:486:05
1512.25:496:03
1612.25:496:02
1712.25:506:01
1812.15:515:59
1912.15:525:58
2012.15:525:56
2112.05:535:55
2212.05:545:53
2312.05:545:52
2411.95:555:50
2511.95:565:49
2611.85:575:47
2711.85:575:46
2811.85:585:45
2911.75:595:43
3011.76:005:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.22 kWh/m².

For context, solar energy here swings from a low near 2.45 kWh/m² to a high of 5.53 kWh/m² in May across the year — September's 4.22 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.7Bright
44.7Bright
54.6Bright
64.6Bright
74.5Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.4Bright
134.3Bright
144.3Bright
154.3Bright
164.2Bright
174.2Bright
184.2Bright
194.1Bright
204.1Bright
214.0Bright
224.0Bright
234.0Moderate
244.0Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.8Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Anan

In seasonPeak

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

Anan 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 September a good time to visit Anan?

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

6.2
Sightseeing
4th-best month of the year
5.9
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Anan for sightseeing.

What to pack for Anan in September

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

In September, Anan sees daytime highs around 26°C and nights near 24°C. Worth packing: light clothes, rain gear and a windbreaker. About 14 days see rain.

light clothesrain geara windbreaker

Sea temperature near Anan in September

The nearest coast averages about 26°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 21 km away) is warmest in August at about 27°C and coldest in February near 15°C.

It's comfortable for a long swim from May 24 to Dec 2 — about 6.3 months when the water holds above 20°C.

15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan17Cool
Feb15Cool
Mar16Cool
Apr17Cool
May19Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct24Warm
Nov22Refreshing
Dec19Cool

UV index in Anan 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 Anan peaks around July 10 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJul 10UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Very high
Jul10Extreme
Aug8Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Anan 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 Anan is worst in April — around 19 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1319 µg/m³Dec 1310 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb15Moderate
Mar19Moderate
Apr19Moderate
May17Moderate
Jun14Moderate
Jul10Good
Aug10Good
Sep10Good
Oct10Good
Nov11Good
Dec10Good
Location & terrain

Where is Anan?

Anan sits at 33.9°N, 134.7°E, 12 m above sea level, in Japan. The nearest listed city is Komatsushimachō, 11 km away.

Topography around Anan

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

Within 3 km, the terrain around Anan has significant variations in elevation — a maximum elevation change of 285 m around an average of 27 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 778 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,908 m.

The land around Anan is covered by cropland (32%), trees (29%) and artificial surfaces (28%) within 3 km, water (48%) and trees (37%) within 16 km, and water (50%) and trees (43%) within 80 km.

3 km
285 m
16 km
778 m
80 km
1,908 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Komatsushimachō 11 km · Tokushima 18 km · Ishii 25 km · Takabō 26 km · Yakami 28 km · Narutochō-mitsuishi 32 km · Kamojimachō-jōgejima 32 km · Yoshinogawa 36 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 Anan (33.9167°, 134.65°, elevation 12 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).