Filtered sun, seasonable warmth and mainly dry weather are settling over the Finger Lakes and Central New York on Saturday, giving the region a brief midsummer break before a slower-moving front and deeper humidity push showers and thunderstorms back into the picture late this weekend.
That quieter stretch is not expected to last long. National Weather Service forecasters in Buffalo and Binghamton say the pattern turns more unsettled from Sunday into Monday, when rounds of rain, embedded thunderstorms and locally heavy downpours may develop as a moisture-rich air mass spreads north across upstate New York.
Saturday stays mainly quiet
Saturday begins under high pressure with a mix of clouds and filtered sunshine. Binghamton forecasters expect a thick layer of high clouds to spread from west to east through the day, but they also say enough sunshine should break through to lift temperatures into the low and mid-80s across much of the Finger Lakes and Central New York.
Dew points are expected to hold in the low to mid-60s, which should make the air feel a little more humid than Friday without turning oppressive. Buffalo forecasters also keep most of the region dry through the day, saying the ridge in place should maintain enough control to hold the broader rain shield to the west while the next upper-level trough sharpens across the Great Lakes and Ohio Valley.
There are a couple limited caveats to the quiet forecast. Buffalo does not completely rule out an isolated shower or thunderstorm developing inland from lake-breeze boundaries during the afternoon, while Binghamton notes a few models hint at a stray pop-up shower toward the eastern hills. Even so, both offices keep that risk small enough that the regional message remains the same: Saturday should be mainly dry, with no sign of a widespread washout.
Clouds should increase further tonight as the next system edges closer. The night still looks largely dry for much of the Finger Lakes and Central New York, but forecasters do leave room for a few isolated to scattered showers to begin showing up toward daybreak as the atmosphere starts drawing in more moisture from the south.
Sunday turns more humid and unsettled
The forecast changes more noticeably on Sunday. A warm front is expected to move through during the morning, followed by a deeper southerly flow that will pull richer Gulf moisture into the region ahead of a slow-moving trough and frontal boundary.
That added moisture is one of the clearest signals in the forecast. Binghamton says precipitable water values should climb to about 1.75 inches over the Finger Lakes and Central New York during the day, then rise closer to 1.8 to 2 inches Sunday night. Buffalo points to a similar setup, with near-2-inch moisture values spreading across western and central New York as showers and thunderstorms become more numerous.
Sunday does not look like a day with the same weather from sunrise to sunset. Binghamton expects the morning to stay mostly cloudy and humid, with only a chance of a few showers near the early frontal passage before the better shower and thunderstorm chances arrive later in the day. Buffalo also favors a later increase, with showers and storms becoming more widespread from Saturday night into Sunday as lift strengthens ahead of the front and upper trough.
That timing matters across the region. The western Finger Lakes and areas closer to the Lake Ontario plain may see rain develop sooner than places farther east, while communities deeper into Central New York may hold onto more dry time before the broader showers arrive. But the overall trend is consistent in both forecast discussions: rain chances rise through Sunday, the air mass turns noticeably more humid, and thunderstorms become increasingly likely by late day and Sunday night.
Heavy rain matters more than severe weather
The most consequential part of the Sunday forecast is not a classic organized severe-weather setup. Instead, both forecast offices emphasize the potential for efficient, locally heavy rainfall as storms tap into very high moisture content.
Buffalo notes that the low- and mid-level flow may run nearly parallel to the approaching front and trough, a setup that can allow showers and storms to train over the same locations. Binghamton says warm-cloud depths will increase Sunday night, which would support more efficient rainfall processes. In plain terms, any storm that lingers or repeats over one corridor could drop a quick burst of heavier rain.
That is why the Weather Prediction Center excessive-rain outlook remains part of the discussion. Buffalo cites a marginal risk for the entire region Sunday and Sunday night, while Binghamton says a marginal to slight excessive-rainfall risk remains in place from Sunday afternoon through Monday for most of the area. Neither office is projecting a regionwide flood event at this stage, but both make clear that localized flash flooding cannot be ruled out if the wetter scenario verifies.
The severe-weather signal is much less robust. Buffalo says deep-layer shear may be adequate in parts of western New York, but only weak to modest instability should limit the chance for an organized severe outbreak. Binghamton reaches a similar conclusion, noting that instability currently looks fairly limited over Central New York even as showers and embedded thunderstorms become more numerous. That leaves the forecast centered more on downpours and repeated rain than on a broad damaging-wind threat.
Monday still depends on how fast the front moves
Forecast confidence begins to loosen a bit more on Monday because model guidance continues to trend slower with the main frontal passage. Both Buffalo and Binghamton say showers and thunderstorms may linger longer into the first workday of the week than earlier forecasts suggested.
Binghamton keeps likely rain chances through at least Monday afternoon for much of the forecast area and says the deepest moisture may not begin easing until later in the day from northwest to southeast. That means places closer to Syracuse, Penn Yan and Hornell could be first to see improving conditions if drier air pushes in on schedule, while parts of Central New York and the southern half of the region may stay muggier and wetter longer.
Buffalo likewise says the slower trend has increased confidence that at least some showers and storms will remain in the picture Monday. The office also points to continued uncertainty in how a developing cutoff low evolves nearby, which is one reason forecasters are not ready to promise a clean west-to-east clearing timeline yet.
Temperatures on Sunday and Monday are expected to stay mostly in the mid-70s to low 80s, but humidity will be higher than what the region sees Saturday. Binghamton says dew points should rise into the upper 60s and even the low to mid-70s by Monday, which would make the air feel especially muggy where rain is not falling.
Next week stays warm, with more storm chances
The longer-range outlook does not point to a lasting dry reset once the Sunday-Monday system leaves. Instead, forecasters expect a warm and humid pattern to persist through much of next week, with at least some chance for showers or thunderstorms on most days.
Binghamton says Tuesday may offer a brief drier reprieve if the front slips far enough south Monday night, but confidence in that break is still tied to the exact track of the upper-level low. By Tuesday night and Wednesday, the office expects moisture and instability to increase again, which is why shower chances rise once more in the middle of the week. Buffalo also leaves room for showers and thunderstorms to linger through midweek depending on how the nearby closed low develops.
The most likely broad message for Tuesday through Friday is warmer-than-average August weather with humidity that does not back off much. Highs should return to the 80s, lows should stay in the 60s, and the region may have to work around periodic afternoon or evening showers and storms rather than settling into an extended fair-weather stretch.
Check the latest forecast at the FingerLakes1.com Weather Center.
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