As of 12:25 BST

Weather in St Mellons / Llaneurwg

+15°

St Mellons / Llaneurwg, Thursday, 8 October, 12:25

Overcast. Feels like 14°C. High 15°C, low 7°C.

Pressure1024 mb

Wind9 mph NW

Humidity67%

Visibility6.2 mi

Dew point9°C

Detailed hourly forecast

The month ahead in St Mellons / Llaneurwg: daytime temperatures averaging +14.6° and +9.7° overnight — that is 1.4° above the climate average for October. Rain is expected on 9 days (around 55 mm), against a normal of 7 days and 56 mm. The warmest day should be 13 October (+18.7°), the coolest 17 October (+5.8°).

+14.6°/+9.7°

Average day / night

+1.4°

Above average

9 / 7

Wet days / normal

55 mm

Rainfall this month

Ten-day blocks against the climate average

Period	Forecast (day)	Average	Difference
8 October – 17 October	+15.1°	+13.6°	+1.5°
18 October – 27 October	+13.8°	+12.5°	+1.3°
28 October – 6 November	near average	+11.3°	—

October records over 66 years

+22.9°1 October 2011All-time high

-1.4°25 October 2010All-time low

Climate averages and records are calculated from the nearest reference point — Thornhill (6.7 km away).

Fri, 09+11 ° /16 °

5.6

+16 °

St Mellons / Llaneurwg, Friday, 9 October

Rain. High 16°C, low 11°C.

Pressure1012 mb

Wind24 mph W

Humidity94%

Visibility2.5 mi

Dew point15°C

Sat, 10+9 ° /14 °

+14 °

St Mellons / Llaneurwg, Saturday, 10 October

Partly cloudy. High 14°C, low 9°C.

Pressure1016 mb

Wind14 mph W

Humidity60%

Visibility6.2 mi

Dew point6°C

Sun, 11+7 ° /14 °

+14 °

St Mellons / Llaneurwg, Sunday, 11 October

Overcast. High 14°C, low 7°C.

Pressure1014 mb

Wind3 mph SW

Humidity72%

Visibility6.2 mi

Dew point8°C

Mon, 12+11 ° /18 °

2.6

+18 °

St Mellons / Llaneurwg, Monday, 12 October

Light rain. High 18°C, low 11°C.

Pressure1013 mb

Wind11 mph S

Humidity93%

Visibility6.2 mi

Dew point16°C

Tue, 13+13 ° /19 °

3.1

+19 °

St Mellons / Llaneurwg, Tuesday, 13 October

Light rain. High 19°C, low 13°C.

Pressure1022 mb

Wind15 mph W

Humidity96%

Visibility—

Dew point17°C

Wed, 14+12 ° /16 °

+16 °

St Mellons / Llaneurwg, Wednesday, 14 October

Overcast. High 16°C, low 12°C.

Pressure1022 mb

Wind9 mph SW

Humidity67%

Visibility—

Dew point9°C

Thu, 15+9 ° /13 °

11.6

+13 °

St Mellons / Llaneurwg, Thursday, 15 October

Rain. High 13°C, low 9°C.

Pressure1022 mb

Wind24 mph N

Humidity56%

Visibility—

Dew point4°C

Fri, 16+8 ° /13 °

0.1

+13 °

St Mellons / Llaneurwg, Friday, 16 October

Light rain. High 13°C, low 8°C.

Pressure1024 mb

Wind8 mph N

Humidity55%

Visibility—

Dew point3°C

Sat, 17+6 ° /12 °

+12 °

St Mellons / Llaneurwg, Saturday, 17 October

Clear sky. High 12°C, low 6°C.

Pressure1017 mb

Wind13 mph NE

Humidity65%

Visibility—

Dew point4°C

Sun, 18+8 ° /13 °

1.4

+13 °

St Mellons / Llaneurwg, Sunday, 18 October

Light rain. High 13°C, low 8°C.

Pressure1015 mb

Wind14 mph N

Humidity74%

Visibility—

Dew point8°C

Mon, 19+11 ° /14 °

12.7

+14 °

St Mellons / Llaneurwg, Monday, 19 October

Rain. High 14°C, low 11°C.

Pressure1025 mb

Wind23 mph SE

Humidity65%

Visibility—

Dew point7°C

Tue, 20+10 ° /14 °

5.2

+14 °

St Mellons / Llaneurwg, Tuesday, 20 October

Light rain. High 14°C, low 10°C.

Pressure1018 mb

Wind22 mph E

Humidity83%

Visibility—

Dew point10°C

Wed, 21+12 ° /13 °

10.6

+13 °

St Mellons / Llaneurwg, Wednesday, 21 October

Rain. High 13°C, low 12°C.

