Harlech weather
The Harlech weather guide shows monthly weather averages (including daytime and night-time temperatures, rainfall and hours of sunshine) for holidays in Harlech, Gwynedd, Wales in 2026/2027.
Harlech weather averages
Check the Harlech weather averages for each month of the year including maximum daytime and minimum night-time temperatures, monthly rainfall, number of days with rain and average daily hours of sunshine for Harlech, Gwynedd, Wales.
Harlech weather by month
Check the weather for Harlech, Gwynedd, Wales for a particular month by selecting from the list below. This gives the best indication of what to expect from the weather months in advance.
Harlech weather in January
The average maximum daytime temperature in Harlech in January is a cold 7°C (45°F), while the average minimum night-time temperature is a cold 2°C (36°F). You can expect on average 1 hours of sunshine a day in Harlech during January.
- 7°C max day temperature
7 - 1 hour of sunshine per day
1 - 21 days with some rainfall
21 - 2°C min night temperature
2 - 210 mm of monthly rainfall
210
On average 210 mm (8.3 inches) of rain normally falls in Harlech during January with rain falling on 21 days of the month.
Harlech weather in February
The average maximum daytime temperature in Harlech in February is a cold 7°C (45°F), while the average minimum night-time temperature is a cold 2°C (36°F). You can expect on average 2 hours of sunshine a day in Harlech during February.
- 7°C max day temperature7
- 2 hours of sunshine per day
2 - 17 days with some rainfall
17 - 2°C min night temperature2
- 153 mm of monthly rainfall
153
On average 153 mm (6 inches) of rain normally falls in Harlech during February with rain falling on 17 days of the month.
Harlech weather in March
The average maximum daytime temperature in Harlech in March is a cool 9°C (48°F), while the average minimum night-time temperature is a cold 3°C (37°F). You can expect on average 3 hours of sunshine a day in Harlech during March.
- 9°C max day temperature
9 - 3 hours of sunshine per day
3 - 18 days with some rainfall18
- 3°C min night temperature3
- 160 mm of monthly rainfall160
On average 160 mm (6.3 inches) of rain normally falls in Harlech during March with rain falling on 18 days of the month.
Harlech weather in April
The average maximum daytime temperature in Harlech in April is a cool 11°C (52°F), while the average minimum night-time temperature is a cold 4°C (39°F). You can expect on average 5 hours of sunshine a day in Harlech during April.
- 11°C max day temperature11
- 5 hours of sunshine per day
5 - 16 days with some rainfall16
- 4°C min night temperature4
- 105 mm of monthly rainfall
105
On average 105 mm (4.1 inches) of rain normally falls in Harlech during April with rain falling on 16 days of the month.
Harlech weather in May
The average maximum daytime temperature in Harlech in May is a comfortable 15°C (59°F), while the average minimum night-time temperature is a cold 7°C (45°F). You can expect on average 6 hours of sunshine a day in Harlech during May.
- 15°C max day temperature
15 - 6 hours of sunshine per day
6 - 15 days with some rainfall
15 - 7°C min night temperature7
- 98 mm of monthly rainfall
98
On average 98 mm (3.9 inches) of rain normally falls in Harlech during May with rain falling on 15 days of the month.
Harlech weather in June
The average maximum daytime temperature in Harlech in June is a comfortable 17°C (63°F), while the average minimum night-time temperature is a cool 9°C (48°F). You can expect on average 6 hours of sunshine a day in Harlech during June.
- 17°C max day temperature17
- 6 hours of sunshine per day6
- 14 days with some rainfall14
- 9°C min night temperature9
- 107 mm of monthly rainfall107
On average 107 mm (4.2 inches) of rain normally falls in Harlech during June with rain falling on 14 days of the month.
Harlech weather in July
The average maximum daytime temperature in Harlech in July is a comfortable 19°C (66°F), while the average minimum night-time temperature is a cool 11°C (52°F). You can expect on average 5 hours of sunshine a day in Harlech during July.
- 19°C max day temperature
19 - 5 hours of sunshine per day5
- 13 days with some rainfall13
- 11°C min night temperature11
- 98 mm of monthly rainfall98
On average 98 mm (3.9 inches) of rain normally falls in Harlech during July with rain falling on 13 days of the month.
Harlech weather in August
The average maximum daytime temperature in Harlech in August is a comfortable 19°C (66°F), while the average minimum night-time temperature is a cool 11°C (52°F). You can expect on average 5 hours of sunshine a day in Harlech during August.
- 19°C max day temperature19
- 5 hours of sunshine per day5
- 16 days with some rainfall16
- 11°C min night temperature11
- 129 mm of monthly rainfall
129
On average 129 mm (5.1 inches) of rain normally falls in Harlech during August with rain falling on 16 days of the month.
Harlech weather in September
The average maximum daytime temperature in Harlech in September is a comfortable 17°C (63°F), while the average minimum night-time temperature is a cool 9°C (48°F). You can expect on average 4 hours of sunshine a day in Harlech during September.
- 17°C max day temperature17
- 4 hours of sunshine per day
4 - 16 days with some rainfall16
- 9°C min night temperature9
- 164 mm of monthly rainfall
164
On average 164 mm (6.5 inches) of rain normally falls in Harlech during September with rain falling on 16 days of the month.
Harlech weather in October
The average maximum daytime temperature in Harlech in October is a cool 13°C (55°F), while the average minimum night-time temperature is a cold 7°C (45°F). You can expect on average 3 hours of sunshine a day in Harlech during October.
- 13°C max day temperature
13 - 3 hours of sunshine per day3
- 18 days with some rainfall18
- 7°C min night temperature7
- 196 mm of monthly rainfall
196
On average 196 mm (7.7 inches) of rain normally falls in Harlech during October with rain falling on 18 days of the month.
Harlech weather in November
The average maximum daytime temperature in Harlech in November is a cool 10°C (50°F), while the average minimum night-time temperature is a cold 4°C (39°F). You can expect on average 2 hours of sunshine a day in Harlech during November.
- 10°C max day temperature10
- 2 hours of sunshine per day2
- 20 days with some rainfall20
- 4°C min night temperature4
- 206 mm of monthly rainfall206
On average 206 mm (8.1 inches) of rain normally falls in Harlech during November with rain falling on 20 days of the month.
Harlech weather in December
The average maximum daytime temperature in Harlech in December is a cool 8°C (46°F), while the average minimum night-time temperature is a cold 3°C (37°F). You can expect on average 1 hours of sunshine a day in Harlech during December.
- 8°C max day temperature8
- 1 hour of sunshine per day1
- 21 days with some rainfall21
- 3°C min night temperature3
- 225 mm of monthly rainfall
225
On average 225 mm (8.9 inches) of rain normally falls in Harlech during December with rain falling on 21 days of the month.