When to go

Anglesey: month by month

Average temperature, rainfall, sunshine and daylight for each month, what to pack, and the bank holidays that can change crowds and prices. Averages are Met Office 1991-2020 figures, not a forecast.

Anglesey guide · Rainy-day ideas in Anglesey

Anglesey climate by month

Warmest month: July (highs about 19°C). Coolest: January (about 8°C). Wettest: November (103 mm). Driest: May (52 mm).

Station: Valley. Mean daily maximum and minimum, rainfall, days with 1 mm or more, sunshine hours and day length.
MonthMax °CMin °CRain mmRain daysSun hoursDaylight
January8.43.87514618 h 02
February8.43.66212859 h 41
March9.84.5571113211 h 50
April12.16.1541118213 h 58
May15.08.652923315 h 57
June17.211.057921916 h 58
July18.812.9571120516 h 24
August18.813.1691118814 h 42
September17.311.6741115112 h 31
October14.39.21021410810 h 23
November11.36.610316638 h 31
December9.14.49316487 h 32

Source: Met Office, Valley, 1991-2020 averages (Open Government Licence v3.0). Daylight is calculated from the latitude of Anglesey for the 15th of each month. Met Office climate station named Valley (RAF Valley, west Anglesey), found by the geohash of Holyhead town centre; Beaumaris and the Menai Strait are about 30 km east.

Pick a month

Choose a month for what to expect, what to pack and the bank holidays. Without JavaScript every month is listed below.

January in Anglesey

4–8°CTypical night to day
75 mmRain, 14 days
8 h 02Daylight
61 hSunshine in the month

What to expect

  • Days average 8.4°C at the warmest and nights 3.8°C at the coolest.
  • About 75 mm of rain falls over roughly 14 days with 1 mm or more.
  • Expect about 61 hours of sunshine in the month and 8 h 02 of daylight in the middle of the month.
  • This is the coolest month on average.

Planning

  • Short days (about 8 h 02 of daylight): plan outdoor sights for the middle of the day and keep evenings for museums, food and shows.
  • Averaging about 61 hours of sunshine in the month, so keep an indoor back-up for each day (see our rainy-day guide).

What to pack

  • A warm coat, hat and gloves, with thermal or wool layers underneath.
  • A proper waterproof jacket and shoes that cope with wet pavements: this is one of the wetter months here (14 days with 1 mm or more).
  • Comfortable walking shoes: most sights are best reached on foot.

Bank holidays in Jan

  • Fri, 1 Jan 2027: New Year’s Day
  • Mon, 3 Jan 2028: New Year’s Day

February in Anglesey

4–8°CTypical night to day
62 mmRain, 12 days
9 h 41Daylight
85 hSunshine in the month

What to expect

  • Days average 8.4°C at the warmest and nights 3.6°C at the coolest.
  • About 62 mm of rain falls over roughly 12 days with 1 mm or more.
  • Expect about 85 hours of sunshine in the month and 9 h 41 of daylight in the middle of the month.

Planning

  • About 9 h 41 of daylight: enough for a full day out, but check sunset if you plan a viewpoint or a long walk.

What to pack

  • A warm coat, hat and gloves, with thermal or wool layers underneath.
  • A light waterproof or a compact umbrella: about 12 days a month see 1 mm or more.
  • Comfortable walking shoes: most sights are best reached on foot.

Bank holidays in Feb

No bank holidays in Wales in February for the next two years.

March in Anglesey

5–10°CTypical night to day
57 mmRain, 11 days
11 h 50Daylight
132 hSunshine in the month

What to expect

  • Days average 9.8°C at the warmest and nights 4.5°C at the coolest.
  • About 57 mm of rain falls over roughly 11 days with 1 mm or more.
  • Expect about 132 hours of sunshine in the month and 11 h 50 of daylight in the middle of the month.

Planning

  • About 11 h 50 of daylight: enough for a full day out, but check sunset if you plan a viewpoint or a long walk.

What to pack

  • A warm coat, hat and gloves, with thermal or wool layers underneath.
  • A light waterproof or a compact umbrella: about 11 days a month see 1 mm or more.
  • Comfortable walking shoes: most sights are best reached on foot.

Bank holidays in Mar

  • Fri, 26 Mar 2027: Good Friday
  • Mon, 29 Mar 2027: Easter Monday

April in Anglesey

6–12°CTypical night to day
54 mmRain, 11 days
13 h 58Daylight
182 hSunshine in the month

What to expect

  • Days average 12.1°C at the warmest and nights 6.1°C at the coolest.
  • About 54 mm of rain falls over roughly 11 days with 1 mm or more.
  • Expect about 182 hours of sunshine in the month and 13 h 58 of daylight in the middle of the month.

Planning

  • About 13 h 58 of daylight: enough for a full day out, but check sunset if you plan a viewpoint or a long walk.

