Japan Yokohama Weather in September — Climate Guide
September in Yokohama is fair
Yokohama Weather in September — Quick Answer
As of 2026- Avg temp
- 27° / 21°
- Rainfall
- 230mm · 11 days
- Crowds
- Moderate
As of 2026, Yokohama in September averages a high of 27°C and low of 21°C with 230mm of rain over about 11 days. Summer's tail + typhoon season — daytime 26-28°C, evening 20°C, humidity 76%. Short-sleeves + light cardigan (evenings + AC), compact umbrella or rain jacket, waterproof walking shoes, SPF 30-50, hat. Late month brings wider daily range — add a long-sleeve.
September is fair for Yokohama.
September is summer's tail and typhoon season's peak. Average 27°C / 21°C, rainfall 230mm — the year's wettest month — and 11 rainy days. One to three typhoons typically track between Japan and the Korean peninsula in September, meaning at least 1-2 days of itinerary disruption is realistic. Direct Haneda flights face occasional cancellations within 24-48 hours of typhoon passage.
September signatures: pre-autumn Sankeien and Yamashita Park scenery, Chinatown autumn desserts (mooncake season around the Mid-Autumn Festival), Marc Is autumn fairs, the Ramen Museum, and hotel pools (open through mid-September). Late September brings cooler evenings + early autumn atmosphere — arguably the most photogenic late-summer window.
Travel score
Summer ends + typhoon peak — September 5-20 is the value window
September Weather at a Glance
September averages 81°F / 27°C highs and 70°F / 21°C lows — late summer transitioning. Tokyo Bay + Pacific exposure makes Yokohama vulnerable to direct typhoon passage. 230mm rainfall is the year's wettest. Late month brings widening daily range and pre-autumn light. Sunrise 5:15 AM, sunset 5:55 PM.
September Travel Advice
Check airline typhoon policies before booking — ANA, JAL, and major international carriers offer free rebooking 24-48 hours before typhoon arrival. Build flexible itineraries: assume 1-2 disruption days. September 5-20 sidesteps the holiday weekend and the back end of typhoon clusters.
Flying In from Overseas
Asian holiday weekend (Mid-Autumn Festival) shifts dates by lunar calendar and bumps flights $50-150 during that window. Otherwise September is global low-season — flights from Seoul (2.5h) $300-550, Singapore $400-700, Sydney $700-1,100, San Francisco $900-1,400, London $900-1,400.
September Pricing Trends
Business hotels $55-90/night (typical week), 4-star Minato Mirai $115-200/night. Mid-Autumn Festival weekend +30-50%. Sankeien $6, ramen museum $2 + $12-16/ramen. USD 1 ≈ JPY 148.
Yokohama September Weather Stats
Avg High
27°C
Avg Low
21°C
Rainy Days
11
230mm total
Sunshine
4h
Daily avg
Humidity
76%
humid
UV Index
7
High
Wind
11 km/h
Gusts 35
Sea Temp
25°C
swimming possible
Crowds
Moderate
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
21 μg/m³
PM10
36 μg/m³
Status
moderate
Feels-Like Temperature & Wind
Feels like
Daytime
29°C
Nighttime
21°C
Humidity and wind affect how the actual temperature feels.
Wind
11 km/h
Max gust 35 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Heat breaks compared to August + hotels normalize
- September 5-20 is the value window
- Autumn desserts + early autumn illumination begin
Cons
- Typhoon season peak — 230mm rainfall, itinerary flexibility required
- Mid-Autumn Festival weekend bumps flights up
- Humidity 76% still sticky
September Events & Festivals
- Typhoon season peak — flexible itineraries essential
- Mid-Autumn Festival weekend (dates vary)
- Nogeyama Zoo autumn matsuri
- Otowa-no-mori autumn illumination opens late month
Yokohama in September — Full Picture
September is summer's tail and typhoon season's peak. Average 27°C / 21°C, rainfall 230mm — the year's wettest month — and 11 rainy days. One to three typhoons typically track between Japan and the Korean peninsula in September, meaning at least 1-2 days of itinerary disruption is realistic. Direct Haneda flights face occasional cancellations within 24-48 hours of typhoon passage.
