Honjō weather in September

In September, Honjō sees average daytime highs of 27°C and overnight lows near 21°C, with 275 mm of rain across 16.5 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 29°C in the first days to 25°C by the end. The sky is clear or mostly clear about 25% 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 Honjō's 9th-clearest and 11th-windiest month. For the whole year in context, see Honjō's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
275 mm
16.5 wet days
Daylight
12 h 12 min
6:03 AM – 6:15 PM
Cloud cover
65%
9th clearest
Wind
8 km/h
11th windiest
Solar energy
3.97 kWh/m²
Travel score
5.3
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 29°C in the first days to 25°C by the end.

A typical September day in Honjō reaches about 27°C in the afternoon and slips back to 21°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 30°C. Set against its neighbours, September runs about 3°C cooler than August and about 4°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12923
22923
32922
42922
52822
62822
72822
82822
92822
102822
112822
122821
132821
142721
152721
162721
172721
182720
192720
202720
212620
222620
232620
242619
252619
262619
272619
282519
292519
302518

How September really feels in Honjō

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.

Honjō 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° / 78710.12.9
Feb12° / 978.110.83.4
Mar15° / 1551211.84.6
Apr20° / 11°1741212.85.9
May23° / 15°20712.713.66.2
Jun25° / 19°41619.814.14.9
Jul29° / 23°26918.613.94.2
Aug30° / 24°23817.813.24.1
Sep27° / 21°27516.512.25.3
Oct23° / 15°15810.511.26.8
Nov18° / 103810.46.1
Dec13° / 786.39.94.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% 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 58%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13961
24060
34060
44060
54060
64060
74060
84060
94060
104060
114159
124159
134159
144258
154258
164357
174258
184357
194357
204357
214357
224456
234456
244456
254357
264456
274456
284555
294456
304555

Chance of precipitation in September

Any precipitation

Honjō gets around 275 mm of rain over 16.5 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 54% and peaks near 60% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
160
260
360
460
560
660
759
859
958
1058
1157
1256
1355
1455
1554
1653
1753
1852
1952
2051
2150
2250
2349
2449
2548
2647
2747
2846
2946
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 39% of days. Sticky, muggy-or-worse air turns up on roughly 71% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
100521686
200523666
301524655
401626625
501627624
601728604
702730574
802831563
913832533
1014932513
11141033493
12151133473
13261233442
14281333422
15391433402
163101632372
173111732352
184121831332
194131931311
205142030291
215152130281
226162329251
236172329231
247182428221
257192528201
268202627191
278212627170
289212627160
2910222626150
3011232626140

Wind in September

Winds average 8 km/h in September.

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

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

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 5:54 AM to 6:12 AM, and sunset from 6:35 PM to 5:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:546:35
212.75:546:34
312.65:556:32
412.65:566:31
512.65:566:30
612.55:576:28
712.55:586:27
812.55:586:26
912.45:596:24
1012.45:596:23
1112.46:006:22
1212.36:016:20
1312.36:016:19
1412.36:026:18
1512.26:036:16
1612.26:036:15
1712.26:046:13
1812.16:046:12
1912.16:056:11
2012.16:066:09
2112.06:066:08
2212.06:076:07
2312.06:086:05
2411.96:086:04
2511.96:096:02
2611.96:106:01
2711.86:106:00
2811.86:115:58
2911.86:125:57
3011.76:125:56

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.97 kWh/m².

For context, solar energy here swings from a low near 2.71 kWh/m² to a high of 5.02 kWh/m² in May across the year — September's 3.97 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.2Bright
74.2Bright
84.2Bright
94.2Bright
104.1Bright
114.1Bright
124.1Bright
134.1Bright
144.0Bright
154.0Bright
164.0Bright
174.0Moderate
184.0Moderate
193.9Moderate
203.9Moderate
213.9Moderate
223.9Moderate
233.9Moderate
243.8Moderate
253.8Moderate
263.8Moderate
273.8Moderate
283.8Moderate
293.8Moderate
303.7Moderate
Planning a trip in September

Hazard calendar for Honjō

In seasonPeak

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

Honjō sits in the Pacific typhoon belt; the season peaks July–October.

Honjō's rainy season runs May–September, when most of the year's rain falls.

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

Is September a good time to visit Honjō?

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

5.3
Sightseeing
5th-best month of the year
5.6
Beach & pool
1st-best month of the year

September is a reasonable time to visit Honjō for sightseeing.

What to pack for Honjō in September

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

In September, Honjō sees daytime highs around 27°C and nights near 21°C. Pack light clothes and rain gear. About 17 days see rain.

light clothesrain gear

Sea temperature near Honjō 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 30 km away) is warmest in August at about 28°C and coldest in February near 19°C.

It's comfortable for a long swim from Apr 14 to Jan 8 — about 8.9 months when the water holds above 20°C.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan20Cool
Feb19Cool
Mar19Cool
Apr20Refreshing
May22Refreshing
Jun24Refreshing
Jul26Warm
Aug28Warm
Sep27Warm
Oct26Warm
Nov24Refreshing
Dec21Refreshing

UV index in Honjō 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 Honjō peaks around June 22 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 22UV 11Jan 1UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar7High
Apr8Very high
May9Very high
Jun11Extreme
Jul11Extreme
Aug10Very high
Sep10Very high
Oct7High
Nov5Moderate
Dec3Moderate

Air quality in Honjō 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 Honjō is worst in March — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (July, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2025 µg/m³Jul 2214 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb20Moderate
Mar26Moderate
Apr23Moderate
May22Moderate
Jun18Moderate
Jul14Moderate
Aug14Moderate
Sep14Moderate
Oct15Moderate
Nov16Moderate
Dec15Moderate
Location & terrain

Where is Honjō?

Honjō sits at 32.0°N, 131.3°E, 20 m above sea level, in Japan. The nearest listed city is Miyazaki, 11 km away.

Topography around Honjō

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

Within 3 km, the terrain around Honjō has only modest variations in elevation — a maximum elevation change of 126 m around an average of 35 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 912 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,714 m.

The land around Honjō is covered by trees (49%) and cropland (29%) within 3 km, trees (62%) within 16 km, and trees (62%) and water (30%) within 80 km.

3 km
126 m
16 km
912 m
80 km
1,714 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Miyazaki 11 km · Saito 13 km · Tsuma 14 km · Shintomi 17 km · Takanabe 23 km · Kawaminami 28 km · Mochibaru 32 km · Kobayashi 33 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 Honjō (31.9833°, 131.3333°, elevation 20 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).