As of 03:25 CST

Weather in Portsmouth, IA

31°

Portsmouth, Saturday, 7 November, 03:25

Overcast. Feels like 25°. High 56°, low 31°.

Pressure30.21 inHg

Wind6.3 mph S

Humidity94%

Visibility6.2 mi

Dew point30°

See detailed hourly forecast

Sun, 0860° / 41°

60 °

Portsmouth, Sunday, 8 November

Clear. High 60°, low 41°.

Pressure30.18 inHg

Wind5.9 mph NW

Humidity52%

Visibility6.2 mi

Dew point41°

Mon, 0966° / 44°

66 °

Portsmouth, Monday, 9 November

Partly cloudy. High 66°, low 44°.

Pressure30.06 inHg

Wind9.1 mph SW

Humidity59%

Visibility6.2 mi

Dew point48°

Tue, 1064° / 43°

64 °

Portsmouth, Tuesday, 10 November

Partly cloudy. High 64°, low 43°.

Pressure30.09 inHg

Wind3.8 mph SE

Humidity49%

Visibility6.2 mi

Dew point42°

Wed, 1159° / 45°

59 °

Portsmouth, Wednesday, 11 November

Clear. High 59°, low 45°.

Pressure29.94 inHg

Wind16.6 mph NW

Humidity56%

Visibility—

Dew point41°

Thu, 1245° / 36°

45 °

Portsmouth, Thursday, 12 November

Mostly clear. High 45°, low 36°.

Pressure30.21 inHg

Wind12.7 mph N

Humidity61%

Visibility—

Dew point30°

Fri, 1340° / 26°

40 °

Portsmouth, Friday, 13 November

Clear. High 40°, low 26°.

Pressure30.27 inHg

Wind7.8 mph N

Humidity43%

Visibility—

Dew point16°

Sat, 1455° / 30°

55 °

Portsmouth, Saturday, 14 November

Partly cloudy. High 55°, low 30°.

Pressure30.00 inHg

Wind15 mph SW

Humidity48%

Visibility—

Dew point28°

Sun, 1563° / 43°

63 °

Portsmouth, Sunday, 15 November

Overcast. High 63°, low 43°.

Pressure29.94 inHg

Wind8.5 mph S

Humidity60%

Visibility—

Dew point43°

Mon, 1659° / 50°

59 °

Portsmouth, Monday, 16 November

Overcast. High 59°, low 50°.

Pressure29.94 inHg

Wind15.1 mph S

Humidity83%

Visibility—

Dew point52°

Tue, 1760° / 49°

60 °

Portsmouth, Tuesday, 17 November

Light rain. High 60°, low 49°.

Pressure30.03 inHg

Wind14.3 mph S

Humidity88%

Visibility—

Dew point53°

Wed, 1857° / 45°

57 °

Portsmouth, Wednesday, 18 November

Clear. High 57°, low 45°.

Pressure30.18 inHg

Wind9.1 mph N

Humidity39%

Visibility—

Dew point29°

Thu, 1954° / 42°

54 °

Portsmouth, Thursday, 19 November

Overcast. High 54°, low 42°.

Pressure30.33 inHg

Wind9.7 mph S

Humidity48%

Visibility—

Dew point32°

Fri, 2054° / 43°

54 °

Portsmouth, Friday, 20 November

Overcast. High 54°, low 43°.

Pressure30.33 inHg

Wind10.1 mph NW

Humidity56%

Visibility—

Dew point36°

Sat, 2153° / 37°

53 °

Portsmouth, Saturday, 21 November

Clear. High 53°, low 37°.

Pressure30.53 inHg

Wind10.8 mph SW

Humidity40%

Visibility—

Dew point25°

Sun, 2253° / 36°

53 °

Portsmouth, Sunday, 22 November

Clear. High 53°, low 36°.

Pressure30.33 inHg

Wind13.2 mph SW

Humidity34%

Visibility—

Dew point22°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Portsmouth, IA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Portsmouth, IA since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.