Greenock weather in September

In September, Greenock sees average daytime highs of 15°C and overnight lows near 9°C, with 130 mm of rain across 15.7 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 18 min by month's end. Set against the rest of the year, September is Greenock's 5th-clearest and 9th-windiest month. For the whole year in context, see Greenock's year-round climate.

Daytime high: 15°; 4th warmest
Overnight low: 9°; 9th coldest
Rainfall: 130 mm; 15.7 wet days
Daylight: 12 h 30 min; 6:00 AM – 6:27 PM
Cloud cover: 78%; 5th clearest
Wind: 12 km/h; 9th windiest
Solar energy: 2.39 kWh/m²
Travel score: 3.8; out of 10

Greenock is town and administrative centre of Inverclyde, Scotland, UK.

Air quality: Good; PM2.5 6.6 µg/m³ · 2019

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

← August Greenock year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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 Greenock reaches about 15°C in the afternoon and slips back to 9°C overnight — a 6°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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	16	16	16	16	16	16	16	16	16	16	16	16	15	15	15	15	15	15	15	15	15	15	14	14	14	14	14	14	14	14
Avg low (°C)	10	10	10	10	10	10	10	10	10	9	9	9	9	9	9	9	9	9	9	9	9	8	8	8	8	8	8	8	8	8

	Avg high (°C)	Avg low (°C)
1	16	10
2	16	10
3	16	10
4	16	10
5	16	10
6	16	10
7	16	10
8	16	10
9	16	10
10	16	9
11	16	9
12	16	9
13	15	9
14	15	9
15	15	9
16	15	9
17	15	9
18	15	9
19	15	9
20	15	9
21	15	9
22	15	8
23	14	8
24	14	8
25	14	8
26	14	8
27	14	8
28	14	8
29	14	8
30	14	8

How September really feels in Greenock

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

heat index over the day's high

Days feeling ≤ 0°C

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.

Greenock 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.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	6° / 2°	177	18.6	5.3	7.4	0.4
Feb	7° / 2°	144	16.4	4.6	9.2	0.6
Mar	8° / 3°	131	16.3	3.3	11.4	1.2
Apr	11° / 4°	104	15.6	0.9	13.8	2.2
May	14° / 7°	110	15.7	0.1	16	3.4
Jun	16° / 9°	112	16.2	0	17.2	4.0
Jul	17° / 11°	125	17.3	0	16.7	4.5
Aug	17° / 11°	143	18.2	0	14.8	4.4
Sep	15° / 9°	130	15.7	0	12.5	3.8
Oct	12° / 6°	174	17.4	0.1	10.1	2.5
Nov	9° / 4°	160	17.8	0.7	8	1.3
Dec	6° / 2°	171	17.2	3.4	6.8	0.5

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 12% of September, with mostly cloudy or overcast conditions the remaining 80%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	21	20	20	19	19	19	20	20	20	20	19	19	20	20	20	21	21	21	21	21	21	20	20	19	19	19	19	18	18	18
Cloudier (%)	79	80	80	81	81	81	80	80	80	80	81	81	80	80	80	79	79	79	79	79	79	80	80	81	81	81	81	82	82	82

	Clearer (%)	Cloudier (%)
1	21	79
2	20	80
3	20	80
4	19	81
5	19	81
6	19	81
7	20	80
8	20	80
9	20	80
10	20	80
11	19	81
12	19	81
13	20	80
14	20	80
15	20	80
16	21	79
17	21	79
18	21	79
19	21	79
20	21	79
21	21	79
22	20	80
23	20	80
24	19	81
25	19	81
26	19	81
27	19	81
28	18	82
29	18	82
30	18	82

Chance of precipitation in September

Any precipitation

Greenock gets around 130 mm of rain over 15.7 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 52% and peaks near 58% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	52	52	52	52	52	52	52	52	52	52	52	51	51	51	51	50	50	50	50	50	51	51	52	53	54	55	56	57	57	58

	Rain chance (%)
1	52
2	52
3	52
4	52
5	52
6	52
7	52
8	52
9	52
10	52
11	52
12	51
13	51
14	51
15	51
16	50
17	50
18	50
19	50
20	50
21	51
22	51
23	52
24	53
25	54
26	55
27	56
28	57
29	57
30	58

