As of 08:40 CST

Weather in Portsmouth, IA

43°

Portsmouth, Wednesday, 4 November, 08:40

Overcast. Feels like 35°. High 48°, low 43°.

Pressure29.80 inHg

Wind15.2 mph W

Humidity85%

Visibility6.2 mi

Dew point39°

See detailed hourly forecast

Thu, 0553° / 45°

0.04

53 °

Portsmouth, Thursday, 5 November

Light rain. High 53°, low 45°.

Pressure29.97 inHg

Wind10.1 mph NW

Humidity63%

Visibility6.2 mi

Dew point38°

Fri, 0650° / 37°

50 °

Portsmouth, Friday, 6 November

Mostly clear. High 50°, low 37°.

Pressure30.30 inHg

Wind3.7 mph N

Humidity59%

Visibility6.2 mi

Dew point34°

Sat, 0757° / 36°

57 °

Portsmouth, Saturday, 7 November

Clear. High 57°, low 36°.

Pressure30.24 inHg

Wind8.8 mph SW

Humidity57%

Visibility6.2 mi

Dew point39°

Sun, 0863° / 43°

63 °

Portsmouth, Sunday, 8 November

Clear. High 63°, low 43°.

Pressure30.18 inHg

Wind6.5 mph SW

Humidity59%

Visibility—

Dew point43°

Mon, 0967° / 44°

67 °

Portsmouth, Monday, 9 November

Clear. High 67°, low 44°.

Pressure30.09 inHg

Wind10.6 mph SW

Humidity57%

Visibility—

Dew point46°

Tue, 1057° / 43°

57 °

Portsmouth, Tuesday, 10 November

Partly cloudy. High 57°, low 43°.

Pressure30.18 inHg

Wind6.6 mph NE

Humidity32%

Visibility—

Dew point25°

Wed, 1153° / 43°

53 °

Portsmouth, Wednesday, 11 November

Overcast. High 53°, low 43°.

Pressure30.24 inHg

Wind6.8 mph E

Humidity46%

Visibility—

Dew point31°

Thu, 1253° / 40°

53 °

Portsmouth, Thursday, 12 November

Partly cloudy. High 53°, low 40°.

Pressure30.30 inHg

Wind5.7 mph E

Humidity52%

Visibility—

Dew point33°

Fri, 1357° / 39°

57 °

Portsmouth, Friday, 13 November

Clear. High 57°, low 39°.

Pressure30.18 inHg

Wind9.8 mph SW

Humidity56%

Visibility—

Dew point37°

Sat, 1463° / 45°

63 °

Portsmouth, Saturday, 14 November

Clear. High 63°, low 45°.

Pressure30.09 inHg

Wind10.1 mph SW

Humidity63%

Visibility—

Dew point45°

Sun, 1560° / 49°

60 °

Portsmouth, Sunday, 15 November

Partly cloudy. High 60°, low 49°.

Pressure30.09 inHg

Wind7.8 mph SW

Humidity69%

Visibility—

Dew point48°

Mon, 1663° / 50°

63 °

Portsmouth, Monday, 16 November

Clear. High 63°, low 50°.

Pressure30.12 inHg

Wind12.8 mph S

Humidity61%

Visibility—

Dew point47°

Tue, 1761° / 49°

61 °

Portsmouth, Tuesday, 17 November

Mostly clear. High 61°, low 49°.

Pressure30.00 inHg

Wind19.4 mph S

Humidity55%

Visibility—

Dew point42°

Wed, 1854° / 44°

0.19

54 °

Portsmouth, Wednesday, 18 November

Light rain. High 54°, low 44°.

Pressure29.94 inHg

Wind15.9 mph S

Humidity64%

Visibility—

Dew point38°

Thu, 1950° / 37°

50 °

Portsmouth, Thursday, 19 November

Clear. High 50°, low 37°.

Pressure30.09 inHg

Wind8 mph NW

Humidity54%

Visibility—

Dew point31°

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.