Portsmouth, Iowa 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 69°F 21°C	Observed at: Portsmouth, IA	Elevation: 1191 ft | 363 m
	Last Updated: July 29, 6:00 AM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 69°F | 21°C
	Pressure: 28.56 in | 967 mb	Dewpoint: 67°F | 19°C
	Humidity: 91%	Wind: ESE 7 mph | ESE 11 kph
	Feels Like: 73°F | 23°C	Visibility: 27.1 mi | 43.6 km
	Lat/Long: 41.71 | -95.55	Sunrise: 6:13 AM   Sunset: 8:43 PM

7 Day Graphical Forecast

Valid: 6:08 AM 7/29/2026

Tonight Light Showers 69 °F 7% Chance Precipitation Thursday Overcast 91 |74 °F 74% Chance Precipitation Friday Light Showers 78 |64 °F 89% Chance Precipitation Saturday Clear 89 |61 °F 2% Chance Precipitation Sunday Overcast 92 |63 °F 0% Chance Precipitation Monday Overcast 95 |68 °F 1% Chance Precipitation Tuesday Light Drizzle 93 |63 °F 10% Chance Precipitation

7 Hour Graphical Forecast

Valid: 6:08 AM 7/29/2026

6 AM Clear 69 °F 1% Chance Precipitation

7 AM Overcast 70 °F 2% Chance Precipitation

8 AM Overcast 73 °F 2% Chance Precipitation

9 AM Clear 76 °F 2% Chance Precipitation

10 AM Clear 80 °F 2% Chance Precipitation

11 AM Clear 84 °F 2% Chance Precipitation

12 PM Clear 87 °F 1% Chance Precipitation

7 Day Textual Forecast - with QPF, Max Wind, Humidity, Snowfall & UV Index

7 Day & Night Weather Forecast for Portsmouth, IA - (Fahrenheit & Celsius) Valid: 6:08 AM 7/29/2026 Tonight Light Showers with a low around 69°F [21°C]. ESE wind to around 9 mph [14 kph], with gusts to near 15 mph [25 kph]. Chance of precipitation 7% with QPF of 0.09 in [2.2 mm]. Thursday Overcast with a high near 91°F [33°C]. SSE wind to around 12 mph [19 kph], with gusts to near 24 mph [38 kph]. Dewpoint near 67°F [19°C] with humidity of 75%. Pressure around 28.56 in [967 mb]. UV Index: 4.9. Chance of precipitation 74% with QPF of 0.00 in [0.1 mm]. Thursday Night Overcast with a low around 74°F [23°C]. SSE wind to around 12 mph [19 kph], with gusts to near 24 mph [38 kph]. Chance of precipitation 74% with QPF of 0.00 in [0.1 mm]. Friday Light Showers with a high near 78°F [25°C]. NE wind to around 22 mph [36 kph], with gusts to near 36 mph [58 kph]. Dewpoint near 67°F [19°C] with humidity of 99%. Pressure around 28.56 in [967 mb]. UV Index: 4.95. Chance of precipitation 89% with QPF of 0.42 in [10.8 mm]. Friday Night Light Showers with a low around 64°F [18°C]. NE wind to around 22 mph [36 kph], with gusts to near 36 mph [58 kph]. Chance of precipitation 89% with QPF of 0.42 in [10.8 mm]. Saturday Clear with a high near 89°F [32°C]. NE wind to around 9 mph [15 kph], with gusts to near 11 mph [18 kph]. Dewpoint near 67°F [19°C] with humidity of 94%. Pressure around 28.56 in [967 mb]. UV Index: 7.65. Chance of precipitation 2% with QPF of 0.00 in [0.0 mm]. Saturday Night Clear with a low around 61°F [16°C]. NE wind to around 9 mph [15 kph], with gusts to near 11 mph [18 kph]. Chance of precipitation 2% with QPF of 0.00 in [0.0 mm]. Sunday Overcast with a high near 92°F [33°C]. S wind to around 14 mph [23 kph], with gusts to near 31 mph [50 kph]. Dewpoint near 67°F [19°C] with humidity of 92%. Pressure around 28.56 in [967 mb]. UV Index: 7.7. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Sunday Night Overcast with a low around 63°F [17°C]. S wind to around 14 mph [23 kph], with gusts to near 31 mph [50 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Monday Overcast with a high near 95°F [35°C]. S wind to around 18 mph [29 kph], with gusts to near 36 mph [58 kph]. Dewpoint near 67°F [19°C] with humidity of 71%. Pressure around 28.56 in [967 mb]. UV Index: 7.45. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Monday Night Overcast with a low around 68°F [20°C]. S wind to around 18 mph [29 kph], with gusts to near 36 mph [58 kph]. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Tuesday Light Drizzle with a high near 93°F [34°C]. SSE wind to around 15 mph [24 kph], with gusts to near 34 mph [55 kph]. Dewpoint near 67°F [19°C] with humidity of 89%. Pressure around 28.56 in [967 mb]. UV Index: 6.65. Chance of precipitation 10% with QPF of 0.02 in [0.4 mm]. Tuesday Night Light Drizzle with a low around 63°F [17°C]. SSE wind to around 15 mph [24 kph], with gusts to near 34 mph [55 kph]. Chance of precipitation 10% with QPF of 0.02 in [0.4 mm].

