Climate averages 1991–2020
Karatsu weather
in January.
A cool, moderately wet month: the coolest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cool month in Karatsu: daytime highs average 9.0°C and nights cool to about 4.5°C. By daytime temperature it is the coolest month of the year.
Expect about 76 mm of rain on roughly 12 days, which makes January a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 10 h 12 min on an average January day.
The nearest other city in this atlas is Itoshima (23 km away). In January its highs average 8.3°C, 0.7°C cooler than Karatsu, with 64 mm of rain.
Among the 303 cities listed in Japan, Karatsu ranks joint 42nd of 303 for the warmest January highs and joint 209th of 303 for the driest January (rainfall, lowest first). The mean January high of those 303 cities is 7.0°C; Karatsu is 2.1°C warmer than that mean.
From January to February, average highs rise by 1.2°C to 10.2°C, and monthly rainfall rises from 76 mm to 80 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Itoshima in JanuaryJapan · 23 kmHigh 8.3°C · Low 4.1°C · 64 mm rain
- Maebaru-chūō in JanuaryJapan · 25 kmHigh 8.8°C · Low 4.9°C · 64 mm rain
- Sasebo in JanuaryJapan · 38 kmHigh 9.3°C · Low 5.1°C · 60 mm rain
- Saga in JanuaryJapan · 39 kmHigh 9.1°C · Low 2.9°C · 61 mm rain
- Fukuoka in JanuaryJapan · 45 kmHigh 8.7°C · Low 3.2°C · 63 mm rain
- Kasuga in JanuaryJapan · 47 kmHigh 8.6°C · Low 2.0°C · 63 mm rain
- Tosu in JanuaryJapan · 51 kmHigh 8.9°C · Low 1.6°C · 61 mm rain
- Kurume in JanuaryJapan · 53 kmHigh 8.9°C · Low 1.7°C · 61 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.