As of 11:05 BST

Weather in Pen-y-groeslon

+12°

Pen-y-groeslon, Thursday, 8 October, 11:05

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

Pressure1023 mb

Wind13 mph NW

Humidity77%

Visibility6.2 mi

Dew point8°C

Detailed hourly forecast

The month ahead in Pen-y-groeslon: daytime temperatures averaging +13.6° and +11.3° overnight — that is 0.2° above the climate average for October. Rain is expected on 8 days (around 44 mm), against a normal of 10 days and 74 mm. The warmest day should be 13 October (+16.2°), the coolest 8 October (+7.2°).

+13.6°/+11.3°

Average day / night

+0.2°

Above average

8 / 10

Wet days / normal

44 mm

Rainfall this month

Ten-day blocks against the climate average

Period	Forecast (day)	Average	Difference
8 October – 17 October	+13.6°	+13.6°	-0°
18 October – 27 October	+13.5°	+12.8°	+0.7°
28 October – 6 November	near average	+11.8°	—

October records over 66 years

+20.3°10 October 2018All-time high

+1.7°30 October 2018All-time low

Climate averages and records are calculated from the nearest reference point — Pwllheli (16.8 km away).

Fri, 09+12 ° /15 °

5.3

+15 °

Pen-y-groeslon, Friday, 9 October

Light rain. High 15°C, low 12°C.

Pressure1010 mb

Wind24 mph NW

Humidity82%

Visibility6.2 mi

Dew point11°C

Sat, 10+11 ° /13 °

2.5

+13 °

Pen-y-groeslon, Saturday, 10 October

Light rain. High 13°C, low 11°C.

Pressure1015 mb

Wind24 mph W

Humidity73%

Visibility6.2 mi

Dew point7°C

Sun, 11+11 ° /13 °

+13 °

Pen-y-groeslon, Sunday, 11 October

Overcast. High 13°C, low 11°C.

Pressure1013 mb

Wind7 mph SW

Humidity74%

Visibility6.2 mi

Dew point8°C

Mon, 12+13 ° /16 °

3.2

+16 °

Pen-y-groeslon, Monday, 12 October

Light rain. High 16°C, low 13°C.

Pressure1011 mb

Wind21 mph SE

Humidity96%

Visibility—

Dew point15°C

Tue, 13+14 ° /16 °

0.7

+16 °

Pen-y-groeslon, Tuesday, 13 October

Light rain. High 16°C, low 14°C.

Pressure1021 mb

Wind26 mph SW

Humidity83%

Visibility—

Dew point12°C

Wed, 14+11 ° /15 °

11.6

+15 °

Pen-y-groeslon, Wednesday, 14 October

Rain. High 15°C, low 11°C.

Pressure1018 mb

Wind29 mph S

Humidity88%

Visibility—

Dew point13°C

Thu, 15+11 ° /12 °

5.1

+12 °

Pen-y-groeslon, Thursday, 15 October

Rain. High 12°C, low 11°C.

Pressure1024 mb

Wind23 mph NW

Humidity73%

Visibility—

Dew point7°C

Fri, 16+11 ° /11 °

0.9

+11 °

Pen-y-groeslon, Friday, 16 October

Light rain. High 11°C, low 11°C.

Pressure1024 mb

Wind22 mph NW

Humidity69%

Visibility—

Dew point6°C

Sat, 17+9 ° /11 °

0.2

+11 °

Pen-y-groeslon, Saturday, 17 October

Light rain. High 11°C, low 9°C.

Pressure1017 mb

Wind15 mph SE

Humidity58%

Visibility—

Dew point2°C

Sun, 18+11 ° /13 °

0.2

+13 °

Pen-y-groeslon, Sunday, 18 October

Light rain. High 13°C, low 11°C.

Pressure1018 mb

Wind20 mph N

Humidity69%

Visibility—

Dew point7°C

Mon, 19+12 ° /14 °

0.2

+14 °

Pen-y-groeslon, Monday, 19 October

Light rain. High 14°C, low 12°C.

Pressure1027 mb

Wind27 mph NE

Humidity72%

Visibility—

Dew point9°C

Tue, 20+11 ° /14 °

1.1

+14 °

Pen-y-groeslon, Tuesday, 20 October

Light rain. High 14°C, low 11°C.

Pressure1020 mb

Wind22 mph E

Humidity77%

Visibility—

Dew point9°C

Wed, 21+12 ° /14 °

4.2

+14 °

Pen-y-groeslon, Wednesday, 21 October

Light rain. High 14°C, low 12°C.

