UTC Offset
UTC+01:00
Castlerock, United Kingdom Snapshot 2026
Where is Castlerock?
Castlerock, United Kingdom
- Continent
- Europe
- Country
- United Kingdom
- City
- Castlerock
- Population
- 1.5K
- Coordinates
- 55.15°, -6.78°
Castlerock is a city in United Kingdom with a population of approximately 1.5K. Average temperatures range from 5°C (40°F) in February to 17°C (62°F) in August. The best time to visit is June, July, August, September.
Time in Castlerock right now
Open full time & time zone page 19:11 11
Monday, June 15, 2026
IANA time zone
Europe/London
Daylight saving
DST in effect
GMT / BST
Next DST change
October 25
backward -1h
Live weather in Castlerock
Daylight in Castlerock today
View full sunrise & sunset page Sunrise
Sunset
Day length
17h 22m
Climate normals for Castlerock
Long-term monthly averages based on historical data.
January
Poor 
February
Poor March
Poor April
Poor May
Fair June best
Good July best
Fair August best
Wet September best
Fair October
Poor November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 8°C / 5°C | 3°C / 0°C | 16days (81 mm) Wet | 3.5h Poor | 83% Humid | 0.8 Low | Poor | View Details |
| February | 8°C / 5°C | 3°C / 0°C | 15days (89 mm) Wet | 5.1h Fair | 80% Humid | 1.5 Low | Poor | View Details |
| March | 9°C / 5°C | 5°C / 1°C | 16days (77 mm) Wet | 6.8h Fair | 80% Humid | 2.6 Moderate | Poor | View Details |
| April | 10°C / 6°C | 7°C / 2°C | 15days (69 mm) Wet | 9.1h Good | 79% Humid | 4 Moderate | Poor | View Details |
| May | 13°C / 9°C | 11°C / 6°C | 13days (72 mm) Wet | 10.6h Excellent | 80% Humid | 5.2 High | Fair | View Details |
| June best | 15°C / 11°C | 14°C / 9°C | 16days (86 mm) Wet | 10h Excellent | 81% Humid | 5.4 High | Good | View Details |
| July best | 16°C / 13°C | 15°C / 11°C | 16days (96 mm) Wet | 9.1h Good | 83% Humid | 5 Moderate | Fair | View Details |
| August best | 17°C / 13°C | 15°C / 11°C | 18days (106 mm) Wet | 8.9h Good | 83% Humid | 4.6 Moderate | Wet | View Details |
| September best | 15°C / 12°C | 13°C / 9°C | 16days (88 mm) Wet | 7h Good | 82% Humid | 3.4 Moderate | Fair | View Details |
| October | 13°C / 10°C | 10°C / 6°C | 17days (100 mm) Wet | 5.1h Fair | 82% Humid | 1.8 Low | Poor | View Details |
| November | 10°C / 7°C | 6°C / 3°C | 17days (92 mm) Wet | 3.9h Poor | 82% Humid | 1 Low | Poor | View Details |
| December | 8°C / 6°C | 5°C / 1°C | 16days (95 mm) Wet | 2.6h Poor | 85% Humid | 0.6 Low | Poor | View Details |
Monthly Temperatures
HighLow
Line chart showing monthly temperatures. Jan: 8°C / 5°C . Feb: 8°C / 5°C . Mar: 9°C / 5°C . Apr: 10°C / 6°C . May: 13°C / 9°C . Jun: 15°C / 11°C . Jul: 16°C / 13°C . Aug: 17°C / 13°C . Sep: 15°C / 12°C . Oct: 13°C / 10°C . Nov: 10°C / 7°C . Dec: 8°C / 6°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 81 mm. Feb: 89 mm. Mar: 77 mm. Apr: 69 mm. May: 72 mm. Jun: 86 mm. Jul: 96 mm. Aug: 106 mm. Sep: 88 mm. Oct: 100 mm. Nov: 92 mm. Dec: 95 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 83%. Feb: 80%. Mar: 80%. Apr: 79%. May: 80%. Jun: 81%. Jul: 83%. Aug: 83%. Sep: 82%. Oct: 82%. Nov: 82%. Dec: 85%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 27 km/h . Feb: 29 km/h . Mar: 25 km/h . Apr: 22 km/h . May: 20 km/h . Jun: 20 km/h . Jul: 19 km/h . Aug: 21 km/h . Sep: 23 km/h . Oct: 26 km/h . Nov: 25 km/h . Dec: 27 km/h .
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 8°C . Feb: 8°C . Mar: 8°C . Apr: 10°C . May: 12°C . Jun: 15°C . Jul: 16°C . Aug: 16°C . Sep: 15°C . Oct: 13°C . Nov: 12°C . Dec: 10°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 1. Feb: UV 2. Mar: UV 3. Apr: UV 4. May: UV 5. Jun: UV 5. Jul: UV 5. Aug: UV 5. Sep: UV 3. Oct: UV 2. Nov: UV 1. Dec: UV 1.
Frequently Asked Questions
Castlerock has a population of approximately 1.5K.
The best months to visit Castlerock are June, July, August, September, when temperatures are pleasant and rainfall is lower.
Castlerock receives approximately 1051mm of rainfall annually across 191 rainy days.
Castlerock is located in United Kingdom, in the Europe region.