Mornings sit near the overnight low around 21°C with clear, cooler light — best for outdoor photos before crowds build.
Japan Weather in September
Everything you need to know about Japan weather in September
Updated September 10, 2026
Japan · Japan
Japan Weather in September
September in Japan is hot, humid and energetically busy. Expect daytime highs around 28°C (82°F), mild nights around 21°C, shifting seasonal light, and a calmer pace than peak season Check the full climate tables below for monthly averages and packing cues.
- Avg high / low
- 28°C / 21°C
- 82F / 70F
- Precipitation
- 64mm
- 8 wet days
- Daylight
- 12.5 hrs
- mid-range daylight
Japan average temperatures through the year
SeptemberRest of the year
8°
9°
13°
18°
23°
27°
31°
32°
28°
21°
15°
10°
JAN
6 wet
FEB
7 wet
MAR
9 wet
APR
10 wet
MAY
10 wet
JUN
12 wet
JUL
10 wet
AUG
9 wet
SEP
8 wet
OCT
6 wet
NOV
5 wet
DEC
5 wet
Daytime highs in Celsius with wet days per month for Japan. September sits at 28°C with 8 wet days.
The short answer
September falls in Japan's autumn. Daytime highs average 28°C (82°F) with nights near 21°C (70°F). Precipitation totals about 64mm across roughly 8 wet days. Settling snow is uncommon. Visiting works well if you plan for medium crowds Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
September climate in Japan
Monthly averages for Japan, Japan.
- Day high
- 28°C
- 82°F
- Night low
- 21°C
- 70°F
- Precipitation
- 64mm
- 2.5 in
- Wet days
- 8
- rain or drizzle
- Sunrise
- 5:45am
- mid-September
- Sunset
- 6:15pm
- mid-range daylight
- Daylight
- 12.5 hrs
- 6 hrs sunshine
Averages based on long-run monthly climate normals. Last updated September 10, 2026.
Real weeks swing around the 25°C mean. Early September often sits near 27°C while the final week lands closer to 29°C. Pack a spare layer for that 1° drift rather than dressing only for the monthly average Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
Rain and drizzle usually arrive in pulses across the 8 wet days. Dry stretches between systems feel clearer and colder overnight. Use those gaps for outdoor sightseeing and keep indoor backups for the wetter clusters Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
What is the average temperature in Japan in September?
The average temperature in Japan in September is around 25°C (77°F), combining daytime highs of 28°C (82°F) with night lows of 21°C (70°F). The month warms steadily: the first days average highs near 27°C, while the final week typically tops out around 29°C with nights of 22°C.
Average daily high and low through September. The month warms by roughly 1 degrees start to finish.
How much does it rain in Japan in September?
Japan gets around 64mm (2.5in) of precipitation in September, spread over roughly 8 wet days. Wet spells typically last a day or two and clear to drier stretches in between Check the full climate tables below for monthly averages and packing cues.
48
56
72
80
80
96
80
72
64
48
40
40
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
Average precipitation by month in millimetres. September's 64mm sits near the annual rhythm.
Average precipitation by hour of day in Japan
September precipitation in Japan falls fairly evenly around the clock, with a mild overnight and early-morning peak. There is no predictable afternoon-downpour pattern — check the day's forecast rather than timing outings by the clock Check the full climate tables below for monthly averages and packing cues.
12am6am12pm6pm12am
Relative share of September precipitation by hour of day. The distribution is fairly flat, with a mild overnight peak.
When is sunrise and sunset in Japan in September?
September daylight in Japan averages about 12.5 hours, mid-range daylight. Sunrise drifts from 5:45am to 5:51am across the month, while sunset holds near 6:15pm before edging toward 6:19pm. Plan outdoor sightseeing in the brighter midday window Check the full climate tables below for monthly averages and packing cues.
Sunrise and sunset through September. The shaded band is daylight Check the full climate tables below for monthly averages and packing cues.
How humid is Japan in September?
Relative humidity in Japan in September averages around 72 percent. At 28°C that reads damper than the thermometer suggests. Temperature and wind still drive packing more than humidity alone Check the full climate tables below for monthly averages and packing cues.
55
58
62
65
70
78
80
78
72
65
60
58
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
Average relative humidity by month. September sits near 72%.