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7 Day and Night - QPF Forecast for Portsmouth, IA

Tonight: 2.2 mm | 0.09 in

Thursday: 0.1 mm | 0.00 in

Thursday Night: 0.1 mm | 0.00 in

Friday: 10.8 mm | 0.42 in

Friday Night: 10.8 mm | 0.42 in

Saturday: 0.0 mm | 0.00 in

Saturday Night: 0.0 mm | 0.00 in

Sunday: 0.0 mm | 0.00 in

Sunday Night: 0.0 mm | 0.00 in

Monday: 0.0 mm | 0.00 in

Monday Night: 0.0 mm | 0.00 in

Tuesday: 0.4 mm | 0.02 in

Tuesday Night: 0.4 mm | 0.02 in

7 Day and Night - Maximum Wind Speed Forecast for Portsmouth, IA

Tonight: ESE @ 14 kph | 9 mph

Thursday: SSE @ 19 kph | 12 mph

Thursday Night: SSE @ 19 kph | 12 mph

Friday: NE @ 36 kph | 22 mph

Friday Night: NE @ 36 kph | 22 mph

Saturday: NE @ 15 kph | 9 mph

Saturday Night: NE @ 15 kph | 9 mph

Sunday: S @ 23 kph | 14 mph

Sunday Night: S @ 23 kph | 14 mph

Monday: S @ 29 kph | 18 mph

Monday Night: S @ 29 kph | 18 mph

Tuesday: SSE @ 24 kph | 15 mph

Tuesday Night: SSE @ 24 kph | 15 mph

7 Day and Night - Maximum Humidity Forecast for Portsmouth, IA

Tonight: 96 %

Thursday: 75 %

Thursday Night: 75 %

Friday: 99 %

Friday Night: 99 %

Saturday: 94 %

Saturday Night: 94 %

Sunday: 92 %

Sunday Night: 92 %

Monday: 71 %

Monday Night: 71 %

Tuesday: 89 %

Tuesday Night: 89 %

7 Day and Night - Snowfall Totals Forecast for Portsmouth, IA

Tonight: 0.0 cm | 0.00 in

Thursday: 0.0 cm | 0.00 in

Thursday Night: 0.0 cm | 0.00 in

Friday: 0.0 cm | 0.00 in

Friday Night: 0.0 cm | 0.00 in

Saturday: 0.0 cm | 0.00 in

Saturday Night: 0.0 cm | 0.00 in

Sunday: 0.0 cm | 0.00 in

Sunday Night: 0.0 cm | 0.00 in

Monday: 0.0 cm | 0.00 in

Monday Night: 0.0 cm | 0.00 in

Tuesday: 0.0 cm | 0.00 in

Tuesday Night: 0.0 cm | 0.00 in

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