Variable day to day weather, but mostly staying dry

finger lakes weather forecast tuesday september 16 2025 blue skies tinged with a few thin white clouds above a mixed landscape of ponds and long marsh grasses.
After another day of abundant sunshine and warm temperatures, clouds will increase tomorrow and temperatures will fall Friday. [Photo by Meteorologist Drew Montreuil, Montezuma National Wildlife Refuge]

A Couple Weather Systems

High pressure has another firm grip on our weather and will keep low pressure along the Mid-Atlantic coast from getting too close to our region.

For today, the high pressure system will dominate with mostly sunny skies for much of the day.

Winds will be nearly calm or just light and variable through the morning hours. A northeast wind will develop this afternoon with speeds around 5 mph as the low pressure system attempts to drift northward.

It will be a warm day with many areas around 80 degrees. The valleys of the Southern Tier should be above 80 degrees, while some of the higher elevations will be closer to 75 degrees.

Thin clouds will start to push in from the southeast during the afternoon hours and especially this evening. These clouds will stick around for Wednesday, reducing the sunshine at least somewhat.

Expect periods of filtered sunshine on Wednesday, but also perhaps some periods where it is more cloudy than not. A stray shower may even be possible, mainly over Tioga and Cortland counties.

Temperatures Wednesday will start in the mid 50s. Afternoon highs will be a touch cooler, thanks to the clouds, in the mid 70s. Winds will remain light with speeds near or under 5 mph with varying easterly winds.

The coastal low will dissipate by Thursday, allowing sunshine to return in abundance on Thursday. After morning lows in the mid 50s again, afternoon highs should be back around 80 degrees. Morning winds will be light and variable, followed by a northwest breeze in the afternoon.

A small window for a few showers will be open Friday morning as a strong, but dry cold front moves through. Sunshine will increase for the afternoon.

Winds will turn to the north-northwest with speeds around 10 mph behind the front, holding afternoon highs near or below 70 degrees.

finger lakes weather 7-day forecast tue sep 16 | tues, pm thin clouds near 80 | wed, thin clouds, some sun mid 70 | thur, sun and clouds near 80 | fri, a few am showers, then sun upper 60 | sat, mostly sunny near 70 | sun, sun and clouds upper 70 | mon, a few showers, storms low 80
This graphic represents an average over the entire Finger Lakes region. Localized variations should be expected. Click to enlarge.

Weather This Weekend and Next Week

Skies will clear completely Friday night with winds becoming nearly calm.

With cool air behind the cold front firmly in place, temperatures will drop quite a bit Friday night. By Saturday morning, most areas should be in the lower half of the 40s. The chance for a couple frosty pockets in rural Cortland County will need to be watched.

Clear skies will remain throughout the day on Saturday with light east winds. Afternoon highs will top out around 70 degrees.

The cool air will not linger with increasing south winds Saturday night into Sunday. Wind speeds on Sunday will approach 15 mph with gusts around 25 mph.

This will drive temperatures back toward the upper 70s with a mix of sun and clouds. A stray shower may be possible late in the day and into the nighttime hours, but this remains highly uncertain.

Showers and a few thunderstorms may be possible on Monday, but again, the uncertainty is high. It will be a warm day with highs in the 80s probable.

Temperatures will gradually decrease next week, but how fast and how far is unclear. Rain chances beyond Monday are also too uncertain to draw many conclusions about at this time.

More Information:

» Finger Lakes Weather Radar

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finger lakes weather 7-day forecast tue sep 16 | tues, pm thin clouds near 80 | wed, thin clouds, some sun mid 70 | thur, sun and clouds near 80 | fri, a few am showers, then sun upper 60 | sat, mostly sunny near 70 | sun, sun and clouds upper 70 | mon, a few showers, storms low 80
This graphic represents an average over the entire Finger Lakes region. Localized variations should be expected.

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Follow Meteorologist Drew Montreuil:
Meteorologist Drew Montreuil has been forecasting the weather in the Finger Lakes region since 2006 and has degrees in meteorology from SUNY Oswego (B.S. with Honors) and Cornell (M.S.). Drew and his wife have four young boys. When not working or playing with the boys, he is probably out for a run through the countryside.