Yokohama weather in September
In September, Yokohama has an average high of 27 °C81 °F and an average low of 19 °C67 °F, with about 215 mm8.5 in of precipitation. It is the 3rd warmest month of the year and ranks 2nd for precipitation.
How September compares with other months
Compared with August, September is 3.8 °C6.8 °F cooler on average and wetter by 60 mm2.4 in. Compared with October, September is 5.9 °C10.7 °F warmer on average and drier by 7 mm0.3 in. Daylight lasts about 12.3 hours around the middle of the month. Average relative humidity is 84% and the average cloud amount 71%.
Is September a good time to visit Yokohama?
September is not among the most comfortable months by our comfort score: it is fairly wet (215 mm8.5 in) and it is humid (84%). The most comfortable months in Yokohama are April and May and November.
What to wear in September
For Yokohama in September, pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
September in nearby places
Other months in Yokohama
- January8 °C47 °F / −1 °C30 °F
- February10 °C50 °F / 0 °C32 °F
- March14 °C57 °F / 3 °C37 °F
- April19 °C66 °F / 8 °C46 °F
- May23 °C74 °F / 13 °C56 °F
- June26 °C79 °F / 18 °C64 °F
- July30 °C86 °F / 22 °C72 °F
- August31 °C88 °F / 23 °C74 °F
- September27 °C81 °F / 19 °C67 °F
- October22 °C71 °F / 13 °C56 °F
- November17 °C62 °F / 7 °C45 °F
- December11 °C52 °F / 1 °C34 °F
Frequently asked questions
How warm is Yokohama in September?
In September the average high in Yokohama is 27 °C (81 °F) and the average low is 19 °C (67 °F).
Does it rain a lot in Yokohama in September?
On average about 215 mm (8.5 in) of precipitation falls in September; it ranks 2nd of the 12 months.
Is September the warmest month in Yokohama?
No. The warmest month in Yokohama is August, with an average high of 31 °C (88 °F). The coldest month is January, with an average low of -1 °C (30 °F).
How long is the day in Yokohama in September?
In the middle of September the day in Yokohama lasts about 12.3 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Yokohama in September?
The average relative humidity in September is about 84%. Combined with warm days, it can feel muggy.
How cloudy is Yokohama in September?
On average about 71% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 233 m, while Yokohama lies at about 21 m. Temperatures on this page were therefore adjusted by +1.4 °C2.5 °F using the standard lapse rate of 6.5 °C per 1,000 m.