Grandes Rocques (Beach) (Guernsey) weather

Find a forecast

Here are our top tips to keep you, your friends and family safe at the beach with links to Royal National Lifeboat Institution (RNLI) and Met Office advice.

Head to a lifeguarded beach; check the RNLI lifeguarded beach tool
Follow RNLI Float to Live advice if you find yourself struggling in the water
Know what to do if you get caught in a rip current (RNLI)
Check the tide times to avoid getting cut off by the tide coming in
Call 999 and ask for the coastguard in an emergency
Learn more about staying safe at the beach

Weather forecast Beach forecast

Forecast days

Mon 28 Sep

Maximum daytime temperature: 19° Celsius; Minimum nighttime temperature: 17° Celsius;

Sunrise: 07:06

Sunset: 18:55
Cloudy changing to sunny intervals by lunchtime.
Beach safety today
Large, powerful waves

• only experts should take part in water activities
Tide: Next high tide (9.4m) at 08:20
M UV

L Pollution

No pollen data.
Mon 28 Sep

Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 17 degrees Celsius;
Tue 29 Sep

Maximum daytime temperature: 22° Celsius; Minimum nighttime temperature: 18° Celsius;

Sunrise: 07:07

Sunset: 18:53

Sunny intervals changing to cloudy by early evening.

M UV

L Pollution

No pollen data.

Tue 29 Sep

Maximum daytime temperature: 22 degrees Celsius; Minimum nighttime temperature: 18 degrees Celsius;
Wed 30 Sep

Maximum daytime temperature: 21° Celsius; Minimum nighttime temperature: 16° Celsius;

Sunrise: 07:09

Sunset: 18:51

Cloudy changing to sunny by late morning.

M UV

L Pollution

No pollen data.

Wed 30 Sep

Maximum daytime temperature: 21 degrees Celsius; Minimum nighttime temperature: 16 degrees Celsius;
Thu 1 Oct

Maximum daytime temperature: 19° Celsius; Minimum nighttime temperature: 16° Celsius;

Sunrise: 07:10

Sunset: 18:49

Sunny.

M UV

L Pollution

No pollen data.

Thu 1 Oct

Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 16 degrees Celsius;
Fri 2 Oct

Maximum daytime temperature: 19° Celsius; Minimum nighttime temperature: 17° Celsius;

Sunrise: 07:12

Sunset: 18:47

Sunny.

M UV

No pollution data.

No pollen data.

Fri 2 Oct

Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 17 degrees Celsius;
Sat 3 Oct

Maximum daytime temperature: 19° Celsius; Minimum nighttime temperature: 17° Celsius;

Sunrise: 07:13

Sunset: 18:45

Sunny.

M UV

No pollution data.

No pollen data.

Sat 3 Oct

Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 17 degrees Celsius;
Sun 4 Oct

Maximum daytime temperature: 19° Celsius; Minimum nighttime temperature: 17° Celsius;

Sunrise: 07:15

Sunset: 18:42

Sunny changing to partly cloudy by nighttime.

M UV

No pollution data.

No pollen data.

Sun 4 Oct

Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 17 degrees Celsius;

Cloudy changing to sunny intervals by lunchtime.

Sunrise: 07:06

Sunset: 18:55

M UV

L Pollution

No pollen data.

7 day forecast for Grandes Rocques (Beach)

Today (28 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	<5%	<5%	<5%	<5%	<5%	<5%	<5%	10%	<5%	<5%	<5%	<5%	<5%	10%	10%	10%	10%
Temperature (°C)	15°	15°	16°	17°	18°	18°	18°	18°	18°	18°	18°	18°	17°	17°	17°	17°	17°
Feels like temperature (°C)	14°	14°	15°	16°	16°	16°	17°	16°	16°	16°	16°	16°	15°	15°	15°	15°	15°
Wind direction and speed (mph)	NNE 9	NNE 8	NE 9	NE 9	NE 9	ENE 9	NE 9	ENE 11	NE 11	NE 11	NE 11	ENE 13	ENE 13	ENE 13	ENE 11	E 11	E 13
Wind gust (mph)	13	13	13	14	14	15	16	17	17	17	19	20	20	21	21	22	23
Visibility (description)	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	G	G	G	G	G	M
Humidity	67%	66%	65%	65%	65%	66%	67%	70%	71%	72%	73%	74%	75%	78%	81%	83%	86%
UV	1	1	1	2	2	3	3	2	2	1	1	1	-	-	-	-	-
Wind direction and speed (mph)	9	8	9	9	9	9	9	11	11	11	11	13	13	13	11	11	13
Height of waves offshore (m)	1.3	1.3	1.3	1.2	1.1	1.1	1.0	0.9	0.9	0.9	1.0	1.1	1.1	1.2	1.1	1.1	1.0
Period of waves offshore (s)	10	10	10	10	11	11	11	11	11	11	11	11	11	11	11	11	11
Direction of waves offshore

