Gero weather in September

In September, Gero sees average daytime highs of 24°C and overnight lows near 16°C, with 248 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 26°C in the first days to 22°C by the end. The sky is clear or mostly clear about 25% of the time in September, and the air most often feels humid.

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 Gero's 8th-clearest and 9th-windiest month. For the whole year in context, see Gero's year-round climate.

Daytime high
24°
3rd warmest
Overnight low
16°
10th coldest
Rainfall
248 mm
14.8 wet days
Daylight
12 h 12 min
5:39 AM – 5:52 PM
Cloud cover
65%
8th clearest
Wind
6 km/h
9th windiest
Solar energy
4.01 kWh/m²
Travel score
5.9
out of 10

Gero is city in Gifu prefecture, Japan.

Density
41/km²
people per km²
Founded
2004

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 26°C in the first days to 22°C by the end.

A typical September day in Gero reaches about 24°C in the afternoon and slips back to 16°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 20°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
22618
32618
42618
52618
62518
72518
82517
92517
102517
112517
122517
132417
142416
152416
162416
172416
182416
192315
202315
212315
222315
232315
242214
252214
262214
272214
282214
292213
302113

How September really feels in Gero

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.

Gero 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 / -5°9712.911.79.80.0
Feb / -4°101118.110.60.1
Mar / -1°17313.45.511.71.5
Apr15° / 19013.3112.94.0
May19° / 10°20413.8013.95.6
Jun23° / 15°26917.2014.45.2
Jul26° / 19°34921014.24.8
Aug27° / 20°20418.4013.45.2
Sep24° / 16°24814.8012.25.9
Oct18° / 10°19812.4011.15.6
Nov12° / 134111.110.13.2
Dec / -2°10613.58.29.60.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% 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 59%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14159
24159
34060
44060
54159
64159
74159
84159
94258
104159
114159
124159
134159
144159
154159
164060
174159
184060
194060
204060
214060
224060
234159
244060
254060
264060
274060
284159
294258
304258

Chance of precipitation in September

Any precipitation

Gero gets around 248 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 57% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
157
256
356
456
555
655
754
854
953
1053
1153
1252
1351
1451
1550
1649
1749
1848
1948
2048
2147
2247
2346
2446
2546
2646
2746
2846
2946
3046

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 32% of days. Sticky, muggy-or-worse air turns up on roughly 22% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
131433473
231435462
341536442
441637422
551637402
651738382
761839351
871939331
982040311
1092140291
11102240271
12122339261
13132439241
14152538221
15172637200
16192736180
17212834170
18232833150
19262932140
20283030120
21303029110
22333027100
2335312590
2437312480
2539312270
2641322160
2743321950
2845321840
2947321740
3049321630

Wind in September

Winds average 6 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:27 AM to 5:50 AM, and sunset from 6:15 PM to 5:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:276:15
212.85:286:13
312.75:286:12
412.75:296:10
512.65:306:09
612.65:316:07
712.65:326:06
812.55:326:04
912.55:336:03
1012.55:346:01
1112.45:356:00
1212.45:365:58
1312.35:365:57
1412.35:375:55
1512.35:385:54
1612.25:395:52
1712.25:395:51
1812.15:405:49
1912.15:415:47
2012.15:425:46
2112.05:435:44
2212.05:435:43
2312.05:445:41
2411.95:455:40
2511.95:465:38
2611.85:475:37
2711.85:475:35
2811.85:485:34
2911.75:495:32
3011.75:505:31

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.01 kWh/m².

For context, solar energy here swings from a low near 2.31 kWh/m² to a high of 5.43 kWh/m² in May across the year — September's 4.01 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.2Bright
84.2Bright
94.2Bright
104.1Bright
114.1Bright
124.1Bright
134.0Bright
144.0Bright
154.0Bright
164.0Moderate
174.0Moderate
183.9Moderate
193.9Moderate
203.9Moderate
213.9Moderate
223.8Moderate
233.8Moderate
243.8Moderate
253.8Moderate
263.7Moderate
273.7Moderate
283.7Moderate
293.7Moderate
303.6Moderate
Planning a trip in September

Is September a good time to visit Gero?

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

5.9
Sightseeing
1st-best month of the year
4.8
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Gero for sightseeing.

What to pack for Gero in September

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

In September, Gero sees daytime highs around 24°C and nights near 16°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

UV index in Gero 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 Gero peaks around July 14 at about 10 (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 — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highModerateJul 14UV 10Jan 1UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Gero 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 Gero is worst in April — around 19 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1719 µg/m³Dec 1510 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar18Moderate
Apr19Moderate
May18Moderate
Jun16Moderate
Jul13Moderate
Aug12Good
Sep11Good
Oct11Good
Nov10Good
Dec10Good
Location & terrain

Where is Gero?

Gero sits at 35.8°N, 137.2°E, 781 m above sea level, in Japan. The nearest listed city is Gujō, 26 km away.

Topography around Gero

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

Within 3 km, the terrain around Gero has large variations in elevation — a maximum elevation change of 771 m around an average of 639 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,745 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,123 m.

The land around Gero is covered by trees (90%) within 3 km, trees (96%) within 16 km, and trees (87%) within 80 km.

3 km
771 m
16 km
1,745 m
80 km
3,123 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Gujō 26 km · Takayama 37 km · Minokamo 40 km · Mino 41 km · Ena 42 km · Nakatsugawa 43 km · Mitake 44 km · Sekimachi 45 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 Gero (35.8°, 137.2333°, elevation 781 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. 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).