The Finger Lakes and Central New York are heading into a more unsettled stretch beginning today, with scattered afternoon thunderstorms giving way to a busier pattern of repeated showers and storms from Monday through at least the middle of the week.
National Weather Service forecast discussions from Buffalo and Binghamton keep the overall severe-weather threat limited for now, but both offices point to increasing humidity, several rounds of rain and a growing chance for locally heavy downpours as a trough settles over the Northeast. Tuesday still looks like the period most likely to bring the widest coverage of wet weather, while the second half of the week remains less certain.
No watches, warnings or advisories were posted for New York in either forecast area early Sunday. The clearer signal in the forecast is not a single high-impact event, but a step-by-step change from a relatively comfortable late-July weekend into a more changeable pattern in which some communities pick up repeated rain while others spend long stretches dry between storms.
Sunday turns more active
Sunday begins from a fairly quiet place across much of the region, but it is no longer the kind of day that looks uniformly dry from start to finish. Buffalo forecasters expect a few showers and thunderstorms to develop inland from the lakes this afternoon and early evening, while Binghamton’s office says weak disturbances moving through the broader upper-level trough should be enough to support isolated to scattered showers with a few afternoon thunderstorms across Central New York and nearby parts of the Southern Tier.
That keeps the highest confidence on a mixed day rather than an all-day washout. Many communities across the Finger Lakes should still see dry hours and some breaks of sun, but the atmosphere is expected to become active enough for brief interruptions to outdoor plans, especially after midday as lake-breeze boundaries, terrain effects and daytime heating begin to work together.
Temperatures are still expected to reach the 80s, and the air mass should remain seasonably warm rather than oppressive. Binghamton said dew points should stay mostly in the 50s to low 60s, which supports a more comfortable feel than a truly muggy midsummer setup, though the humidity should edge higher than it was at the start of the weekend.
The regional differences are subtle but real. Buffalo’s discussion points to the better chance for a late-day cluster near the Niagara Frontier and western New York, while Binghamton added late-day rain chances farther southeast over the Catskills. For the core of the Finger Lakes and Central New York, that leaves a forecast in which scattered development is more likely than a solid band of rain moving cleanly across the map.
Fog and smoke stay in the background
The quieter hours late tonight into early Monday may bring another round of patchy fog, especially in the usual valley locations south of the Thruway and in the more sheltered parts of the Southern Tier. Both forecast offices continue to flag that possibility, and it is one of the few recurring overnight features in an otherwise summerlike pattern built around daytime storm chances.
Binghamton’s office also noted that elevated wildfire smoke should drift over the region today and especially Monday, but it is expected to stay high enough in the atmosphere to have little or no effect on surface air quality. That keeps smoke from becoming the central weather story, though it may still contribute to a somewhat hazier sky at times.
Monday builds toward a wetter pattern
Monday is expected to bring another round of scattered showers and thunderstorms, with Buffalo forecasters putting the better daytime storm chances across central and eastern parts of their forecast area and Binghamton trimming back some of the highest rain chances farther southeast where guidance may have been too aggressive. Even with those adjustments, both discussions describe an atmosphere that is gradually becoming more humid and more supportive of repeated rounds of convection.
This is where the forecast begins to shift from isolated, uneven summer pop-ups toward something more organized on a regional scale. Buffalo’s office says an initial shortwave crossing the area Monday afternoon should increase the likelihood of showers and scattered storms inland from the lakes, especially across central and eastern zones. The same discussion also notes that a relative lull may hold northeast of Lake Erie, where a stabilizing lake influence could keep storm coverage lower for a time.
The severe signal Monday remains fairly muted. Buffalo said weak low- and mid-level flow should keep overall shear limited, which argues against a broad organized severe threat, though a couple of stronger storms cannot be ruled out in the western Southern Tier where shear is somewhat better. Binghamton likewise describes storms as non-severe and short-lived in most cases, while still allowing for gusty winds or even small hail in the stronger cells that manage to develop during the afternoon.
The bigger concern is rain efficiency rather than storm structure. With moisture increasing and winds aloft staying weak, both offices point toward the possibility of heavier downpours in the stronger storms, even if many areas remain rain-free for long stretches between them.
Tuesday and Wednesday look busiest
The steadiest forecast signal in the entire period still centers on Tuesday into Wednesday, when another, stronger disturbance and a developing low pressure system are expected to bring more widespread showers and thunderstorms into the Finger Lakes and Central New York. That broader setup appears likely to produce the highest overall rain coverage of the week, even though the exact track and timing of the system remain unsettled.
Buffalo’s office expects coverage to increase Monday night, mainly later at night, and continue through Tuesday as that stronger wave drops southeast across the Great Lakes. Binghamton’s discussion reaches a similar conclusion, saying the next chance for more widespread rain arrives Tuesday through at least Wednesday as the low develops and crosses somewhere near the region. The main forecast disagreement is not whether the weather turns wetter, but how quickly the low organizes and whether it tracks farther north through the Great Lakes or farther south along the coast.
That uncertainty matters because it could change how unstable the atmosphere becomes Tuesday afternoon. If rain arrives later and the low tracks farther north, Binghamton says stronger southerly flow could allow warmer air and more instability to build before storms fill in. If the lower, wetter solution wins out, more of the period would lean toward steadier showers with fewer opportunities for stronger thunderstorm development. Even in the less favorable outcome, forecasters still expect a wetter day than the region has seen for most of the past several days.
Neither forecast office is signaling a high-end severe setup at this point. Shear is still expected to stay relatively weak, which limits the chance for a more organized severe-weather event. But localized heavier downpours remain on the table, and Binghamton said rainfall amounts of 1.5 to 2 inches are possible in spots from Tuesday into Wednesday, with a marginal excessive-rainfall risk maintained over the region as the system passes through. At the same time, the office noted that several dry days have left soils drier than normal, which should help reduce broader flooding concerns unless heavier rain repeatedly tracks over the same area.
Wednesday may end up as more of a transition day than a clean shutdown. Buffalo continues to carry scattered showers and a few thunderstorms with daytime heating behind the Tuesday system, while Binghamton’s forecast also keeps the low close enough to sustain additional rain chances. That suggests a cooler, cloudier and more variable day rather than an immediate return to summer sunshine.
Late week may dry out, but confidence drops
After midweek, the forecast becomes less settled from a confidence standpoint even as the general weather may begin improving. Buffalo’s discussion trends the pattern drier through the end of the work week as the upper trough weakens and surface high pressure starts to settle back into the Great Lakes. Binghamton is less ready to declare the system gone, noting that one set of guidance still keeps spotty showers around from Thursday into Saturday if the low lingers over the Northeast.
That leaves the late-week outlook with a split message: better odds of improvement than renewed deterioration, but not enough agreement yet to promise a clean, fully dry stretch for every part of the region. If the drier scenario wins out, the Finger Lakes and Central New York would turn quieter again with fewer showers and somewhat more comfortable conditions. If the slower scenario holds, the back half of the week would still feature occasional shower chances, though with less instability than the earlier part of the pattern.
Either way, the broad shape of the week is becoming clearer. Sunday starts the transition with scattered afternoon storms, Monday adds more frequent storm windows, Tuesday and Wednesday look most likely to bring the widest coverage of rain, and the forecast then gradually turns toward a drier but still somewhat uncertain finish to the week.
Check the latest forecast at the FingerLakes1.com Weather Center.
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