Tsuma weather in September

In September, Tsuma sees average daytime highs of 27°C and overnight lows near 24°C, with 268 mm of rain across 15.4 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 28°C in the first days to 25°C by the end. The sky is clear or mostly clear about 32% 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 Tsuma's 9th-clearest and 5th-windiest month. For the whole year in context, see Tsuma's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
24°
10th coldest
Rainfall
268 mm
15.4 wet days
Daylight
12 h 12 min
6:03 AM – 6:15 PM
Cloud cover
61%
9th clearest
Wind
13 km/h
5th windiest
Solar energy
4.09 kWh/m²
Travel score
5.7
out of 10

Tsuma is human settlement in Japan.

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 28°C in the first days to 25°C by the end.

A typical September day in Tsuma reaches about 27°C in the afternoon and slips back to 24°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 29°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)
12825
22825
32825
42825
52825
62825
72825
82825
92725
102725
112724
122724
132724
142724
152724
162724
172724
182624
192623
202623
212623
222623
232623
242623
252623
262623
272522
282522
292522
302522

How September really feels in Tsuma

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.

Tsuma 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
Jan12° / 79710.13.6
Feb13° / 988.110.83.7
Mar15° / 11°15412.211.84.6
Apr19° / 14°17511.712.85.7
May22° / 18°20012.613.66.1
Jun25° / 22°38717.614.15.3
Jul28° / 25°22414.113.95.3
Aug29° / 26°21015.613.24.9
Sep27° / 24°26815.412.25.7
Oct23° / 20°17410.511.26.9
Nov19° / 15°1088.510.46.4
Dec14° / 10°806.39.94.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% 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 53%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14654
24555
34654
44654
54654
64753
74654
84654
94654
104753
114852
124654
134753
144753
154852
164753
174753
184753
194753
204753
214753
224753
234852
244753
254852
264852
274852
284852
294753
304852

Chance of precipitation in September

Any precipitation

Tsuma gets around 268 mm of rain over 15.4 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 50% and peaks near 56% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
155
256
356
456
555
655
755
855
955
1054
1153
1252
1351
1451
1550
1649
1748
1848
1948
2047
2147
2246
2346
2445
2545
2644
2744
2844
2943
3043

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 38% of days. Sticky, muggy-or-worse air turns up on roughly 80% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1002124639
2002134737
3003144835
4003154933
5003164931
6013185029
7014195027
8014204925
9015214924
10016224822
11117234721
12128244620
131210254418
141211264317
151313274116
161314273915
172416283813
182417283612
192519283511
202620293310
21262129329
22272230308
23382330297
24392431276
253102531266
263112531255
273122532244
283132532234
293152532223
304162532203

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze

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 5:53 AM to 6:12 AM, and sunset from 6:35 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:536:35
212.75:546:34
312.65:556:32
412.65:556:31
512.65:566:30
612.55:576:28
712.55:576:27
812.55:586:26
912.45:586:24
1012.45:596:23
1112.46:006:21
1212.36:006:20
1312.36:016:19
1412.36:026:17
1512.26:026:16
1612.26:036:15
1712.26:046:13
1812.16:046:12
1912.16:056:10
2012.16:056:09
2112.06:066:08
2212.06:076:06
2312.06:076:05
2411.96:086:04
2511.96:096:02
2611.96:096:01
2711.86:105:59
2811.86:115:58
2911.86:115:57
3011.76:125:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.09 kWh/m².

For context, solar energy here swings from a low near 2.72 kWh/m² to a high of 5.12 kWh/m² in July across the year — September's 4.09 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.5Bright
34.5Bright
44.5Bright
54.4Bright
64.4Bright
74.4Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.1Bright
174.1Bright
184.1Bright
194.0Bright
204.0Bright
214.0Bright
224.0Moderate
234.0Moderate
243.9Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.8Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Tsuma

In seasonPeak

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

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

Tsuma'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 Tsuma?

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

5.7
Sightseeing
4th-best month of the year
5.8
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Tsuma for sightseeing.

What to pack for Tsuma in September

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

In September, Tsuma sees daytime highs around 27°C and nights near 24°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

Sea temperature near Tsuma 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 21 km away) is warmest in August at about 28°C and coldest in February near 18°C.

It's comfortable for a long swim from Apr 22 to Jan 1 — about 8.4 months when the water holds above 20°C.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan19Cool
Feb18Cool
Mar18Cool
Apr20Cool
May22Refreshing
Jun24Refreshing
Jul26Warm
Aug28Warm
Sep27Warm
Oct25Warm
Nov23Refreshing
Dec21Refreshing

UV index in Tsuma 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 Tsuma 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 Tsuma 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 Tsuma 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 Tsuma?

Tsuma sits at 32.1°N, 131.4°E, 11 m above sea level, in Japan. The nearest listed city is Saito, 2.0 km away.

Topography around Tsuma

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

Within 3 km, the terrain around Tsuma has only modest variations in elevation — a maximum elevation change of 131 m around an average of 30 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,020 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,714 m.

The land around Tsuma is covered by cropland (38%), trees (29%) and artificial surfaces (23%) within 3 km, trees (59%) within 16 km, and trees (64%) and water (28%) within 80 km.

3 km
131 m
16 km
1,020 m
80 km
1,714 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Saito 2.0 km · Shintomi 9.0 km · Takanabe 10 km · Kawaminami 14 km · Honjō 14 km · Miyazaki 20 km · Kobayashi 41 km · Hyūga 42 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 Tsuma (32.1°, 131.4°, elevation 11 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).