Monthly climate guide
Chiba weather in September
With highs near 28°C (82°F) and lows around 21°C (69°F), September feels hot in Chiba. Rainfall averages about 223 mm (very wet) and the sky is often cloudy. Daytime highs are 4°C cooler than August and 6°C warmer than October.
What stands out in September
- Chiba is usually about 2°C warmer than Hakone, 110 km away, in September.
- Seasonally, September counts as early autumn in Chiba.
- It's humid — around 82% — so the heat feels heavier.
- September is Chiba's third warmest month.
Avg high
28°C
82°F
Avg low
21°C
69°F
Rainfall
223 mm
very wet
Humidity
82%
relative
Sky
71%
cloud · often cloudy
Chiba weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 9°C / 48°F | 1°C / 33°F | 65 mm | 74% | 65% |
| February | 10°C / 50°F | 1°C / 35°F | 74 mm | 75% | 73% |
| March | 14°C / 56°F | 4°C / 40°F | 120 mm | 76% | 70% |
| April | 18°C / 65°F | 9°C / 48°F | 137 mm | 76% | 69% |
| May | 23°C / 74°F | 14°C / 58°F | 141 mm | 78% | 69% |
| June | 26°C / 78°F | 18°C / 65°F | 198 mm | 82% | 81% |
| July | 30°C / 85°F | 23°C / 73°F | 158 mm | 83% | 74% |
| August | 31°C / 89°F | 24°C / 75°F | 111 mm | 81% | 60% |
| September | 28°C / 82°F | 21°C / 69°F | 223 mm | 82% | 71% |
| October | 22°C / 72°F | 15°C / 59°F | 233 mm | 81% | 74% |
| November | 17°C / 63°F | 9°C / 48°F | 110 mm | 80% | 72% |
| December | 12°C / 53°F | 3°C / 38°F | 68 mm | 77% | 68% |
What to pack for September
- 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 September a good time to visit Chiba?
Compare the months in the chart above to find your ideal window.
Best time to visit Chiba →Other Japan cities in September
Cite or embed this data
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Chiba weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/japan/chiba/september
<a href="https://weathercompare.eu/weather/japan/chiba/september">Chiba weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/japan/chiba" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Chiba weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/japan/chiba/september">Chiba weather in September</a> – WeatherCompare</p>
Chiba in September: quick answers
Is September a good time to visit Chiba?
September is one of the wetter months in Chiba, with about 223 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Chiba in September?
Average highs are about 28°C (82°F) and average lows about 21°C (69°F), based on 10 years of daily data.
Does it rain a lot in Chiba in September?
Chiba typically gets around 223 mm of rain in September — very wet.
Figures are long-term averages for the area around Chiba (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.