What to pack

  • A warm jacket and a jumper or fleece you can take off indoors.
  • A light waterproof or a compact umbrella: about 11 days a month see 1 mm or more.
  • Comfortable walking shoes: most sights are best reached on foot.

Bank holidays in Apr

  • Fri, 14 Apr 2028: Good Friday
  • Mon, 17 Apr 2028: Easter Monday

May in Anglesey

9–15°CTypical night to day
52 mmRain, 9 days
15 h 57Daylight
233 hSunshine in the month

What to expect

  • Days average 15.0°C at the warmest and nights 8.6°C at the coolest.
  • About 52 mm of rain falls over roughly 9 days with 1 mm or more, the driest month of the year here.
  • Expect about 233 hours of sunshine in the month, the sunniest of the year and 15 h 57 of daylight in the middle of the month.

Planning

  • Long days (about 15 h 57 of daylight): there is time for an early start and a late walk.

What to pack

  • Light layers: a jumper or fleece over a T-shirt, and a light jacket for the evening.
  • A light waterproof or a compact umbrella: about 9 days a month see 1 mm or more.
  • Sunscreen, sunglasses and a hat for long days outdoors.
  • Comfortable walking shoes: most sights are best reached on foot.

Bank holidays in May

  • Mon, 3 May 2027: Early May bank holiday
  • Mon, 31 May 2027: Spring bank holiday
  • Mon, 1 May 2028: Early May bank holiday
  • Mon, 29 May 2028: Spring bank holiday

June in Anglesey

11–17°CTypical night to day
57 mmRain, 9 days
16 h 58Daylight
219 hSunshine in the month

What to expect

  • Days average 17.2°C at the warmest and nights 11.0°C at the coolest.
  • About 57 mm of rain falls over roughly 9 days with 1 mm or more.
  • Expect about 219 hours of sunshine in the month and 16 h 58 of daylight in the middle of the month.

Planning

  • Long days (about 16 h 58 of daylight): there is time for an early start and a late walk.

What to pack

  • Light layers: a jumper or fleece over a T-shirt, and a light jacket for the evening.
  • A light waterproof or a compact umbrella: about 9 days a month see 1 mm or more.
  • Sunscreen, sunglasses and a hat for long days outdoors.
  • Comfortable walking shoes: most sights are best reached on foot.

Bank holidays in Jun

No bank holidays in Wales in June for the next two years.

July in Anglesey

13–19°CTypical night to day
57 mmRain, 11 days
16 h 24Daylight
205 hSunshine in the month

What to expect

  • Days average 18.8°C at the warmest and nights 12.9°C at the coolest.
  • About 57 mm of rain falls over roughly 11 days with 1 mm or more.
  • Expect about 205 hours of sunshine in the month and 16 h 24 of daylight in the middle of the month.
  • This is the warmest month on average.

Planning

  • Long days (about 16 h 24 of daylight): there is time for an early start and a late walk.

What to pack

  • Light layers: a jumper or fleece over a T-shirt, and a light jacket for the evening.
  • A light waterproof or a compact umbrella: about 11 days a month see 1 mm or more.
  • Sunscreen, sunglasses and a hat for long days outdoors.
  • Comfortable walking shoes: most sights are best reached on foot.

Bank holidays in Jul

No bank holidays in Wales in July for the next two years.

August in Anglesey

13–19°CTypical night to day
69 mmRain, 11 days
14 h 42Daylight
188 hSunshine in the month

What to expect

  • Days average 18.8°C at the warmest and nights 13.1°C at the coolest.
  • About 69 mm of rain falls over roughly 11 days with 1 mm or more.
  • Expect about 188 hours of sunshine in the month and 14 h 42 of daylight in the middle of the month.

Planning

  • About 14 h 42 of daylight: enough for a full day out, but check sunset if you plan a viewpoint or a long walk.

What to pack

  • Light layers: a jumper or fleece over a T-shirt, and a light jacket for the evening.
  • A light waterproof or a compact umbrella: about 11 days a month see 1 mm or more.
  • Sunscreen, sunglasses and a hat for long days outdoors.
  • Comfortable walking shoes: most sights are best reached on foot.

Bank holidays in Aug

  • Mon, 30 Aug 2027: Summer bank holiday
  • Mon, 28 Aug 2028: Summer bank holiday

September in Anglesey

12–17°CTypical night to day
74 mmRain, 11 days
12 h 31Daylight
151 hSunshine in the month

What to expect

  • Days average 17.3°C at the warmest and nights 11.6°C at the coolest.
  • About 74 mm of rain falls over roughly 11 days with 1 mm or more.
  • Expect about 151 hours of sunshine in the month and 12 h 31 of daylight in the middle of the month.

Planning

  • About 12 h 31 of daylight: enough for a full day out, but check sunset if you plan a viewpoint or a long walk.

What to pack

  • Light layers: a jumper or fleece over a T-shirt, and a light jacket for the evening.
  • A light waterproof or a compact umbrella: about 11 days a month see 1 mm or more.
  • Sunscreen, sunglasses and a hat for long days outdoors.
  • Comfortable walking shoes: most sights are best reached on foot.

