AFD - Boston

Updated: 325 AM EDT Fri Jul 4 2025

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Synopsis

Quiet weather with less humidity for Independence Day into the weekend, but heat and humidity kick up for Sunday and the start of next week. Rain returns Tuesday into mid week.

Forecast & Tides
Fri
81° 60°
Sat
83° 68°
Sun
91° 72°
Mon
90° 72°
Tue
84° 68°
Wed
79° 66°
Thu
78° None°
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Graphical Wind




































Near Term

THROUGH TONIGHT
Key Messages...

* Dry, sunny, and less humid for Independence Day.

We'll ring in the holiday weekend with a beautiful weather day for outdoor activities. A drier post frontal airmass ahead of building high pressure will bring seasonable high temperatures in the upper 70s and low 80s across the region. Winds will be light out of the northwest. Overnight, lower dewpoints will allow temps to drop into the upper 50s outside of Cape Cod and the islands. .

Short Term

SATURDAY
Key Messages...

* Dry and sunny Saturday, a bit warmer.

Saturday mid level heights will be on the rise as 500 mb ridging moves overhead with high pressure at the surface. This keeps in place sunny skies with light winds, while weak WAA will allow high temps to creep up a few degrees into the mid-upper 80s. Even so, dewpoints remain in the 50s for most, so humidity remains comfortable. .

Long Term

SATURDAY NIGHT THROUGH THURSDAY

Key Messages...

* Dry Sunday and Monday.

* Heat and humidity increase Sunday into early next week.

* Chance for showers and thunderstorms returns Monday night into Tuesday.

The synoptic pattern features an east coast ridge on Sunday followed by generally zonal flow to start the week, then a mid level trough digs into the Midwest/Great Lakes Tue-Thu. SNE will be placed downstream of the trough, pumping up the heat and humidity on warm, moist SW flow through at least Monday. This brings the return of 90s for high temperatures Sunday and Monday with dewpoints in the upper 60s and low 70s. A few shortwaves will round the base of the trough and move over SNE through the week bringing the risk for showers and thunderstorms, first around Tuesday then again toward Thursday.

Confidence in timing and coverage is low at this point. .

Aviation

Forecaster Confidence Levels...

Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.

06z TAF Update...High confidence.

SKC Fri Through Sat. Winds shift to NW tonight and could gust to 20kt Fri before diminishing. SW winds 5-10 kts on Sat.

KBOS Terminal...High confidence in TAF.

KBDL Terminal...High confidence in TAF.

Outlook /Saturday Night through Tuesday/...

Saturday Night through Sunday Night: VFR. Breezy.

Monday: VFR. Breezy. Slight chance SHRA, slight chance TSRA.

Monday Night: Mainly VFR, with local IFR possible. Breezy. Chance SHRA, slight chance TSRA.

Tuesday: Breezy. Chance SHRA, chance TSRA.

Marine

Forecaster Confidence Levels...

Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent.

Today through Saturday...High confidence.

Winds/seas stay below small craft advisory thresholds through Saturday. Winds will generally be between 5 and 15 kts with wave heights between 2-3 ft on Friday and between 1-2 ft on Saturday.

Outlook /Saturday Night through Tuesday/...

Saturday Night: Winds less than 25 kt.

Sunday through Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of seas approaching 5 ft.

Monday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of seas approaching 5 ft.

Monday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers.

Tuesday: Winds less than 25 kt. Chance of rain showers, slight chance of thunderstorms.

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