City of Portsmouth Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for City of Portsmouth in one place.
Mostly sunny, with a high near 70. South wind 5 to 10 mph.
Local Weather Overview
This forecast page for City of Portsmouth is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Sep 16, 2026 12:49 PM EDT.
The active forecast window currently covers Sep 16 to Sep 22, 2026 for City of Portsmouth.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 16 to Sep 22, 2026
- Latest sync
- Sep 16, 2026 12:49 PM EDT
- Forecast office
- GYX
- Source
- NOAA / NWS
Daily Outlook
This Week in City of Portsmouth
Today looks like the warmest upcoming period in City of Portsmouth at 70 degrees F.
Friday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Today at about 5 to 10 mph S.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 16, 2026 12:49 PM EDT
- Coverage
- 7 days
- Time zone
- America/New_York
- Forecast office
- GYX
- Radar station
- KGYX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly cloudy, with a low around 61. West wind 0 to 5 mph.
A chance of rain showers after 1pm. Mostly cloudy, with a high near 67. Northeast wind around 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Rain showers likely before 5am. Mostly cloudy, with a low around 62. Southwest wind 0 to 5 mph. Chance of precipitation is 70%.
Mostly sunny, with a high near 70. Northwest wind 5 to 10 mph.
Mostly clear, with a low around 52.
Mostly sunny, with a high near 61.
A slight chance of rain showers after 4am. Mostly cloudy, with a low around 53.
A chance of rain showers. Mostly cloudy, with a high near 61. Chance of precipitation is 50%.
A chance of rain showers. Mostly cloudy, with a low around 54. Chance of precipitation is 50%.
A slight chance of rain showers before 9am. Partly sunny, with a high near 61.
A chance of rain showers after 7pm. Mostly cloudy, with a low around 55. Chance of precipitation is 30%.
A chance of rain showers before 5pm. Partly sunny, with a high near 61. Chance of precipitation is 30%.
A slight chance of rain showers after 8pm. Partly cloudy, with a low around 54.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Sep 16
|
Mostly Sunny
|
70°F |
5 to 10 mph
S
|
|
Tonight
Sep 16
|
Mostly Cloudy
|
61°F |
0 to 5 mph
W
|
|
Thursday
Sep 17
|
Mostly Cloudy then Chance Rain Showers
|
67°F |
5 mph
NE
|
|
Thursday Night
Sep 17
|
Rain Showers Likely
|
62°F |
0 to 5 mph
SW
|
|
Friday
Sep 18
|
Mostly Sunny
|
70°F |
5 to 10 mph
NW
|
|
Friday Night
Sep 18
|
Mostly Clear
|
52°F |
5 to 10 mph
N
|
|
Saturday
Sep 19
|
Mostly Sunny
|
61°F |
5 mph
E
|
|
Saturday Night
Sep 19
|
Mostly Cloudy then Slight Chance Rain Showers
|
53°F |
5 mph
S
|
|
Sunday
Sep 20
|
Chance Rain Showers
|
61°F |
5 to 10 mph
S
|
|
Sunday Night
Sep 20
|
Chance Rain Showers
|
54°F |
5 mph
W
|
|
Monday
Sep 21
|
Slight Chance Rain Showers then Partly Sunny
|
61°F |
5 to 10 mph
NE
|
|
Monday Night
Sep 21
|
Chance Rain Showers
|
55°F |
5 mph
NE
|
|
Tuesday
Sep 22
|
Chance Rain Showers
|
61°F |
5 to 10 mph
NE
|
|
Tuesday Night
Sep 22
|
Slight Chance Rain Showers
|
54°F |
5 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around City of Portsmouth.