The Siena long range forecast shows a slight warming trend, with temperatures gently rising above the seasonal average, 2.8 °F comparing to the historical average.
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Siena 
Long Range Weather Forecast
The Siena long range forecast shows a slight warming trend, with temperatures gently rising above the seasonal average, 2.8 °F comparing to the historical average.
Check out our estimated 30 days weather forecast for Siena, this data is based on the average weather in Siena in the last few years.
For a more accurate and detailed forecast, check out the 14 day weather for Siena next to the desired date.
