The Finger Lakes and Central New York are in for a quiet finish to August on Saturday, with early patchy fog giving way to a mostly sunny and pleasant afternoon before the next weather change arrives later in the weekend.
Saturday is expected to be the calmer half of the forecast, according to the National Weather Service offices in Buffalo and Binghamton, but that break will start to narrow Sunday as warmer, more humid air returns and the first showers and thunderstorms push in sooner than earlier forecasts had suggested.
Saturday starts cool, then turns brighter
The day began with the kind of late-summer setup that often follows a clear, calm night across upstate New York. Pockets of patchy fog were expected through early to midmorning, especially across the Southern Tier, the Finger Lakes and other lower-lying spots where overnight cooling was strongest.
That reduced visibility is not expected to last deep into the day. Once the fog burns off, the region should settle into mostly sunny skies with only a few passing mid- and high-level clouds. The broader signal from both forecast offices points to a dry day with light winds and no meaningful rain threat across most of the region.
Temperatures are also expected to recover quickly after the cool start. Highs should reach the mid to upper 70s for much of Central New York and the Finger Lakes, close to late-August averages, with the most comfortable air of the next several days still in place. Areas that hold onto fog a little longer, especially in valleys south of the Thruway corridor, may take a bit longer to warm, but the larger trend is toward a mild and brighter afternoon.
For much of the Finger Lakes, that should make Saturday the most straightforward weather day in the near-term forecast. The atmosphere is stable, humidity remains manageable, and neither office is pointing to organized daytime hazards.
Tonight stays calm as clouds begin to return
The same high pressure system supporting Saturday's dry weather will keep conditions fairly quiet into Saturday night. Skies will stay mostly clear early, and the combination of light winds and another cool evening will allow temperatures to drop back into the low 50s in many places overnight.
That setup may allow another round of patchy fog to form late at night and toward daybreak Sunday, especially in the Southern Tier river valleys and other fog-prone locations. Not every community will see it, but the pattern is favorable for at least localized visibility issues before sunrise.
Farther west, the next shift in the pattern will begin to show up as clouds increase from west to east overnight. That cloud increase will be the first visible sign that the weekend forecast is beginning to turn, even though most of Saturday night is still expected to remain dry.
Sunday turns warmer and more unsettled late
Sunday still does not look like a washout from start to finish, but it no longer appears to be a full dry day. Both forecast offices now point to showers and thunderstorms developing earlier than previously expected, with the first meaningful chances arriving late Sunday afternoon and continuing into Sunday evening.
Before that happens, the day should trend warmer and noticeably more humid. As high pressure slides east, southwest return flow is expected to bring in a stickier air mass, with temperatures rising into the low 80s across much of the region and dew points climbing into the mid-60s. That should be enough to make Sunday feel more like midsummer than the more comfortable air in place on Saturday.
The timing matters because the first round of rain is tied to a disturbance moving through the broader westerly flow while a warm front strengthens from the upper Great Lakes toward New York. The Buffalo office noted that the richest moisture transport and strongest forcing should stay farther west across the upper Great Lakes, but enough moisture and weak forcing are expected to spread into western and central New York to support at least scattered showers by afternoon.
That means the later part of Sunday carries the higher risk for interruptions to outdoor plans, especially from the Finger Lakes east into Central New York and south toward the higher terrain. Forecast confidence is stronger on the idea that rain chances arrive during the second half of the day than on the exact coverage or which communities see a thunderstorm first.
An unsettled stretch follows into early next week
The bigger forecast story after the weekend is the shift away from the dry, stable pattern and into a more active one. From Sunday night through at least Tuesday, both offices describe an unsettled setup with increasing humidity and several rounds of showers and thunderstorms as a frontal zone wavers across New York and Pennsylvania.
That boundary is expected to meander north and south at times while shortwave disturbances move through the flow aloft. In practical terms, that supports repeated chances for rain and thunderstorms rather than one clean, fast-moving system. The exact timing of each round is still less certain this far out, but the overall message is that the workweek starts with a more changeable pattern than the weekend.
The Buffalo office said instability should likely remain limited during the Sunday night through Tuesday period, which should keep the severe weather risk low for now. That does not remove the chance for thunder or downpours, but it does suggest the early-week pattern is more about repeated unsettled periods and rising humidity than a clearly defined severe weather event.
The Binghamton office carries a similar view for Monday through Wednesday, noting scattered showers and thunderstorms are possible, especially during the afternoon and evening hours. That lines up with a forecast in which many places may still have stretches of dry time, but confidence remains too low to pin down exactly when each round develops this far in advance.
Wednesday bears watching, but details are still uncertain
By the middle of next week, the tone of the forecast becomes a little more cautious. The Buffalo office said the pattern could become more favorable for severe weather potential by Wednesday as a stronger shortwave moves east across southern Canada and interacts with a warm, humid air mass over the eastern Great Lakes.
The Binghamton office also highlighted Wednesday afternoon as a period with some potential if one of the disturbances lines up with peak daytime heating. Even so, that office stressed it is still too early to forecast severe thunderstorm potential with confidence this far out.
That distinction matters in a five-day forecast. There is a difference between saying the setup is worth monitoring and saying severe weather is expected, and the current forecast remains in the first category. The signal for midweek is that the environment may become more supportive of stronger storms, but the exact timing, storm coverage and eventual strength are not settled yet.
For now, the clearest parts of the forecast remain the pleasant finish to Saturday, the warmer and more humid feel on Sunday, and the earlier arrival of shower and thunderstorm chances late Sunday into Sunday evening. After that, the weather turns more active across the Finger Lakes and Central New York through early next week, with Wednesday the period most likely to draw closer attention as newer forecasts refine the details.
Check the latest forecast at the FingerLakes1.com Weather Center.
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