Monthly climate guide
Hamamatsu weather in September
With highs near 26°C (80°F) and lows around 24°C (76°F), September feels warm in Hamamatsu. Rainfall averages about 281 mm (very wet) and the sky is often cloudy. Daytime highs are 2°C cooler than August and 4°C warmer than October.
What stands out in September
- September is Hamamatsu's third warmest month.
- Days and nights are close, only about 2°C apart.
- It's wetter than a typical month in Hamamatsu — roughly 62% more rain than average.
- It's humid — around 79% — so the heat feels heavier.
It's usually the wettest month of the year.
Avg high
26°C
80°F
Avg low
24°C
76°F
Rainfall
281 mm
very wet
Humidity
79%
relative
Sky
66%
cloud · often cloudy
Hamamatsu weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 11°C / 51°F | 7°C / 45°F | 64 mm | 74% | 56% |
| February | 11°C / 52°F | 7°C / 45°F | 89 mm | 73% | 61% |
| March | 14°C / 57°F | 10°C / 49°F | 128 mm | 73% | 56% |
| April | 17°C / 63°F | 13°C / 56°F | 207 mm | 76% | 60% |
| May | 21°C / 69°F | 18°C / 64°F | 179 mm | 80% | 62% |
| June | 23°C / 74°F | 21°C / 70°F | 259 mm | 85% | 78% |
| July | 27°C / 80°F | 25°C / 77°F | 279 mm | 88% | 70% |
| August | 28°C / 83°F | 27°C / 80°F | 163 mm | 85% | 55% |
| September | 26°C / 80°F | 24°C / 76°F | 281 mm | 79% | 66% |
| October | 23°C / 73°F | 20°C / 68°F | 247 mm | 75% | 62% |
| November | 18°C / 65°F | 15°C / 59°F | 104 mm | 72% | 57% |
| December | 13°C / 56°F | 10°C / 50°F | 78 mm | 74% | 58% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A compact umbrella or packable rain jacket
- Water-resistant shoes
- Quick-dry fabrics — it feels stickier than the temperature suggests
Is September a good time to visit Hamamatsu?
Compare the months in the chart above to find your ideal window.
Best time to visit Hamamatsu →Other Japan cities in September
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Hamamatsu weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/japan/hamamatsu/september
<a href="https://weathercompare.eu/weather/japan/hamamatsu/september">Hamamatsu weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/japan/hamamatsu" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Hamamatsu weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/japan/hamamatsu/september">Hamamatsu weather in September</a> – WeatherCompare</p>
Hamamatsu in September: quick answers
Is September a good time to visit Hamamatsu?
September is one of the wetter months in Hamamatsu, with about 281 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Hamamatsu in September?
Average highs are about 26°C (80°F) and average lows about 24°C (76°F), based on 10 years of daily data.
Does it rain a lot in Hamamatsu in September?
Hamamatsu typically gets around 281 mm of rain in September — very wet. It's usually the wettest month of the year.
Figures are long-term averages for the area around Hamamatsu (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.