Pressure1017 mb

Wind13 mph E

Humidity79%

Visibility—

Dew point9°C

Thu, 22+13 ° /14 °

+14 °

Pen-y-groeslon, Thursday, 22 October

Overcast. High 14°C, low 13°C.

Pressure1024 mb

Wind14 mph N

Humidity81%

Visibility—

Dew point10°C

Fri, 23+12 ° /13 °

0.5

+13 °

Pen-y-groeslon, Friday, 23 October

Light rain. High 13°C, low 12°C.

Pressure1032 mb

Wind22 mph N

Humidity77%

Visibility—

Dew point8°C

Days 17 onward are based on 60-year climate statistics

Sat, 24+10 ° /13 °

5.7

+13 °

Pen-y-groeslon, Saturday, 24 October

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

Average high13°C

Average low10°C

Average rainfall5.7 mm

Chance of rain65%

Warmest on record+17° (1995)

Coldest on record+5° (1987)

Sun, 25+10 ° /13 °

6.6

+13 °

Pen-y-groeslon, Sunday, 25 October

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

Average high13°C

Average low10°C

Average rainfall6.6 mm

Chance of rain67%

Warmest on record+16° (2006)

Coldest on record+5° (2010)

Mon, 26+10 ° /13 °

4.8

+13 °

Pen-y-groeslon, Monday, 26 October

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

Average high13°C

Average low10°C

Average rainfall4.8 mm

Chance of rain67%

Warmest on record+16° (2005)

Coldest on record+5° (2012)

Tue, 27+10 ° /13 °

6.7

+13 °

Pen-y-groeslon, Tuesday, 27 October

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

Average high13°C

Average low10°C

Average rainfall6.7 mm

Chance of rain62%

Warmest on record+18° (2005)

Coldest on record+5° (2012)

Wed, 28+10 ° /12 °

6.4

+12 °

Pen-y-groeslon, Wednesday, 28 October

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

Average high12°C

Average low10°C

Average rainfall6.4 mm

Chance of rain65%

Warmest on record+17° (2005)

Coldest on record+4° (2008)

Thu, 29+9 ° /12 °

4.6

+12 °

Pen-y-groeslon, Thursday, 29 October

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

Average high12°C

Average low9°C

Average rainfall4.6 mm

Chance of rain62%

Warmest on record+17° (2022)

Coldest on record+3° (2018)

Fri, 30+9 ° /12 °

5.5

+12 °

Pen-y-groeslon, Friday, 30 October

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

Average high12°C

Average low9°C

Average rainfall5.5 mm

Chance of rain68%

Warmest on record+16° (2005)

Coldest on record+2° (2018)

Sat, 31+10 ° /12 °

6.4

+12 °

Pen-y-groeslon, Saturday, 31 October

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

Average high12°C

Average low10°C

Average rainfall6.4 mm

Chance of rain67%

Warmest on record+18° (2014)

Coldest on record+4° (1988)

Sun, 01+9 ° /12 °

+12 °

Pen-y-groeslon, Sunday, 1 November

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

Average high12°C

Average low9°C

Average rainfall7 mm

Chance of rain68%

Warmest on record+15° (2020)

Coldest on record+4° (1988)

Mon, 02+9 ° /12 °

6.8

+12 °

Pen-y-groeslon, Monday, 2 November

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

Average high12°C

Average low9°C

Average rainfall6.8 mm

Chance of rain67%

Warmest on record+15° (2005)

Coldest on record+4° (1986)

Tue, 03+9 ° /11 °

6.8

+11 °

Pen-y-groeslon, Tuesday, 3 November

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

Average high11°C

Average low9°C

Average rainfall6.8 mm

Chance of rain72%

Warmest on record+15° (2011)

Coldest on record+2° (1980)

Wed, 04+9 ° /11 °

4.8

+11 °

Pen-y-groeslon, Wednesday, 4 November

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

Average high11°C

Average low9°C

Average rainfall4.8 mm

Chance of rain65%

Warmest on record+14° (2010)

Coldest on record+4° (1988)

Thu, 05+9 ° /11 °

5.4

+11 °

Pen-y-groeslon, Thursday, 5 November

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

Average high11°C

Average low9°C

Average rainfall5.4 mm

Chance of rain58%

Warmest on record+15° (2025)

Coldest on record+5° (1965)

Fri, 06+9 ° /11 °

4.2

+11 °

Pen-y-groeslon, Friday, 6 November

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

Average high11°C

Average low9°C

Average rainfall4.2 mm

Chance of rain58%

Warmest on record+15° (2025)

Coldest on record+5° (1990)

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 Pen-y-groeslon 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 Pen-y-groeslon 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.