Porthmadog (Gwynedd) weather

Find a forecast

Forecast days

Sat 26 Sep

Maximum daytime temperature: 18° Celsius; Minimum nighttime temperature: 12° Celsius;

Sunrise: 07:09

Sunset: 19:05

Sunny intervals changing to partly cloudy by early evening.

M UV

L Pollution

No pollen data.

Next high tide: 09:02 for
Morfa Bychan (Craig Du) (Beach)

Sat 26 Sep

Maximum daytime temperature: 18 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius;
Sun 27 Sep

Maximum daytime temperature: 18° Celsius; Minimum nighttime temperature: 7° Celsius;

Sunrise: 07:11

Sunset: 19:03

Cloudy changing to heavy rain by late morning.

L UV

L Pollution

No pollen data.

First high tide: 09:34 for
Morfa Bychan (Craig Du) (Beach)

Sun 27 Sep

Maximum daytime temperature: 18 degrees Celsius; Minimum nighttime temperature: 7 degrees Celsius;
Mon 28 Sep

Maximum daytime temperature: 17° Celsius; Minimum nighttime temperature: 11° Celsius;

Sunrise: 07:13

Sunset: 19:01

Sunny.

M UV

L Pollution

No pollen data.

First high tide: 10:06 for
Morfa Bychan (Craig Du) (Beach)

Mon 28 Sep

Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 11 degrees Celsius;
Tue 29 Sep

Maximum daytime temperature: 22° Celsius; Minimum nighttime temperature: 16° Celsius;

Sunrise: 07:15

Sunset: 18:58

Sunny intervals changing to cloudy in the afternoon.

M UV

L Pollution

No pollen data.

First high tide: 10:38 for
Morfa Bychan (Craig Du) (Beach)

Tue 29 Sep

Maximum daytime temperature: 22 degrees Celsius; Minimum nighttime temperature: 16 degrees Celsius;
Wed 30 Sep

Maximum daytime temperature: 20° Celsius; Minimum nighttime temperature: 14° Celsius;

Sunrise: 07:16

Sunset: 18:56

Sunny intervals changing to partly cloudy by early evening.

M UV

L Pollution

No pollen data.

First high tide: 11:13 for
Morfa Bychan (Craig Du) (Beach)

Wed 30 Sep

Maximum daytime temperature: 20 degrees Celsius; Minimum nighttime temperature: 14 degrees Celsius;
Thu 1 Oct

Maximum daytime temperature: 17° Celsius; Minimum nighttime temperature: 12° Celsius;

Sunrise: 07:18

Sunset: 18:53

Sunny.

M UV

No pollution data.

No pollen data.

First high tide: 11:55 for
Morfa Bychan (Craig Du) (Beach)

Thu 1 Oct

Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius;
Fri 2 Oct

Maximum daytime temperature: 17° Celsius; Minimum nighttime temperature: 13° Celsius;

Sunrise: 07:20

Sunset: 18:51

Sunny intervals changing to partly cloudy by early evening.

M UV

No pollution data.

No pollen data.

First high tide: 00:22 for
Morfa Bychan (Craig Du) (Beach)

Fri 2 Oct

Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 13 degrees Celsius;

Sunny intervals changing to partly cloudy by early evening.

Sunrise: 07:09

Sunset: 19:05

M UV

L Pollution

No pollen data.

Next high tide: 09:02 for

Morfa Bychan (Craig Du) (Beach)

7 day forecast for Porthmadog

Today (26 September 2026)

Time	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Weather symbols
Chance of precipitation	10%	10%	20%	30%	40%	40%	30%	<5%	10%	<5%	<5%	<5%	20%	30%	40%	20%	10%
Temperature (°C)	14°	14°	16°	16°	17°	17°	17°	18°	18°	18°	17°	17°	16°	16°	15°	15°	15°
Feels like temperature (°C)	13°	14°	14°	15°	14°	15°	15°	15°	15°	15°	16°	15°	14°	14°	14°	14°	14°
Wind direction and speed (mph)	W 6	W 6	WSW 8	SW 9	SW 13	SW 13	SW 13	SW 13	SW 13	SW 13	SW 11	SW 11	SW 9	SSW 9	SSW 8	S 8	S 7
Wind gust (mph)	21	21	22	24	25	26	26	26	25	24	23	22	21	20	20	20	20
Visibility (description)	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	G	G
Humidity	86%	86%	83%	75%	75%	76%	75%	75%	74%	74%	74%	76%	80%	80%	82%	84%	85%
UV	1	1	1	2	3	3	3	3	2	1	1	1	1	-	-	-	-

Sunday (27 September 2026)

Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Weather symbols
Chance of precipitation	10%	10%	<5%	<5%	<5%	10%	20%	40%	70%	80%	90%	90%	80%	70%	60%	40%	30%	30%	10%	<5%	<5%	<5%	<5%	<5%
Temperature (°C)	14°	14°	14°	14°	13°	13°	13°	13°	14°	14°	15°	16°	16°	17°	17°	17°	17°	16°	15°	13°	12°	11°	10°	10°
Feels like temperature (°C)	14°	13°	13°	13°	13°	12°	12°	12°	13°	13°	14°	14°	14°	14°	15°	15°	15°	15°	15°	12°	11°	10°	10°	9°
Wind direction and speed (mph)	S 6	SSE 6	SSE 6	SSE 6	SE 6	E 6	ENE 6	ENE 6	ENE 6	E 7	SE 9	SSE 13	S 14	S 16	SSW 16	WSW 14	W 11	WNW 9	WNW 6	WNW 4	NW 4	NNW 3	NNW 3	NNW 4
Wind gust (mph)	20	21	21	21	21	23	23	23	23	28	34	39	37	37	34	31	28	25	21	17	16	13	13	15
Visibility (description)	G	G	G	VG	G	VG	VG	G	G	M	M	M	M	M	M	M	G	G	M	G	VG	G	VG	VG
Humidity	86%	86%	85%	85%	86%	85%	84%	82%	77%	77%	81%	84%	85%	86%	88%	85%	79%	75%	77%	84%	85%	85%	84%	84%
UV	-	-	-	-	-	-	-	1	1	1	1	1	1	1	2	1	1	1	1	1	-	-	-	-

Monday (28 September 2026)

Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Weather symbols
Chance of precipitation	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	10%	10%	10%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%
Temperature (°C)	10°	10°	9°	8°	8°	8°	8°	8°	9°	12°	14°	15°	16°	17°	17°	17°	17°	17°	15°	13°	12°	12°	11°	11°
Feels like temperature (°C)	9°	9°	8°	7°	7°	7°	7°	6°	8°	11°	14°	15°	16°	16°	16°	16°	17°	17°	15°	12°	11°	10°	10°	9°
Wind direction and speed (mph)	N 4	N 4	N 4	N 4	N 4	N 4	NNE 4	NNE 4	NNE 4	NE 3	ENE 2	S 3	SSW 4	SSW 6	SSW 6	SSW 5	SSW 3	SSW 2	NNE 3	NE 5	NE 7	NE 7	NE 8	NE 9
Wind gust (mph)	14	13	12	12	10	10	10	10	11	11	9	11	13	13	12	12	12	9	11	13	15	17	19	21
Visibility (description)	VG	VG	VG	G	VG	G	G	G	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG
Humidity	85%	85%	85%	86%	85%	85%	85%	84%	83%	76%	71%	65%	59%	58%	56%	55%	55%	57%	76%	75%	72%	68%	67%	66%
UV	-	-	-	-	-	-	-	1	1	1	2	3	3	3	3	2	1	1	1	1	-	-	-	-

Tuesday (29 September 2026)

Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Weather symbols
Chance of precipitation	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	10%	10%	10%	10%	10%	20%	30%	30%	30%	40%	40%	60%	70%	70%	70%	80%
Temperature (°C)	12°	12°	12°	13°	13°	14°	14°	14°	15°	16°	17°	18°	20°	20°	21°	21°	22°	22°	21°	21°	20°	19°	19°	19°
Feels like temperature (°C)	10°	10°	10°	11°	11°	12°	12°	12°	13°	14°	15°	16°	17°	17°	18°	19°	19°	19°	19°	18°	17°	17°	17°	17°
Wind direction and speed (mph)	NE 9	NE 9	NE 8	ENE 9	ENE 10	ENE 10	ENE 11	E 13	E 13	ESE 13	ESE 15	ESE 15	SE 15	SE 15	SE 15	SE 15	SE 15	SE 15	SSE 15	SSE 15	SSE 16	SSE 16	SSE 16	SSE 16
Wind gust (mph)	21	23	25	27	28	30	34	35	35	37	38	37	36	35	34	34	33	34	35	35	36	36	35	36
Visibility (description)	VG	VG	VG	VG	VG	VG	G	G	G	G	G	G	G	G	G	G	G	G	G	G	G	G	M	M
Humidity	65%	65%	66%	71%	74%	77%	80%	82%	83%	83%	78%	77%	76%	75%	75%	74%	75%	75%	75%	75%	78%	82%	83%	85%
UV	-	-	-	-	-	-	-	1	1	1	2	2	3	3	2	2	1	1	1	-	-	-	-	-

Wednesday (30 September 2026)

Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Weather symbols
Chance of precipitation	70%	70%	60%	50%	40%	40%	40%	30%	30%	30%	30%	20%	20%	10%	20%	20%	30%	30%	20%	20%	20%	20%	30%	30%
Temperature (°C)	19°	19°	18°	18°	18°	18°	17°	17°	17°	17°	18°	19°	19°	19°	19°	19°	19°	19°	18°	17°	16°	16°	16°	16°
Feels like temperature (°C)	17°	17°	17°	16°	16°	16°	16°	15°	15°	16°	16°	16°	16°	16°	16°	16°	16°	16°	16°	15°	14°	14°	14°	14°
Wind direction and speed (mph)	S 15	SSE 15	S 13	S 13	S 11	S 11	S 11	S 11	S 10	S 11	S 14	S 15	S 15	SSW 16	SSW 16	SSW 16	SSW 15	SSW 15	SSW 14	SSW 13	S 13	S 13	S 13	S 13
Wind gust (mph)	34	31	29	28	28	28	28	27	28	30	31	31	34	34	34	34	32	30	30	28	27	26	25	25
Visibility (description)	M	M	M	M	M	M	M	M	M	G	M	M	M	G	G	G	G	G	M	M	G	G	M	M
Humidity	87%	89%	90%	89%	88%	89%	89%	90%	90%	88%	86%	83%	78%	75%	72%	71%	74%	76%	78%	83%	85%	87%	89%	90%
UV	-	-	-	-	-	-	-	1	1	1	2	3	3	3	3	2	1	1	1	-	-	-	-	-

Thursday (1 October 2026)

Time	00:00	01:00	04:00	07:00	10:00	13:00	16:00	19:00	22:00
Weather symbols
Chance of precipitation	30%	40%	50%	50%	40%	30%	10%	10%	20%
Temperature (°C)	16°	16°	16°	15°	16°	17°	17°	15°	14°
Feels like temperature (°C)	14°	14°	14°	13°	14°	15°	14°	13°	13°
Wind direction and speed (mph)	S 13	S 13	SSW 11	SSW 11	SSW 13	SW 14	SW 14	SW 9	SSW 7
Wind gust (mph)	25	24	22	23	26	28	26	18	15
Visibility (description)	M	M	M	M	G	G	G	G	M
Humidity	91%	91%	92%	93%	88%	76%	75%	86%	92%
UV	-	-	-	1	2	3	1	-	-

Friday (2 October 2026)

Time	01:00	04:00	07:00	10:00	13:00	16:00	19:00	22:00
Weather symbols
Chance of precipitation	20%	20%	20%	20%	10%	10%	10%	10%
Temperature (°C)	13°	13°	12°	15°	17°	17°	13°	13°
Feels like temperature (°C)	12°	12°	11°	14°	15°	16°	13°	12°
Wind direction and speed (mph)	SW 6	SW 6	SSW 6	SW 7	WSW 9	WSW 9	SSW 5	SSE 5
Wind gust (mph)	13	12	16	19	20	17	10	9
Visibility (description)	M	M	P	G	G	G	G	M
Humidity	94%	94%	95%	86%	75%	75%	91%	94%
UV	-	-	1	2	3	1	-	-

UK video forecast

Porthmadog weather map

View the weather with our interactive map

Loading map...

Wales weather forecast

Headline:

A fine start to the weekend.

Today:

Staying largely dry across Wales today with fine spells of sunshine. There is a small chance of the odd shower in the afternoon, but staying dry and pleasantly warm for many. Maximum temperature 19 °C.

Tonight:

Skies remaining clear at first tonight, and turning chilly. A few mist and fog patches possible. Cloud increasing a little towards the end of the night. Minimum temperature 4 °C.

Sunday:

A dry but largely cloudy start on Sunday. Heavy and persistent rain will arrive later, with strengthening winds. Mild but feeling cooler in the rain. Maximum temperature 21 °C.

Outlook for Monday to Wednesday:

Some pleasant spells of warm sunshine on Monday with light winds. Strengthening winds on Tuesday and unseasonably warm, some rain later. Fresher and breezy on Wednesday with sunshine and showers.

Updated: 04:00 (UTC+1) on Sat 26 Sep 2026

UK long range weather forecast

Remaining changeable as Atlantic frontal systems bring spells of rain, showers and occasional strong winds. The wettest and windiest conditions will tend to be most frequent across western areas, with longer drier interludes most favoured in the far east and southeast, where it may be very warm at times. Into October, high pressure to the northeast of the UK may become more influential on the weather, with some longer drier interludes focussed more across the north and northeast of the UK, whilst occasional rain may tend to be more prevalent towards the south and west. Temperatures are expected to be above average for the period as a whole.

Updated: 13:00 (UTC+1) on Fri 25 Sep 2026

Initially, high pressure may be centred to the north or northeast, with longer drier periods more likely across northern UK, whilst low pressure to the southwest brings occasional rain or showers into more southern and western parts. Towards and beyond mid-October, it may turn more widely unsettled with a greater chance of wet and windy conditions at times. Temperatures will likely be above average for the period as a whole.

Updated: 14:00 (UTC+1) on Fri 25 Sep 2026

Porthmadog (Gwynedd) weather

Find a forecast

Forecast days

Sat 26 Sep

Sat 26 Sep

Sun 27 Sep

Sun 27 Sep

Mon 28 Sep

Mon 28 Sep

Tue 29 Sep

Tue 29 Sep

Wed 30 Sep

Wed 30 Sep

Thu 1 Oct

Thu 1 Oct

Fri 2 Oct

Fri 2 Oct

7 day forecast for Porthmadog

Tooltip header

UK video forecast

Wales weather forecast

Headline:

Today:

Tonight:

Sunday:

Outlook for Monday to Wednesday:

UK long range weather forecast

Nearest forecasts

Porthmadog (Gwynedd) weather

Find a forecast

Forecast days

Sat 26 Sep

Sat 26 Sep

Sun 27 Sep

Sun 27 Sep

Mon 28 Sep

Mon 28 Sep

Tue 29 Sep

Tue 29 Sep

Wed 30 Sep

Wed 30 Sep

Thu 1 Oct

Thu 1 Oct

Fri 2 Oct

Fri 2 Oct

7 day forecast for Porthmadog

UK video forecast

Wales weather forecast

Saturday 26 Sep - Wednesday 30 Sep

Headline:

Today:

Tonight:

Sunday:

Outlook for Monday to Wednesday:

UK long range weather forecast

Wednesday 30 Sep - Friday 9 Oct

Saturday 10 Oct - Saturday 24 Oct

Nearest forecasts