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 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	84	85	85	85	85	86	86	86	87	88	88	89	90	90	90	91	91	91	91	92	92	92	92	92	93	93	93	94	94	95
Comfortable (%)	16	15	15	15	15	14	14	14	13	12	12	11	10	10	10	9	9	9	9	8	8	8	8	8	7	7	7	6	6	5

	Dry (%)	Comfortable (%)
1	84	16
2	85	15
3	85	15
4	85	15
5	85	15
6	86	14
7	86	14
8	86	14
9	87	13
10	88	12
11	88	12
12	89	11
13	90	10
14	90	10
15	90	10
16	91	9
17	91	9
18	91	9
19	91	9
20	92	8
21	92	8
22	92	8
23	92	8
24	92	8
25	93	7
26	93	7
27	93	7
28	94	6
29	94	6
30	95	5

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	12	12	12	12	12	12	12	12	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13
Feels	calm	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

	Wind speed (km/h)	Feels
1	12	calm
2	12	light breeze
3	12	light breeze
4	12	light breeze
5	12	light breeze
6	12	light breeze
7	12	light breeze
8	12	light breeze
9	13	light breeze
10	13	light breeze
11	13	light breeze
12	13	light breeze
13	13	light breeze
14	13	light breeze
15	13	light breeze
16	13	light breeze
17	13	light breeze
18	13	light breeze
19	13	light breeze
20	13	light breeze
21	13	light breeze
22	13	light breeze
23	13	light breeze
24	13	light breeze
25	13	light breeze
26	13	light breeze
27	13	light breeze
28	13	light breeze
29	13	light breeze
30	13	light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 36 min at the start of September to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 138 minutes over September. Sunrise moves from 5:30 AM to 6:28 AM, and sunset from 7:08 PM to 5:49 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	13.6	13.6	13.5	13.4	13.3	13.2	13.2	13.1	13.0	12.9	12.9	12.8	12.7	12.6	12.5	12.5	12.4	12.3	12.2	12.1	12.1	12.0	11.9	11.8	11.7	11.7	11.6	11.5	11.4	11.3
Sunrise (AM)	5:30	5:32	5:34	5:36	5:38	5:40	5:42	5:44	5:46	5:48	5:50	5:52	5:54	5:56	5:58	6:00	6:02	6:04	6:06	6:08	6:10	6:12	6:14	6:16	6:18	6:20	6:22	6:24	6:26	6:28
Sunset (PM)	7:08	7:05	7:03	7:00	6:57	6:55	6:52	6:49	6:46	6:44	6:41	6:38	6:35	6:33	6:30	6:27	6:24	6:22	6:19	6:16	6:13	6:11	6:08	6:05	6:02	6:00	5:57	5:54	5:51	5:49

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.6	5:30	7:08
2	13.6	5:32	7:05
3	13.5	5:34	7:03
4	13.4	5:36	7:00
5	13.3	5:38	6:57
6	13.2	5:40	6:55
7	13.2	5:42	6:52
8	13.1	5:44	6:49
9	13.0	5:46	6:46
10	12.9	5:48	6:44
11	12.9	5:50	6:41
12	12.8	5:52	6:38
13	12.7	5:54	6:35
14	12.6	5:56	6:33
15	12.5	5:58	6:30
16	12.5	6:00	6:27
17	12.4	6:02	6:24
18	12.3	6:04	6:22
19	12.2	6:06	6:19
20	12.1	6:08	6:16
21	12.1	6:10	6:13
22	12.0	6:12	6:11
23	11.9	6:14	6:08
24	11.8	6:16	6:05
25	11.7	6:18	6:02
26	11.7	6:20	6:00
27	11.6	6:22	5:57
28	11.5	6:24	5:54
29	11.4	6:26	5:51
30	11.3	6:28	5:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.39 kWh/m².

For context, solar energy here swings from a low near 0.35 kWh/m² to a high of 4.7 kWh/m² in May across the year — September's 2.39 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	3.0	2.9	2.9	2.8	2.8	2.8	2.7	2.7	2.6	2.6	2.6	2.5	2.5	2.5	2.4	2.4	2.4	2.3	2.3	2.3	2.2	2.2	2.1	2.1	2.0	2.0	2.0	1.9	1.9	1.9
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Dim	Dim	Dim	Dim

	Solar energy (kWh/m²)	Level
1	3.0	Moderate
2	2.9	Moderate
3	2.9	Moderate
4	2.8	Moderate
5	2.8	Moderate
6	2.8	Moderate
7	2.7	Moderate
8	2.7	Moderate
9	2.6	Moderate
10	2.6	Moderate
11	2.6	Moderate
12	2.5	Moderate
13	2.5	Moderate
14	2.5	Moderate
15	2.4	Moderate
16	2.4	Moderate
17	2.4	Moderate
18	2.3	Moderate
19	2.3	Moderate
20	2.3	Moderate
21	2.2	Moderate
22	2.2	Moderate
23	2.1	Moderate
24	2.1	Moderate
25	2.0	Moderate
26	2.0	Moderate
27	2.0	Dim
28	1.9	Dim
29	1.9	Dim
30	1.9	Dim

Planning a trip in September

Is September a good time to visit Greenock?

