Dublin weather in September

In September, Dublin sees average daytime highs of 76°F and overnight lows near 57°F, with 2.9 in of rain across 8.3 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 80°F in the first days to 72°F by the end. The sky is clear or mostly clear about 39% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Dublin's 1st-clearest and 10th-windiest month. For the whole year in context, see Dublin's year-round climate.

Daytime high
76°
4th warmest
Overnight low
57°
9th coldest
Rainfall
2.9 in
8.3 wet days
Daylight
12 h 18 min
6:19 AM – 6:35 PM
Cloud cover
51%
1st clearest
Wind
6 mph
10th windiest
Solar energy
4.49 kWh/m²
Travel score
7.1
out of 10

Dublin is city in Ohio, United States.

Density
700/km²
people per km²
Founded
1987

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 80°F in the first days to 72°F by the end.

A typical September day in Dublin reaches about 76°F in the afternoon and slips back to 57°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 66°F and 86°F. Set against its neighbours, September runs about 6°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18162
28062
38061
48061
58061
67960
77960
87960
97859
107859
117858
127858
137758
147757
157657
167656
177656
187556
197555
207555
217455
227454
237454
247353
257353
267253
277252
287252
297151
307151

How September really feels in Dublin

Once humidity and wind are folded in, September averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
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.

Dublin weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan37° / 22°3.310.75.29.50.0
Feb40° / 25°2.79.34.410.40.1
Mar50° / 33°3.811.22.611.72.1
Apr62° / 43°4.512.40.5135.0
May72° / 53°4.413.3014.26.1
Jun80° / 62°4.011.9014.86.2
Jul83° / 66°3.411.2014.65.6
Aug82° / 64°2.99.7013.66.3
Sep76° / 57°2.98.3012.37.1
Oct64° / 45°2.990.210.95.8
Nov51° / 35°3.19.419.82.5
Dec41° / 28°3.410.33.19.20.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 44%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25842
35842
45941
55941
65941
75941
85842
95842
105842
115743
125743
135743
145644
155644
165545
175545
185644
195545
205545
215545
225545
235545
245644
255545
265545
275545
285545
295545
305545

Chance of precipitation in September

Any precipitation

Dublin gets around 2.9 in of rain over 8.3 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 28% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
328
428
528
627
727
827
927
1026
1126
1227
1327
1427
1527
1627
1727
1828
1928
2028
2128
2228
2329
2429
2529
2629
2728
2828
2928
3028

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 46% of days. Sticky, muggy-or-worse air turns up on roughly 15% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1232422256
2242521246
3262521235
4272520225
5292520214
6312519204
7322619194
8342619183
9362618173
10372618162
11392618162
12402618152
13422517141
14442517131
15452517131
16472416121
17492416110
18522315100
19532215100
2054221590
2157211480
2258201480
2360201370
2461191370
2562191360
2664181260
2766171250
2867171150
2968161150
3069161140

Wind in September

Winds average 6 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 6:04 AM to 6:33 AM, and sunset from 7:00 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:047:00
212.96:056:58
312.86:066:57
412.86:076:55
512.86:086:53
612.76:096:52
712.76:106:50
812.66:116:48
912.66:126:47
1012.56:136:45
1112.56:146:43
1212.46:156:41
1312.46:166:40
1412.46:176:38
1512.36:186:36
1612.36:196:35
1712.26:206:33
1812.26:216:31
1912.16:226:29
2012.16:236:28
2112.06:246:26
2212.06:256:24
2311.96:266:22
2411.96:276:21
2511.96:286:19
2611.86:296:17
2711.86:306:16
2811.76:316:14
2911.76:326:12
3011.66:336:11

Solar energy in September

Daily solar energy (kWh/m²)

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

For context, solar energy here swings from a low near 1.61 kWh/m² to a high of 6.22 kWh/m² in June across the year — September's 4.49 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
44.9Bright
54.9Bright
64.9Bright
74.8Bright
84.8Bright
94.8Bright
104.7Bright
114.7Bright
124.7Bright
134.6Bright
144.6Bright
154.5Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.1Bright
254.1Bright
264.0Bright
274.0Bright
284.0Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Is September a good time to visit Dublin?

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

7.1
Sightseeing
1st-best month of the year
6.1
Beach & pool
4th-best month of the year

September is one of the better times to visit Dublin for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Dublin in September

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

In September, Dublin sees daytime highs around 76°F and nights near 57°F. Worth packing: light clothes and rain gear. About 8 days see rain.

light clothesrain gear

UV index in Dublin in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Dublin peaks around June 21 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 21UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun10Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov3Moderate
Dec2Low

Air quality in Dublin in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Dublin is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (October, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1117 µg/m³Oct 238 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar11Good
Apr12Good
May14Moderate
Jun17Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec8Good
Location & terrain

Where is Dublin?

Dublin sits at 40.1°N, 83.1°W, 830 ft above sea level, in United States. The nearest listed city is Hilliard, 5.0 mi away.

Topography around Dublin

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Dublin.

Within 2 miles, the terrain around Dublin has only modest variations in elevation — a maximum elevation change of 236 ft around an average of 879 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 518 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,010 ft.

The land around Dublin is covered by trees (39%) and artificial surfaces (37%) within 2 miles, trees (35%), grassland (22%) and cropland (20%) within 10 miles, and cropland (56%) and trees (26%) within 50 miles.

2 miles
236 ft
10 miles
518 ft
50 miles
1,010 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hilliard 5.0 mi · Upper Arlington 7.5 mi · Westerville 9.9 mi · Columbus 11 mi · Gahanna 14 mi · Delaware 14 mi · Grove City 15 mi · Whitehall 15 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 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 Dublin (40.0992°, -83.1141°, elevation 830 ft), 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).