Climate averages 1991–2020
Isahaya weather
in February.
A cool, wet month: the 11th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
February is a cool month in Isahaya: daytime highs average 10.2°C and nights cool to about 5.6°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 100 mm of rain on roughly 10 days, which makes February a wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 59 min on an average February day.
The nearest other city in this atlas is Ōmura (12 km away). In February its highs average 10.7°C, about as warm as Isahaya, with 85 mm of rain.
Among the 303 cities listed in Japan, Isahaya ranks joint 33rd of 303 for the warmest February highs and joint 253rd of 303 for the driest February (rainfall, lowest first). The mean February high of those 303 cities is 7.9°C; Isahaya is 2.3°C warmer than that mean.
From February to March, average highs rise by 2.9°C to 13.2°C, and monthly rainfall rises from 100 mm to 149 mm.
The annual picture
February 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, selected | 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 | 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
February in nearby cities
- Ōmura in FebruaryJapan · 12 kmHigh 10.7°C · Low 5.9°C · 85 mm rain
- Nagasaki in FebruaryJapan · 18 kmHigh 10.7°C · Low 6.5°C · 100 mm rain
- Ōmuta in FebruaryJapan · 44 kmHigh 10.6°C · Low 3.8°C · 85 mm rain
- Amakusa in FebruaryJapan · 45 kmHigh 11.5°C · Low 5.6°C · 89 mm rain
- Sasebo in FebruaryJapan · 47 kmHigh 10.5°C · Low 5.3°C · 75 mm rain
- Saga in FebruaryJapan · 50 kmHigh 10.3°C · Low 3.0°C · 79 mm rain
- Kumamoto in FebruaryJapan · 61 kmHigh 10.5°C · Low 3.4°C · 99 mm rain
- Honmachi in FebruaryJapan · 64 kmHigh 11.1°C · Low 3.8°C · 92 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.