Marine Weather Net

Portsmouth, NH Weather Forecast




Portsmouth, New Hampshire

 Lat: 43.07N, Lon: 70.76W

Current Conditions Updated: 1155 PM EDT MON JUL 13 2026

Mostly Clear
Temp: 78°F
  • Humidity:
  • 60%
  • Winds:
  • 7 MPH SSW
  • Gusts:
  • N/A MPH
  • Barometer:
  • 29.99 in.
  • Dewpoint:
  • 63°F
  • Heat index:
  • 79°F

  • Sunrise:
  • 5:15 AM EDT
  • Sunset:
  • 8:19 PM EDT
  • Moonrise:
  • 5:08 AM EDT
  • Moonset:
  • 8:58 PM EDT

TONIGHT

CLEARING

Lo: 70°F

TUESDAY

PARTLY SUNNY
Hi: 95°F
Lo: 75°F

WEDNESDAY

PARTLY SUNNY
Hi: 91°F
Lo: 69°F

THURSDAY

MOSTLY SUNNY
Hi: 91°F
Lo: 65°F
Weather Forecast In Detail:
Forecast Issued: 654 PM EDT Mon Jul 13 2026

HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TO 8 PM EDT TUESDAY
Tonight...Partly cloudy this evening, then clearing. Lows around 70. Southwest winds around 10 mph with gusts up to 20 mph. Heat index values around 90 early this evening.
Tuesday...Partly sunny. Hot with highs in the mid 90s. Southwest winds around 10 mph. Gusts up to 25 mph in the afternoon. Heat index values up to 100 in the afternoon.
Tuesday Night...Partly cloudy. Humid with lows in the mid 70s. West winds around 10 mph. Heat index values up to 101 early in the evening.
Wednesday...Partly sunny. Hot with highs in the lower 90s. Northwest winds around 10 mph with gusts up to 25 mph.
Wednesday Night...Mostly clear. Lows in the upper 60s. Northwest winds around 10 mph with gusts up to 20 mph in the evening, becoming light and variable.
Thursday...Mostly sunny. Hot with highs in the lower 90s.
Thursday Night...Partly cloudy in the evening, then clearing. Lows in the mid 60s.
Friday...Mostly sunny. Highs in the lower 80s.
Friday Night...Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 60s.
Saturday...Partly sunny. A chance of showers in the afternoon. Highs in the lower 80s. Chance of rain 30 percent.
Saturday Night...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers. Lows in the lower 60s. Chance of rain 50 percent.
Sunday...Partly sunny with a chance of showers. Highs in the upper 70s. Chance of rain 30 percent.
Sunday Night...Partly cloudy with a chance of showers. Lows in the lower 60s. Chance of rain 30 percent.
Monday...Partly sunny with a chance of showers. Highs in the lower 80s. Chance of rain 30 percent.
SHARE THIS PAGE: