Ennis weather in September

In September, Ennis sees average daytime highs of 17°C and overnight lows near 10°C, with 77 mm of rain across 12.8 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 17°C in the first days to 15°C by the end. The sky is clear or mostly clear about 6% 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 Ennis's 9th-clearest and 9th-windiest month. For the whole year in context, see Ennis's year-round climate.

Daytime high
17°
4th warmest
Overnight low
10°
9th coldest
Rainfall
77 mm
12.8 wet days
Daylight
12 h 24 min
6:18 AM – 6:43 PM
Cloud cover
79%
9th clearest
Wind
14 km/h
9th windiest
Solar energy
2.65 kWh/m²
Travel score
4.6
out of 10

Ennis is town in County Clare, Ireland.

Air quality
Moderate
PM2.5 11.8 µg/m³ · 2010

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 17°C in the first days to 15°C by the end.

A typical September day in Ennis reaches about 17°C in the afternoon and slips back to 10°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)
11811
21811
31811
41711
51711
61711
71711
81711
91711
101711
111711
121711
131710
141710
151710
161710
171610
181610
191610
201610
211610
221610
231610
241610
251610
26169
27159
28159
29159
30159

How September really feels in Ennis

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.

Ennis weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 9716.10.47.91.2
Feb / 8313.20.59.51.4
Mar10° / 7813.30.411.52.1
Apr13° / 7413.4013.63.0
May15° / 7513.6015.54.0
Jun17° / 10°7412.4016.54.9
Jul18° / 12°7913.7016.15.1
Aug18° / 12°9114.3014.55.1
Sep17° / 10°7712.8012.44.6
Oct14° / 9314.5010.33.3
Nov11° / 10115.60.18.42.0
Dec / 10615.90.37.41.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 81%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11981
21981
31981
41882
51882
61882
71783
81783
91783
101783
111981
121981
131981
141981
151981
161981
171981
181981
191981
202080
212080
221981
231981
242080
251981
261981
271981
282080
292080
302080

Chance of precipitation in September

Any precipitation

Ennis gets around 77 mm of rain over 12.8 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 42% and peaks near 44% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
141
241
341
441
541
642
742
842
942
1042
1142
1242
1342
1442
1541
1641
1741
1841
1941
2041
2141
2242
2342
2443
2543
2644
2744
2844
2944
3044

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 81% 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
573243
674233
774233
875223
976213
1078202
1178202
1279192
1380182
1482171
1582171
1683161
1783161
1884151
1985150
2085150
2186140
2286140
2386140
2486140
2587130
2687130
2788120
2888120
2989110
3089110

Wind in September

Winds average 14 km/h in September.

Across September, 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.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light 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 5:52 AM to 6:43 AM, and sunset from 7:19 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:527:19
213.45:547:17
313.35:557:15
413.35:577:12
513.25:597:10
613.16:017:07
713.06:027:05
813.06:047:02
912.96:067:00
1012.86:086:57
1112.86:096:55
1212.76:116:52
1312.66:136:50
1412.56:156:48
1512.56:166:45
1612.46:186:43
1712.36:206:40
1812.36:226:38
1912.26:236:35
2012.16:256:33
2112.16:276:30
2212.06:296:28
2311.96:306:25
2411.86:326:23
2511.86:346:20
2611.76:366:18
2711.66:376:15
2811.66:396:13
2911.56:416:10
3011.46:436:08

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.65 kWh/m².

For context, solar energy here swings from a low near 0.53 kWh/m² to a high of 4.81 kWh/m² in June across the year — September's 2.65 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.2Moderate
23.1Moderate
33.1Moderate
43.1Moderate
53.0Moderate
63.0Moderate
73.0Moderate
82.9Moderate
92.9Moderate
102.9Moderate
112.8Moderate
122.8Moderate
132.8Moderate
142.7Moderate
152.7Moderate
162.7Moderate
172.6Moderate
182.6Moderate
192.5Moderate
202.5Moderate
212.5Moderate
222.4Moderate
232.4Moderate
242.3Moderate
252.3Moderate
262.3Moderate
272.2Moderate
282.2Moderate
292.1Moderate
302.1Moderate
Planning a trip in September

Is September a good time to visit Ennis?

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

4.6
Sightseeing
4th-best month of the year
0.9
Beach & pool
4th-best month of the year

September is a reasonable time to visit Ennis for sightseeing.

What to pack for Ennis in September

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

In September, Ennis sees daytime highs around 17°C and nights near 10°C. Worth packing: a warm layer and rain gear. About 13 days see rain.

a warm layerrain gear

Sea temperature near Ennis 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 at the nearest coast (about 41 km away) is warmest in August at about 16°C and coldest in February near 9°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
Feb9Bracing
Mar9Bracing
Apr10Bracing
May12Bracing
Jun14Bracing
Jul16Cool
Aug16Cool
Sep15Cool
Oct14Bracing
Nov12Bracing
Dec10Bracing

UV index in Ennis 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 Ennis peaks around August 12 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 12UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May5Moderate
Jun6High
Jul5High
Aug6High
Sep4Moderate
Oct2Low
Nov1Low
Dec1Low

Air quality in Ennis 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 Ennis is worst in April — around 15 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (July, 9 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Ennis's WHO annual average of 11.8 µg/m³.

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 915 µg/m³Oct 229 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb14Moderate
Mar15Moderate
Apr15Moderate
May13Moderate
Jun11Good
Jul9Good
Aug11Good
Sep11Good
Oct9Good
Nov10Good
Dec11Good
Location & terrain

Where is Ennis?

Ennis sits at 52.8°N, 9.0°W, 3 m above sea level, in Ireland. The nearest listed city is Limerick, 32 km away.

LimerickGalwayTraleeKillarneyAthloneCluain MealaBallincolligCork

Topography around Ennis

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

Within 3 km, the terrain around Ennis has only modest variations in elevation — a maximum elevation change of 74 m around an average of 14 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 268 m; within 80 km, large variations in elevation — a maximum elevation change of 937 m.

The land around Ennis is covered by grassland (53%) and trees (29%) within 3 km, grassland (70%) and trees (22%) within 16 km, and grassland (65%) and water (22%) within 80 km.

3 km
74 m
16 km
268 m
80 km
937 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Limerick 32 km · Galway 48 km · Tralee 80 km · Killarney 94 km · Athlone 95 km · Cluain Meala 102 km · Ballincollig 110 km · Cork 111 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 Ennis (52.8436°, -8.9864°, elevation 3 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. 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).