Dumbarton weather in July

In July, Dumbarton sees average daytime highs of 18°C and overnight lows near 11°C, with 101 mm of rain across 16 wet days and about 16.7 hours of daylight. It is the 1st-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 18°C through the month. The sky is clear or mostly clear about 6% of the time in July, and the air most often feels dry.

Daylight stretches from about 17 h 12 min at the start of July to 16 hours by month's end. Set against the rest of the year, July is Dumbarton's 9th-clearest and 12th-windiest month. For the whole year in context, see Dumbarton's year-round climate.

Daytime high
18°
1st warmest
Overnight low
11°
12th coldest
Rainfall
101 mm
16 wet days
Daylight
16 h 48 min
4:01 AM – 8:47 PM
Cloud cover
79%
9th clearest
Wind
12 km/h
12th windiest
Solar energy
4.21 kWh/m²
Travel score
4.7
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 July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 18°C through the month.

A typical July day in Dumbarton reaches about 18°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 15°C and 21°C. Set against its neighbours, July runs about 2°C warmer than June and on par with August.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11711
21711
31711
41711
51711
61711
71711
81711
91711
101711
111711
121711
131711
141711
151811
161811
171811
181811
191811
201811
211812
221812
231812
241812
251812
261812
271812
281812
291812
301812
311812

How July really feels in Dumbarton

Once humidity and wind are folded in, July 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

July sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Dumbarton weather by month

How July compares with the rest of the year at a glance. July is the 1st-warmest and 8th-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 July

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

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

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11882
21882
31882
41882
51882
61882
71783
81882
91882
101981
111981
121981
131882
141882
151981
161981
171882
181882
191981
201981
211981
221981
231981
242080
251981
261981
271981
282080
292080
302179
312179

Chance of precipitation in July

Any precipitation

Dumbarton gets around 101 mm of rain over 16 wet days in July. 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 55% on the wettest days.

0%20%40%60%151015202531
Rain chance (%)
149
249
350
450
550
650
749
849
949
1049
1150
1250
1350
1450
1551
1651
1751
1852
1952
2052
2153
2253
2354
2454
2555
2655
2755
2855
2955
3055
3155

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the dry band about 73% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
185141
284151
382162
481172
580182
679192
779192
878202
978202
1077212
1177212
1276222
1375232
1475232
1574242
1673252
1773252
1872262
1971272
2070273
2169283
2269283
2368293
2467294
2566304
2666304
2766304
2866304
2965305
3066295
3166295

Wind in July

Winds average 12 km/h in July, the calmest month.

Across July, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 17 h 12 min at the start of July to 16 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over July. Sunrise moves from 3:44 AM to 4:26 AM, and sunset from 8:59 PM to 8:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
117.23:448:59
217.23:458:59
317.23:468:58
417.23:478:58
517.23:488:57
617.13:498:56
717.13:508:56
817.13:518:55
917.03:528:54
1017.03:538:53
1117.03:548:52
1216.93:558:51
1316.93:578:50
1416.93:588:49
1516.83:598:48
1616.84:018:47
1716.74:028:46
1816.74:048:44
1916.64:058:43
2016.64:078:42
2116.54:098:40
2216.54:108:39
2316.44:128:37
2416.44:138:35
2516.34:158:34
2616.34:178:32
2716.24:198:30
2816.14:208:28
2916.14:228:27
3016.04:248:25
3116.04:268:23

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 4.21 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 — July's 4.21 kWh/m² sits near the top of that range.

012345151015202531
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.4Bright
54.4Bright
64.4Bright
74.3Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.1Bright
224.1Bright
234.1Bright
244.1Bright
254.0Bright
264.0Bright
274.0Moderate
284.0Moderate
293.9Moderate
303.9Moderate
313.9Moderate
Planning a trip in July

Is July a good time to visit Dumbarton?

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

4.7
Sightseeing
1st-best month of the year
1.3
Beach & pool
1st-best month of the year

July is a reasonable time to visit Dumbarton for sightseeing.

What to pack for Dumbarton in July

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

In July, Dumbarton sees daytime highs around 18°C and nights near 11°C. Pack rain gear. About 16 days see rain.

rain gear

Sea temperature near Dumbarton in July

The nearest coast averages about 15°C in July — 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 July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 5 — enough to warrant sun protection. 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
July 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).