UTC Offset
UTC+01:00
Castlereagh, United Kingdom Snapshot 2026
Where is Castlereagh?
Castlereagh, United Kingdom
- Continent
- Europe
- Country
- United Kingdom
- City
- Castlereagh
- Population
- 56.7K
- Coordinates
- 54.57°, -5.88°
Castlereagh is a city in United Kingdom with a population of approximately 56.7K. Average temperatures range from 4°C (40°F) in January to 18°C (64°F) in August. The best time to visit is May, June, July, August, September.
Time in Castlereagh right now
Open full time & time zone page 19:48 48
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 Castlereagh
Daylight in Castlereagh today
View full sunrise & sunset page Sunrise
Sunset
Day length
17h 14m
Climate normals for Castlereagh
Long-term monthly averages based on historical data.
January
Poor 
February
Poor March
Poor April
Fair May best
Fair June best
Good July best
Good August best
Fair September best
Good October
Fair November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 8°C / 4°C | 4°C / 0°C | 12days (64 mm) Wet | 3.7h Poor | 85% Humid | 0.9 Low | Poor | View Details |
| February | 8°C / 4°C | 4°C / 0°C | 13days (73 mm) Wet | 5.1h Fair | 82% Humid | 1.5 Low | Poor | View Details |
| March | 9°C / 5°C | 6°C / 1°C | 14days (70 mm) Wet | 6.8h Fair | 81% Humid | 2.8 Moderate | Poor | View Details |
| April | 11°C / 6°C | 8°C / 3°C | 12days (58 mm) Wet | 8.9h Good | 79% Humid | 4 Moderate | Fair | View Details |
| May best | 14°C / 9°C | 12°C / 6°C | 13days (59 mm) Wet | 10.6h Excellent | 78% Humid | 5.3 High | Fair | View Details |
| June best | 17°C / 12°C | 15°C / 10°C | 15days (73 mm) Wet | 10.2h Excellent | 79% Humid | 5.6 High | Good | View Details |
| July best | 18°C / 13°C | 17°C / 11°C | 14days (83 mm) Wet | 9.2h Good | 81% Humid | 4.9 Moderate | Good | View Details |
| August best | 18°C / 13°C | 17°C / 12°C | 15days (91 mm) Wet | 8.9h Good | 82% Humid | 4.7 Moderate | Fair | View Details |
| September best | 16°C / 12°C | 14°C / 10°C | 14days (86 mm) Wet | 7.3h Good | 82% Humid | 3.3 Moderate | Good | View Details |
| October | 13°C / 10°C | 11°C / 7°C | 14days (88 mm) Wet | 5.2h Fair | 82% Humid | 1.9 Low | Fair | View Details |
| November | 10°C / 7°C | 7°C / 3°C | 13days (80 mm) Wet | 4h Fair | 84% Humid | 1 Low | Poor | View Details |
| December | 9°C / 5°C | 5°C / 1°C | 14days (85 mm) Wet | 2.7h Poor | 87% Very Muggy | 0.6 Low | Poor | View Details |
Monthly Temperatures
HighLow
Line chart showing monthly temperatures. Jan: 8°C / 4°C . Feb: 8°C / 4°C . Mar: 9°C / 5°C . Apr: 11°C / 6°C . May: 14°C / 9°C . Jun: 17°C / 12°C . Jul: 18°C / 13°C . Aug: 18°C / 13°C . Sep: 16°C / 12°C . Oct: 13°C / 10°C . Nov: 10°C / 7°C . Dec: 9°C / 5°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 64 mm. Feb: 73 mm. Mar: 70 mm. Apr: 58 mm. May: 59 mm. Jun: 73 mm. Jul: 83 mm. Aug: 91 mm. Sep: 86 mm. Oct: 88 mm. Nov: 80 mm. Dec: 85 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 85%. Feb: 82%. Mar: 81%. Apr: 79%. May: 78%. Jun: 79%. Jul: 81%. Aug: 82%. Sep: 82%. Oct: 82%. Nov: 84%. Dec: 87%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 24 km/h . Feb: 27 km/h . Mar: 23 km/h . Apr: 21 km/h . May: 19 km/h . Jun: 19 km/h . Jul: 18 km/h . Aug: 20 km/h . Sep: 21 km/h . Oct: 24 km/h . Nov: 23 km/h . Dec: 24 km/h .
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 6. Jul: UV 5. Aug: UV 5. Sep: UV 3. Oct: UV 2. Nov: UV 1. Dec: UV 1.
Frequently Asked Questions
Castlereagh has a population of approximately 56.7K.
The best months to visit Castlereagh are May, June, July, August, September, when temperatures are pleasant and rainfall is lower.
Castlereagh receives approximately 910mm of rainfall annually across 163 rainy days.
Castlereagh is located in United Kingdom, in the Europe region.