Dumbarton weather in January

In January, Dumbarton sees average daytime highs of 6°C and overnight lows near 2°C, with 148 mm of precipitation across 17.9 wet days and about 7.4 hours of daylight. It is the 12th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 6°C through the month. The sky is clear or mostly clear about 8% of the time in January, and the air most often feels dry.

Daylight stretches from about 6 h 48 min at the start of January to 8 h 06 min by month's end. Set against the rest of the year, January is Dumbarton's 12th-clearest and 1st-windiest month. For the whole year in context, see Dumbarton's year-round climate.

Daytime high
12th warmest
Overnight low
3rd coldest
Precipitation
148 mm
17.9 wet days
Daylight
7 h 18 min
8:48 AM – 4:07 PM
Cloud cover
80%
12th clearest
Wind
15 km/h
1st windiest
Solar energy
0.47 kWh/m²
Travel score
0.4
out of 10

Dumbarton is town and burgh in West Dunbartonshire, Scotland, UK.

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

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 6°C through the month.

A typical January day in Dumbarton reaches about 6°C in the afternoon and slips back to 2°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 2°C and 10°C. Set against its neighbours, January runs on par with December and on par with February.

-5°10°15°151015202531
Avg high (°C)Avg low (°C)
162
262
362
462
562
662
762
862
962
1062
1162
1262
1362
1462
1562
1662
1762
1862
1962
2062
2162
2262
2362
2462
2562
2662
2762
2862
2962
3062
3162

How January really feels in Dumbarton

Once humidity and wind are folded in, January averages 0 days that feel above 32°C and 31 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
31
wind chill below the day's low

The story in January is cold — wind chill drags the overnight "feels like" below the raw low.

Dumbarton weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 14817.94.47.40.4
Feb / 11815.43.79.20.6
Mar / 10615.52.511.41.3
Apr11° / 8514.40.813.82.3
May14° / 8614.60.1163.5
Jun16° / 9114.7017.24.2
Jul18° / 11°10116016.74.7
Aug17° / 11°11316.9014.84.6
Sep15° / 10114.3012.54.0
Oct12° / 14216.3010.12.6
Nov / 132170.681.3
Dec / 14216.62.86.80.5

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 11% of January, with mostly cloudy or overcast conditions the remaining 81%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11783
21981
31981
41981
51981
62080
71981
82080
92080
102080
112179
122080
131981
141981
151882
161882
171882
181882
191783
201882
211882
221882
231882
241882
251882
261882
271981
282080
292080
302179
312179

Chance of precipitation in January

Any precipitationSnow

Dumbarton gets around 148 mm of rain and snow over 17.9 wet days in January, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 58% and peaks near 62% on the wettest days, and about 4 days bring snow.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
15814
25814
35914
45914
56015
66115
76115
86216
96216
106216
116216
126216
136116
146116
156016
166015
175915
185815
195814
205714
215613
225513
235513
245413
255412
265412
275412
285413
295413
305413
315513

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in January

Winds average 15 km/h in January, the windiest month of the year.

Across January, 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.

05101520151015202531
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1116light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze
3115light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 6 h 48 min at the start of January to 8 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 78 minutes over January. Sunrise moves from 8:58 AM to 8:27 AM, and sunset from 3:45 PM to 4:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
16.88:583:45
26.88:583:46
36.88:573:47
46.98:573:48
56.98:573:50
66.98:563:51
76.98:563:52
87.08:553:54
97.08:553:55
107.08:543:57
117.18:533:58
127.18:524:00
137.28:514:02
147.28:514:03
157.38:504:05
167.38:484:07
177.38:474:08
187.48:464:10
197.48:454:12
207.58:444:14
217.68:434:16
227.68:414:18
237.78:404:20
247.78:384:22
257.88:374:24
267.88:354:26
277.98:344:28
288.08:324:30
298.08:314:32
308.18:294:34
318.18:274:36

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 0.47 kWh/m².

For context, solar energy here swings from a low near 0.34 kWh/m² to a high of 4.66 kWh/m² in May across the year — January's 0.47 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.3Dim
20.3Dim
30.4Dim
40.4Dim
50.4Dim
60.4Dim
70.4Dim
80.4Dim
90.4Dim
100.4Dim
110.4Dim
120.4Dim
130.4Dim
140.4Dim
150.4Dim
160.5Dim
170.5Dim
180.5Dim
190.5Dim
200.5Dim
210.5Dim
220.5Dim
230.6Dim
240.6Dim
250.6Dim
260.6Dim
270.6Dim
280.7Dim
290.7Dim
300.7Dim
310.7Dim
Planning a trip in January

Is January a good time to visit Dumbarton?

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

0.4
Sightseeing
12th-best month of the year
0.0
Beach & pool
7th-best month of the year

January is a weaker month for outdoor sightseeing in Dumbarton.

What to pack for Dumbarton in January

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

In January, Dumbarton sees daytime highs around 6°C and nights near 2°C. Pack a warm layer and rain gear. Worth having: a heavy coat. About 18 days see rain.

a warm layerrain geara heavy coat

Sea temperature near Dumbarton in January

The nearest coast averages about 8°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 35 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.

5°10°15°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan8Bracing
Feb7Bracing
Mar7Bracing
Apr8Bracing
May10Bracing
Jun13Bracing
Jul15Bracing
Aug15Cool
Sep14Bracing
Oct12Bracing
Nov11Bracing
Dec9Bracing

UV index in Dumbarton in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 0. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Dumbarton peaks around June 18 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 18UV 5Dec 20UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5Moderate
Jun5High
Jul5Moderate
Aug5Moderate
Sep3Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Dumbarton?

Dumbarton sits at 55.9°N, 4.6°W, 4 m above sea level, in United Kingdom. The nearest listed city is Vale of Leven, 3.0 km away.

Topography around Dumbarton

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

Within 3 km, the terrain around Dumbarton has only modest variations in elevation — a maximum elevation change of 172 m around an average of 31 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 533 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,210 m.

The land around Dumbarton is covered by grassland (30%), water (28%) and trees (25%) within 3 km, grassland (53%) and trees (23%) within 16 km, and grassland (56%) within 80 km.

3 km
172 m
16 km
533 m
80 km
1,210 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Vale of Leven 3.0 km · Erskine 9.0 km · Clydebank 11 km · Greenock 12 km · Johnstone 13 km · Renfrew 14 km · Bearsden 15 km · Paisley 15 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 Dumbarton (55.9443°, -4.5706°, elevation 4 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).