Weather radar Siena
Real-time precipitation radar · Toskana · Italy
Siena climate table – average temperature, precipitation & sunshine hours
The climate table for Siena shows long-term monthly averages (2000–2023): average high and average low temperature in °C, monthly precipitation (mm), rainy days and sunshine hours per month. Data source: ERA5 reanalysis (ECMWF) via the WDTEC Climate Archive.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 10° | 12.5° | 14.7° | 17.3° | 21.7° | 28.2° | 31.2° | 30.9° | 25.6° | 20.9° | 14.6° | 11° |
| Avg low (°C) | 2.8° | 3.7° | 4.9° | 6.7° | 11.2° | 16.3° | 18.7° | 18.5° | 14.8° | 11.6° | 6.6° | 3.8° |
| Precipitation (mm) | 62 | 72 | 71 | 70 | 89 | 35 | 27 | 53 | 110 | 91 | 98 | 95 |
| Rainy days | 9 | 8 | 9 | 11 | 13 | 6 | 5 | 8 | 10 | 8 | 12 | 11 |
| Sunshine hours | 191 | 196 | 288 | 324 | 364 | 398 | 413 | 382 | 302 | 255 | 197 | 171 |
| Humidity | 81% | 78% | 72% | 71% | 74% | 68% | 63% | 64% | 72% | 78% | 82% | 86% |
Best time to visit Siena
The best time to visit Siena is typically July. In this month the average high is 31.2°C, precipitation is 27 mm and sunshine duration is 413 hours. The annual average high is 19.9°C, total annual precipitation is 873 mm (110 rainy days/year) and annual sunshine is 3481 hours.
Frequently asked questions about the weather in Siena
How up to date is the weather radar for Siena?
The weather radar for Siena is updated every 5 minutes with new radar data from the OPERA composite radar. A 2-hour forecast animation is also available. Rainfall probability, wind gusts and UV index are available up to 14 days in advance.
What weather data is available for Siena?
Besides the rain radar, RadarWeather provides for Siena: rainfall probability, thunderstorm warning (CAPE index), wind gusts, UV index, air pressure, humidity, dew point, sunshine hours, snow line and a 14-day forecast based on ICON-D2, ECMWF IFS and GFS.
When are thunderstorms expected in Siena?
The thunderstorm potential for Siena is calculated from the CAPE index and lightning potential. Active storm cells and severe weather warnings are visible on the radar map in real time. Thunderstorm warnings are issued automatically as soon as storm cells are detected near Siena.
What is the climate like in Siena?
Siena has an annual average high of 19.9°C. The warmest month is July (avg high 31.2°C), the coldest January (avg low 2.8°C). The wettest month is September with 110 mm, the driest July with 27 mm. Total annual precipitation is 873 mm (110 rainy days). Annual sunshine is 3481 hours.