As of 00:27 BST

Weather in Portsmouth

+6°

Portsmouth, Thursday, 8 October, 00:27

Clear sky. Feels like 3°C. High 13°C, low 5°C.

Pressure1017 mb

Wind9 mph NW

Humidity94%

Visibility6.2 mi

Dew point5°C

Detailed hourly forecast

The month ahead in Portsmouth: daytime temperatures averaging +11.2° and +5.7° overnight — that is 1.4° below the climate average for October. Rain is expected on 10 days (around 66 mm), against a normal of 7 days and 45 mm. The warmest day should be 13 October (+15.6°), the coolest 23 October (+0.9°).

+11.2°/+5.7°

Average day / night

−1.4°

Below average

10 / 7

Wet days / normal

66 mm

Rainfall this month

Ten-day blocks against the climate average

Period	Forecast (day)	Average	Difference
8 October – 17 October	+12.5°	+13.1°	-0.6°
18 October – 27 October	+9.1°	+11.8°	-2.7°
28 October – 6 November	near average	+10.6°	—

October records over 66 years

+24.4°1 October 2011All-time high

-3.1°17 October 1993All-time low

Climate averages and records are calculated from the nearest reference point — Todmorden (4 km away).

Fri, 09+8 ° /13 °

20.3

+13 °

Portsmouth, Friday, 9 October

Rain. High 13°C, low 8°C.

Pressure1006 mb

Wind16 mph W

Humidity94%

Visibility6.2 mi

Dew point11°C

Sat, 10+7 ° /10 °

4.7

+10 °

Portsmouth, Saturday, 10 October

Light rain. High 10°C, low 7°C.

Pressure1009 mb

Wind21 mph W

Humidity70%

Visibility6.2 mi

Dew point5°C

Sun, 11+6 ° /11 °

0.2

+11 °

Portsmouth, Sunday, 11 October

Light rain. High 11°C, low 6°C.

Pressure1013 mb

Wind10 mph NW

Humidity76%

Visibility6.2 mi

Dew point6°C

Mon, 12+5 ° /14 °

+14 °

Portsmouth, Monday, 12 October

Light rain. High 14°C, low 5°C.

Pressure1015 mb

Wind16 mph S

Humidity87%

Visibility—

Dew point9°C

Tue, 13+7 ° /16 °

1.9

+16 °

Portsmouth, Tuesday, 13 October

Light rain. High 16°C, low 7°C.

Pressure1018 mb

Wind16 mph SW

Humidity92%

Visibility—

Dew point12°C

Wed, 14+6 ° /15 °

+15 °

Portsmouth, Wednesday, 14 October

Overcast. High 15°C, low 6°C.

Pressure1024 mb

Wind12 mph SW

Humidity74%

Visibility—

Dew point9°C

Thu, 15+6 ° /12 °

1.5

+12 °

Portsmouth, Thursday, 15 October

Light rain. High 12°C, low 6°C.

Pressure1016 mb

Wind19 mph SW

Humidity85%

Visibility—

Dew point7°C

Fri, 16+5 ° /11 °

+11 °

Portsmouth, Friday, 16 October

Overcast. High 11°C, low 5°C.

Pressure1019 mb

Wind9 mph SW

Humidity61%

Visibility—

Dew point3°C

Sat, 17+6 ° /9 °

12.2

+9 °

Portsmouth, Saturday, 17 October

Rain. High 9°C, low 6°C.

Pressure1008 mb

Wind21 mph W

Humidity82%

Visibility—

Dew point6°C

Sun, 18+3 ° /9 °

0.7

+9 °

Portsmouth, Sunday, 18 October

Light rain. High 9°C, low 3°C.

Pressure1024 mb

Wind17 mph W

Humidity66%

Visibility—

Dew point2°C

Mon, 19+9 ° /12 °

6.8

+12 °

Portsmouth, Monday, 19 October

Light rain. High 12°C, low 9°C.

Pressure1006 mb

Wind21 mph SW

Humidity98%

Visibility—

Dew point11°C

Tue, 20+8 ° /13 °

3.5

+13 °

Portsmouth, Tuesday, 20 October

Light rain. High 13°C, low 8°C.

Pressure1009 mb

Wind31 mph W

Humidity92%

Visibility—

Dew point11°C

Wed, 21+7 ° /8 °

0.8

+8 °

Portsmouth, Wednesday, 21 October

Light rain. High 8°C, low 7°C.

