Imabari weather in September

In September, Imabari sees average daytime highs of 26°C and overnight lows near 21°C, with 196 mm of rain across 13.2 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 27°C in the first days to 24°C by the end. The sky is clear or mostly clear about 30% of the time in September, and the air most often feels muggy.

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 Imabari's 8th-clearest and 8th-windiest month. For the whole year in context, see Imabari's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
196 mm
13.2 wet days
Daylight
12 h 12 min
5:56 AM – 6:09 PM
Cloud cover
62%
8th clearest
Wind
10 km/h
8th windiest
Solar energy
4.37 kWh/m²
Travel score
6.2
out of 10

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 Imabari reaches about 26°C in the afternoon and slips back to 21°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 28°C. Set against its neighbours, September runs about 3°C cooler than August and about 5°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12823
22823
32723
42723
52723
62723
72723
82722
92722
102722
112622
122622
132622
142622
152621
162621
172621
182521
192521
202520
212520
222520
232520
242420
252420
262419
272419
282419
292419
302319

How September really feels in Imabari

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.

Imabari 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 / 6611.13.1101.2
Feb / 7810.63.110.71.5
Mar12° / 11812.3111.73.0
Apr16° / 11°13211.10.112.85.1
May21° / 15°15611.1013.76.2
Jun24° / 19°24914.8014.25.7
Jul27° / 23°22515.40145.3
Aug29° / 24°14213.6013.35.2
Sep26° / 21°19613.2012.26.2
Oct21° / 16°14810011.16.6
Nov16° / 11°829.2010.24.9
Dec10° / 79111.69.82.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% 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 53%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24654
34654
44654
54654
64753
74753
84654
94654
104753
114753
124753
134753
144753
154753
164753
174654
184654
194654
204753
214753
224753
234852
244852
254852
264951
274951
284951
294951
305050

Chance of precipitation in September

Any precipitation

Imabari gets around 196 mm of rain over 13.2 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 43% and peaks near 48% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
148
248
348
448
548
647
747
847
947
1046
1146
1245
1344
1444
1543
1643
1742
1842
1941
2041
2141
2240
2340
2440
2540
2639
2739
2839
2940
3040

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 31% of days. Sticky, muggy-or-worse air turns up on roughly 62% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
101829602
201931572
301932562
4011033542
5021134512
6021235492
7031336471
8131436451
9141537431
10141637411
11151837381
12261937361
13272036341
14282136330
153102335300
163112434280
174122533260
185132632240
195152731220
206162830200
216172929180
227183028170
238193127150
248203226140
259213225120
2610223325110
2711233324100
281224332390
291324332280
301425332170

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 5:45 AM to 6:06 AM, and sunset from 6:30 PM to 5:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:456:30
212.75:466:29
312.75:476:27
412.65:476:26
512.65:486:24
612.65:496:23
712.55:506:22
812.55:506:20
912.55:516:19
1012.45:526:17
1112.45:526:16
1212.45:536:14
1312.35:546:13
1412.35:556:12
1512.25:556:10
1612.25:566:09
1712.25:576:07
1812.15:576:06
1912.15:586:04
2012.15:596:03
2112.06:006:01
2212.06:006:00
2312.06:015:58
2411.96:025:57
2511.96:035:55
2611.86:035:54
2711.86:045:53
2811.86:055:51
2911.76:065:50
3011.76:065:48

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.37 kWh/m².

For context, solar energy here swings from a low near 2.35 kWh/m² to a high of 5.67 kWh/m² in May across the year — September's 4.37 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.8Bright
34.8Bright
44.8Bright
54.7Bright
64.7Bright
74.7Bright
84.6Bright
94.6Bright
104.6Bright
114.5Bright
124.5Bright
134.5Bright
144.5Bright
154.4Bright
164.4Bright
174.4Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.2Bright
254.1Bright
264.1Bright
274.1Bright
284.0Bright
294.0Bright
304.0Moderate
Planning a trip in September

Hazard calendar for Imabari

In seasonPeak

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

Imabari 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 Imabari?

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

6.2
Sightseeing
2nd-best month of the year
5.8
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Imabari for sightseeing.

What to pack for Imabari in September

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

In September, Imabari sees daytime highs around 26°C and nights near 21°C. Worth packing: light clothes and rain gear. About 13 days see rain.

light clothesrain gear

Sea temperature near Imabari in September

The nearest coast averages about 27°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 13 km away) is warmest in August at about 28°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 3 to Nov 14 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul25Warm
Aug28Warm
Sep27Warm
Oct24Refreshing
Nov20Cool
Dec17Cool

UV index in Imabari in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Imabari peaks around July 12 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 12UV 10Dec 22UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr7Very high
May9Very high
Jun10Extreme
Jul10Extreme
Aug9Very high
Sep10Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Imabari 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 Imabari is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1523 µg/m³Oct 1711 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar21Moderate
Apr23Moderate
May21Moderate
Jun19Moderate
Jul15Moderate
Aug15Moderate
Sep12Moderate
Oct11Good
Nov12Good
Dec11Good
Location & terrain

Where is Imabari?

Imabari sits at 34.1°N, 133.0°E, 6 m above sea level, in Japan. The nearest listed city is Hōjō, 23 km away.

Topography around Imabari

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

Within 3 km, the terrain around Imabari has only modest variations in elevation — a maximum elevation change of 236 m around an average of 13 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,030 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,900 m.

The land around Imabari is covered by artificial surfaces (43%) and water (38%) within 3 km, water (56%) and trees (33%) within 16 km, and trees (59%) and water (32%) within 80 km.

3 km
236 m
16 km
1,030 m
80 km
1,900 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hōjō 23 km · Saijō 24 km · Innoshima 29 km · Niihama 31 km · Takehara 31 km · Tōon 32 km · Matsuyama 34 km · Mihara 37 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 Imabari (34.07°, 133.0002°, elevation 6 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).