Pressure1016 mb

Wind14 mph E

Humidity87%

Visibility—

Dew point11°C

Thu, 22+11 ° /15 °

0.6

+15 °

St Mellons / Llaneurwg, Thursday, 22 October

Light rain. High 15°C, low 11°C.

Pressure1023 mb

Wind6 mph NE

Humidity73%

Visibility—

Dew point10°C

Fri, 23+11 ° /14 °

+14 °

St Mellons / Llaneurwg, Friday, 23 October

Overcast. High 14°C, low 11°C.

Pressure1030 mb

Wind11 mph NE

Humidity72%

Visibility—

Dew point9°C

Days 17 onward are based on 60-year climate statistics

Sat, 24+8 ° /12 °

4.5

+12 °

St Mellons / Llaneurwg, Saturday, 24 October

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

Average high12°C

Average low8°C

Average rainfall4.5 mm

Chance of rain50%

Warmest on record+16° (1995)

Coldest on record+1° (2002)

Sun, 25+8 ° /12 °

3.5

+12 °

St Mellons / Llaneurwg, Sunday, 25 October

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

Average high12°C

Average low8°C

Average rainfall3.5 mm

Chance of rain55%

Warmest on record+16° (2013)

Coldest on record-1° (2010)

Mon, 26+8 ° /12 °

3.3

+12 °

St Mellons / Llaneurwg, Monday, 26 October

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

Average high12°C

Average low8°C

Average rainfall3.3 mm

Chance of rain52%

Warmest on record+17° (2005)

Coldest on record+2° (1997)

Tue, 27+8 ° /12 °

+12 °

St Mellons / Llaneurwg, Tuesday, 27 October

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

Average high12°C

Average low8°C

Average rainfall4 mm

Chance of rain50%

Warmest on record+19° (2022)

Coldest on record0° (1962)

Wed, 28+8 ° /12 °

4.4

+12 °

St Mellons / Llaneurwg, Wednesday, 28 October

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

Average high12°C

Average low8°C

Average rainfall4.4 mm

Chance of rain48%

Warmest on record+17° (2014)

Coldest on record+1° (2012)

Thu, 29+7 ° /12 °

+12 °

St Mellons / Llaneurwg, Thursday, 29 October

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

Average high12°C

Average low7°C

Average rainfall4 mm

Chance of rain47%

Warmest on record+17° (2022)

Coldest on record0° (2008)

Fri, 30+7 ° /12 °

4.1

+12 °

St Mellons / Llaneurwg, Friday, 30 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 rain55%

Warmest on record+17° (2001)

Coldest on record-1° (2018)

Sat, 31+8 ° /12 °

5.3

+12 °

St Mellons / Llaneurwg, Saturday, 31 October

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

Average high12°C

Average low8°C

Average rainfall5.3 mm

Chance of rain58%

Warmest on record+18° (2014)

Coldest on record-1° (1992)

Sun, 01+7 ° /12 °

3.9

+12 °

St Mellons / Llaneurwg, Sunday, 1 November

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

Average high12°C

Average low7°C

Average rainfall3.9 mm

Chance of rain52%

Warmest on record+16° (2014)

Coldest on record+1° (1988)

Mon, 02+7 ° /11 °

+11 °

St Mellons / Llaneurwg, Monday, 2 November

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

Average high11°C

Average low7°C

Average rainfall5 mm

Chance of rain57%

Warmest on record+16° (2005)

Coldest on record0° (2006)

Tue, 03+7 ° /11 °

3.4

+11 °

St Mellons / Llaneurwg, Tuesday, 3 November

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

Average high11°C

Average low7°C

Average rainfall3.4 mm

Chance of rain48%

Warmest on record+15° (2011)

Coldest on record-1° (2006)

Wed, 04+6 ° /11 °

2.8

+11 °

St Mellons / Llaneurwg, Wednesday, 4 November

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

Average high11°C

Average low6°C

Average rainfall2.8 mm

Chance of rain45%

Warmest on record+14° (1973)

Coldest on record-2° (2006)

Thu, 05+6 ° /11 °

2.9

+11 °

St Mellons / Llaneurwg, Thursday, 5 November

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

Average high11°C

Average low6°C

Average rainfall2.9 mm

Chance of rain37%

Warmest on record+15° (2025)

Coldest on record+1° (1988)

Fri, 06+6 ° /10 °

2.6

+10 °

St Mellons / Llaneurwg, Friday, 6 November

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

Average high10°C

Average low6°C

Average rainfall2.6 mm

Chance of rain45%

Warmest on record+15° (2015)

Coldest on record+1° (2006)

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 St Mellons / Llaneurwg 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 St Mellons / Llaneurwg 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.