Weather in Gwynedd

Calculated from weather data of Caernarfon Airport (EGCK) between 2020 and 2024.

Maximum temperatures (°C)

Month	Average	2024	2023	2022	2021	2020
January	8.4	8.5	8.9	8.9	7.0	9.4
February	9.3	10.4	9.5	9.9	8.4	9.4
March	10.3	10.5	9.6	12.4	10.0	10.5
April	13.1		12.6	13.0	11.6	14.9
May	15.5		16.8	15.8	13.5	16.5
June	18.5		20.8	17.3	18.1	17.3
July	19.6		18.6	20.3	21.0	17.1
August	19.2		18.8	20.8	18.6	19.1
September	17.9		19.8	18.1	18.3	17.1
October	14.5		15.5	15.9	14.8	13.3
November	11.3		11.1	12.6	11.4	12.4
December	9.2		10.1	6.7	9.6	8.5
Average	13.1	9.7	14.4	14.5	13.5	13.8

55th highest temperature of United Kingdom

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°C)

Month	Average	2024	2023	2022	2021	2020
January	4.1	4	5	4	3	5
February	4.7	6	5	6	4	5
March	4.4	5	5	4	5	4
April	5.5		6	6	2	7
May	8.0		9	10	7	8
June	10.9		13	11	11	11
July	12.9		14	13	13	13
August	13.4		14	14	13	14
September	11.4		14	11	12	11
October	9.6		10	11	11	9
November	6.6		6	8	7	7
December	5.1		7	0	5	5
Average	7.5	4.8	8.8	8.3	7.7	8.1

66th lowest temperature of United Kingdom

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Cold and hot days

Number of days	2024	2023	2022	2021	2020
30 °C or warmer	0	0	2	0	0
25 °C or warmer	0	6	6	6	5
20 °C or warmer	0	35	32	26	27
0 °C or colder	6	15	14	23	6

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	14.3	18	12	5	20	20
February	15.2	20	4	18	20	20
March	11.6	10	20	8	7	5
April	7.9		9	4	3	5
May	7.1		4	5	18	1
June	7.6		5	6	8	12
July	8.9		15	6	4	17
August	8.9		8	5	8	14
September	9.7		12	9	8	8
October	14.5		10	10	20	20
November	15.5		13	15	14	16
December	18.0		21	5	15	21
Average	11.9	16.0	10.5	7.5	11.0	12.0

Precipitation during daylight period

Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.

Wind speed (km/h)

Month	Average	2024	2023	2022	2021	2020
January	23.1	24	25	21	21	26
February	26.3	23	20	33	25	36
March	22.5	20	24	19	22	25
April	17.9		19	20	16	17
May	18.7		17	21	20	20
June	18.6		17	20	18	21
July	18.3		24	17	15	21
August	19.9		20	17	20	21
September	19.6		19	19	16	20
October	23.6		20	26	25	26
November	23.3		25	26	22	25
December	23.4		28	14	23	23
Average	21.4	22.2	20.9	20.6	19.7	22.6

17th highest wind speed of United Kingdom

Average wind speed

Excluding wind gusts. Only observations between sunrise and sunset are taken into account.

Prevailing wind direction

Month	2024	2023	2022	2021	2020
January	SW	SW	SW	W	SW
February	SW	SW	SW	S	SW
March	S	SW	SE	SW	SW
April		SW	W	N	NW
May		N	SW	SW	W
June		W	SW	W	W
July		SW	W	W	SW
August		SW	W	SW	SW
September		SW	NW	SW	SW
October		S	SW	SW	W
November		W	S	W	SW
December		SW	SE	SW	SW

Prevailing wind direction

Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.

Gwynedd weather Q&A

What is the warmest month in Gwynedd?

The warmest month is July with an average temperature of 20 °C over the past years.

What is the coldest month in Gwynedd?

The coldest month is January with an average daytime temperature of 8 °C in the past few years.

Which month is the wettest in Gwynedd?

Chance of precipitation is the highest in December with a probability of around 18.0 %.

Which month is the driest in Gwynedd?

The least rainfall and snow can be expected in May. The probability is about 7.2 %.