What is the weather like in Japan the rest of the year?
Japan moves from cooler months near 8°C highs through a warmer peak near 32°C. The best-weather stretch usually aligns with March and April. September sits in the autumn arc with 28°C highs Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
Average high (coral) and low (navy) by month. The shaded band is the typical daily range; SEP is marked.
Is September a good time to visit Japan?
Yes — if you accept medium crowds. Here is the honest trade-off.
OverallGreat for mild travel
WeatherHot and humid
CrowdsMedium
PricesMid
Budget (per night)$140 to $220
Book ahead3 to 5 weeks
September in Japan is defined by cooling down, fewer crowds and 28°C days. Stays often land in the $140–$220 range with mid season demand. The smartest move is to book about 3–5 weeks ahead and keep outdoor blocks in the brighter midday window Check the full climate tables below for monthly averages and packing cues.
Pros
- 28°C highs suit mild days in Japan
- 6h average sunshine for daytime plans
- Medium crowds shape the September pace
- Mid season rates for stays and flights
Cons
- 8 wet days can pause outdoor sightseeing
- Humidity at 72% can feel heavier than the air temp
- Some attractions keep shorter winter hours
- Daylight near 12.5 hrs shortens evening walks
Travelling to Japan in September?
Book lodgings about 3–5 weeks ahead, then visit the busiest central sights right at opening on a weekday to skip the mid-afternoon crush first-timers always hit Check the full climate tables below for monthly averages and packing cues. Compare months on our Best Time to Visit Japan guide.
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What September actually feels like
September is Japan's autumn in lived terms: cooling down, fewer crowds. Most days feel cold, dry and often clear, with damper grey stretches arriving in bursts rather than settling in for the whole month Check the full climate tables below for monthly averages and packing cues.
The underestimated variable is the day–night temperature swing. It truncates outdoor evenings and pushes dinner earlier. Build one indoor spare block every day Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
Early September often starts near 27°C while the final week trends toward 29°C. That 1° drift is enough to change coat weight mid-trip. Recheck the forecast before packing day seven Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
Afternoons reach 28–29°C before an early sunset near the 12.5-hour daylight limit — plan open-air stops then.
Evenings cool quickly toward 21°C; shift to indoor dining and illuminated streets once the light drops.
September in Japan, week by week
Crowds and prices move more than the thermometer.
September 1–7
27°C (81°F)- Crowds
- Medium
- Prices
- Mid season
- Best for
- Quieter weekday exploring
September 8–14
28°C (82°F)- Crowds
- Medium
- Prices
- Mid season
- Best for
- Balanced weather window
September 15–21
28°C (82°F)- Crowds
- Medium
- Prices
- Mid season
- Best for
- Steady mid-month pace
September 22–30
29°C (84°F)- Crowds
- Medium
- Prices
- Mid season
- Best for
- Late-month flexible plans
Temperatures are Japan monthly averages split across each window. Individual years vary by several degrees.
Japan events in September
The fixtures worth timing your trip around, and how they move the crowds.
Mid-to-late September when equinox holidays align
SEP
Silver Week (Rare long weekend)
A rare multi-day holiday pack spikes short domestic trips.
Timing note
Exact dates shift each year. Check dates for your travel year, or let Holi-AI sequence them into your plan automatically.
What to pack and wear for Japan in September
Light fabric, serious sun care
Pack for Japan in September around the 28°C / 21°C swing. The governing rule is ventilate and block UV. The one item worth buying before you fly is a breathable mid-layer Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
Essential
- Breathable shirts
- Sun hat
- SPF 50+ sunscreen
- Refillable bottle
Smart additions
- Scarf or buff
- Portable charger
- Clear tote for layers
- Lip balm SPF
Leave behind
- Thick parkas
- Wool sweaters
- Snow boots
Top places to visit in Japan in September
Outdoor icons with shade breaks
City centre · Free
Japan landmark walk
Go early on weekdays for quieter photos and softer light.
Add to your planWaterfront · Free
Harbour or river promenade
Golden hour is the calmest window Check the full climate tables below for monthly averages and packing cues.
Add to your planMuseum quarter · Paid
Flagship museum morning
Weekday openings beat weekend queues and wet-day backups.
