Shimoda weather in September

In September, Shimoda sees average daytime highs of 25°C and overnight lows near 22°C, with 240 mm of rain across 15.3 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 23°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 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 Shimoda's 9th-clearest and 8th-windiest month. For the whole year in context, see Shimoda's year-round climate.

Daytime high
25°
3rd warmest
Overnight low
22°
10th coldest
Rainfall
240 mm
15.3 wet days
Daylight
12 h 12 min
5:32 AM – 5:45 PM
Cloud cover
60%
9th clearest
Wind
20 km/h
8th windiest
Solar energy
4.35 kWh/m²
Travel score
5.9
out of 10

Shimoda is city in Shizuoka prefecture, Japan.

Founded
1971

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 23°C by the end.

A typical September day in Shimoda reaches about 25°C in the afternoon and slips back to 22°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 26°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)
12624
22624
32624
42624
52624
62624
72623
82623
92523
102523
112523
122523
132523
142523
152523
162522
172422
182422
192422
202422
212422
222422
232421
242421
252321
262321
272321
282321
292321
302321

Shimoda 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
Jan10° / 1049.50.49.92.3
Feb10° / 1159.40.510.72.4
Mar12° / 19113.90.211.73.2
Apr16° / 13°18212.5012.84.6
May19° / 16°21012.3013.85.7
Jun22° / 20°28915014.35.5
Jul25° / 23°23613.8014.16.1
Aug26° / 24°14613013.36.2
Sep25° / 22°24015.3012.25.9
Oct21° / 18°26213.9011.16.0
Nov17° / 14°16311.6010.25.2
Dec12° / 10°9810.309.73.5

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 14% of September, with mostly cloudy or overcast conditions the remaining 53%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
25050
34951
44951
54852
64951
74852
84852
94852
104753
114753
124753
134753
144753
154753
164753
174654
184555
194555
204555
214456
224555
234555
244555
254456
264456
274555
284555
294555
304555

Chance of precipitation in September

Any precipitation

Shimoda gets around 240 mm of rain over 15.3 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 51% and peaks near 53% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
149
249
350
451
551
652
752
852
953
1053
1153
1253
1353
1452
1552
1652
1752
1852
1952
2052
2151
2251
2351
2450
2550
2650
2750
2850
2950
3050

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 36% of days. Sticky, muggy-or-worse air turns up on roughly 72% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1004215520
2004225618
3005235517
4006245416
5006255415
6007255414
7018265213
8019275211
90111285010
10011229499
11021329488
12021430467
13031531446
14041731435
15151832405
16151932384
17162133363
18172233333
19192433312
201102533282
212112733261
222122833241
232132933211
242143133191
253153233171
263163333150
273173432130
284183532120
294193631100
30420363190

Wind in September

Winds average 20 km/h in September.

Across September, daily wind ranges from about 18 km/h on the calmest days to 22 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1420light breeze
1520light breeze
1620light breeze
1720breezy
1820breezy
1921breezy
2021breezy
2121breezy
2221breezy
2321breezy
2421breezy
2522breezy
2622breezy
2722breezy
2822breezy
2922breezy
3022breezy

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 5:21 AM to 5:43 AM, and sunset from 6:07 PM to 5:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:216:07
212.75:226:05
312.75:236:04
412.75:236:03
512.65:246:01
612.65:256:00
712.55:255:58
812.55:265:57
912.55:275:55
1012.45:285:54
1112.45:285:52
1212.45:295:51
1312.35:305:49
1412.35:315:48
1512.35:315:46
1612.25:325:45
1712.25:335:43
1812.15:345:42
1912.15:345:40
2012.15:355:39
2112.05:365:38
2212.05:375:36
2312.05:375:35
2411.95:385:33
2511.95:395:32
2611.85:405:30
2711.85:405:29
2811.85:415:27
2911.75:425:26
3011.75:435:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.35 kWh/m².

For context, solar energy here swings from a low near 2.47 kWh/m² to a high of 5.58 kWh/m² in May across the year — September's 4.35 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
34.9Bright
44.9Bright
54.8Bright
64.8Bright
74.7Bright
84.7Bright
94.7Bright
104.6Bright
114.6Bright
124.5Bright
134.5Bright
144.4Bright
154.4Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.1Bright
214.1Bright
224.1Bright
234.0Bright
244.0Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.8Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Shimoda

In seasonPeak

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

Shimoda 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 Shimoda?

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

5.9
Sightseeing
4th-best month of the year
5.2
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Shimoda for sightseeing.

What to pack for Shimoda in September

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

In September, Shimoda sees daytime highs around 25°C and nights near 22°C. Pack rain gear. Worth having: light clothes. About 15 days see rain.

rain gearlight clothes

Sea temperature near Shimoda 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 offshore is warmest in August at about 26°C and coldest in February near 16°C.

It's comfortable for a long swim from May 24 to Dec 3 — about 6.4 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan17Cool
Feb16Cool
Mar16Cool
Apr18Cool
May20Cool
Jun22Refreshing
Jul24Warm
Aug26Warm
Sep26Warm
Oct24Refreshing
Nov21Refreshing
Dec19Cool

UV index in Shimoda 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 Shimoda peaks around July 24 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 highExtremeVery highModerateJul 24UV 10Dec 23UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun10Very high
Jul10Extreme
Aug10Extreme
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Shimoda 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 Shimoda is worst in April — around 20 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (December, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1719 µg/m³Dec 168 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb13Moderate
Mar18Moderate
Apr20Moderate
May18Moderate
Jun15Moderate
Jul11Good
Aug10Good
Sep9Good
Oct10Good
Nov9Good
Dec8Good
Location & terrain

Where is Shimoda?

Shimoda sits at 34.7°N, 138.9°E, 11 m above sea level, in Japan. The nearest listed city is Shuzenji, 33 km away.

Topography around Shimoda

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

Within 3 km, the terrain around Shimoda has significant variations in elevation — a maximum elevation change of 330 m around an average of 62 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,060 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,746 m.

The land around Shimoda is covered by trees (66%) and water (22%) within 3 km, water (53%) and trees (45%) within 16 km, and water (75%) and trees (20%) within 80 km.

3 km
330 m
16 km
1,060 m
80 km
3,746 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Shuzenji 33 km · Izu 33 km · Itō 35 km · Izunokuni 40 km · Atami 47 km · Kamizawa 47 km · Numazu 48 km · Fushimi 49 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 Shimoda (34.6765°, 138.9446°, 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).