Climate averages 1991–2020
Yokohama weather
in September.
A warm, wet month: the 3rd warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Yokohama: daytime highs average 25.0°C and nights cool to about 20.9°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 175 mm of rain on roughly 13 days, which makes September a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 26 min on an average September day.
The nearest other city in this atlas is Kawasaki (11 km away). In September its highs average 25.9°C, 0.8°C warmer than Yokohama, with 175 mm of rain.
Among the 303 cities listed in Japan, Yokohama ranks joint 222nd of 303 for the warmest September highs and joint 95th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Yokohama is 0.6°C cooler than that mean.
From September to October, average highs fall by 4.8°C to 20.2°C, and monthly rainfall rises from 175 mm to 210 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Yokohama climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.6°C2.6°C | 2.6°C | 72 | 6.9 | 10.110 h |
| February | 9.2°C2.7°C | 2.7°C | 71 | 7.9 | 10.911 h |
| March | 12.0°C5.6°C | 5.6°C | 127 | 12.2 | 11.912 h |
| April | 16.2°C10.1°C | 10.1°C | 115 | 11.8 | 13.113 h |
| May | 20.1°C14.9°C | 14.9°C | 128 | 11.1 | 14.014 h |
| June | 22.8°C18.6°C | 18.6°C | 164 | 12.7 | 14.515 h |
| July | 26.3°C22.4°C | 22.4°C | 141 | 12.1 | 14.314 h |
| August | 27.7°C23.8°C | 23.8°C | 102 | 10.6 | 13.513 h |
| September, selected | 25.0°C20.9°C | 20.9°C | 175 | 13.4 | 12.412 h |
| October | 20.2°C15.7°C | 15.7°C | 210 | 12.8 | 11.311 h |
| November | 15.6°C10.4°C | 10.4°C | 97 | 10.0 | 10.310 h |
| December | 11.0°C5.4°C | 5.4°C | 63 | 7.4 | 9.810 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Kawasaki in SeptemberJapan · 11 kmHigh 25.9°C · Low 20.9°C · 175 mm rain
- Ōta in SeptemberJapan · 15 kmHigh 25.9°C · Low 20.6°C · 175 mm rain
- Yokosuka in SeptemberJapan · 17 kmHigh 25.1°C · Low 21.7°C · 185 mm rain
- Fujisawa in SeptemberJapan · 18 kmHigh 24.9°C · Low 21.1°C · 208 mm rain
- Minamirinkan in SeptemberJapan · 20 kmHigh 24.8°C · Low 19.5°C · 193 mm rain
- Machida in SeptemberJapan · 22 kmHigh 24.5°C · Low 19.5°C · 193 mm rain
- Komae in SeptemberJapan · 23 kmHigh 25.5°C · Low 20.2°C · 204 mm rain
- Chigasaki in SeptemberJapan · 25 kmHigh 24.9°C · Low 20.9°C · 208 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Yokohama) is explained once on the Yokohama year overview and on the Sources, method and limits page.
Kawasaki and Ōta lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.