Add to your planOld town · Free
Historic streets loop
Late morning light helps cold stone feel less harsh.
Add to your planPark · Free
Central green escape
Shade and benches make longer walks realistic Check the full climate tables below for monthly averages and packing cues.
Add to your planCovered market · Free
Indoor food hall backup
Ideal when wet days interrupt outdoor plans Check the full climate tables below for monthly averages and packing cues.
Add to your plan
Top places to stay in September
Base near the sights that matter in September
Best overall
Central core
Walkable to main sights with easier 12.5-hour daylight logistics Check the full climate tables below for monthly averages and packing cues.
Best value
One transit stop out
Lower rates than the core while staying close for medium evenings.
Local feel
Neighbourhood streets
Quieter nights and easier restaurant bookings than the busiest tourist blocks.
Top restaurants to visit in September
Breezy rooms and light seasonal plates
Downtown · Classic
Japan lunch counter
Hearty midday stop when outdoor plans run short on daylight.
Add to your planOld town · Cosy
Neighbourhood bistro
Low light and early dinners match short sunset windows Check the full climate tables below for monthly averages and packing cues.
Add to your planMarket · Casual
Covered market stalls
Fast warm food without a reservation on wet afternoons Check the full climate tables below for monthly averages and packing cues.
Add to your planRiverside · Scenic
Waterfront cafe
Daylight seating works best before the evening chill Check the full climate tables below for monthly averages and packing cues.
Add to your planArts district · Modern
Gallery-side kitchen
Pairs well with museum days when weather turns Check the full climate tables below for monthly averages and packing cues.
Add to your planResidential · Local
Corner noodle or soup spot
Simple, hot bowls that suit cold or humid evenings Check the full climate tables below for monthly averages and packing cues.
Add to your plan
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Japan weather by month
How September compares. Every month links to its full weather guide.
| Month | Avg high | Wet days | Crowds | Cost | Overall | Best for |
|---|---|---|---|---|---|---|
| January | 8°C (46°F) | 6 | Low | Budget | Okay | Cold but dry, fewer tourists |
| February | 9°C (48°F) | 7 | Low | Budget | Okay | Still cold, good for budget travel |
| March | 13°C (55°F) | 9 | Medium | Mid | Great | Mild weather, cherry blossom season |
| April | 18°C (64°F) | 10 | High | Peak | Great | Peak season, book ahead |
| May | 23°C (73°F) | 10 | High | High | Great | Pleasant temperatures, busy |
| June | 27°C (81°F) | 12 | Medium | Mid | Okay | Rainy season begins |
| July | 31°C (88°F) | 10 | High | High | Okay | Hot and humid, festivals |
| August | 32°C (90°F) | 9 | High | High | Okay | Peak summer heat |
| September | 28°C (82°F) | 8 | Medium | Mid | Great | Mild — this guide |
| October | 21°C (70°F) | 6 | High | High | Great | Best weather of the year |
| November | 15°C (59°F) | 5 | High | High | Great | Autumn colours peak |
| December | 10°C (50°F) | 5 | Medium | Mid | Okay | Cold, festive illuminations |
Temperatures shown as Japan monthly averages.
September vs August: September averages 25°C versus 29°C in August — a 4°C cooldown. Crowds shift from High to Medium while pricing moves into mid season. Pick September if you want cooling down, fewer crowds Check the full climate tables below for monthly averages and packing cues.
September vs October: October trends to 18°C, 7°C cooler than September. Expect high crowds and high season rates. Pick October if you prefer best weather of the year Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
Want September sun instead?
Need more sun than Japan offers in September?
- 28°C
Tokyo in September
A change of scene with comparable September weather. Japan vs Tokyo →
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Osaka in September
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Japan in September FAQ
Everything you need to know about Japan weather in September
Daytime highs average 28°C (82°F) and nights fall near 21°C (70°F). The monthly mean sits around 25°C. Expect a 1° swing from early to late September Check the full climate tables below for monthly averages and packing cues Check the full climate tables below for monthly averages and packing cues.
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Combinamos dados climáticos, níveis de movimento, faixas de preço e calendário de eventos para indicar os melhores meses para visitar {city}.
Atualizado em September 10, 2026