As of 14:50 BST

Weather in Bull Bay / Porthllechog

+13°

Bull Bay / Porthllechog, Thursday, 8 October, 14:50

Overcast. Feels like 12°C. High 15°C, low 10°C.

Pressure1022 mb

Wind16 mph SW

Humidity69%

Visibility6.2 mi

Dew point7°C

Detailed hourly forecast

The month ahead in Bull Bay / Porthllechog: daytime temperatures averaging +14° and +11.5° overnight — that is 0.7° above the climate average for October. Rain is expected on 8 days (around 50 mm), against a normal of 8 days and 48 mm. The warmest day should be 12 October (+16.8°), the coolest 16 October (+9.7°).

+14°/+11.5°

Average day / night

+0.7°

Above average

8 / 8

Wet days / normal

50 mm

Rainfall this month

Ten-day blocks against the climate average

Period	Forecast (day)	Average	Difference
8 October – 17 October	+14.3°	+13.7°	+0.7°
18 October – 27 October	+13.5°	+12.7°	+0.8°
28 October – 6 November	near average	+11.6°	—

October records over 66 years

+21.7°10 October 2018All-time high

-2.9°30 October 2018All-time low

Climate averages and records are calculated from the nearest reference point — Llangefni (18.6 km away).

Fri, 09+13 ° /15 °

11.5

+15 °

Bull Bay / Porthllechog, Friday, 9 October

Rain. High 15°C, low 13°C.

Pressure1008 mb

Wind24 mph W

Humidity76%

Visibility6.2 mi

Dew point9°C

Sat, 10+11 ° /13 °

3.3

+13 °

Bull Bay / Porthllechog, Saturday, 10 October

Light rain. High 13°C, low 11°C.

Pressure1013 mb

Wind26 mph W

Humidity79%

Visibility6.2 mi

Dew point8°C

Sun, 11+11 ° /13 °

+13 °

Bull Bay / Porthllechog, Sunday, 11 October

Overcast. High 13°C, low 11°C.

Pressure1013 mb

Wind5 mph W

Humidity65%

Visibility6.2 mi

Dew point6°C

Mon, 12+12 ° /17 °

0.7

+17 °

Bull Bay / Porthllechog, Monday, 12 October

Light rain. High 17°C, low 12°C.

Pressure1010 mb

Wind19 mph S

Humidity89%

Visibility5.6 mi

Dew point14°C

Tue, 13+15 ° /17 °

2.2

+17 °

Bull Bay / Porthllechog, Tuesday, 13 October

Light rain. High 17°C, low 15°C.

Pressure1019 mb

Wind28 mph S

Humidity80%

Visibility—

Dew point12°C

Wed, 14+10 ° /16 °

8.8

+16 °

Bull Bay / Porthllechog, Wednesday, 14 October

Rain. High 16°C, low 10°C.

Pressure1015 mb

Wind31 mph SW

Humidity82%

Visibility—

Dew point13°C

Thu, 15+10 ° /12 °

3.1

+12 °

Bull Bay / Porthllechog, Thursday, 15 October

Light rain. High 12°C, low 10°C.

Pressure1018 mb

Wind24 mph W

Humidity71%

Visibility—

Dew point7°C

Fri, 16+10 ° /13 °

0.2

+13 °

Bull Bay / Porthllechog, Friday, 16 October

Light rain. High 13°C, low 10°C.

Pressure1021 mb

Wind18 mph E

Humidity64%

Visibility—

Dew point5°C

Sat, 17+10 ° /14 °

2.4

+14 °

Bull Bay / Porthllechog, Saturday, 17 October

Light rain. High 14°C, low 10°C.

Pressure1020 mb

Wind17 mph E

Humidity67%

Visibility—

Dew point7°C

Sun, 18+13 ° /14 °

8.7

+14 °

Bull Bay / Porthllechog, Sunday, 18 October

Rain. High 14°C, low 13°C.

Pressure1020 mb

Wind25 mph S

Humidity82%

Visibility—

Dew point10°C

Mon, 19+12 ° /13 °

0.8

+13 °

Bull Bay / Porthllechog, Monday, 19 October

Light rain. High 13°C, low 12°C.

Pressure1031 mb

Wind22 mph N

Humidity80%

Visibility—

Dew point10°C

Tue, 20+11 ° /13 °

+13 °

Bull Bay / Porthllechog, Tuesday, 20 October

Overcast. High 13°C, low 11°C.

Pressure1033 mb

Wind7 mph E

Humidity68%

Visibility—

Dew point7°C

Wed, 21+11 ° /14 °

+14 °

Bull Bay / Porthllechog, Wednesday, 21 October

Overcast. High 14°C, low 11°C.

