As of 00:28 BST

Weather in Yr Arwydd

+9°

Yr Arwydd, Thursday, 8 October, 00:28

Mainly clear. Feels like 5°C. High 13°C, low 9°C.

Pressure1020 mb

Wind20 mph NW

Humidity86%

Visibility6.2 mi

Dew point6°C

Detailed hourly forecast

The month ahead in Yr Arwydd: daytime temperatures averaging +13.2° and +9.7° overnight — that is 0.2° below the climate average for October. Rain is expected on 13 days (around 80 mm), against a normal of 8 days and 48 mm. The warmest day should be 13 October (+16.9°), the coolest 23 October (+7.4°).

+13.2°/+9.7°

Average day / night

−0.2°

Below average

13 / 8

Wet days / normal

80 mm

Rainfall this month

Ten-day blocks against the climate average

Period	Forecast (day)	Average	Difference
8 October – 17 October	+14.2°	+13.7°	+0.5°
18 October – 27 October	+11.5°	+12.7°	-1.1°
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 (10.6 km away).

Fri, 09+13 ° /15 °

9.1

+15 °

Yr Arwydd, Friday, 9 October

Rain. High 15°C, low 13°C.

Pressure1009 mb

Wind22 mph W

Humidity80%

Visibility6.2 mi

Dew point10°C

Sat, 10+10 ° /13 °

+13 °

Yr Arwydd, Saturday, 10 October

Light rain. High 13°C, low 10°C.

Pressure1012 mb

Wind23 mph W

Humidity74%

Visibility5.0 mi

Dew point7°C

Sun, 11+9 ° /13 °

+13 °

Yr Arwydd, Sunday, 11 October

Overcast. High 13°C, low 9°C.

Pressure1015 mb

Wind9 mph W

Humidity71%

Visibility6.2 mi

Dew point7°C

Mon, 12+10 ° /17 °

3.1

+17 °

Yr Arwydd, Monday, 12 October

Light rain. High 17°C, low 10°C.

Pressure1011 mb

Wind25 mph S

Humidity87%

Visibility—

Dew point13°C

Tue, 13+10 ° /17 °

4.3

+17 °

Yr Arwydd, Tuesday, 13 October

Rain. High 17°C, low 10°C.

Pressure1019 mb

Wind26 mph SW

Humidity76%

Visibility—

Dew point11°C

Wed, 14+13 ° /16 °

+16 °

Yr Arwydd, Wednesday, 14 October

Overcast. High 16°C, low 13°C.

Pressure1023 mb

Wind22 mph S

Humidity82%

Visibility—

Dew point13°C

Thu, 15+9 ° /15 °

3.9

+15 °

Yr Arwydd, Thursday, 15 October

Rain. High 15°C, low 9°C.

Pressure1018 mb

Wind30 mph SW

Humidity66%

Visibility—

Dew point7°C

Fri, 16+8 ° /13 °

+13 °

Yr Arwydd, Friday, 16 October

Overcast. High 13°C, low 8°C.

Pressure1019 mb

Wind12 mph SW

Humidity61%

Visibility—

Dew point5°C

Sat, 17+9 ° /11 °

11.3

+11 °

Yr Arwydd, Saturday, 17 October

Rain. High 11°C, low 9°C.

Pressure1011 mb

Wind20 mph W

Humidity66%

Visibility—

Dew point5°C

Sun, 18+8 ° /11 °

2.3

+11 °

Yr Arwydd, Sunday, 18 October

Light rain. High 11°C, low 8°C.

Pressure1026 mb

Wind23 mph SW

Humidity59%

Visibility—

Dew point3°C

Mon, 19+12 ° /14 °

8.1

+14 °

Yr Arwydd, Monday, 19 October

Rain. High 14°C, low 12°C.

Pressure1008 mb

Wind24 mph SW

Humidity97%

Visibility—

Dew point14°C

Tue, 20+11 ° /15 °

+15 °

Yr Arwydd, Tuesday, 20 October

Light rain. High 15°C, low 11°C.

Pressure1011 mb

Wind25 mph SW

Humidity87%

Visibility—

Dew point12°C

Wed, 21+9 ° /10 °

3.7

+10 °

Yr Arwydd, Wednesday, 21 October

Light rain. High 10°C, low 9°C.

Pressure1008 mb

Wind25 mph W

Humidity77%

Visibility—

Dew point6°C

Thu, 22+8 ° /9 °

10.8

+9 °

Yr Arwydd, Thursday, 22 October

Light rain. High 9°C, low 8°C.

Pressure994 mb

Wind26 mph W

Humidity78%

Visibility—

Dew point5°C

Fri, 23+7 ° /9 °

+9 °

Yr Arwydd, Friday, 23 October

Rain. High 9°C, low 7°C.

Pressure1006 mb

Wind22 mph NW

Humidity69%

Visibility—

Dew point4°C

Days 17 onward are based on 60-year climate statistics

Sat, 24+9 ° /13 °

3.7

+13 °

Yr Arwydd, 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 °

Yr Arwydd, 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 °

Yr Arwydd, 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 °

Yr Arwydd, 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 °

Yr Arwydd, 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 °

Yr Arwydd, 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 °

Yr Arwydd, 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 °

Yr Arwydd, 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 °

Yr Arwydd, 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 °

Yr Arwydd, 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 °

Yr Arwydd, 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 °

Yr Arwydd, 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 °

Yr Arwydd, 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 °

Yr Arwydd, 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 Yr Arwydd 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 Yr Arwydd 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.