Isahaya Climate by Month
Isahaya, Nagasaki, Japan
Hot summers and cool winters, with rain spread through the year.
The climate in Isahaya is one of hot summers and cool winters, with rain spread through the year. Expect highs of 89°F (32°C) in August and 51°F (10°C) in January, with the coldest nights (January) near 36°F (2°C). It gets 74 in (1889 mm) of rain a year, spread across the months.
- Warmest month
- 89°F(32°C)
- Average high, August
- Coldest nights
- 36°F(2°C)
- Average low, January
- Rain per year
- 74 in(1889 mm)
- No clear rainy season
- Humidity
- 72%
- Sunniest: August
Best and worst months in Isahaya
Best for weatherOctober is the best time for weather in Isahaya: highs near 75°F (24°C) and about 3.6 in (92 mm) of rain a month.
Least pleasantJuly is the least pleasant month: it's the wettest, with 13 in (332 mm) of rain.
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in October.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Isahaya weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 51°F(10°C) | 36°F(2°C) | 2.4 in(60 mm) | 73% | 2.2 |
| FebFebruary | 53°F(12°C) | 38°F(3°C) | 3.2 in(82 mm) | 68% | 2.9 |
| MarMarch | 60°F(15°C) | 43°F(6°C) | 4.6 in(118 mm) | 70% | 3.9 |
| AprApril | 68°F(20°C) | 51°F(11°C) | 5.5 in(140 mm) | 68% | 4.6 |
| MayMay | 76°F(24°C) | 60°F(15°C) | 6.2 in(158 mm) | 69% | 5.1 |
| JunJune | 80°F(27°C) | 67°F(20°C) | 14 in(358 mm) | 77% | 4.4 |
| JulJuly | 87°F(31°C) | 75°F(24°C) | 13 in(332 mm) | 77% | 4.8 |
| AugAugust | 89°F(32°C) | 76°F(25°C) | 7.9 in(200 mm) | 76% | 5.1 |
| SepSeptember | 84°F(29°C) | 69°F(21°C) | 7.6 in(193 mm) | 74% | 4.2 |
| OctOctoberBest | 75°F(24°C) | 59°F(15°C) | 3.6 in(92 mm) | 71% | 3.6 |
| NovNovember | 65°F(18°C) | 49°F(9°C) | 3.3 in(85 mm) | 69% | 2.6 |
| DecDecember | 55°F(13°C) | 39°F(4°C) | 2.8 in(71 mm) | 73% | 2.1 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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