Pressure1018 mb

Wind13 mph E

Humidity85%

Visibility—

Dew point10°C

Thu, 22+13 ° /14 °

0.1

+14 °

Bull Bay / Porthllechog, Thursday, 22 October

Light rain. High 14°C, low 13°C.

Pressure1024 mb

Wind11 mph N

Humidity74%

Visibility—

Dew point10°C

Fri, 23+12 ° /13 °

0.2

+13 °

Bull Bay / Porthllechog, Friday, 23 October

Light rain. High 13°C, low 12°C.

Pressure1032 mb

Wind18 mph N

Humidity74%

Visibility—

Dew point8°C

Days 17 onward are based on 60-year climate statistics

Sat, 24+9 ° /13 °

3.7

+13 °

Bull Bay / Porthllechog, Saturday, 24 October

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

Average high13°C

Average low9°C

Average rainfall3.7 mm

Chance of rain47%

Warmest on record+18° (1995)

Coldest on record+3° (1987)

Sun, 25+9 ° /12 °

+12 °

Bull Bay / Porthllechog, Sunday, 25 October

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

Average high12°C

Average low9°C

Average rainfall4 mm

Chance of rain57%

Warmest on record+17° (2024)

Coldest on record+1° (2010)

Mon, 26+9 ° /12 °

2.8

+12 °

Bull Bay / Porthllechog, Monday, 26 October

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

Average high12°C

Average low9°C

Average rainfall2.8 mm

Chance of rain48%

Warmest on record+17° (2005)

Coldest on record+2° (1997)

Tue, 27+9 ° /13 °

+13 °

Bull Bay / Porthllechog, Tuesday, 27 October

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

Average high13°C

Average low9°C

Average rainfall4 mm

Chance of rain53%

Warmest on record+19° (2005)

Coldest on record+2° (1962)

Wed, 28+9 ° /12 °

3.9

+12 °

Bull Bay / Porthllechog, Wednesday, 28 October

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

Average high12°C

Average low9°C

Average rainfall3.9 mm

Chance of rain62%

Warmest on record+17° (2005)

Coldest on record+3° (1997)

Thu, 29+8 ° /12 °

3.2

+12 °

Bull Bay / Porthllechog, Thursday, 29 October

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

Average high12°C

Average low8°C

Average rainfall3.2 mm

Chance of rain52%

Warmest on record+18° (2022)

Coldest on record-1° (2018)

Fri, 30+8 ° /12 °

3.2

+12 °

Bull Bay / Porthllechog, Friday, 30 October

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

Average high12°C

Average low8°C

Average rainfall3.2 mm

Chance of rain55%

Warmest on record+16° (2005)

Coldest on record-3° (2018)

Sat, 31+9 ° /12 °

3.9

+12 °

Bull Bay / Porthllechog, Saturday, 31 October

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

Average high12°C

Average low9°C

Average rainfall3.9 mm

Chance of rain63%

Warmest on record+18° (2014)

Coldest on record-1° (1988)

Sun, 01+8 ° /12 °

4.4

+12 °

Bull Bay / Porthllechog, Sunday, 1 November

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

Average high12°C

Average low8°C

Average rainfall4.4 mm

Chance of rain58%

Warmest on record+15° (2020)

Coldest on record+1° (1988)

Mon, 02+8 ° /12 °

4.6

+12 °

Bull Bay / Porthllechog, Monday, 2 November

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

Average high12°C

Average low8°C

Average rainfall4.6 mm

Chance of rain60%

Warmest on record+16° (2005)

Coldest on record+1° (1986)

Tue, 03+8 ° /11 °

3.9

+11 °

Bull Bay / Porthllechog, Tuesday, 3 November

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

Average high11°C

Average low8°C

Average rainfall3.9 mm

Chance of rain62%

Warmest on record+16° (2011)

Coldest on record0° (2006)

Wed, 04+7 ° /11 °

2.6

+11 °

Bull Bay / Porthllechog, Wednesday, 4 November

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

Average high11°C

Average low7°C

Average rainfall2.6 mm

Chance of rain55%

Warmest on record+15° (2010)

Coldest on record+0° (1968)

Thu, 05+7 ° /11 °

3.7

+11 °

Bull Bay / Porthllechog, Thursday, 5 November

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

Average high11°C

Average low7°C

Average rainfall3.7 mm

Chance of rain57%

Warmest on record+17° (2025)

Coldest on record+2° (1965)

Fri, 06+8 ° /11 °

2.6

+11 °

Bull Bay / Porthllechog, Friday, 6 November

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

Average high11°C

Average low8°C

Average rainfall2.6 mm

Chance of rain50%

Warmest on record+17° (2025)

Coldest on record+3° (1987)

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 Bull Bay / Porthllechog 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 Bull Bay / Porthllechog 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.