Updated: 622 AM EST Thu Nov 20 2025
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Aside from some rain Friday evening into Saturday ahead of a cold front, dry and seasonably cool weather will prevail through early next week as high pressure dominates our weather.
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THROUGH TONIGHT
High pressure remains over the region today, but weak upper-level energy will bring more high-level cloudiness. As a result, high temperatures wont be quite as warm as yesterday, staying in the low to mid-40s. Winds start light northerly, but become light and variable by the afternoon..
FRIDAY
Tonight: Skies begin to clear this evening as the weak shortwave energy moves offshore. With light winds again overnight, low temps will be able to dip into the low 20s again away from the coasts and urban areas. Hi-res guidance indicate the potential for some patchy radiation fog along the east coast with dewpoints rising slightly into the low 20s. With temperatures below freezing, there is a low chance for freezing fog/drizzle in areas where fog becomes dense. If freezing fog does form, it will likely just impact elevated surfaces as ground temps may still be above freezing.
Friday: High pressure begins to shift offshore while a weak southern stream shortwave approaches from the SW. WAA will bring 850mb temps from +2C to +6C on Friday, helping high temps approach the low 50s.
Skies start mostly sunny, but more high clouds filter in late in the day as that shortwave nears. A bit more breezy on Friday with SW winds at 10-15mph..
FRIDAY NIGHT THROUGH WEDNESDAY
Key Messages:
* Overall, no impactful weather conditions are expected Friday night through early next week.
* Chance for light rain Friday night into early Saturday, otherwise a mostly dry extended forecast.
Deterministic models and ensemble members continue to have agreement with a northern stream shortwave moving across northern New England Friday evening. Thus, expect the daylight hours remains dry, with a better chance for showers overnight into early Saturday. Where there is disagreement is among how much moisture is available. GFS and NAM are more robust, PWATs 0.8" to 1.0", while ECMWF and Canadian favor less in the way of moisture. Generally less than 0.6" for the areas away from the south coast of CT, RI, and MA.
Think the GFS is more robust due to a weak low pressure development over the waters south of southern New England. Nevertheless, the environment is a weakly forced and do not expect any impacts. FWIW, DESI probabilities for 0.25" are best in areas south/east of Hartford, Worcester, to Boston with probabilities between 25 and 45 percent. Southwest flow leads to a seasonable Friday with temperatures reaching the low-50s for the coastal plain and upper-40s across the high terrain. Cold front swings through on Saturday, 850mb temperatures at 12z are -2C to +2C and by 00z Sunday temperatures drop -6C to -2C. Lingering moisture could result in flurries. Highs are in the 30s for the high terrain and 40s for the coastal plain.
The 500mb flow is quasi-zonal, a shortwave passage Sunday evening into early Monday lends to added cloud cover given limited moisture as PWATs are generally less than 0.4".
Otherwise dry conditions are expected through Tuesday with high pressure and mid-level ridging across the east coast. Temperatures are seasonable, afternoon highs are low-50s to upper-40s and nighttime lows are in the 30s.
By midweek, there is a shift in the pattern, a return to unsettled conditions as the mid-level ridge and surface high shifts into the North Atlantic. There remains a good bit of spread amongst guidance given this timeframe is 6 to 7 days out. Something to watch as these days lead up to Thanksgiving and busy travel days..
Forecaster Confidence Levels...
Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.
12z TAF Update:
Today... Moderate Confidence.
Mainly VFR. MVFR ceilings develop across the eastern waters which could impact Cape/Islands terminals, plus Logan by 16z. Light and variable winds, becoming NNE to NE for eastern MA terminals.
Tonight... High Confidence.
VFR. Light and variable winds.
Friday Moderate Confidence.
VFR, areas across the south coast have the best potential to lower to MVFR after 20z. SW winds 8 to 12 knots, gusting to 20 knots at the coast.
KBOS Terminal...Moderate confidence in TAF.
VFR. MVFR ceilings develop across the eastern waters which could impact Logan by 16z. Light WNW winds turning more northerly by daybreak, becoming variable Thursday afternoon.
KBDL Terminal...High confidence in TAF.
VFR. Light and variable winds.
Outlook /Friday Night through Monday/...
Friday Night: Mainly VFR, with local IFR possible. Chance RA.
Saturday: VFR. Breezy. Slight chance RA.
Saturday Night: VFR. Breezy.
Sunday through Sunday Night: VFR.
Monday: VFR. Breezy.
Forecaster Confidence Levels...
Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.
Key Messages:
* High confidence through the weekend. No headlines anticipated.
High pressure maintains light N/NE winds through Thursday with seas less than 3 feet. An approaching cold front late Friday night into Saturday should bring some rain, before another high builds into region over weekend.
Outlook /Friday Night through Monday/...
Friday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain.
Saturday: Winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain.
Saturday Night: Winds less than 25 kt. Seas locally approaching 5 ft.
Sunday: Winds less than 25 kt.
Sunday Night: Winds less than 25 kt. Slight chance of rain.
Monday: Winds less than 25 kt. Seas locally approaching 5 ft.