Climate averages 1991–2020
Karatsu weather
in October.
A warm, wet month: the 6th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a warm month in Karatsu: daytime highs average 22.1°C and nights cool to about 16.7°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 103 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 23 min on an average October day.
The nearest other city in this atlas is Itoshima (23 km away). In October its highs average 21.7°C, about as warm as Karatsu, with 101 mm of rain.
Among the 303 cities listed in Japan, Karatsu ranks joint 27th of 303 for the warmest October highs and joint 24th of 303 for the driest October (rainfall, lowest first). The mean October high of those 303 cities is 20.4°C; Karatsu is 1.8°C warmer than that mean.
From October to November, average highs fall by 5.3°C to 16.8°C, and monthly rainfall falls from 103 mm to 94 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
Karatsu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.0°C4.5°C | 4.5°C | 76 | 11.9 | 10.210 h |
| February | 10.2°C4.6°C | 4.6°C | 80 | 10.5 | 11.011 h |
| March | 13.6°C7.1°C | 7.1°C | 124 | 11.6 | 12.012 h |
| April | 18.4°C11.0°C | 11.0°C | 134 | 11.0 | 13.013 h |
| May | 22.7°C15.6°C | 15.6°C | 143 | 10.3 | 13.914 h |
| June | 25.6°C19.8°C | 19.8°C | 277 | 14.7 | 14.314 h |
| July | 29.1°C24.1°C | 24.1°C | 260 | 15.3 | 14.114 h |
| August | 30.4°C25.1°C | 25.1°C | 162 | 13.7 | 13.413 h |
| September | 27.0°C21.8°C | 21.8°C | 179 | 12.6 | 12.412 h |
| October, selected | 22.1°C16.7°C | 16.7°C | 103 | 8.1 | 11.411 h |
| November | 16.8°C11.5°C | 11.5°C | 94 | 9.3 | 10.510 h |
| December | 11.4°C6.7°C | 6.7°C | 81 | 11.1 | 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
- Itoshima in OctoberJapan · 23 kmHigh 21.7°C · Low 16.6°C · 101 mm rain
- Maebaru-chūō in OctoberJapan · 25 kmHigh 21.6°C · Low 17.0°C · 101 mm rain
- Sasebo in OctoberJapan · 38 kmHigh 22.3°C · Low 17.2°C · 102 mm rain
- Saga in OctoberJapan · 39 kmHigh 22.1°C · Low 14.7°C · 108 mm rain
- Fukuoka in OctoberJapan · 45 kmHigh 22.1°C · Low 15.4°C · 101 mm rain
- Kasuga in OctoberJapan · 47 kmHigh 22.3°C · Low 14.4°C · 101 mm rain
- Tosu in OctoberJapan · 51 kmHigh 22.4°C · Low 13.7°C · 106 mm rain
- Kurume in OctoberJapan · 53 kmHigh 22.4°C · Low 13.6°C · 106 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 Karatsu) is explained once on the Karatsu year overview and on the Sources, method and limits page.