Weather in Portsmouth, IA
Updated 2026-08-11 10:30 local time · ZIP codes 51565
Sunny
No government weather alerts were returned for this location at the latest update.
Next hours
79°12% rain88°9% rain91°4% rain93°3% rain94°2% rain94°2% rain94°2% rain93°2% rain91°3% rain89°4% rain86°4% rain
83°5% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 9%).
It feels like 84°F with winds near 8 mph.
86°F, 4% rain chance and 13 mph wind.
Visibility is around 6 mi; gusts may reach 28 mph.
Current temperature is 79°F, wind 8 mph, rain chance up to 9%.
UV index is 3. Sunscreen and sunglasses are sensible for longer outdoor time.
Portsmouth weather today
Sunny and 79°F in Portsmouth, IA. Today's high is 94°F with a 8% rain chance. Winds are around 8 mph with gusts near 11 mph. Relative humidity is 86%, pressure is 29.80 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Portsmouth
Sunrise is at 06:26 AM and sunset is at 08:27 PM. Tomorrow's forecast calls for Sunny with a high near 94°F and a low near 72°F. The maximum rain chance is 4%.