As of 20:27 BST

Weather in Old Portsmouth

+21°Weather now

Old Portsmouth, Saturday, 8 August, 20:27

Overcast. Feels like 21°C. High 27°C, low 11°C.

Pressure1016 mb
Wind3 mph E
Humidity55%
Visibility6.2 mi
Dew point12°C
Sun, 09+14 ° /29 °0Partly cloudy
+29 °Partly cloudy

Old Portsmouth, Sunday, 9 August

Partly cloudy. High 29°C, low 14°C.

Pressure1013 mb
Wind5 mph SW
Humidity36%
Visibility6.2 mi
Dew point8°C
Mon, 10+11 ° /27 °0Overcast
+27 °Overcast

Old Portsmouth, Monday, 10 August

Overcast. High 27°C, low 11°C.

Pressure1020 mb
Wind7 mph N
Humidity55%
Visibility6.2 mi
Dew point13°C
Tue, 11+17 ° /23 °0Clear sky
+23 °Clear sky

Old Portsmouth, Tuesday, 11 August

Clear sky. High 23°C, low 17°C.

Pressure1024 mb
Wind17 mph E
Humidity52%
Visibility6.2 mi
Dew point10°C
Wed, 12+18 ° /25 °0Partly cloudy
+25 °Partly cloudy

Old Portsmouth, Wednesday, 12 August

Partly cloudy. High 25°C, low 18°C.

Pressure1023 mb
Wind15 mph SE
Humidity49%
Visibility6.2 mi
Dew point11°C
Thu, 13+20 ° /27 °0Clear sky
+27 °Clear sky

Old Portsmouth, Thursday, 13 August

Clear sky. High 27°C, low 20°C.

Pressure1019 mb
Wind13 mph SE
Humidity47%
Visibility—
Dew point13°C
Fri, 14+19 ° /27 °0Overcast
+27 °Overcast

Old Portsmouth, Friday, 14 August

Overcast. High 27°C, low 19°C.

Pressure1016 mb
Wind18 mph SW
Humidity50%
Visibility—
Dew point15°C
Sat, 15+18 ° /26 °0Partly cloudy
+26 °Partly cloudy

Old Portsmouth, Saturday, 15 August

Partly cloudy. High 26°C, low 18°C.

Pressure1014 mb
Wind17 mph SW
Humidity51%
Visibility—
Dew point14°C
Sun, 16+17 ° /22 °1Light rain
+22 °Light rain

Old Portsmouth, Sunday, 16 August

Light rain. High 22°C, low 17°C.

Pressure1017 mb
Wind10 mph NE
Humidity64%
Visibility—
Dew point14°C
Mon, 17+18 ° /20 °0.8Light rain
+20 °Light rain

Old Portsmouth, Monday, 17 August

Light rain. High 20°C, low 18°C.

Pressure1016 mb
Wind20 mph SW
Humidity74%
Visibility—
Dew point14°C
Tue, 18+17 ° /25 °0Clear sky
+25 °Clear sky

Old Portsmouth, Tuesday, 18 August

Clear sky. High 25°C, low 17°C.

Pressure1013 mb
Wind19 mph W
Humidity47%
Visibility—
Dew point11°C
Wed, 19+14 ° /22 °0Partly cloudy
+22 °Partly cloudy

Old Portsmouth, Wednesday, 19 August

Partly cloudy. High 22°C, low 14°C.

Pressure1015 mb
Wind18 mph SW
Humidity43%
Visibility—
Dew point7°C
Thu, 20+16 ° /22 °1.2Light rain
+22 °Light rain

Old Portsmouth, Thursday, 20 August

Light rain. High 22°C, low 16°C.

Pressure1007 mb
Wind22 mph SW
Humidity73%
Visibility—
Dew point16°C
Fri, 21+13 ° /22 °0Mainly clear
+22 °Mainly clear

Old Portsmouth, Friday, 21 August

Mainly clear. High 22°C, low 13°C.

Pressure1013 mb
Wind18 mph NW
Humidity44%
Visibility—
Dew point7°C
Sat, 22+15 ° /22 °0Overcast
+22 °Overcast

Old Portsmouth, Saturday, 22 August

Overcast. High 22°C, low 15°C.

Pressure1015 mb
Wind24 mph W
Humidity53%
Visibility—
Dew point11°C
Sun, 23+13 ° /22 °0Overcast
+22 °Overcast

Old Portsmouth, Sunday, 23 August

Overcast. High 22°C, low 13°C.

Pressure1021 mb
Wind20 mph NW
Humidity40%
Visibility—
Dew point5°C

Questions about the month ahead

How accurate is a month-long forecast?

The first 16 days come from weather models — highly reliable for the first 3–5 days, gradually less so after that. Days 17 to 30 for Old Portsmouth are built from climate averages over the last 60 years, so they show typical weather for those dates rather than a specific forecast.

What does "above average" mean?

We compare the forecast with the climate average for exactly the same calendar days, calculated from 60 years of observations. The difference shows how the coming month compares with a typical one.

Where do the 66-year records come from?

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

How often is the 30-day forecast updated?

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