Monthly climate guide
Grosseto weather in September
Expect hot weather in Grosseto in September: afternoons reach about 27°C (81°F), while nights drop to around 15°C (59°F). Around 58 mm of rain falls over the month (some rain), and skies are a mix of sun and cloud. Daytime highs are 5°C cooler than August and 5°C warmer than October.
What stands out in September
- Temperatures are falling — expect highs around 5°C lower by October.
- Grosseto is usually about 2°C warmer than Cortona, 90 km away, in September.
- Expect a big gap between day and night — about 12°C.
- September brings early autumn to Grosseto.
Avg high
27°C
81°F
Avg low
15°C
59°F
Rainfall
58 mm
some rain
Humidity
67%
relative
Sky
44%
cloud · a mix of sun and cloud
Grosseto weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 10°C / 51°F | 2°C / 36°F | 52 mm | 86% | 68% |
| February | 11°C / 53°F | 3°C / 37°F | 68 mm | 83% | 65% |
| March | 15°C / 59°F | 5°C / 40°F | 68 mm | 78% | 58% |
| April | 19°C / 66°F | 8°C / 46°F | 48 mm | 73% | 56% |
| May | 23°C / 73°F | 11°C / 52°F | 56 mm | 70% | 54% |
| June | 28°C / 83°F | 16°C / 60°F | 32 mm | 63% | 35% |
| July | 32°C / 89°F | 19°C / 65°F | 35 mm | 58% | 24% |
| August | 32°C / 90°F | 19°C / 66°F | 28 mm | 57% | 23% |
| September | 27°C / 81°F | 15°C / 59°F | 58 mm | 67% | 44% |
| October | 22°C / 71°F | 11°C / 52°F | 80 mm | 77% | 54% |
| November | 16°C / 60°F | 8°C / 46°F | 104 mm | 85% | 65% |
| December | 12°C / 53°F | 4°C / 38°F | 58 mm | 87% | 63% |
What to pack for September
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- An extra layer — evenings are noticeably cooler than afternoons
- A small travel umbrella, just in case
Is September a good time to visit Grosseto?
Compare the months in the chart above to find your ideal window.
Best time to visit Grosseto →Other Italy cities in September
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Grosseto weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/italy/grosseto/september
<a href="https://weathercompare.eu/weather/italy/grosseto/september">Grosseto weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/italy/grosseto" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Grosseto weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/italy/grosseto/september">Grosseto weather in September</a> – WeatherCompare</p>
Grosseto in September: quick answers
Is September a good time to visit Grosseto?
Yes. September is one of the best months for Grosseto, with highs around 27°C and about 58 mm of rain.
How warm is Grosseto in September?
Average highs are about 27°C (81°F) and average lows about 15°C (59°F), based on 10 years of daily data.
Does it rain a lot in Grosseto in September?
Grosseto typically gets around 58 mm of rain in September — some rain.
Figures are long-term averages for the area around Grosseto (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.