Clouds increase ahead of wet mid-week

finger lakes weather forecast monday september 20 2021 sun thin clouds mild
A warm, sunny day is ahead though clouds will start to gradually increase ahead of an active mid-week. [Photo by Meteorologist Drew Montreuil]

High Pressure Pushes Away

A large area of high pressure moved overhead yesterday and is along the New England coast this morning.

Meanwhile, low pressure over the northern Plains is helping tropical moisture over the Deep South move northward.

For today, the high pressure system will be the primary factor in the weather locally. There should be a good deal of sunshine, despite a gradual increase in thin clouds high in the atmosphere riding out ahead of the unsettled weather to our west.

With the high to the east, the clockwise flow of air around high pressure systems has our region back in a southerly flow. South winds will blow at 5-10 mph during the day, increasing to 10-15 mph tonight.

The wind and filtered sunshine will give temperatures a boost. Some low 80s are expected in the Rochester area with widespread mid and upper 70s for the rest of the region. Dewpoints will remain comfortable in the 50s.

Nighttime temperatures will range from the low 60s in Monroe and Wayne county, down to the mid 50s throughout Southern Tier and into Cortland County.

Clouds will continue to thicken through the night. Tuesday should have less sunshine filtering through the clouds than today, but it will probably not be a completely drab, cloudy day.

South winds will persist, with 10-15 mph speeds continuing into the morning before dropping back to the 5-10 mph range for the afternoon.

Temperatures will be a touch cooler, with highs mostly in the low and mid 70s.

finger lakes weather 7-day forecast monday september 20 2021
This graphic represents an average over the entire Finger Lakes region. Localized variations should be expected. Click to enlarge.

Rainy Mid-Week Weather

By Tuesday evening, areas of showers will start to push into the region. On and off rain showers are likely through the night and into Wednesday.

A new area of low pressure will start to develop over the Ohio Valley Tuesday night and will quickly strengthen on Wednesday. The low will initially move northward, but then will track westward Wednesday night.

This makes Wednesday a bit uncertain since we will be on the eastern fringes of the precipitation from this system. At this time, it is best to expect at least some scattered showers. It is possible, though, that most of the day will actually turn out dry.

High temperatures Wednesday should reach the mid 70s. The temperature will not drop much Wednesday night, with overnight lows in the upper 60s to near 70. Dewpoints will rise into the mid and upper 60s.

A band of rain will slowly track across the region on Thursday as the low pressure system starts to move back eastward and its associated cold front arrives in our region. Some of the rain could come down heavily and chances for an inch or more of rain are high. Thankfully, the chances for excessive, flood inducing rainfall seems quite low.

Winds will be blustery Wednesday night and Thursday as well, with gusts of 30-40 mph until the front moves through.

The rain will end by Friday morning and skies will be quite sunny for a time. Some afternoon clouds will likely bubble up. Highs Friday will likely be in the upper 60s.

A secondary front will slide through with a band of showers later Saturday. This will knock highs from the low 70s on Saturday to the mid 60s on Sunday.

Behind this front, highs in the 60s will become commonplace as we close out September and head solidly into autumn.

More Information:

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finger lakes weather 7-day forecast monday september 20 2021
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.

  1. Gail Burger Dalmat

    Hoo RAY! Cooler weather!!!!