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	10%	20%	20%	10%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	10%	10%	30%	40%	50%	70%
Temperature (°C)	17°	18°	18°	18°	18°	18°	18°	18°	18°	19°	19°	20°	20°	21°	21°	22°	22°	22°	22°	21°	21°	20°	20°	20°
Feels like temperature (°C)	16°	16°	16°	16°	16°	16°	17°	16°	17°	17°	17°	18°	18°	19°	19°	20°	20°	20°	19°	19°	18°	17°	16°	16°
Wind direction and speed (mph)	E 13	E 13	E 13	E 11	ESE 11	ESE 11	ESE 11	SE 11	SE 11	SE 13	SSE 13	SSE 15	SSE 16	SSE 16	SSE 16	SSE 16	SSE 16	SSE 16	SSE 16	SSE 16	SSE 16	SSE 18	SSE 18	S 18
Wind gust (mph)	24	23	23	22	21	20	20	21	22	23	24	25	24	24	24	25	26	26	26	27	28	28	28	29
Visibility (description)	G	G	M	G	G	G	G	G	G	M	M	M	M	G	G	G	G	G	G	G	G	G	G	M
Humidity	87%	90%	91%	92%	92%	92%	91%	91%	92%	91%	90%	89%	88%	86%	83%	80%	76%	75%	75%	75%	76%	77%	80%	83%
UV	-	-	-	-	-	-	-	1	1	1	2	3	4	4	3	2	1	1	1	-	-	-	-	-
Wind direction and speed (mph)	13	13	13	11	11	11	11	11	11	13	13	15	16	16	16	16	16	16	16	16	16	18	18	18
Height of waves offshore (m)	0.9	0.9	0.9	0.8	0.8	0.9	0.9	0.9	0.9	0.9	0.8	0.8	0.7	0.7	0.7	0.6	0.6	0.6	0.6	0.7	0.7	0.6	0.6	0.6
Period of waves offshore (s)	11	11	11	11	11	11	11	11	11	11	11	11	10	10	10	10	10	10	10	10	10	10	10	10
Direction of waves offshore

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	80%	90%	90%	70%	60%	50%	50%	30%	10%	<5%	<5%	10%	10%	10%	10%	10%	20%	10%	10%	20%	10%	10%	10%	10%
Temperature (°C)	19°	19°	19°	19°	19°	19°	19°	18°	18°	19°	19°	20°	20°	20°	21°	21°	20°	20°	19°	19°	18°	18°	18°	17°
Feels like temperature (°C)	16°	16°	16°	16°	16°	16°	17°	17°	16°	17°	17°	17°	17°	18°	19°	19°	18°	17°	17°	17°	16°	16°	16°	15°
Wind direction and speed (mph)	S 18	S 18	S 18	S 19	S 18	S 17	SSW 14	SSW 13	SSW 13	SSW 13	SSW 15	SSW 16	SSW 16	SSW 16	SSW 13	SW 13	SW 13	SW 13	SW 13	SW 12	SW 11	SW 13	SW 11	SW 12
Wind gust (mph)	30	31	34	34	31	30	28	24	24	24	25	25	25	23	22	25	25	24	22	21	22	24	24	24
Visibility (description)	M	M	M	M	M	M	M	M	M	G	G	G	G	G	G	G	G	G	G	G	G	G	G	G
Humidity	84%	85%	86%	87%	86%	87%	88%	87%	86%	85%	83%	80%	77%	77%	75%	74%	75%	75%	74%	74%	74%	73%	74%	77%
UV	-	-	-	-	-	-	-	1	1	1	2	3	4	4	3	2	1	1	1	-	-	-	-	-
Wind direction and speed (mph)	18	18	18	19	18	17	14	13	13	13	15	16	16	16	13	13	13	13	13	12	11	13	11	12
Height of waves offshore (m)	0.6	0.6	0.5	0.6	0.6	0.7	1.0	1.3	1.4	1.3	1.2	1.1	1.1	1.0	1.1	1.1	1.2	1.3	1.3	1.3	1.4	1.4	1.4	1.4
Period of waves offshore (s)	10	10	10	10	10	11	12	11	11	11	11	11	11	11	11	11	10	10	10	10	10	10	10	10
Direction of waves offshore

