Hagi weather in September

In September, Hagi sees average daytime highs of 27°C and overnight lows near 21°C, with 189 mm of rain across 12.9 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 31% 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 Hagi's 5th-clearest and 10th-windiest month. For the whole year in context, see Hagi's year-round climate.

Daytime high
27°
3rd warmest
Overnight low
21°
10th coldest
Rainfall
189 mm
12.9 wet days
Daylight
12 h 12 min
6:02 AM – 6:15 PM
Cloud cover
61%
5th clearest
Wind
12 km/h
10th windiest
Solar energy
4.25 kWh/m²
Travel score
6.0
out of 10

Hagi is city in Yamaguchi Prefecture, Japan.

Density
64/km²
people per km²
Founded
2005

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 29°C in the first days to 25°C by the end.

A typical September day in Hagi 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 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)
12923
22923
32923
42922
52822
62822
72822
82822
92822
102822
112721
122721
132721
142721
152721
162721
172720
182620
192620
202620
212620
222619
232619
242519
252519
262519
272518
282518
292518
302418

How September really feels in Hagi

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.

Hagi 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 / 9014.13.6101.4
Feb10° / 8512.63.110.71.8
Mar13° / 126130.911.73.4
Apr18° / 10°12111.1012.85.5
May22° / 15°13510.8013.86.5
Jun25° / 19°22414.1014.35.9
Jul29° / 23°26915.6014.14.8
Aug30° / 24°16913.5013.34.4
Sep27° / 21°18912.9012.26.0
Oct22° / 15°1039.3011.16.9
Nov16° / 10°909.9010.25.2
Dec11° / 9113.41.69.72.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 53%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14258
24258
34357
44456
54555
64456
74555
84654
94654
104753
114753
124753
134852
144753
154753
164852
174753
184852
194753
204753
214753
224753
234852
244852
254852
264951
274951
284951
294951
304951

Chance of precipitation in September

Any precipitation

Hagi gets around 189 mm of rain over 12.9 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 42% and peaks near 47% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
146
247
347
446
546
646
746
846
946
1045
1145
1244
1343
1442
1542
1641
1741
1840
1940
2040
2139
2239
2339
2439
2538
2638
2738
2837
2937
3037

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 57% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1011132515
2011232514
3011333484
4021434464
5021634453
6031734433
7041835413
8141935392
9152035372
10162134352
11172234342
12292334321
133102433301
143112432281
154122532261
165142631241
175152730220
186162829210
197172828190
208182927170
219193026160
2210203025150
2311213024130
2412223123120
2513233122110
2614243121100
271525312090
281626311980
291826311870
301927301760

Wind in September

Winds average 12 km/h in September.

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

051015151015202530
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze

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 5:51 AM to 6:13 AM, and sunset from 6:37 PM to 5:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:516:37
212.75:526:35
312.75:536:34
412.65:546:32
512.65:546:31
612.65:556:30
712.55:566:28
812.55:566:27
912.55:576:25
1012.45:586:24
1112.45:596:22
1212.45:596:21
1312.36:006:19
1412.36:016:18
1512.26:026:16
1612.26:026:15
1712.26:036:14
1812.16:046:12
1912.16:056:11
2012.16:056:09
2112.06:066:08
2212.06:076:06
2312.06:076:05
2411.96:086:03
2511.96:096:02
2611.86:106:00
2711.86:105:59
2811.86:115:57
2911.76:125:56
3011.76:135:55

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.25 kWh/m².

For context, solar energy here swings from a low near 2.08 kWh/m² to a high of 5.66 kWh/m² in May across the year — September's 4.25 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.6Bright
34.6Bright
44.6Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.4Bright
104.4Bright
114.4Bright
124.4Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.1Bright
234.1Bright
244.1Bright
254.1Bright
264.0Bright
274.0Bright
284.0Moderate
294.0Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Hagi

In seasonPeak

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

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

Hagi's rainy season runs March–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 Hagi?

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

6.0
Sightseeing
3rd-best month of the year
6.1
Beach & pool
2nd-best month of the year

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

What to pack for Hagi in September

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

In September, Hagi sees daytime highs around 27°C and nights near 21°C. Worth packing: light clothes and rain gear. About 13 days see rain.

light clothesrain gear

Sea temperature near Hagi 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 at the nearest coast (about 25 km away) is warmest in August at about 27°C and coldest in February near 14°C.

It's comfortable for a long swim from Jun 9 to Nov 20 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Cool
Feb14Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul24Warm
Aug27Warm
Sep26Warm
Oct23Refreshing
Nov20Refreshing
Dec18Cool

UV index in Hagi 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 Hagi peaks around June 23 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 highModerateJun 23UV 10Dec 21UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Hagi 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 Hagi is worst in April — around 23 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 1023 µg/m³Oct 1111 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb19Moderate
Mar23Moderate
Apr23Moderate
May20Moderate
Jun16Moderate
Jul13Moderate
Aug15Moderate
Sep11Good
Oct11Good
Nov13Moderate
Dec12Moderate
Location & terrain

Where is Hagi?

Hagi sits at 34.4°N, 131.4°E, 31 m above sea level, in Japan. The nearest listed city is Nagato, 20 km away.

Topography around Hagi

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

Within 3 km, the terrain around Hagi has significant variations in elevation — a maximum elevation change of 442 m around an average of 112 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 779 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,369 m.

The land around Hagi is covered by trees (66%) and artificial surfaces (23%) within 3 km, trees (67%) and water (28%) within 16 km, and water (55%) and trees (40%) within 80 km.

3 km
442 m
16 km
779 m
80 km
1,369 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Nagato 20 km · Yamaguchi 25 km · Mine 30 km · Ogōri-shimogō 33 km · Hōfu 41 km · Sanyōonoda 47 km · Onoda 49 km · Masuda 50 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 Hagi (34.4°, 131.4167°, elevation 31 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).