IT Italy · Siena
Tuscany
weather by month.
Historical station evidence for choosing when to travel—not a forecast, vineyard measurement or guarantee for a particular visit.
01 1991–2020 normals
Twelve months, one qualified station.
The highlighted rows are Follow The Vines’ editorial travel window, not a conclusion produced by the weather data.
| Month | Mean high | Mean low | Rain | Wet days | Usable years |
|---|---|---|---|---|---|
| January | 12.8°C | 2.8°C | 40 mm | 5.1 | 11 |
| February | 13.8°C | 2.2°C | 43 mm | 5 | 12 |
| March | 16.6°C | 4.7°C | 41 mm | 5.6 | 25 |
| April | 19.7°C | 7.1°C | 38 mm | 5.5 | 25 |
| MayEditorial window | 23.9°C | 11.1°C | 32 mm | 4.3 | 25 |
| JuneEditorial window | 28.5°C | 15°C | 17 mm | 2.1 | 25 |
| July | 31.5°C | 17.8°C | 10 mm | 1 | 25 |
| August | 31.9°C | 18.4°C | 19 mm | 1.6 | 25 |
| SeptemberEditorial window | 27.4°C | 15.1°C | 66 mm | 3.9 | 25 |
| OctoberEditorial window | 22.7°C | 11.7°C | 49 mm | 5.2 | 23 |
| November | 17.4°C | 7.6°C | 129 mm | 8.3 | 14 |
| December | 13.5°C | 3.9°C | 76 mm | 6.7 | 11 |
A wet day has at least 1 mm of precipitation in the underlying monthly projection. Means smooth variation between years and within a month.
02 Evidence passport
What this page can—and cannot—say.
- Evidence found
- All 12 monthly normals from NOAA station ITM00016206, with at least 11 usable 1991–2020 years in every month.
- Source coverage
- GROSSETO is 65.5 km from the fixed Siena anchor and differs by 317 m in elevation. Evidence grade: limited.
- What this means
- The table is suitable for comparing broad monthly travel patterns at this regional base.
- What this does not mean
- It does not describe every vineyard, forecast your dates, measure heat stress or guarantee safe and comfortable travel.
— Turn evidence into a trip
Keep the weather in its lane.
Use the normals to choose a month, then use the editorial guide to shape the visit. Check an official forecast close to departure.
BottlePicker is a related 37X service and may earn commission from retailer links. That does not affect Follow The Vines’ climate filters or region order.
Sources & method
NOAA GHCN-Daily provides station observations; GeoNames supplies the fixed regional anchor. The approved build turns the raw R2 holdings into this small, dated projection and deploys no raw archive.
Projection generated 2026-08-25. Publication rule: at least 10 usable years per month, within 100 km and 350 m elevation difference.