Weather in Portsmouth, IA
Updated 2026-09-26 09:00 local time · ZIP codes 51565
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
57°33% rain
58°48% rain
60°19% rain
63°21% rain
65°30% rain67°63% rain67°71% rain66°67% rain66°76% rain66°59% rain66°72% rain
65°53% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Weather insights for today
Rain chance reaches about 76% over the next 12 hours.
It feels like 50°F with winds near 16 mph.
63°F, 21% rain chance and 17 mph wind.
Visibility is around 6 mi; gusts may reach 33 mph.
Current temperature is 57°F, wind 16 mph, rain chance up to 76%.
UV index is 0.
Local weather characteristics in Portsmouth
Iowa has a continental climate with hot summers, cold winters, strong winds and a notable spring and summer severe-thunderstorm season.
Portsmouth is part of the Midwest weather region. The forecast point is near 41.65°N latitude and 95.52°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.
Portsmouth weather today
Overcast and 57°F in Portsmouth, IA. Today's high is 67°F with a 92% rain chance. Winds are around 16 mph with gusts near 33 mph. Relative humidity is 95%, pressure is 30.02 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Portsmouth
Sunrise is at 07:13 AM and sunset is at 07:13 PM. Tomorrow's forecast calls for Patchy rain nearby with a high near 67°F and a low near 60°F. The maximum rain chance is 83%.