Pressure1003 mb

Wind29 mph W

Humidity64%

Visibility—

Dew point2°C

Thu, 22+3 ° /6 °

11.2

+6 °

Portsmouth, Thursday, 22 October

Rain. High 6°C, low 3°C.

Pressure991 mb

Wind20 mph W

Humidity83%

Visibility—

Dew point4°C

Fri, 23+1 ° /6 °

0.1

+6 °

Portsmouth, Friday, 23 October

Light rain. High 6°C, low 1°C.

Pressure1003 mb

Wind17 mph N

Humidity67%

Visibility—

Dew point0°C

Days 17 onward are based on 60-year climate statistics

Sat, 24+7 ° /12 °

3.3

+12 °

Portsmouth, Saturday, 24 October

Climate average for this date — the mean of the last 60 years.

Average high12°C

Average low7°C

Average rainfall3.3 mm

Chance of rain50%

Warmest on record+18° (1995)

Coldest on record-2° (1964)

Sun, 25+7 ° /12 °

4.1

+12 °

Portsmouth, Sunday, 25 October

Climate average for this date — the mean of the last 60 years.

Average high12°C

Average low7°C

Average rainfall4.1 mm

Chance of rain50%

Warmest on record+16° (2013)

Coldest on record0° (2003)

Mon, 26+7 ° /11 °

+11 °

Portsmouth, Monday, 26 October

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low7°C

Average rainfall3 mm

Chance of rain52%

Warmest on record+16° (2005)

Coldest on record-1° (1981)

Tue, 27+7 ° /12 °

4.1

+12 °

Portsmouth, Tuesday, 27 October

Climate average for this date — the mean of the last 60 years.

Average high12°C

Average low7°C

Average rainfall4.1 mm

Chance of rain57%

Warmest on record+19° (2005)

Coldest on record-2° (1962)

Wed, 28+6 ° /11 °

3.7

+11 °

Portsmouth, Wednesday, 28 October

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low6°C

Average rainfall3.7 mm

Chance of rain52%

Warmest on record+17° (2014)

Coldest on record-2° (2008)

Thu, 29+6 ° /11 °

2.7

+11 °

Portsmouth, Thursday, 29 October

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low6°C

Average rainfall2.7 mm

Chance of rain47%

Warmest on record+16° (1984)

Coldest on record-3° (2008)

Fri, 30+6 ° /11 °

2.5

+11 °

Portsmouth, Friday, 30 October

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low6°C

Average rainfall2.5 mm

Chance of rain43%

Warmest on record+17° (2001)

Coldest on record-2° (1988)

Sat, 31+7 ° /11 °

3.2

+11 °

Portsmouth, Saturday, 31 October

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low7°C

Average rainfall3.2 mm

Chance of rain55%

Warmest on record+19° (2014)

Coldest on record-3° (1974)

Sun, 01+6 ° /11 °

3.9

+11 °

Portsmouth, Sunday, 1 November

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low6°C

Average rainfall3.9 mm

Chance of rain52%

Warmest on record+16° (2014)

Coldest on record-1° (1966)

Mon, 02+6 ° /11 °

4.8

+11 °

Portsmouth, Monday, 2 November

Climate average for this date — the mean of the last 60 years.

Average high11°C

Average low6°C

Average rainfall4.8 mm

Chance of rain62%

Warmest on record+16° (2005)

Coldest on record-1° (1986)

Tue, 03+6 ° /10 °

3.5

+10 °

Portsmouth, Tuesday, 3 November

Climate average for this date — the mean of the last 60 years.

Average high10°C

Average low6°C

Average rainfall3.5 mm

Chance of rain60%

Warmest on record+16° (1979)

Coldest on record-3° (1985)

Wed, 04+5 ° /10 °

2.5

+10 °

Portsmouth, Wednesday, 4 November

Climate average for this date — the mean of the last 60 years.

Average high10°C

Average low5°C

Average rainfall2.5 mm

Chance of rain48%

Warmest on record+15° (1971)

Coldest on record-2° (1965)

Thu, 05+5 ° /10 °

+10 °

Portsmouth, Thursday, 5 November

Climate average for this date — the mean of the last 60 years.

Average high10°C

Average low5°C

Average rainfall3 mm

Chance of rain53%

Warmest on record+16° (2025)

Coldest on record-2° (1968)

Fri, 06+5 ° /10 °

2.5

+10 °

Portsmouth, Friday, 6 November

Climate average for this date — the mean of the last 60 years.

Average high10°C

Average low5°C

Average rainfall2.5 mm

Chance of rain43%

Warmest on record+16° (1972)

Coldest on record-1° (1995)

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 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 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.