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As of 02:54 CDT

Weather in Portsmouth, IA

75°Current weather

Portsmouth, Sunday, 9 August, 02:54

Mostly clear. Feels like 77°. High 93°, low 74°.

Pressure29.83 inHg
Wind14.5 mph S
Humidity86%
Visibility6.2 mi
Dew point71°
Mon, 1087° / 72°0Overcast
87 °Overcast

Portsmouth, Monday, 10 August

Overcast. High 87°, low 72°.

Pressure29.85 inHg
Wind14.4 mph E
Humidity61%
Visibility6.2 mi
Dew point69°
Tue, 1199° / 71°0Mostly clear
99 °Mostly clear

Portsmouth, Tuesday, 11 August

Mostly clear. High 99°, low 71°.

Pressure29.71 inHg
Wind6.1 mph SW
Humidity32%
Visibility6.2 mi
Dew point60°
Wed, 1290° / 69°0.04Light rain
90 °Light rain

Portsmouth, Wednesday, 12 August

Light rain. High 90°, low 69°.

Pressure29.88 inHg
Wind8.5 mph SE
Humidity76%
Visibility6.2 mi
Dew point71°
Thu, 1373° / 62°0.48Rain
73 °Rain

Portsmouth, Thursday, 13 August

Rain. High 73°, low 62°.

Pressure30.03 inHg
Wind21.5 mph E
Humidity93%
Visibility—
Dew point62°
Fri, 1466° / 61°0.18Light rain
66 °Light rain

Portsmouth, Friday, 14 August

Light rain. High 66°, low 61°.

Pressure30.09 inHg
Wind14.9 mph E
Humidity97%
Visibility—
Dew point62°
Sat, 1569° / 60°0.02Light rain
69 °Light rain

Portsmouth, Saturday, 15 August

Light rain. High 69°, low 60°.

Pressure30.12 inHg
Wind8.7 mph E
Humidity87%
Visibility—
Dew point63°
Sun, 1687° / 63°0Light rain
87 °Light rain

Portsmouth, Sunday, 16 August

Light rain. High 87°, low 63°.

Pressure30.12 inHg
Wind10 mph N
Humidity58%
Visibility—
Dew point63°
Mon, 1786° / 66°0Overcast
86 °Overcast

Portsmouth, Monday, 17 August

Overcast. High 86°, low 66°.

Pressure30.03 inHg
Wind11.9 mph SE
Humidity49%
Visibility—
Dew point62°
Tue, 1897° / 67°0Overcast
97 °Overcast

Portsmouth, Tuesday, 18 August

Overcast. High 97°, low 67°.

Pressure29.83 inHg
Wind14.7 mph SE
Humidity50%
Visibility—
Dew point66°
Wed, 19101° / 71°0.01Light rain
101 °Light rain

Portsmouth, Wednesday, 19 August

Light rain. High 101°, low 71°.

Pressure29.74 inHg
Wind14.2 mph E
Humidity32%
Visibility—
Dew point56°
Thu, 20105° / 73°0Partly cloudy
105 °Partly cloudy

Portsmouth, Thursday, 20 August

Partly cloudy. High 105°, low 73°.

Pressure29.77 inHg
Wind22.3 mph NE
Humidity32%
Visibility—
Dew point61°
Fri, 2193° / 69°0.04Light rain
93 °Light rain

Portsmouth, Friday, 21 August

Light rain. High 93°, low 69°.

Pressure29.88 inHg
Wind19.2 mph E
Humidity34%
Visibility—
Dew point54°
Sat, 22114° / 71°0Clear
114 °Clear

Portsmouth, Saturday, 22 August

Clear. High 114°, low 71°.

Pressure29.68 inHg
Wind21.5 mph SW
Humidity15%
Visibility—
Dew point46°
Sun, 2394° / 75°0.02Light rain
94 °Light rain

Portsmouth, Sunday, 23 August

Light rain. High 94°, low 75°.

Pressure29.80 inHg
Wind17.2 mph NE
Humidity36%
Visibility—
Dew point61°
Mon, 2497° / 71°0.02Light rain
97 °Light rain

Portsmouth, Monday, 24 August

Light rain. High 97°, low 71°.

Pressure29.91 inHg
Wind14.6 mph SE
Humidity41%
Visibility—
Dew point63°

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.