Climate averages 1991–2020
Honmachi weather
in September.
A warm, wet month: the 3rd warmest and the joint 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Honmachi: daytime highs average 27.9°C and nights cool to about 21.5°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 174 mm of rain on roughly 13 days, which makes September a wet month (the joint 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 24 min on an average September day.
The nearest other city in this atlas is Kumamoto (35 km away). In September its highs average 27.5°C, about as warm as Honmachi, with 156 mm of rain.
Among the 303 cities listed in Japan, Honmachi ranks joint 8th of 303 for the warmest September highs and joint 89th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Honmachi is 2.3°C warmer than that mean.
From September to October, average highs fall by 4.9°C to 23.0°C, and monthly rainfall falls from 174 mm to 100 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
Honmachi climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.6°C3.2°C | 3.2°C | 73 | 9.4 | 10.310 h |
| February | 11.1°C3.8°C | 3.8°C | 92 | 10.0 | 11.011 h |
| March | 14.6°C6.9°C | 6.9°C | 133 | 12.4 | 12.012 h |
| April | 19.5°C11.4°C | 11.4°C | 151 | 11.8 | 13.013 h |
| May | 23.8°C16.1°C | 16.1°C | 174 | 11.8 | 13.814 h |
| June | 26.2°C20.2°C | 20.2°C | 428 | 18.3 | 14.214 h |
| July | 29.5°C23.9°C | 23.9°C | 347 | 18.2 | 14.114 h |
| August | 30.8°C24.6°C | 24.6°C | 162 | 16.1 | 13.313 h |
| September, selected | 27.9°C21.5°C | 21.5°C | 174 | 13.2 | 12.412 h |
| October | 23.0°C15.8°C | 15.8°C | 100 | 8.2 | 11.411 h |
| November | 17.4°C10.3°C | 10.3°C | 96 | 8.8 | 10.511 h |
| December | 11.8°C5.1°C | 5.1°C | 83 | 9.0 | 10.110 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
- Kumamoto in SeptemberJapan · 35 kmHigh 27.5°C · Low 20.8°C · 156 mm rain
- Amakusa in SeptemberJapan · 38 kmHigh 28.1°C · Low 22.1°C · 197 mm rain
- Ōmuta in SeptemberJapan · 60 kmHigh 27.3°C · Low 21.0°C · 165 mm rain
- Isahaya in SeptemberJapan · 64 kmHigh 26.5°C · Low 21.9°C · 202 mm rain
- Nagasaki in SeptemberJapan · 72 kmHigh 26.7°C · Low 22.8°C · 202 mm rain
- Ōmura in SeptemberJapan · 76 kmHigh 27.2°C · Low 22.5°C · 188 mm rain
- Aira in SeptemberJapan · 81 kmHigh 28.0°C · Low 21.5°C · 197 mm rain
- Sendai, Japan in SeptemberJapan · 82 kmHigh 27.9°C · Low 23.1°C · 198 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 Honmachi) is explained once on the Honmachi year overview and on the Sources, method and limits page.