Finglas weather in September

In September, Finglas sees average daytime highs of 17°C and overnight lows near 11°C, with 64 mm of rain across 11.5 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 18°C in the first days to 15°C by the end. The sky is clear or mostly clear about 9% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 30 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Finglas's 9th-clearest and 8th-windiest month. For the whole year in context, see Finglas's year-round climate.

Daytime high
17°
4th warmest
Overnight low
11°
10th coldest
Rainfall
64 mm
11.5 wet days
Daylight
12 h 24 min
6:07 AM – 6:32 PM
Cloud cover
76%
9th clearest
Wind
16 km/h
8th windiest
Solar energy
2.9 kWh/m²
Travel score
4.9
out of 10

Finglas is suburb in Dublin, 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 18°C in the first days to 15°C by the end.

A typical September day in Finglas reaches about 17°C in the afternoon and slips back to 11°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 19°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11812
21812
31812
41812
51812
61712
71712
81712
91712
101711
111711
121711
131711
141711
151711
161711
171611
181611
191611
201611
211611
221611
231610
241610
251610
261610
271610
281510
291510
301510

How September really feels in Finglas

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.

Finglas weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6312.30.67.81.3
Feb / 5011.10.99.41.4
Mar10° / 5211.70.711.52.0
Apr12° / 5812.6013.72.8
May14° / 5912.7015.63.9
Jun17° / 11°6711.7016.75.0
Jul19° / 13°7013.6016.25.3
Aug19° / 13°7212.4014.65.4
Sep17° / 11°6411.5012.54.9
Oct14° / 7111.5010.33.6
Nov10° / 8012.90.28.42.2
Dec / 7012.10.47.31.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 9% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 77%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12080
22179
32179
42179
52179
62377
72377
82476
92476
102476
112476
122476
132575
142476
152575
162575
172575
182476
192575
202575
212476
222377
232278
242278
252278
262278
272278
282278
292377
302278

Chance of precipitation in September

Any precipitation

Finglas gets around 64 mm of rain over 11.5 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 37% and peaks near 41% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
134
234
334
434
535
635
736
836
936
1036
1136
1236
1336
1436
1537
1637
1737
1837
1937
2037
2138
2239
2339
2440
2540
2641
2741
2841
2941
3041

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 82% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
172253
272253
373243
473243
574233
675223
775223
876213
977203
1079192
1180182
1281172
1382162
1483161
1584151
1684151
1785141
1886140
1986140
2087130
2187130
2287130
2387130
2487130
2588120
2688120
2788120
2889110
2989110
3090100

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 16 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
615light breeze
715light 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
2816light breeze
2916light breeze
3016light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 30 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 126 minutes over September. Sunrise moves from 5:40 AM to 6:32 AM, and sunset from 7:10 PM to 5:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:407:10
213.45:427:07
313.35:447:05
413.35:467:02
513.25:477:00
613.15:496:57
713.15:516:55
813.05:536:52
912.95:546:50
1012.85:566:47
1112.85:586:45
1212.76:006:42
1312.66:026:40
1412.66:036:37
1512.56:056:35
1612.46:076:32
1712.36:096:29
1812.36:116:27
1912.26:126:24
2012.16:146:22
2112.16:166:19
2212.06:186:17
2311.96:206:14
2411.86:216:12
2511.86:236:09
2611.76:256:07
2711.66:276:04
2811.56:296:02
2911.56:315:59
3011.46:325:57

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.9 kWh/m².

For context, solar energy here swings from a low near 0.54 kWh/m² to a high of 5.22 kWh/m² in June across the year — September's 2.9 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.5Moderate
23.5Moderate
33.4Moderate
43.4Moderate
53.3Moderate
63.3Moderate
73.3Moderate
83.2Moderate
93.2Moderate
103.1Moderate
113.1Moderate
123.1Moderate
133.0Moderate
143.0Moderate
152.9Moderate
162.9Moderate
172.9Moderate
182.8Moderate
192.8Moderate
202.7Moderate
212.7Moderate
222.6Moderate
232.6Moderate
242.6Moderate
252.5Moderate
262.5Moderate
272.4Moderate
282.4Moderate
292.3Moderate
302.3Moderate
Planning a trip in September

Is September a good time to visit Finglas?

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

4.9
Sightseeing
4th-best month of the year
1.0
Beach & pool
4th-best month of the year

September is a reasonable time to visit Finglas for sightseeing.

What to pack for Finglas in September

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

In September, Finglas sees daytime highs around 17°C and nights near 11°C. Worth packing: a warm layer and rain gear. About 12 days see rain.

a warm layerrain gear

Sea temperature near Finglas in September

The nearest coast averages about 15°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 15°C and coldest in March near 8°C.

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

10°15°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan9Bracing
Feb8Bracing
Mar8Bracing
Apr9Bracing
May11Bracing
Jun13Bracing
Jul15Bracing
Aug15Cool
Sep15Bracing
Oct13Bracing
Nov12Bracing
Dec11Bracing

UV index in Finglas in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Finglas peaks around August 13 at about 6 (high) — a little sun protection helps at midday. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 13UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5High
Jun6High
Jul5High
Aug6High
Sep4Moderate
Oct2Low
Nov1Low
Dec1Low
Location & terrain

Where is Finglas?

Finglas sits at 53.4°N, 6.3°W, 59 m above sea level, in Ireland. The nearest listed city is Blanchardstown, 5.0 km away.

Topography around Finglas

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

Within 3 km, the terrain around Finglas has only modest variations in elevation — a maximum elevation change of 87 m around an average of 56 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 438 m; within 80 km, large variations in elevation — a maximum elevation change of 946 m.

The land around Finglas is covered by artificial surfaces (48%) and grassland (27%) within 3 km, grassland (32%) and artificial surfaces (24%) within 16 km, and grassland (53%) and water (26%) within 80 km.

3 km
87 m
16 km
438 m
80 km
946 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Blanchardstown 5.0 km · Dublin 7.0 km · Donaghmede 9.0 km · Swords 9.0 km · Rathfarnham 10 km · Templeogue 10 km · Lucan 11 km · South Dublin 11 km

Ireland travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type G
230 V · 50 Hz
Prices
≈ 85% of US
price level, 2025
GDP per capita
$131,592
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
96%
of population, 2024
Homicide rate
0.7
per 100k, 2023
Road deaths
3.1
per 100k/yr, 2019
Income group
High
World Bank
Religion
Roman Catholic 69%none 15%Protestant 4%Orthodox 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 Finglas (53.3892°, -6.2969°, elevation 59 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).