Newtownabbey weather in September

In September, Newtownabbey sees average daytime highs of 16°C and overnight lows near 11°C, with 71 mm of rain across 13 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 16°C in the first days to 14°C by the end. The sky is clear or mostly clear about 8% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 36 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Newtownabbey's 9th-clearest and 8th-windiest month. For the whole year in context, see Newtownabbey's year-round climate.

Daytime high
16°
4th warmest
Overnight low
11°
10th coldest
Rainfall
71 mm
13 wet days
Daylight
12 h 24 min
6:05 AM – 6:31 PM
Cloud cover
77%
9th clearest
Wind
16 km/h
8th windiest
Solar energy
2.75 kWh/m²
Travel score
4.2
out of 10

Newtownabbey is suburb of Belfast, Northern Ireland.

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 16°C in the first days to 14°C by the end.

A typical September day in Newtownabbey reaches about 16°C in the afternoon and slips back to 11°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 18°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

10°15°20°151015202530
Avg high (°C)Avg low (°C)
11712
21711
31611
41611
51611
61611
71611
81611
91611
101611
111611
121611
131611
141611
151611
161511
171511
181510
191510
201510
211510
221510
231510
241510
251510
261510
271510
281410
291410
301410

How September really feels in Newtownabbey

Once humidity and wind are folded in, September 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

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

Newtownabbey weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 7914.91.27.60.9
Feb / 6412.91.49.31.0
Mar / 6414.20.811.51.5
Apr11° / 6513.40.213.72.4
May13° / 7114.3015.83.3
Jun16° / 10°7813.7016.94.2
Jul17° / 12°8515.3016.54.7
Aug17° / 12°8514.7014.74.7
Sep16° / 11°7113012.54.2
Oct13° / 8914010.23.0
Nov10° / 8614.60.28.21.8
Dec / 8413.90.67.11.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 78%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12278
22179
32179
42179
52080
62080
72080
82080
92080
102080
112080
122179
132179
142278
152278
162278
172476
182476
192476
202476
212476
222476
232476
242476
252476
262476
272476
282476
292476
302476

Chance of precipitation in September

Any precipitation

Newtownabbey gets around 71 mm of rain over 13 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 44% and peaks near 47% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
143
243
343
443
544
644
744
844
944
1044
1144
1244
1343
1443
1543
1642
1742
1842
1942
2042
2142
2242
2343
2443
2544
2645
2746
2847
2947
3047

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
180191
280191
381181
481181
581181
682171
782171
883161
983161
1084151
1185141
1285141
1387130
1488120
1588120
1688120
1789110
1889110
1989110
2089110
2190100
2290100
2390100
2490100
2590100
269190
279190
289190
299280
309280

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2817light breeze
2917light breeze
3017light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 36 min at the start of September to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 132 minutes over September. Sunrise moves from 5:36 AM to 6:32 AM, and sunset from 7:10 PM to 5:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:367:10
213.55:387:08
313.45:407:05
413.35:427:03
513.35:447:00
613.25:466:57
713.15:486:55
813.05:506:52
913.05:526:49
1012.95:536:47
1112.85:556:44
1212.75:576:42
1312.75:596:39
1412.66:016:36
1512.56:036:34
1612.46:056:31
1712.46:076:28
1812.36:096:26
1912.26:116:23
2012.16:126:20
2112.16:146:18
2212.06:166:15
2311.96:186:13
2411.86:206:10
2511.86:226:07
2611.76:246:05
2711.66:266:02
2811.56:285:59
2911.56:305:57
3011.46:325:54

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.75 kWh/m².

For context, solar energy here swings from a low near 0.46 kWh/m² to a high of 5.07 kWh/m² in May across the year — September's 2.75 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.3Moderate
23.3Moderate
33.3Moderate
43.2Moderate
53.2Moderate
63.1Moderate
73.1Moderate
83.0Moderate
93.0Moderate
103.0Moderate
112.9Moderate
122.9Moderate
132.9Moderate
142.8Moderate
152.8Moderate
162.8Moderate
172.7Moderate
182.7Moderate
192.6Moderate
202.6Moderate
212.5Moderate
222.5Moderate
232.5Moderate
242.4Moderate
252.4Moderate
262.3Moderate
272.3Moderate
282.2Moderate
292.2Moderate
302.1Moderate
Planning a trip in September

Is September a good time to visit Newtownabbey?

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

4.2
Sightseeing
3rd-best month of the year
Beach & pool
never really warm enough

September is a reasonable time to visit Newtownabbey for sightseeing.

What to pack for Newtownabbey in September

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

In September, Newtownabbey sees daytime highs around 16°C and nights near 11°C. Worth packing: a warm layer and rain gear. About 13 days see rain.

a warm layerrain gear

Sea temperature near Newtownabbey in September

The nearest coast averages about 14°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 24 km away) is warmest in September 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
May9Bracing
Jun11Bracing
Jul12Bracing
Aug13Bracing
Sep14Bracing
Oct14Bracing
Nov12Bracing
Dec11Bracing

UV index in Newtownabbey in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Newtownabbey peaks around May 22 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowMay 22UV 5Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5High
Jun5High
Jul5High
Aug5Moderate
Sep3Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Newtownabbey?

Newtownabbey sits at 54.7°N, 5.9°W, 15 m above sea level, in United Kingdom. The nearest listed city is Belfast, 7.0 km away.

Topography around Newtownabbey

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

Within 3 km, the terrain around Newtownabbey has significant variations in elevation — a maximum elevation change of 362 m around an average of 46 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 Newtownabbey is covered by water (38%) and trees (24%) within 3 km, grassland (56%) within 16 km, and grassland (47%) and water (46%) within 80 km.

3 km
362 m
16 km
495 m
80 km
860 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Belfast 7.0 km · Carrickfergus 9.0 km · Castlereagh 10 km · Bangor 15 km · Newtownards 16 km · Lisburn 17 km · Antrim 20 km · Larne 22 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 Newtownabbey (54.6598°, -5.9086°, elevation 15 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).