14 °C down to about 56 m. No thermocline above that.
Suit: 7 mm with hood, or drysuit for the whole dive.
Model estimate (Copernicus Marine), updated Sat 14 Nov. High confidence.
Grassholm scuba diving weather
Boat dive · Skomer and Marloes, Pembrokeshire · Show on map
Hour by hour today
Tap an hour to see it above
| Time | Score | Waves | Wind (gusts) | Current | Swell | Tide | Water | Air | Rain | Limited by |
|---|---|---|---|---|---|---|---|---|---|---|
| 1.8 m | 22 (29 kn) ↓ | 0.8 kn | 0.6 m · 10 s ↓ | ↑ rising | 14.0 °C | 12 °C | – | waves | ||
| 1.8 m | 21 (29 kn) ↓ | 1.0 kn | 0.7 m · 10 s ↓ | ↑ rising | 14.0 °C | 12 °C | – | waves | ||
| 1.8 m | 21 (29 kn) ↓ | 1.0 kn | 0.7 m · 10 s ↓ | ↑ rising | 14.0 °C | 12 °C | – | waves | ||
| 1.8 m | 22 (29 kn) ↓ | 0.7 kn | 0.7 m · 10 s ↓ | ↑ rising | 14.0 °C | 12 °C | – | waves | ||
| 1.8 m | 22 (30 kn) ↓ | 0.5 kn | 0.7 m · 9 s ↓ | ↑ rising | 14.0 °C | 12 °C | – | waves | ||
| 1.8 m | 22 (29 kn) ↓ | 1.0 kn | 0.7 m · 9 s ↓ | High ~20:51 | 14.0 °C | 12 °C | – | waves | ||
| 1.8 m | 20 (27 kn) ↓ | 1.5 kn | 0.7 m · 8 s ↓ | ↓ falling | 13.9 °C | 12 °C | – | waves |
Waves and swell are adjusted for this site's shelter from the coastline. Arrows point where the wind and swell go. Night hours are shaded. Tide times come from an ocean model: usually within about half an hour, more in complex waters. Check official tide tables.
Water at depth
14 °C down to about 56 m. No thermocline above that.
Suit: 7 mm with hood, or drysuit for the whole dive.
Model estimate (Copernicus Marine), updated Sat 14 Nov. High confidence.
14 °C down to about 56 m. No thermocline above that.
Suit: 7 mm with hood, or drysuit for the whole dive.
Model estimate (Copernicus Marine), updated Sat 14 Nov. High confidence.
14 °C down to about 56 m. No thermocline above that.
Suit: 7 mm with hood, or drysuit for the whole dive.
Model estimate (Copernicus Marine), updated Sat 14 Nov. Medium confidence.
14 °C down to about 56 m. No thermocline above that.
Suit: 7 mm with hood, or drysuit for the whole dive.
Model estimate (Copernicus Marine), updated Sat 14 Nov. Medium confidence.
14 °C down to about 56 m. No thermocline above that.
Suit: 7 mm with hood, or drysuit for the whole dive.
Model estimate (Copernicus Marine), updated Sat 14 Nov. Trend only.
14 °C down to about 56 m. No thermocline above that.
Suit: 7 mm with hood, or drysuit for the whole dive.
Model estimate (Copernicus Marine), updated Sat 14 Nov. Trend only.
13 °C down to about 56 m. No thermocline above that.
Suit: 7 mm with hood, or drysuit for the whole dive.
Model estimate (Copernicus Marine), updated Sat 14 Nov. Trend only.
13 °C down to about 56 m. No thermocline above that.
Suit: 7 mm with hood, or drysuit for the whole dive.
Model estimate (Copernicus Marine), updated Sat 14 Nov. Trend only.
13 °C down to about 56 m. No thermocline above that.
Suit: 7 mm with hood, or drysuit for the whole dive.
Model estimate (Copernicus Marine), updated Sat 14 Nov. Trend only.
Temperature profile and next days
| Day | Surface | Warm to |
|---|---|---|
| Sat 14 Nov | 14.0 °C | ~56 m |
| Sun 15 Nov | 13.9 °C | ~56 m |
| Mon 16 Nov | 13.7 °C | ~56 m |
| Tue 17 Nov | 13.7 °C | ~56 m |
| Wed 18 Nov | 13.6 °C | ~56 m |
| Thu 19 Nov | 13.6 °C | ~56 m |
| Fri 20 Nov | 13.5 °C | ~56 m |
| Sat 21 Nov | 13.4 °C | ~56 m |
| Sun 22 Nov | 13.4 °C | ~56 m |
| Mon 23 Nov | 13.2 °C | ~56 m |
~9 km model grid; nearest model water 1.9 km away. Daily averages; the thermocline can move several metres day to day.
Conditions at Grassholm
Grassholm is open to the sea from the ESE–WSW, WNW–ENE, so waves build there when the wind blows from those directions. Land shelters it from the W.
Over the next 7 days no day looks good: Sat, Tue and Wed are a no-go (waves). Thu and Fri are only a trend so far.
When it's rough here, try Lucy (wreck) (14 km, sheltered from the ESE–WSW).
The water is 14 °C at the surface and stays warm past 56 m, so a 7 mm with hood, or drysuit suits most dives.
Shelter
Open to ESE–WSW, WNW–ENE. Waves and swell from there reach the site.
Sheltered from W: land blocks the waves.
Computed from the OpenStreetMap coastline. Wind itself is not reduced by shelter.
Location
Open Grassholm on the map51.7312, -5.4725Nearby dive sites
Scores are today's best daylight hour.
About this forecast
Updated Sat 14 Nov, 15:30 · weather run 06Z 14 Nov · waves run 00Z 14 Nov
Waves are adjusted for this site's shelter from the coastline.
Tides come from a coarse ocean model. The range, and whether tides are bigger or smaller this week, are about right. Times are usually within about half an hour, but complex tides (the Solent, Portland, narrow straits) are poor. Slack water isn't in the score yet: plan with official tide tables and local advice.
Water temperature in Pembrokeshire
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