Castlewellan, Northern Ireland Climate
United Kingdom
Pop. 2,499 Elev. 113 m / 371 ft
TZ: Europe/London (UTC+1) ·
Castlewellan enjoys a mild climate with limited seasonal extremes, ranging from 39°F (4°C) in January to 65°F (18°C) in August. Precipitation occurs on roughly 73 days per year (41.9 in / 1065 mm total). Overcast skies are common, with only 60 sunny days per year. Ocean water temperatures reach 62°F (17°C) in summer.
| Temperature | 18°C (65°F) high | 4°C (39°F) low |
| Feels like | 1°C (35°F) low | |
| Rain | 73 days | 1065 mm (41.9 in) /yr |
| Sky | 60 sunny | 12 stormy |
| Wind | 2.3 m/s (5.0 mph) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Jul, Aug
Sky & Air by Month
Cloud cover (%)
63
Jan 72
Feb 68
Mar 58
Apr 48
May 73
Jun 74
Jul 68
Aug 71
Sep 79
Oct 71
Nov 72
Dec Humidity (%)
86
Jan 82
Feb 79
Mar 78
Apr 74
May 80
Jun 81
Jul 81
Aug 82
Sep 83
Oct 85
Nov 85
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 40 km George Best Belfast City Airport (BHD)
Ski resort 116 km Ski Club Of Ireland
National park 10 km Blackstaff River
Hospital 18 km Downe Hospital
Hiking trail 3 km Newcastle Way
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 7°C 45°F | 4°C 39°F | 57 mm 2.2 in | 19 mm0.7 in | 7 |
| February | 8°C 47°F | 5°C 41°F | 72 mm 2.8 in | — | 6 |
| March | 10°C 50°F | 6°C 43°F | 24 mm 1.0 in | — | 4 |
| April | 12°C 54°F | 7°C 45°F | 91 mm 3.6 in | — | 9 |
| May | 15°C 59°F | 9°C 49°F | 53 mm 2.1 in | — | 12 |
| June | 16°C 62°F | 12°C 53°F | 120 mm 4.7 in | — | 2 |
| July | 18°C 65°F | 14°C 57°F | 94 mm 3.7 in | — | 4 |
| August | 18°C 65°F | 14°C 57°F | 53 mm 2.1 in | — | 2 |
| September | 15°C 60°F | 11°C 52°F | 139 mm 5.5 in | — | 4 |
| October | 13°C 55°F | 10°C 50°F | 122 mm 4.8 in | — | 1 |
| November | 10°C 50°F | 7°C 44°F | 127 mm 5.0 in | 0 mm0.0 in | 4 |
| December | 9°C 48°F | 6°C 43°F | 112 mm 4.4 in | — | 5 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 7 | 0 |
| February | 6 | 0 |
| March | 4 | 0 |
| April | 9 | 3 |
| May | 12 | 1 |
| June | 2 | 1 |
| July | 4 | 3 |
| August | 2 | 0 |
| September | 4 | 1 |
| October | 1 | 2 |
| November | 4 | 0 |
| December | 5 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 10°C 50°F | 4°C 39°F |
| February | 8°C 47°F | 5°C 41°F |
| March | 9°C 48°F | 7°C 45°F |
| April | 11°C 51°F | 10°C 50°F |
| May | 14°C 57°F | 14°C 57°F |
| June | 15°C 59°F | 15°C 59°F |
| July | 16°C 61°F | 17°C 63°F |
| August | 17°C 62°F | 17°C 62°F |
| September | 15°C 60°F | 13°C 55°F |
| October | 14°C 58°F | 10°C 51°F |
| November | 13°C 55°F | 7°C 45°F |
| December | 11°C 52°F | 6°C 42°F |