Kasama weather in September

In September, Kasama sees average daytime highs of 26°C and overnight lows near 19°C, with 175 mm of rain across 14.8 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 28°C in the first days to 24°C by the end. The sky is clear or mostly clear about 17% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Kasama's 10th-clearest and 7th-windiest month. For the whole year in context, see Kasama's year-round climate.

Daytime high
26°
3rd warmest
Overnight low
19°
10th coldest
Rainfall
175 mm
14.8 wet days
Daylight
12 h 12 min
5:26 AM – 5:40 PM
Cloud cover
70%
10th clearest
Wind
8 km/h
7th windiest
Solar energy
3.71 kWh/m²
Travel score
5.7
out of 10

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 24°C by the end.

A typical September day in Kasama reaches about 26°C in the afternoon and slips back to 19°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 30°C. Set against its neighbours, September runs about 4°C cooler than August and about 5°C warmer than October.

10°15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12822
22822
32822
42822
52821
62821
72821
82721
92721
102721
112720
122720
132720
142620
152620
162619
172619
182619
192519
202519
212518
222518
232518
242418
252418
262417
272417
282417
292317
302317

How September really feels in Kasama

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.

Kasama 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 / 566.71.69.81.6
Feb / 587.32.110.61.9
Mar12° / 10712.11.411.73.2
Apr17° / 11712.10.212.95.2
May22° / 13°14212.6013.96.1
Jun25° / 18°15215.3014.45.6
Jul28° / 22°18417.3014.24.7
Aug30° / 23°13715013.44.5
Sep26° / 19°17514.8012.25.7
Oct21° / 14°17912.4011.16.0
Nov15° / 888.5010.15.0
Dec10° / 577.30.39.62.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13763
23763
33763
43763
53664
63763
73763
83763
93565
103664
113565
123565
133565
143565
153466
163466
173466
183367
193367
203268
213367
223367
233466
243466
253466
263466
273466
283664
293664
303664

Chance of precipitation in September

Any precipitation

Kasama gets around 175 mm of rain over 14.8 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 52% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
151
251
351
452
552
652
752
852
952
1052
1152
1252
1351
1451
1551
1650
1750
1850
1949
2049
2148
2248
2347
2447
2547
2647
2746
2846
2946
3046

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 29% of days. Sticky, muggy-or-worse air turns up on roughly 54% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1021334456
2021434445
3031434435
4031535424
5031635414
6141735404
7141835393
8151835383
9161935363
10272035352
11272135332
12382234312
13492334292
144102433271
155112533251
166122632221
177132731201
188152830181
1910162929160
2011173027140
2112183126120
2213193224110
231420332390
241621342280
251722342060
261823351950
271924351740
282025361630
292126361530
302226351420

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 7 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
17calm
27calm
37calm
47calm
57calm
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 48 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 66 minutes over September. Sunrise moves from 5:14 AM to 5:38 AM, and sunset from 6:03 PM to 5:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:146:03
212.85:156:02
312.75:166:00
412.75:175:59
512.75:185:57
612.65:185:56
712.65:195:54
812.55:205:52
912.55:215:51
1012.55:225:49
1112.45:225:48
1212.45:235:46
1312.35:245:45
1412.35:255:43
1512.35:265:42
1612.25:265:40
1712.25:275:39
1812.15:285:37
1912.15:295:35
2012.15:305:34
2112.05:315:32
2212.05:315:31
2312.05:325:29
2411.95:335:28
2511.95:345:26
2611.85:355:25
2711.85:355:23
2811.85:365:21
2911.75:375:20
3011.75:385:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.71 kWh/m².

For context, solar energy here swings from a low near 2.37 kWh/m² to a high of 5.23 kWh/m² in May across the year — September's 3.71 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.2Bright
24.1Bright
34.1Bright
44.1Bright
54.0Bright
64.0Bright
74.0Moderate
83.9Moderate
93.9Moderate
103.9Moderate
113.8Moderate
123.8Moderate
133.8Moderate
143.7Moderate
153.7Moderate
163.7Moderate
173.6Moderate
183.6Moderate
193.6Moderate
203.5Moderate
213.5Moderate
223.5Moderate
233.4Moderate
243.4Moderate
253.4Moderate
263.4Moderate
273.3Moderate
283.3Moderate
293.3Moderate
303.3Moderate
Planning a trip in September

Hazard calendar for Kasama

In seasonPeak

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

Kasama 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 Kasama?

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

5.7
Sightseeing
3rd-best month of the year
5.4
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Kasama for sightseeing.

What to pack for Kasama in September

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

In September, Kasama sees daytime highs around 26°C and nights near 19°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

Sea temperature near Kasama in September

The nearest coast averages about 23°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 32 km away) is warmest in August at about 24°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 24 to Oct 28 — about 4.2 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb13Bracing
Mar13Bracing
Apr15Bracing
May17Cool
Jun19Cool
Jul22Refreshing
Aug24Warm
Sep23Refreshing
Oct21Refreshing
Nov19Cool
Dec16Cool

UV index in Kasama in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Kasama peaks around July 24 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 24UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul10Very high
Aug10Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Kasama 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 Kasama is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1821 µg/m³Dec 189 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun16Moderate
Jul14Moderate
Aug13Moderate
Sep11Good
Oct11Good
Nov10Good
Dec9Good
Location & terrain

Where is Kasama?

Kasama sits at 36.4°N, 140.3°E, 177 m above sea level, in Japan. The nearest listed city is Tomobe, 5.0 km away.

Topography around Kasama

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

Within 3 km, the terrain around Kasama has only modest variations in elevation — a maximum elevation change of 167 m around an average of 71 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 698 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,298 m.

The land around Kasama is covered by trees (58%) within 3 km, trees (66%) within 16 km, and trees (43%) and cropland (21%) within 80 km.

3 km
167 m
16 km
698 m
80 km
2,298 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Tomobe 5.0 km · Ishitsuka 15 km · Iwase 15 km · Mito 17 km · Okunoya 17 km · Omitama 18 km · Mashiko 18 km · Makabe 20 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 Kasama (36.3833°, 140.2667°, elevation 177 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).