Monthly climate guide
Nagasaki weather in August
Expect hot weather in Nagasaki in August: afternoons reach about 31°C (88°F), while nights drop to around 24°C (76°F). Around 252 mm of rain falls over the month (very wet), and skies are often cloudy. Daytime highs are 2°C warmer than July and 4°C warmer than September.
What stands out in August
- It cools down fast from here: September is about 4°C cooler.
- Nights stay warm, rarely below 24°C — air-conditioning helps.
- Humidity near 83% makes 31°C feel stickier than it sounds.
- Just 350 km apart, but Nagasaki runs about 2°C warmer than Kochi this month.
August is typically Nagasaki's warmest month.
Avg high
31°C
88°F
Avg low
24°C
76°F
Rainfall
252 mm
very wet
Humidity
83%
relative
Sky
59%
cloud · often cloudy
Nagasaki weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 9°C / 49°F | 3°C / 37°F | 66 mm | 78% | 84% |
| February | 11°C / 51°F | 3°C / 38°F | 99 mm | 78% | 79% |
| March | 14°C / 58°F | 6°C / 43°F | 124 mm | 77% | 73% |
| April | 19°C / 66°F | 10°C / 50°F | 162 mm | 78% | 69% |
| May | 24°C / 74°F | 15°C / 58°F | 164 mm | 79% | 68% |
| June | 26°C / 79°F | 19°C / 66°F | 378 mm | 85% | 82% |
| July | 30°C / 85°F | 23°C / 74°F | 370 mm | 86% | 69% |
| August | 31°C / 88°F | 24°C / 76°F | 252 mm | 83% | 59% |
| September | 27°C / 81°F | 20°C / 69°F | 227 mm | 84% | 68% |
| October | 22°C / 72°F | 15°C / 59°F | 133 mm | 81% | 60% |
| November | 17°C / 63°F | 10°C / 51°F | 105 mm | 80% | 71% |
| December | 11°C / 52°F | 5°C / 41°F | 90 mm | 79% | 84% |
What to pack for August
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- A compact umbrella or packable rain jacket
- Water-resistant shoes
- Quick-dry fabrics — it feels stickier than the temperature suggests
Is August a good time to visit Nagasaki?
Compare the months in the chart above to find your ideal window.
Best time to visit Nagasaki →Other Japan cities in August
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Nagasaki weather in August. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/japan/nagasaki/august
<a href="https://weathercompare.eu/weather/japan/nagasaki/august">Nagasaki weather in August</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/japan/nagasaki" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Nagasaki weather in August"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/japan/nagasaki/august">Nagasaki weather in August</a> – WeatherCompare</p>
Nagasaki in August: quick answers
Is August a good time to visit Nagasaki?
It can be, if you like heat: August highs in Nagasaki are around 31°C. Good for the beach; plan sightseeing for early morning and evening.
How warm is Nagasaki in August?
Average highs are about 31°C (88°F) and average lows about 24°C (76°F), based on 10 years of daily data.
Does it rain a lot in Nagasaki in August?
Nagasaki typically gets around 252 mm of rain in August — very wet.
Figures are long-term averages for the area around Nagasaki (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.