Portsmouth, IA Weather Forecast
Local 7-day forecast
Partly Sunny then Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Portsmouth, IA in one place.
A slight chance of showers and thunderstorms between 1pm and 2pm. Partly sunny, with a high near 81. South southeast wind 10 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Portsmouth, IA 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: Jun 2, 2026 2:12 AM CDT.
The active forecast window currently covers Jun 3 to Jun 8, 2026 for Portsmouth, IA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 3 to Jun 8, 2026
- Latest sync
- Jun 2, 2026 2:12 AM CDT
- Forecast office
- OAX
- Source
- NOAA / NWS
Daily Outlook
This Week in Portsmouth
Saturday looks like the warmest upcoming period in Portsmouth at 86 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 61 degrees F.
The strongest winds are forecast for Wednesday at about 10 to 16 mph SSE.
Precipitation is mentioned in 11 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 2, 2026 2:12 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- OAX
- Radar station
- KOAX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 61. South wind 10 to 16 mph, with gusts as high as 22 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms before 4pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 83. South wind 9 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms before 1am, then showers and thunderstorms likely. Mostly cloudy, with a low around 63. South wind 7 to 10 mph, with gusts as high as 16 mph.
Showers and thunderstorms likely before 7am, then a chance of showers and thunderstorms. Partly sunny, with a high near 85. South wind 7 to 12 mph, with gusts as high as 17 mph.
Showers and thunderstorms likely. Partly cloudy, with a low around 63. South wind 5 to 9 mph.
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 86. South southwest wind 3 to 8 mph.
A slight chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 64. Southeast wind around 7 mph.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms. Partly sunny, with a high near 85. Southeast wind 5 to 13 mph, with gusts as high as 18 mph.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 5 to 10 mph, with gusts as high as 16 mph.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 85. Southeast wind 5 to 9 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Jun 3
|
Partly Sunny then Slight Chance Showers And Thunderstorms
|
81°F |
10 to 16 mph
SSE
|
|
Wednesday Night
Jun 3
|
Mostly Cloudy then Chance Showers And Thunderstorms
|
61°F |
10 to 16 mph
S
|
|
Thursday
Jun 4
|
Chance Showers And Thunderstorms
|
83°F |
9 to 13 mph
S
|
|
Thursday Night
Jun 4
|
Chance Showers And Thunderstorms
|
63°F |
7 to 10 mph
S
|
|
Friday
Jun 5
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
85°F |
7 to 12 mph
S
|
|
Friday Night
Jun 5
|
Showers And Thunderstorms Likely
|
63°F |
5 to 9 mph
S
|
|
Saturday
Jun 6
|
Slight Chance Showers And Thunderstorms
|
86°F |
3 to 8 mph
SSW
|
|
Saturday Night
Jun 6
|
Slight Chance Showers And Thunderstorms
|
64°F |
7 mph
SE
|
|
Sunday
Jun 7
|
Chance Showers And Thunderstorms
|
85°F |
5 to 13 mph
SE
|
|
Sunday Night
Jun 7
|
Chance Showers And Thunderstorms
|
65°F |
5 to 10 mph
SE
|
|
Monday
Jun 8
|
Chance Showers And Thunderstorms
|
85°F |
5 to 9 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Portsmouth.