Tsuiki weather in September

In September, Tsuiki sees average daytime highs of 27°C and overnight lows near 22°C, with 157 mm of rain across 11.9 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 29°C in the first days to 25°C by the end. The sky is clear or mostly clear about 34% 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 Tsuiki's 4th-clearest and 8th-windiest month. For the whole year in context, see Tsuiki's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
22°
10th coldest
Rainfall
157 mm
11.9 wet days
Daylight
12 h 12 min
6:04 AM – 6:16 PM
Cloud cover
60%
4th clearest
Wind
10 km/h
8th windiest
Solar energy
4.12 kWh/m²
Travel score
6.1
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 Tsuiki reaches about 27°C in the afternoon and slips back to 22°C overnight — a 5°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 5°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12924
22924
32924
42924
52923
62823
72823
82823
92823
102823
112823
122822
132722
142722
152722
162722
172722
182721
192721
202621
212621
222621
232621
242620
252620
262520
272520
282520
292520
302519

How September really feels in Tsuiki

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.

Tsuiki 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 / 689.91.5101.8
Feb10° / 759.61.210.72.2
Mar13° / 12411.40.211.73.7
Apr18° / 11°13811012.85.6
May22° / 16°15510.5013.76.6
Jun25° / 20°27814.6014.25.8
Jul29° / 24°23815.10144.7
Aug30° / 25°13212.3013.34.5
Sep27° / 22°15711.9012.26.1
Oct22° / 17°1007.8011.27.1
Nov17° / 11°828.5010.35.6
Dec12° / 6810.10.39.83.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 51%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24654
34654
44654
54753
64852
74852
84951
94951
104951
115050
125050
135050
145050
155050
164852
174951
184852
194852
204951
214852
224852
234951
244951
254951
265050
275050
285149
295149
305149

Chance of precipitation in September

Any precipitation

Tsuiki gets around 157 mm of rain over 11.9 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 39% and peaks near 45% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
145
245
344
444
544
643
743
843
942
1042
1141
1241
1340
1439
1539
1638
1738
1837
1937
2036
2136
2236
2335
2435
2534
2634
2733
2833
2932
3032

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 33% of days. Sticky, muggy-or-worse air turns up on roughly 66% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1017255512
2018265411
3019275310
401928539
5011029528
6021230507
7021331486
8021432475
9031532455
10131632435
11141733414
12151833394
13161933374
14272032363
15282132343
16392232323
173102331303
184112431282
194112531262
205122630252
215132730232
226142829212
237152829192
247162928181
258172928161
269183027151
2710202926141
2811203026121
2912213025110
3013223024100

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 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
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
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 5:54 AM to 6:14 AM, and sunset from 6:38 PM to 5:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:546:38
212.75:546:36
312.75:556:35
412.65:566:33
512.65:566:32
612.65:576:31
712.55:586:29
812.55:586:28
912.55:596:26
1012.46:006:25
1112.46:016:24
1212.36:016:22
1312.36:026:21
1412.36:036:19
1512.26:036:18
1612.26:046:16
1712.26:056:15
1812.16:056:13
1912.16:066:12
2012.16:076:11
2112.06:086:09
2212.06:086:08
2312.06:096:06
2411.96:106:05
2511.96:106:03
2611.86:116:02
2711.86:126:01
2811.86:135:59
2911.76:135:58
3011.76:145:56

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.12 kWh/m².

For context, solar energy here swings from a low near 2.16 kWh/m² to a high of 5.42 kWh/m² in May across the year — September's 4.12 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.4Bright
44.4Bright
54.4Bright
64.4Bright
74.3Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.1Bright
194.1Bright
204.0Bright
214.0Bright
224.0Bright
234.0Moderate
244.0Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.9Moderate
293.9Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Tsuiki

In seasonPeak

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

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

Tsuiki's rainy season runs April–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 Tsuiki?

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

6.1
Sightseeing
3rd-best month of the year
6.3
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Tsuiki for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Tsuiki in September

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

In September, Tsuiki sees daytime highs around 27°C and nights near 22°C. Pack light clothes. Worth having: rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Tsuiki 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 offshore is warmest in August at about 27°C and coldest in February near 12°C.

It's comfortable for a long swim from Jun 6 to Nov 9 — about 5.2 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan13Bracing
Feb12Bracing
Mar12Bracing
Apr14Bracing
May18Cool
Jun21Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov19Cool
Dec16Cool

UV index in Tsuiki 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 Tsuiki peaks around June 21 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 highModerateJun 21UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr8Very high
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Tsuiki 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 Tsuiki is worst in March — around 27 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2026 µg/m³Oct 1212 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb20Moderate
Mar27Moderate
Apr24Moderate
May21Moderate
Jun18Moderate
Jul16Moderate
Aug19Moderate
Sep13Moderate
Oct12Good
Nov14Moderate
Dec13Moderate
Location & terrain

Where is Tsuiki?

Tsuiki sits at 33.7°N, 131.0°E, 15 m above sea level, in Japan. The nearest listed city is Yukuhashi, 8.0 km away.

Topography around Tsuiki

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

Within 3 km, the terrain around Tsuiki has only modest variations in elevation — a maximum elevation change of 95 m around an average of 16 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 822 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,799 m.

The land around Tsuiki is covered by cropland (28%), artificial surfaces (27%) and water (21%) within 3 km, trees (38%) and water (38%) within 16 km, and trees (48%) and water (36%) within 80 km.

3 km
95 m
16 km
822 m
80 km
1,799 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Yukuhashi 8.0 km · Buzen 11 km · Miyako 11 km · Kanda 13 km · Nakatsu 16 km · Kawasaki 22 km · Tagawa 22 km · Akaike 25 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 Tsuiki (33.6731°, 131.0378°, elevation 15 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).