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

3.8

Sightseeing

4th-best month of the year

—

Beach & pool

never really warm enough

September is a weaker month for outdoor sightseeing in Greenock.

What to pack for Greenock in September

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

In September, Greenock sees daytime highs around 15°C and nights near 9°C. Pack rain gear. Worth having: a warm layer. About 16 days see rain.

rain geara warm layer

Sea temperature near Greenock 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 August at about 15°C and coldest in February near 7°C.

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	8	7	7	8	10	13	15	15	14	12	11	9
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Cool	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°C)	Comfort
Jan	8	Bracing
Feb	7	Bracing
Mar	7	Bracing
Apr	8	Bracing
May	10	Bracing
Jun	13	Bracing
Jul	15	Bracing
Aug	15	Cool
Sep	14	Bracing
Oct	12	Bracing
Nov	11	Bracing
Dec	9	Bracing

UV index in Greenock 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 Greenock peaks around June 20 at about 5 (high) — a little sun protection helps at midday. It bottoms out near December 20 at about 0 (low).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	0	1	2	3	5	5	5	4	3	2	1	0
Level	Low	Low	Moderate	Moderate	Moderate	High	Moderate	Moderate	Moderate	Low	Low	Low

	UV index (midday)	Level
Jan	0	Low
Feb	1	Low
Mar	2	Moderate
Apr	3	Moderate
May	5	Moderate
Jun	5	High
Jul	5	Moderate
Aug	4	Moderate
Sep	3	Moderate
Oct	2	Low
Nov	1	Low
Dec	0	Low

Location & terrain

Where is Greenock?

Greenock sits at 55.9°N, 4.8°W, 12 m above sea level, in United Kingdom. The nearest listed city is Vale of Leven, 12 km away.

Topography around Greenock

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

Within 3 km, the terrain around Greenock has significant variations in elevation — a maximum elevation change of 279 m around an average of 65 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 706 m; within 80 km, large variations in elevation — a maximum elevation change of 1,195 m.

The land around Greenock is covered by water (41%) and grassland (27%) within 3 km, grassland (50%), water (24%) and trees (22%) within 16 km, and grassland (53%) and water (24%) within 80 km.

3 km

279 m

water 41%

16 km

706 m

grassland 50%

80 km

1,195 m

grassland 53%

treesgrasslandcroplandartificial surfaceswater

← August Greenock year-round climate October →Best places to visit in September

September weather nearby: Vale of Leven 12 km · Dumbarton 12 km · Erskine 20 km · Johnstone 20 km · Clydebank 23 km · Paisley 24 km · Renfrew 24 km · Bearsden 27 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

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 Greenock (55.9484°, -4.7612°, elevation 12 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).

	Avg high (°C)	Avg low (°C)
1	16	10
2	16	10
3	16	10
4	16	10
5	16	10
6	16	10
7	16	10
8	16	10
9	16	10
10	16	9
11	16	9
12	16	9
13	15	9
14	15	9
15	15	9
16	15	9
17	15	9
18	15	9
19	15	9
20	15	9
21	15	9
22	15	8
23	14	8
24	14	8
25	14	8
26	14	8
27	14	8
28	14	8
29	14	8
30	14	8

	Clearer (%)	Cloudier (%)
1	21	79
2	20	80
3	20	80
4	19	81
5	19	81
6	19	81
7	20	80
8	20	80
9	20	80
10	20	80
11	19	81
12	19	81
13	20	80
14	20	80
15	20	80
16	21	79
17	21	79
18	21	79
19	21	79
20	21	79
21	21	79
22	20	80
23	20	80
24	19	81
25	19	81
26	19	81
27	19	81
28	18	82
29	18	82
30	18	82

