St. Mary's, Isles of Scilly weather by month & the best time to visit
🇬🇧 United Kingdom · seaside town · oceanic / maritime climate
The best time to visit St. Mary's, Isles of Scilly is August — its sunniest month (Sunshine Score 58/100), with July and September close behind. St. Mary's, Isles of Scilly averages about 1,869 hours of sunshine a year. Daytime highs around 17°C / 63°F and roughly 70 mm of rain in August.
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- Sun hours / year
- 1,869
- Sunniest month
- August
- Peak score
- 58/100
- Rain / year
- 1,006 mm
- Midday UV at peak
- 6 (high)
- Sea at warmest
- 17°C / 63°F
- Population
- 43k
- Elevation
- 33 m
When is the best time to visit St. Mary's, Isles of Scilly?
For sunshine, the best time to visit St. Mary's, Isles of Scilly is August, then July and September. The dullest month is January (12/100, 107 mm of rain). The full month-by-month picture is in the table below.
How sunny is St. Mary's, Isles of Scilly?
St. Mary's, Isles of Scilly gets a moderate 1,869 hours of sunshine a year. 46 Sunshine Score points separate August (58) from January (12), so the month you pick matters. It ranks #3 of 48 destinations in United Kingdom for annual sunshine, above the national median of 1,345 hours. The year's 1,006 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 12 | 10° / 50°F | 9° / 48°F | 107 mm | 0 | 11° / 52°F |
| February | 12 | 10° / 50°F | 8° / 46°F | 87 mm | 1 | 11° / 52°F |
| March | 12 | 10° / 50°F | 8° / 46°F | 81 mm | 2 | 11° / 52°F |
| April | 19 | 11° / 52°F | 9° / 48°F | 64 mm | 4 | 11° / 52°F |
| May | 26 | 12° / 54°F | 11° / 52°F | 63 mm | 5 | 14° / 57°F |
| June | 45 | 15° / 59°F | 14° / 57°F | 63 mm | 6 | 15° / 59°F |
| July | 57 | 17° / 63°F | 16° / 61°F | 77 mm | 6 | 16° / 61°F |
| August | 58 | 17° / 63°F | 16° / 61°F | 70 mm | 5 | 17° / 63°F |
| September | 52 | 16° / 61°F | 15° / 59°F | 64 mm | 4 | 16° / 61°F |
| October | 35 | 14° / 57°F | 13° / 55°F | 105 mm | 2 | 14° / 57°F |
| November | 23 | 12° / 54°F | 11° / 52°F | 112 mm | 1 | 14° / 57°F |
| December | 17 | 11° / 52°F | 10° / 50°F | 113 mm | 0 | 12° / 54°F |
Sea temperature in St. Mary's, Isles of Scilly by month
The sea off St. Mary's, Isles of Scilly is warmest in August at around 17°C / 63°F, and coolest in January at 11°C / 52°F. It never reaches comfortable swimming temperatures (21°C+). Month-by-month sea-surface temperatures are in the Sea column of the table above.
See St. Mary's, Isles of Scilly on the interactive sunshine globe →
Nearby places for sunshine
- Newquay United Kingdom · 109 km · best in Jul · 1,788 h sun/yr
- Brest France · 212 km · best in Jul · 1,927 h sun/yr
- Exeter United Kingdom · 224 km · best in Jul · 1,796 h sun/yr
- Cork Ireland · 264 km · best in Jul · 1,693 h sun/yr
- Cardiff United Kingdom · 265 km · best in Jul · 1,565 h sun/yr
- Saint Peter Port Guernsey · 271 km · best in Sep · 1,931 h sun/yr
Nearest destinations
- Land's End United Kingdom · 49 km · 1,786 h sun/yr · best in Aug
- Ushant France · 184 km · 1,927 h sun/yr · best in Jul
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