Castlereagh weather in July

In July, Castlereagh sees average daytime highs of 18°C and overnight lows near 12°C, with 81 mm of rain across 14.6 wet days and about 16.4 hours of daylight. It is the 1st-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 18°C through the month. The sky is clear or mostly clear about 6% of the time in July, and the air most often feels dry.

Daylight stretches from about 16 h 54 min at the start of July to 15 h 42 min by month's end. Set against the rest of the year, July is Castlereagh's 12th-clearest and 12th-windiest month. For the whole year in context, see Castlereagh's year-round climate.

Daytime high
18°
1st warmest
Overnight low
12°
12th coldest
Rainfall
81 mm
14.6 wet days
Daylight
16 h 30 min
4:14 AM – 8:44 PM
Cloud cover
79%
12th clearest
Wind
13 km/h
12th windiest
Solar energy
4.49 kWh/m²
Travel score
4.9
out of 10

Castlereagh is settlement near Belfast in Northern Ireland, UK.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 18°C through the month.

A typical July day in Castlereagh reaches about 18°C in the afternoon and slips back to 12°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 21°C. Set against its neighbours, July runs about 2°C warmer than June and on par with August.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11712
21712
31712
41712
51712
61712
71712
81712
91712
101712
111712
121812
131812
141812
151812
161812
171812
181812
191812
201812
211813
221813
231813
241813
251813
261813
271813
281813
291813
301813
311813

How July really feels in Castlereagh

Once humidity and wind are folded in, July averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

July sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Castlereagh weather by month

How July compares with the rest of the year at a glance. July is the 1st-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 7714.20.87.61.0
Feb / 6212.10.99.31.1
Mar / 6213.40.611.51.6
Apr11° / 65130.213.72.5
May14° / 7014.10.115.83.5
Jun16° / 11°7513.2016.94.4
Jul18° / 12°8114.6016.44.9
Aug18° / 12°8114.2014.74.9
Sep16° / 11°7012.5012.54.4
Oct13° / 8713.5010.23.1
Nov10° / 85140.28.21.9
Dec / 8213.50.57.11.2

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in July, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 11% of July, with mostly cloudy or overcast conditions the remaining 83%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11684
21684
31684
41684
51684
61684
71585
81585
91585
101585
111585
121585
131684
141684
151783
161783
171783
181882
191981
201981
211882
221882
231882
241882
251882
261783
271684
281684
291684
301585
311684

Chance of precipitation in July

Any precipitation

Castlereagh gets around 81 mm of rain over 14.6 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 46% and peaks near 49% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
146
246
346
446
546
646
747
847
947
1047
1147
1246
1346
1446
1546
1645
1745
1845
1945
2045
2145
2246
2346
2446
2547
2647
2748
2848
2948
3049
3149

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

Most of July feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, July lands in the dry band about 70% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
181181
280191
379201
479201
578211
678211
777221
876231
976231
1075241
1174251
1274251
1372262
1471272
1570282
1670282
1769292
1868302
1968302
2066313
2165323
2264333
2364333
2463343
2562353
2662353
2761363
2861363
2961363
3061363
3161363

Wind in July

Winds average 13 km/h in July, the calmest month.

Across July, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in July

DaylightNight

Daylight runs from about 16 h 54 min at the start of July to 15 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over July. Sunrise moves from 3:59 AM to 4:38 AM, and sunset from 8:55 PM to 8:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
116.93:598:55
216.93:598:55
316.94:008:54
416.94:018:54
516.94:028:53
616.84:038:53
716.84:048:52
816.84:058:51
916.74:068:51
1016.74:078:50
1116.74:088:49
1216.64:098:48
1316.64:108:47
1416.64:128:46
1516.54:138:45
1616.54:148:44
1716.54:168:43
1816.44:178:42
1916.44:188:40
2016.34:208:39
2116.34:218:38
2216.24:238:36
2316.24:248:35
2416.14:268:33
2516.14:288:32
2616.04:298:30
2716.04:318:29
2815.94:328:27
2915.94:348:25
3015.84:368:23
3115.74:388:22

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 4.49 kWh/m².

For context, solar energy here swings from a low near 0.47 kWh/m² to a high of 4.95 kWh/m² in May across the year — July's 4.49 kWh/m² sits near the top of that range.

024151015202531
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.7Bright
54.6Bright
64.6Bright
74.6Bright
84.6Bright
94.6Bright
104.6Bright
114.6Bright
124.6Bright
134.6Bright
144.5Bright
154.5Bright
164.5Bright
174.5Bright
184.5Bright
194.5Bright
204.5Bright
214.5Bright
224.4Bright
234.4Bright
244.4Bright
254.3Bright
264.3Bright
274.3Bright
284.2Bright
294.2Bright
304.2Bright
314.1Bright
Planning a trip in July

Is July a good time to visit Castlereagh?

Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.9
Sightseeing
1st-best month of the year
1.5
Beach & pool
1st-best month of the year

July is a reasonable time to visit Castlereagh for sightseeing.

What to pack for Castlereagh in July

From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In July, Castlereagh sees daytime highs around 18°C and nights near 12°C. Pack rain gear. About 15 days see rain.

rain gear

Sea temperature near Castlereagh in July

The nearest coast averages about 13°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 33 km away) is warmest in August at about 14°C and coldest in March near 8°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

6°8°10°12°14°16°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan9Bracing
Feb8Bracing
Mar8Bracing
Apr8Bracing
May10Bracing
Jun12Bracing
Jul13Bracing
Aug14Bracing
Sep14Bracing
Oct14Bracing
Nov12Bracing
Dec11Bracing

UV index in Castlereagh in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Castlereagh peaks around July 24 at about 5 (high) — a little sun protection helps at midday. It bottoms out near January 1 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 5 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 24UV 5Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5High
Jun5High
Jul5High
Aug5High
Sep3Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Castlereagh?

Castlereagh sits at 54.6°N, 5.9°W, 29 m above sea level, in United Kingdom. The nearest listed city is Belfast, 4.0 km away.

Topography around Castlereagh

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Castlereagh.

Within 3 km, the terrain around Castlereagh has only modest variations in elevation — a maximum elevation change of 178 m around an average of 61 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 495 m; within 80 km, large variations in elevation — a maximum elevation change of 860 m.

The land around Castlereagh is covered by artificial surfaces (41%), grassland (32%) and trees (24%) within 3 km, grassland (55%) within 16 km, and water (47%) and grassland (46%) within 80 km.

3 km
178 m
16 km
495 m
80 km
860 m
treesgrasslandcroplandartificial surfaceswater
July weather nearby: Belfast 4.0 km · Newtownabbey 10 km · Lisburn 11 km · Newtownards 13 km · Carrickfergus 17 km · Bangor 17 km · Antrim 26 km · Larne 31 km

United Kingdom travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type D / G / M
230 V · 50 Hz
Prices
≈ 89% of US
price level, 2025
GDP per capita
$57,602
2025
Happiness
6.7 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2021
Road deaths
3.2
per 100k/yr, 2019
Income group
High
World Bank
Religion
Christian 60%none 26%Muslim 4%other 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Castlereagh (54.5735°, -5.8847°, elevation 29 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).