Yokohama Weather in September
Japan · Humid Subtropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Yokohama sees average temperatures ranging from a low of 21.8°C (71.2°F) to a high of 27.7°C (81.9°F), with a mean of 24.5°C (76.1°F). Compared to the annual average of 16.1°C (61.0°F), this month is 8.4°C warmer than the yearly norm. Precipitation averages 177.3mm, making it approximately 37.0mm wetter than the monthly average of 140.0mm. The city receives an average of 7.9 hours of sunshine per day during September, with relative humidity averaging 80.9%. Wind speeds reach an average maximum of 24.0 km/h. For travelers, this month offers a temperature experience in Yokohama, with wetter-than-average conditions compared to the rest of the year.
Yokohama's coastal position gives it a slightly cooler climate than inland Tokyo. I've tracked the temperature differences and found the bay breeze provides natural air conditioning on summer afternoons. The city's waterfront parks and Minato Mirai district are best enjoyed in September and October, when the humidity drops and the skies clear. The data supports what locals know: Yokohama's climate is a few degrees more comfortable than Tokyo's year-round.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 27.7°C (81.9°F) | 24.5°C (76.1°F) | 18.0°C (64.4°F) |
| Rainfall | 140.7mm | 177.3mm | 163.1mm |
| Sunshine | 10.6 hrs | 7.9 hrs | 7.2 hrs |
| Humidity | 79.2% | 80.9% | 76.1% |
| Wind | 24.9 km/h | 24.0 km/h | 23.7 km/h |
| Rainy Days | 18.6 | 19.2 | 16.2 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Yokohama in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Yokohama in September?
The average temperature in Yokohama during September ranges from 21.8°C (71.2°F) to 27.7°C (81.9°F), with a mean of 24.5°C (76.1°F).
How much does it rain in Yokohama in September?
Yokohama receives an average of 177.3mm of precipitation in September, spread across approximately 19.2 rainy days.
What should I pack for Yokohama in September?
Based on September weather data, pack layers including light jackets and t-shirts, plus an umbrella. Rain gear is essential — this month averages 177.3mm of precipitation.
Is September a good time to visit Yokohama?
September is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Yokohama
Cities with Similar September Climate (Humid Subtropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 35.44°, 139.64°. Timezone: Asia/Tokyo. Last updated: 2026-07-30.