Siena, NY Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Siena Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY |
| Rain | Rain | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers | Mostly Cloudy |
| Hi: 60°FHi: 16°C | Lo: 50°FLo: 10°C | Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C | Hi: 61°FHi: 16°C | Hi: 65°FHi: 18°C Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C Lo: 49°FLo: 9°C | Hi: 65°FHi: 18°C Lo: 49°FLo: 9°C | Hi: 69°FHi: 21°C |
| POP: 100% | POP: 60% | POP: 30% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 830 AM EDT Sun Sep 20 2026 

Siena Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Siena Weather Map
Siena Quick Facts
Siena Forecast Discussion
Meteorlogic Glosserator
Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 144 PM EDT Sun Sep 20 2026
Key Messages
1) Widespread light rain and drizzle taper off this evening, with generally dry conditions and below normal temperatures through midweek.
2) A coastal storm will track near the East Coast late this week, but confidence remains low on whether we will see impacts from this system at this time.
Discussion
...
Areas of light rain and drizzle will gradually taper off from NW to SE later this afternoon and evening, with mostly to partly cloudy skies then lingering through tonight. Where a few ...
Weather World