City of Portsmouth Weather Forecast
Local 7-day forecast
Mostly Clear
Track current conditions, temperature changes, wind, and the full daily outlook for City of Portsmouth in one place.
Mostly clear, with a low around 67. Southeast wind around 1 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 2:50 AM 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 2:50 AM EDT
- Forecast office
- ILN
- Source
- NOAA / NWS
Daily Outlook
This Week in City of Portsmouth
Wednesday looks like the warmest upcoming period in City of Portsmouth at 94 degrees F.
Friday Night is the coolest period ahead with temperatures near 63 degrees F.
The strongest winds are forecast for Friday at about 1 to 6 mph NE.
Precipitation is mentioned in 12 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 16, 2026 2:50 AM EDT
- Coverage
- 7 days
- Time zone
- America/New_York
- Forecast office
- ILN
- Radar station
- KILN
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Sunny, with a high near 94. Heat index values as high as 102. Southwest wind around 2 mph. New rainfall amounts less than a tenth of an inch possible.
A slight chance of showers and thunderstorms after 10pm. Mostly clear, with a low around 70. Heat index values as high as 100. South wind around 1 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
A slight chance of showers and thunderstorms between 7am and 2pm. Mostly sunny, with a high near 92. Heat index values as high as 102. West wind 0 to 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 69. Northwest wind around 2 mph. Chance of precipitation is 40%.
A chance of rain showers before 2pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 40%.
A slight chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 63.
Sunny, with a high near 89.
A chance of showers and thunderstorms after 8pm. Partly cloudy, with a low around 68. Chance of precipitation is 30%.
A slight chance of rain showers before 2pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.
A slight chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 50%.
A chance of rain showers. Partly sunny, with a high near 81.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Sep 16
|
Mostly Clear
|
67°F |
1 mph
SE
|
|
Wednesday
Sep 16
|
Sunny
|
94°F |
2 mph
SW
|
|
Wednesday Night
Sep 16
|
Slight Chance Showers And Thunderstorms
|
70°F |
1 mph
S
|
|
Thursday
Sep 17
|
Slight Chance Showers And Thunderstorms
|
92°F |
0 to 5 mph
W
|
|
Thursday Night
Sep 17
|
Chance Showers And Thunderstorms
|
69°F |
2 mph
NW
|
|
Friday
Sep 18
|
Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
85°F |
1 to 6 mph
NE
|
|
Friday Night
Sep 18
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
63°F |
0 to 5 mph
NE
|
|
Saturday
Sep 19
|
Sunny
|
89°F |
2 mph
SE
|
|
Saturday Night
Sep 19
|
Chance Showers And Thunderstorms
|
68°F |
2 mph
S
|
|
Sunday
Sep 20
|
Chance Showers And Thunderstorms
|
90°F |
2 to 6 mph
SW
|
|
Sunday Night
Sep 20
|
Chance Showers And Thunderstorms
|
67°F |
1 to 5 mph
S
|
|
Monday
Sep 21
|
Chance Showers And Thunderstorms
|
86°F |
5 mph
SW
|
|
Monday Night
Sep 21
|
Chance Showers And Thunderstorms
|
64°F |
1 to 5 mph
SE
|
|
Tuesday
Sep 22
|
Chance Rain Showers
|
81°F |
2 to 6 mph
N
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around City of Portsmouth.