September signatures: pre-autumn Sankeien and Yamashita Park scenery, Chinatown autumn desserts (mooncake season around the Mid-Autumn Festival), Marc Is autumn fairs, the Ramen Museum, and hotel pools (open through mid-September). Late September brings cooler evenings + early autumn atmosphere — arguably the most photogenic late-summer window.
The trade-off works in travelers' favor: hotels drop 30-40% from the August Obon highs. Flights from Seoul are $300-550. The September 5-20 window combines lower humidity + post-Obon pricing + first hints of autumn. Travel insurance with cancellation coverage + checking your airline's typhoon rebooking policy is essential before booking.
What to Wear & What to Pack
Summer's tail + typhoon season — daytime 26-28°C, evening 20°C, humidity 76%. Short-sleeves + light cardigan (evenings + AC), compact umbrella or rain jacket, waterproof walking shoes, SPF 30-50, hat. Late month brings wider daily range — add a long-sleeve.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
18.7°C
10°C
10.3/mo
Summer (Jun·Jul·Aug)
28°C
22°C
10.3/mo
Autumn (Sep·Oct·Nov)
Current22°C
15.7°C
9.3/mo
Winter (Dec·Jan·Feb)
11°C
3.3°C
5.3/mo
Yokohama Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 10° | 2° | 5d·55mm | 6h | 53% | 2 | Quiet | Low season | |
| 11° | 3° | 6d·60mm | 6h | 55% | 3 | Quiet | Low season | |
| March (Best) | 14° | 5° | 10d·115mm | 6h | 58% | 5 | Very busy | Peak |
| April (Best) | 19° | 10° | 11d·125mm | 6h | 62% | 6 | Very busy | Peak |
| May (Best) | 23° | 15° | 10d·138mm | 6h | 67% | 7 | Busy | Shoulder |
| 25° | 19° | 12d·175mm | 4h | 75% | 8 | Quiet | Low season | |
| 29° | 23° | 11d·155mm | 5h | 78% | 10 | Busy | Peak | |
| 30° | 24° | 8d·140mm | 6h | 75% | 10 | Very busy | Peak | |
| 27° | 21° | 11d·230mm | 4h | 76% | 7 | Moderate | Shoulder | |
| 22° | 16° | 10d·235mm | 5h | 72% | 5 | Busy | Peak | |
| November (Best) | 17° | 10° | 7d·100mm | 5h | 65% | 3 | Very busy | Peak |
| December (Best) | 12° | 5° | 5d·65mm | 6h | 56% | 2 | Very busy | Peak |
View Other Months
Yokohama September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Yokohama?
Yokohama in September is fair. Tourist crowds are moderate and flight/hotel prices are shoulder.
What's the average temperature in Yokohama in September?
Yokohama September averages a high of 27°C and a low of 21°C.
Does it rain much in Yokohama in September?
Yokohama September averages 230mm of rainfall over about 11 rainy days.
What should I wear in Yokohama in September?
Summer's tail + typhoon season — daytime 26-28°C, evening 20°C, humidity 76%. Short-sleeves + light cardigan (evenings + AC), compact umbrella or rain jacket, waterproof walking shoes, SPF 30-50, hat. Late month brings wider daily range — add a long-sleeve.
What time are sunrise and sunset in Yokohama in September?
Yokohama September sunrise is 05:15 and sunset is 17:55, with 12h 40min of daylight.
What's the air quality like in Yokohama in September?
Yokohama September air quality (AQI) averages 45, rated Good. PM2.5 averages 21μg/m³.
What activities are recommended in Yokohama in September?
In September, Yokohama is great for Ramen Museum + Cup Noodles Museum, Chinatown autumn desserts, Sankeien pre-autumn walk.
Is September peak season in Yokohama?
Yokohama September crowds are moderate and prices are shoulder. You can travel relatively comfortably without long queues.
Best Months to Visit Yokohama
View Other Months
Planning a September trip to Yokohama?
You've checked the weather — next come the budget and the route.
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.