Thursday (1 October 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%	<5%	10%	10%	20%	20%	10%	10%	10%	10%	10%	10%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%
Temperature (°C)	17°	17°	17°	17°	17°	16°	16°	16°	16°	17°	18°	18°	19°	19°	19°	19°	19°	18°	18°	17°	17°	17°	16°	16°
Feels like temperature (°C)	15°	15°	15°	15°	15°	15°	14°	14°	14°	15°	16°	16°	17°	16°	17°	17°	17°	16°	16°	15°	15°	15°	15°	15°
Wind direction and speed (mph)	SW 11	SW 13	SW 13	SW 13	WSW 12	WSW 11	WSW 11	WSW 11	WSW 11	W 11	W 11	W 11	W 11	W 13	W 11	W 11	W 11	W 11	W 11	W 10	W 9	WSW 9	WSW 9	WSW 9
Wind gust (mph)	23	22	22	22	22	22	22	22	22	21	20	21	20	20	20	20	20	18	18	17	18	18	17	17
Visibility (description)	G	G	G	G	G	G	G	G	G	G	G	G	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG
Humidity	76%	76%	76%	76%	76%	75%	74%	74%	73%	71%	71%	71%	68%	67%	66%	65%	65%	65%	65%	65%	65%	65%	66%	65%
UV	-	-	-	-	-	-	-	1	1	1	2	3	4	4	3	2	1	1	1	-	-	-	-	-
Wind direction and speed (mph)	11	13	13	13	12	11	11	11	11	11	11	11	11	13	11	11	11	11	11	10	9	9	9	9
Height of waves offshore (m)	1.5	1.5	1.5	1.5	1.6	1.6	1.6	1.7	1.7	1.7	1.7	1.8	1.8	1.9	1.9	1.9	1.8	1.8	1.7	1.7	1.6	1.6	1.5	1.5
Period of waves offshore (s)	10	10	10	10	10	10	10	10	10	12	13	13	13	13	13	13	13	13	13	13	13	12	12	12
Direction of waves offshore

Friday (2 October 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%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%
Temperature (°C)	16°	16°	16°	16°	16°	16°	16°	16°	16°	17°	18°	18°	19°	19°	19°	19°	19°	19°	18°	17°	17°	17°	17°	17°
Feels like temperature (°C)	15°	15°	14°	15°	15°	15°	15°	14°	15°	16°	16°	17°	17°	18°	18°	18°	18°	19°	18°	17°	16°	16°	16°	16°
Wind direction and speed (mph)	SW 9	SW 9	SW 9	SSW 9	SSW 9	SSW 9	SSW 8	SSW 8	SSW 8	SSW 8	SSW 9	SSW 9	SSW 9	SW 9	SW 9	SW 7	SW 7	SW 5	SW 5	SE 6	E 7	E 7	E 7	ESE 7
Wind gust (mph)	17	17	17	16	17	16	15	15	15	16	16	15	14	14	13	11	10	9	9	10	11	12	12	12
Visibility (description)	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	VG	G	G	G
Humidity	66%	66%	68%	69%	70%	70%	71%	71%	71%	71%	69%	69%	69%	69%	69%	69%	69%	68%	69%	70%	72%	73%	73%	74%
UV	-	-	-	-	-	-	-	1	1	1	2	3	4	4	3	2	1	1	1	-	-	-	-	-
Wind direction and speed (mph)	9	9	9	9	9	9	8	8	8	8	9	9	9	9	9	7	7	5	5	6	7	7	7	7
Height of waves offshore (m)	1.4	1.4	1.3	1.3	1.2	1.2	1.2	1.1	1.1	1.1	1.1	1.1	1.1	1.1	1.1	1.1	1.1	1.1	1.1	1.1	1.1	1.0	1.0	1.0
Period of waves offshore (s)	12	12	12	12	12	12	12	11	11	11	11	11	10	10	10	10	10	10	10	10	10	10	10	10
Direction of waves offshore

Saturday (3 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	<5%	<5%	<5%	<5%	<5%	<5%	<5%	<5%	10%
Temperature (°C)	17°	17°	18°	18°	18°	18°	19°	19°	18°
Feels like temperature (°C)	16°	16°	17°	16°	17°	17°	17°	17°	17°
Wind direction and speed (mph)	ESE 7	ESE 7	E 7	ENE 9	ENE 9	NE 7	NE 9	NNE 9	NE 9
Wind gust (mph)	12	11	12	13	13	14	15	17	16
Visibility (description)	G	G	G	G	G	G	G	G	G
Humidity	74%	74%	75%	75%	76%	76%	76%	76%	79%
UV	-	-	-	1	2	4	1	-	-
Wind direction and speed (mph)	7	7	7	9	9	7	9	9	9
Height of waves offshore (m)	1.0	1.0	1.0	0.9	0.9	0.9	0.8	0.8	0.8
Period of waves offshore (s)	10	10	10	10	10	10	10	10	10
Direction of waves offshore

Sunday (4 October 2026)

Time	01:00	04:00	07:00	10:00	13:00	16:00	19:00	22:00
Weather symbols
Chance of precipitation	10%	10%	10%	10%	10%	10%	10%	10%
Temperature (°C)	18°	18°	18°	18°	18°	18°	18°	18°
Feels like temperature (°C)	17°	16°	16°	16°	17°	16°	16°	15°
Wind direction and speed (mph)	NNE 10	NNE 10	NNE 11	NNE 11	NNE 11	N 11	N 13	N 14
Wind gust (mph)	16	17	18	19	20	21	22	21
Visibility (description)	G	G	G	G	G	M	G	G
Humidity	80%	81%	81%	80%	80%	79%	78%	78%
UV	-	-	1	2	3	1	-	-
Wind direction and speed (mph)	10	–	–	–	–	–	–	–
Height of waves offshore (m)	0.7	–	–	–	–	–	–	–
Period of waves offshore (s)	10	–	–	–	–	–	–	–
Direction of waves offshore		–	–	–	–	–	–	–