Tendō weather in September

In September, Tendō sees average daytime highs of 23°C and overnight lows near 16°C, with 126 mm of rain across 13 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 25°C in the first days to 20°C by the end. The sky is clear or mostly clear about 15% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Tendō's 7th-clearest and 10th-windiest month. For the whole year in context, see Tendō's year-round climate.

Daytime high
23°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
126 mm
13 wet days
Daylight
12 h 12 min
5:26 AM – 5:40 PM
Cloud cover
72%
7th clearest
Wind
6 km/h
10th windiest
Solar energy
3.51 kWh/m²
Travel score
5.9
out of 10

Tendō is city in Yamagata Prefecture, Japan.

Density
579/km²
people per km²
Founded
1958

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 25°C in the first days to 20°C by the end.

A typical September day in Tendō reaches about 23°C in the afternoon and slips back to 16°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 27°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12618
22518
32518
42518
52518
62518
72518
82517
92417
102417
112417
122417
132416
142316
152316
162316
172315
182315
192215
202214
212214
222214
232114
242113
252113
262113
272113
282013
292012
302012

How September really feels in Tendō

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.

Tendō weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°12621.723.19.60.0
Feb / -5°9017.918.210.50.0
Mar / -2°10916.912.211.70.5
Apr13° / 9413.72.7133.3
May19° / 9112014.15.6
Jun22° / 15°11912.5014.66.0
Jul26° / 19°18917.4014.45.4
Aug27° / 20°14714.8013.55.6
Sep23° / 16°12613012.35.9
Oct17° / 11812.40115.0
Nov11° / 9515.34.19.92.2
Dec / -2°1202016.39.40.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% 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 67%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13268
23367
33367
43268
53466
63466
73367
83367
93367
103367
113367
123367
133367
143367
153367
163268
173367
183367
193268
203169
213169
223169
233169
243268
253367
263367
273268
283367
293466
303466

Chance of precipitation in September

Any precipitation

Tendō gets around 126 mm of rain over 13 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 44% and peaks near 46% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
146
246
346
446
546
646
746
846
946
1046
1146
1246
1346
1445
1545
1645
1744
1844
1943
2043
2142
2242
2342
2442
2542
2642
2742
2843
2943
3042

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 29% of days. Sticky, muggy-or-worse air turns up on roughly 26% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
11123339151
21123438141
32133437131
42143537120
52153636100
6316363590
7417363490
8518363380
9619363270
10721363060
11822362960
121023352750
131124342640
141325342440
151526332230
161828322030
172029311820
182230291720
192530281520
202831271320
213032251210
223332241010
23353322910
24373321710
25403419610
26423418510
27443417410
28473415400
29493414300
30513313300

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 5:12 AM to 5:38 AM, and sunset from 6:04 PM to 5:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:126:04
212.85:136:03
312.85:146:01
412.75:156:00
512.75:165:58
612.75:175:56
712.65:175:55
812.65:185:53
912.55:195:52
1012.55:205:50
1112.55:215:48
1212.45:225:47
1312.45:235:45
1412.35:245:43
1512.35:255:42
1612.25:265:40
1712.25:265:39
1812.25:275:37
1912.15:285:35
2012.15:295:34
2112.05:305:32
2212.05:315:30
2311.95:325:29
2411.95:335:27
2511.95:345:25
2611.85:355:24
2711.85:365:22
2811.75:365:21
2911.75:375:19
3011.65:385:17

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.51 kWh/m².

For context, solar energy here swings from a low near 1.85 kWh/m² to a high of 5.28 kWh/m² in May across the year — September's 3.51 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.8Moderate
33.8Moderate
43.8Moderate
53.7Moderate
63.7Moderate
73.7Moderate
83.6Moderate
93.6Moderate
103.6Moderate
113.6Moderate
123.5Moderate
133.5Moderate
143.5Moderate
153.5Moderate
163.5Moderate
173.4Moderate
183.4Moderate
193.4Moderate
203.4Moderate
213.4Moderate
223.3Moderate
233.3Moderate
243.3Moderate
253.3Moderate
263.3Moderate
273.2Moderate
283.2Moderate
293.2Moderate
303.2Moderate
Planning a trip in September

Hazard calendar for Tendō

In seasonPeak

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

Tendō 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 Tendō?

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

5.9
Sightseeing
2nd-best month of the year
4.5
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Tendō for sightseeing.

What to pack for Tendō in September

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

In September, Tendō sees daytime highs around 23°C and nights near 16°C. Worth packing: light clothes and rain gear. About 13 days see rain.

light clothesrain gear

UV index in Tendō in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tendō peaks around August 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateAug 15UV 9Dec 22UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun8Very high
Jul8Very high
Aug9Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec2Low

Air quality in Tendō 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 Tendō is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1622 µg/m³Dec 1710 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar21Moderate
Apr22Moderate
May21Moderate
Jun16Moderate
Jul14Moderate
Aug12Moderate
Sep12Good
Oct12Good
Nov11Good
Dec10Good
Location & terrain

Where is Tendō?

Tendō sits at 38.4°N, 140.4°E, 108 m above sea level, in Japan. The nearest listed city is Sagae, 9.0 km away.

Topography around Tendō

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

Within 3 km, the terrain around Tendō has significant variations in elevation — a maximum elevation change of 358 m around an average of 120 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,287 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,078 m.

The land around Tendō is covered by artificial surfaces (40%), cropland (30%) and trees (25%) within 3 km, trees (61%) and cropland (20%) within 16 km, and trees (73%) within 80 km.

3 km
358 m
16 km
1,287 m
80 km
2,078 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Sagae 9.0 km · Yachi 9.0 km · Higashine 10 km · Yamagata 13 km · Murayama 13 km · Kaminoyama 24 km · Obanazawa 28 km · Nagai 40 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 Tendō (38.3536°, 140.3697°, elevation 108 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). 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).