Climate averages 1991–2020
Isahaya weather
in October.
A mild, wet month: the 5th warmest and the 5th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
October is a mild month in Isahaya: daytime highs average 21.9°C and nights cool to about 17.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 112 mm of rain on roughly 8 days, which makes October a wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 24 min on an average October day.
The nearest other city in this atlas is Ōmura (12 km away). In October its highs average 22.5°C, 0.6°C warmer than Isahaya, with 109 mm of rain.
Among the 303 cities listed in Japan, Isahaya ranks joint 39th of 303 for the warmest October highs and joint 43rd of 303 for the driest October (rainfall, lowest first). The mean October high of those 303 cities is 20.4°C; Isahaya is 1.6°C warmer than that mean.
From October to November, average highs fall by 5.2°C to 16.8°C, and monthly rainfall falls from 112 mm to 106 mm.
The annual picture
October 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
Isahaya climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.3°C5.5°C | 5.5°C | 79 | 10.9 | 10.210 h |
| February | 10.2°C5.6°C | 5.6°C | 100 | 10.2 | 11.011 h |
| March | 13.2°C7.9°C | 7.9°C | 149 | 12.0 | 12.012 h |
| April | 17.4°C11.6°C | 11.6°C | 167 | 11.4 | 13.013 h |
| May | 21.3°C15.8°C | 15.8°C | 197 | 10.8 | 13.814 h |
| June | 24.0°C19.6°C | 19.6°C | 444 | 16.5 | 14.314 h |
| July | 27.5°C23.6°C | 23.6°C | 346 | 16.6 | 14.114 h |
| August | 29.1°C24.8°C | 24.8°C | 185 | 13.7 | 13.413 h |
| September | 26.5°C21.9°C | 21.9°C | 202 | 11.9 | 12.412 h |
| October, selected | 21.9°C17.3°C | 17.3°C | 112 | 7.5 | 11.411 h |
| November | 16.8°C12.4°C | 12.4°C | 106 | 9.1 | 10.511 h |
| December | 11.6°C7.7°C | 7.7°C | 92 | 10.3 | 10.010 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
October in nearby cities
- Ōmura in OctoberJapan · 12 kmHigh 22.5°C · Low 17.8°C · 109 mm rain
- Nagasaki in OctoberJapan · 18 kmHigh 22.3°C · Low 18.3°C · 112 mm rain
- Ōmuta in OctoberJapan · 44 kmHigh 22.4°C · Low 15.5°C · 101 mm rain
- Amakusa in OctoberJapan · 45 kmHigh 23.3°C · Low 17.3°C · 104 mm rain
- Sasebo in OctoberJapan · 47 kmHigh 22.3°C · Low 17.2°C · 102 mm rain
- Saga in OctoberJapan · 50 kmHigh 22.1°C · Low 14.7°C · 108 mm rain
- Kumamoto in OctoberJapan · 61 kmHigh 22.5°C · Low 15.1°C · 98 mm rain
- Honmachi in OctoberJapan · 64 kmHigh 23.0°C · Low 15.8°C · 100 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 Isahaya) is explained once on the Isahaya year overview and on the Sources, method and limits page.
Nagasaki lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.