Best Time to Drive from South Boston to Portsmouth

Right now (8:51 pm EDT): about 75 minutes via I-95 North, usually 73 at this time.

Only 40% of this drive is measured by working traffic sensors right now. The rest is estimated from nearby sensors, typical speeds and street traffic, so times can be off. Why so few sensors work.

About this drive

On weekdays the 59-mile drive from South Boston to Portsmouth (via I-95 North) usually takes as little as 70 minutes and up to 88 minutes, when leaving around 4 pm on Thursdays. The fastest times to leave are before 8 am or after 6 pm. Midday (11 am to 2 pm) it takes about 74 minutes. On weekends it is slowest around 3:30 pm on Sundays (76 minutes).

About 39 miles of it is freeway, where times follow typical and live traffic from our sensors, and about 20 miles surface streets (26 to 34 minutes on weekdays), estimated from how jammed the freeways around them are at that time. Drive times are measured from central South Boston to central Portsmouth along the route on the map. Starting or ending elsewhere in a big city can add or save several minutes.

Simulated from typical freeway speeds at each point of the drive for the time you would reach it, from every 5-minute reading we have recorded. We don't have sensors on surface streets yet, so the time on them is estimated from how congested the freeways around each end of the drive are at that time, in both directions: streets jam when the freeways do.

Questions

What is the best time to drive from South Boston to Portsmouth?

On weekdays, leave before 8 am or after 6 pm. The drive usually takes about 70 minutes then, versus up to 88 minutes at the worst times.

How long does it take to drive from South Boston to Portsmouth?

The 59-mile drive usually takes 70 to 88 minutes on weekdays, depending on when you leave, and about 74 minutes midday.

When is traffic worst from South Boston to Portsmouth?

Leaving around 4 pm on Thursdays is usually slowest, about 88 minutes.

Freeways on this drive

I-95 North in Boston (30 miles) · I-90 West in Boston (7 miles) · I-90 East in Boston (2 miles)

Boston traffic right now · Boston traffic tomorrow

More drives

Portsmouth to South Boston (return trip) · South Boston to Providence · South Boston to Fall River · South Boston to Nashua · South Boston to New Bedford · South Boston to Haverhill · South Boston to Malden · South Boston to Medford · South Boston to Taunton · South Boston to Weymouth · South Boston to Revere · South Boston to Peabody

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