	Rain chance (%)
1	52
2	52
3	52
4	52
5	52
6	52
7	52
8	52
9	52
10	52
11	52
12	51
13	51
14	51
15	51
16	50
17	50
18	50
19	50
20	50
21	51
22	51
23	52
24	53
25	54
26	55
27	56
28	57
29	57
30	58

	Dry (%)	Comfortable (%)
1	84	16
2	85	15
3	85	15
4	85	15
5	85	15
6	86	14
7	86	14
8	86	14
9	87	13
10	88	12
11	88	12
12	89	11
13	90	10
14	90	10
15	90	10
16	91	9
17	91	9
18	91	9
19	91	9
20	92	8
21	92	8
22	92	8
23	92	8
24	92	8
25	93	7
26	93	7
27	93	7
28	94	6
29	94	6
30	95	5

	Avg high (°C)	Avg low (°C)
1	16	10
2	16	10
3	16	10
4	16	10
5	16	10
6	16	10
7	16	10
8	16	10
9	16	10
10	16	9
11	16	9
12	16	9
13	15	9
14	15	9
15	15	9
16	15	9
17	15	9
18	15	9
19	15	9
20	15	9
21	15	9
22	15	8
23	14	8
24	14	8
25	14	8
26	14	8
27	14	8
28	14	8
29	14	8
30	14	8

	Clearer (%)	Cloudier (%)
1	21	79
2	20	80
3	20	80
4	19	81
5	19	81
6	19	81
7	20	80
8	20	80
9	20	80
10	20	80
11	19	81
12	19	81
13	20	80
14	20	80
15	20	80
16	21	79
17	21	79
18	21	79
19	21	79
20	21	79
21	21	79
22	20	80
23	20	80
24	19	81
25	19	81
26	19	81
27	19	81
28	18	82
29	18	82
30	18	82

	Rain chance (%)
1	52
2	52
3	52
4	52
5	52
6	52
7	52
8	52
9	52
10	52
11	52
12	51
13	51
14	51
15	51
16	50
17	50
18	50
19	50
20	50
21	51
22	51
23	52
24	53
25	54
26	55
27	56
28	57
29	57
30	58

	Dry (%)	Comfortable (%)
1	84	16
2	85	15
3	85	15
4	85	15
5	85	15
6	86	14
7	86	14
8	86	14
9	87	13
10	88	12
11	88	12
12	89	11
13	90	10
14	90	10
15	90	10
16	91	9
17	91	9
18	91	9
19	91	9
20	92	8
21	92	8
22	92	8
23	92	8
24	92	8
25	93	7
26	93	7
27	93	7
28	94	6
29	94	6
30	95	5

	Avg high (°C)	Avg low (°C)
1	16	10
2	16	10
3	16	10
4	16	10
5	16	10
6	16	10
7	16	10
8	16	10
9	16	10
10	16	9
11	16	9
12	16	9
13	15	9
14	15	9
15	15	9
16	15	9
17	15	9
18	15	9
19	15	9
20	15	9
21	15	9
22	15	8
23	14	8
24	14	8
25	14	8
26	14	8
27	14	8
28	14	8
29	14	8
30	14	8

	Clearer (%)	Cloudier (%)
1	21	79
2	20	80
3	20	80
4	19	81
5	19	81
6	19	81
7	20	80
8	20	80
9	20	80
10	20	80
11	19	81
12	19	81
13	20	80
14	20	80
15	20	80
16	21	79
17	21	79
18	21	79
19	21	79
20	21	79
21	21	79
22	20	80
23	20	80
24	19	81
25	19	81
26	19	81
27	19	81
28	18	82
29	18	82
30	18	82

	Rain chance (%)
1	52
2	52
3	52
4	52
5	52
6	52
7	52
8	52
9	52
10	52
11	52
12	51
13	51
14	51
15	51
16	50
17	50
18	50
19	50
20	50
21	51
22	51
23	52
24	53
25	54
26	55
27	56
28	57
29	57
30	58

	Dry (%)	Comfortable (%)
1	84	16
2	85	15
3	85	15
4	85	15
5	85	15
6	86	14
7	86	14
8	86	14
9	87	13
10	88	12
11	88	12
12	89	11
13	90	10
14	90	10
15	90	10
16	91	9
17	91	9
18	91	9
19	91	9
20	92	8
21	92	8
22	92	8
23	92	8
24	92	8
25	93	7
26	93	7
27	93	7
28	94	6
29	94	6
30	95	5