As of 09:51 BST

Weather in Gwalchmai Uchaf

+11°

Gwalchmai Uchaf, Thursday, 8 October, 09:51

Overcast. Feels like 11°C. High 13°C, low 7°C.

Pressure1024 mb

Wind10 mph NW

Humidity82%

Visibility6.2 mi

Dew point8°C

Detailed hourly forecast

The month ahead in Gwalchmai Uchaf: daytime temperatures averaging +14.1° and +9.9° overnight — that is 0.8° above the climate average for October. Rain is expected on 7 days (around 53 mm), against a normal of 8 days and 48 mm. The warmest day should be 21 October (+17.5°), the coolest 17 October (+6.4°).

+14.1°/+9.9°

Average day / night

+0.8°

Above average

7 / 8

Wet days / normal

53 mm

Rainfall this month

Ten-day blocks against the climate average

Period	Forecast (day)	Average	Difference
8 October – 17 October	+13.6°	+13.7°	-0.1°
18 October – 27 October	+15°	+12.7°	+2.4°
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 (6.6 km away).

Fri, 09+11 ° /15 °

+15 °

Gwalchmai Uchaf, Friday, 9 October

Rain. High 15°C, low 11°C.

Pressure1009 mb

Wind21 mph W

Humidity76%

Visibility6.2 mi

Dew point10°C

Sat, 10+10 ° /13 °

2.7

+13 °

Gwalchmai Uchaf, Saturday, 10 October

Light rain. High 13°C, low 10°C.

Pressure1013 mb

Wind24 mph W

Humidity71%

Visibility4.5 mi

Dew point6°C

Sun, 11+10 ° /12 °

+12 °

Gwalchmai Uchaf, Sunday, 11 October

Partly cloudy. High 12°C, low 10°C.

Pressure1015 mb

Wind6 mph W

Humidity66%

Visibility6.2 mi

Dew point6°C

Mon, 12+11 ° /16 °

4.1

+16 °

Gwalchmai Uchaf, Monday, 12 October

Light rain. High 16°C, low 11°C.

Pressure1012 mb

Wind24 mph S

Humidity93%

Visibility—

Dew point14°C

Tue, 13+11 ° /16 °

5.1

+16 °

Gwalchmai Uchaf, Tuesday, 13 October

Light rain. High 16°C, low 11°C.

Pressure1018 mb

Wind27 mph SW

Humidity85%

Visibility—

Dew point13°C

Wed, 14+11 ° /15 °

0.2

+15 °

Gwalchmai Uchaf, Wednesday, 14 October

Light rain. High 15°C, low 11°C.

Pressure1020 mb

Wind21 mph S

Humidity83%

Visibility—

Dew point12°C

Thu, 15+9 ° /14 °

18.8

+14 °

Gwalchmai Uchaf, Thursday, 15 October

Rain. High 14°C, low 9°C.

Pressure1017 mb

Wind23 mph N

Humidity77%

Visibility—

Dew point7°C

Fri, 16+8 ° /11 °

+11 °

Gwalchmai Uchaf, Friday, 16 October

Clear sky. High 11°C, low 8°C.

Pressure1026 mb

Wind13 mph N

Humidity66%

Visibility—

Dew point5°C

Sat, 17+6 ° /10 °

0.3

+10 °

Gwalchmai Uchaf, Saturday, 17 October

Light rain. High 10°C, low 6°C.

Pressure1021 mb

Wind9 mph NE

Humidity71%

Visibility—

Dew point5°C

Sun, 18+7 ° /12 °

0.9

+12 °

Gwalchmai Uchaf, Sunday, 18 October

Light rain. High 12°C, low 7°C.

Pressure1015 mb

Wind8 mph S

Humidity77%

Visibility—

Dew point7°C

Mon, 19+11 ° /14 °

0.5

+14 °

Gwalchmai Uchaf, Monday, 19 October

Light rain. High 14°C, low 11°C.

Pressure1017 mb

Wind11 mph S

Humidity73%

Visibility—

Dew point9°C

Tue, 20+13 ° /16 °

1.1

+16 °

Gwalchmai Uchaf, Tuesday, 20 October

Light rain. High 16°C, low 13°C.

Pressure1017 mb

Wind11 mph SE

Humidity82%

Visibility—

Dew point13°C

Wed, 21+12 ° /18 °

+18 °

Gwalchmai Uchaf, Wednesday, 21 October

Overcast. High 18°C, low 12°C.

Pressure1015 mb

Wind12 mph SE

Humidity63%

Visibility—

Dew point10°C

Thu, 22+11 ° /16 °

+16 °

Gwalchmai Uchaf, Thursday, 22 October

Overcast. High 16°C, low 11°C.

Pressure1014 mb

Wind12 mph E

Humidity71%

Visibility—

Dew point10°C

Fri, 23+10 ° /14 °

+14 °

Gwalchmai Uchaf, Friday, 23 October

Overcast. High 14°C, low 10°C.

Pressure1019 mb

Wind15 mph NE

Humidity65%

Visibility—

Dew point7°C

Days 17 onward are based on 60-year climate statistics

Sat, 24+9 ° /13 °

3.7

+13 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 °

Gwalchmai Uchaf, 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 Gwalchmai Uchaf 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 Gwalchmai Uchaf 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.