Bank holidays in Sep

No bank holidays in Wales in September for the next two years.

October in Anglesey

9–14°CTypical night to day
102 mmRain, 14 days
10 h 23Daylight
108 hSunshine in the month

What to expect

  • Days average 14.3°C at the warmest and nights 9.2°C at the coolest.
  • About 102 mm of rain falls over roughly 14 days with 1 mm or more.
  • Expect about 108 hours of sunshine in the month and 10 h 23 of daylight in the middle of the month.

Planning

  • About 10 h 23 of daylight: enough for a full day out, but check sunset if you plan a viewpoint or a long walk.

What to pack

  • A warm jacket and a jumper or fleece you can take off indoors.
  • A proper waterproof jacket and shoes that cope with wet pavements: this is one of the wetter months here (14 days with 1 mm or more).
  • Comfortable walking shoes: most sights are best reached on foot.

Bank holidays in Oct

No bank holidays in Wales in October for the next two years.

November in Anglesey

7–11°CTypical night to day
103 mmRain, 16 days
8 h 31Daylight
63 hSunshine in the month

What to expect

  • Days average 11.3°C at the warmest and nights 6.6°C at the coolest.
  • About 103 mm of rain falls over roughly 16 days with 1 mm or more, the wettest month of the year here.
  • Expect about 63 hours of sunshine in the month and 8 h 31 of daylight in the middle of the month.

Planning

  • Short days (about 8 h 31 of daylight): plan outdoor sights for the middle of the day and keep evenings for museums, food and shows.
  • Averaging about 63 hours of sunshine in the month, so keep an indoor back-up for each day (see our rainy-day guide).

What to pack

  • A warm jacket and a jumper or fleece you can take off indoors.
  • A proper waterproof jacket and shoes that cope with wet pavements: this is one of the wetter months here (16 days with 1 mm or more).
  • Comfortable walking shoes: most sights are best reached on foot.

Bank holidays in Nov

No bank holidays in Wales in November for the next two years.

December in Anglesey

4–9°CTypical night to day
93 mmRain, 16 days
7 h 32Daylight
48 hSunshine in the month

What to expect

  • Days average 9.1°C at the warmest and nights 4.4°C at the coolest.
  • About 93 mm of rain falls over roughly 16 days with 1 mm or more.
  • Expect about 48 hours of sunshine in the month and 7 h 32 of daylight in the middle of the month.

Planning

  • Short days (about 7 h 32 of daylight): plan outdoor sights for the middle of the day and keep evenings for museums, food and shows.
  • Averaging about 48 hours of sunshine in the month, so keep an indoor back-up for each day (see our rainy-day guide).

What to pack

  • A warm coat, hat and gloves, with thermal or wool layers underneath.
  • A proper waterproof jacket and shoes that cope with wet pavements: this is one of the wetter months here (16 days with 1 mm or more).
  • Comfortable walking shoes: most sights are best reached on foot.

Bank holidays in Dec

  • Fri, 25 Dec 2026: Christmas Day
  • Mon, 28 Dec 2026: Boxing Day
  • Mon, 27 Dec 2027: Christmas Day
  • Tue, 28 Dec 2027: Boxing Day

Holidays and busy periods

Bank holidays for Wales come from GOV.UK, listed for the next two years in each month above. Many Britons travel on bank holiday weekends, so book transport and rooms early.

School holidays are set by each local council, so we do not list dates here. Check School term and holiday dates (GOV.UK).

From our Anglesey guide

Many attractions open from Easter to October and close or shorten their hours in winter: Holyhead Maritime Museum opens Easter to the end of October, the Menai Heritage exhibition reopens in February, and Starida's Puffin Island cruises run April to October.

  • Spring (April to June): Guillemots, razorbills and puffins breed on the South Stack cliffs in spring, according to the RSPB, and the boat trips to Puffin Island start in April.
  • Summer (July to August): The busiest weeks, with the longest opening hours at Beaumaris Castle and the terns nesting at Cemlyn until August.
  • Autumn and winter (September to March): Quieter, with some museums and cafés closed; Cadw's castle and prehistoric sites, the coastal path and the RSPB reserve stay open.

We do not publish crowd or price seasonality: none of the sources used for this page states it.

How we work this out

  • Temperatures, rainfall, rain days and sunshine are the Met Office 1991-2020 monthly averages for one weather station (Valley). They describe a typical month, not a forecast. We never call a live weather service for this page.
  • Packing: warm coat below 10°C highs, warm jacket below 15°C, light layers below 20°C. A full waterproof when a month has 12 or more days with 1 mm of rain or at least 80 mm; a light waterproof from 9 days; sunscreen and a hat from May to September. Shoes with grip when typical nights are 3°C or colder.
  • Daylight is the astronomical day length, including the usual allowance for atmospheric refraction, on the 15th of the month at the latitude of Anglesey.

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