Isle of Lewis weather in July

In July, Isle of Lewis sees average daytime highs of 17°C and overnight lows near 11°C, with 88 mm of rain across 18.6 wet days and about 17.2 hours of daylight. It is the 2nd-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 17°C through the month. The sky is clear or mostly clear about 4% of the time in July, and the air most often feels dry.

Daylight stretches from about 17 h 48 min at the start of July to 16 h 24 min by month's end. Set against the rest of the year, July is Isle of Lewis's 12th-clearest and 12th-windiest month. For the whole year in context, see Isle of Lewis's year-round climate.

Daytime high
17°
2nd warmest
Overnight low
11°
12th coldest
Rainfall
88 mm
18.6 wet days
Daylight
17 h 18 min
3:53 AM – 9:10 PM
Cloud cover
84%
12th clearest
Wind
16 km/h
12th windiest
Solar energy
4.75 kWh/m²
Travel score
4.1
out of 10

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 17°C through the month.

A typical July day in Isle of Lewis reaches about 17°C in the afternoon and slips back to 11°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 20°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)
11611
21611
31611
41611
51611
61611
71611
81611
91611
101611
111611
121711
131711
141711
151711
161712
171712
181712
191712
201712
211712
221712
231712
241712
251712
261712
271712
281712
291712
301712
311712

How July really feels in Isle of Lewis

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.

Isle of Lewis weather by month

How July compares with the rest of the year at a glance. July is the 2nd-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 10016.21.16.91.0
Feb / 8014.828.91.1
Mar / 8416.81.311.41.4
Apr11° / 7416.10.4142.2
May13° / 7616.8016.43.0
Jun15° / 10°7916.6017.83.6
Jul17° / 11°8818.6017.24.1
Aug17° / 11°9417.9015.14.2
Sep15° / 10°8915.8012.53.7
Oct12° / 10317.609.92.7
Nov10° / 9116.30.27.51.7
Dec / 9015.716.21.1

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% of the time in July, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 7% of July, with mostly cloudy or overcast conditions the remaining 88%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11288
21288
31288
41288
51288
61288
71189
81189
91090
101090
111090
121090
131090
141090
151090
161090
171090
181090
191288
201288
211288
221288
231387
241387
251387
261288
271288
281387
291387
301387
311387

Chance of precipitation in July

Any precipitation

Isle of Lewis gets around 88 mm of rain over 18.6 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 60% and peaks near 64% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
157
257
357
457
557
658
758
858
958
1058
1158
1258
1358
1458
1558
1659
1759
1859
1960
2060
2161
2261
2362
2462
2563
2663
2763
2864
2964
3064
3163

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 80% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
188111
287121
387121
487121
586131
686131
786131
886131
986131
1086131
1186131
1285141
1383152
1483152
1582162
1681172
1780182
1879192
1978193
2077203
2176213
2275223
2374233
2474233
2573243
2672244
2771254
2872244
2973243
3073243
3174233

Wind in July

Winds average 16 km/h in July, the calmest month.

Across July, daily wind ranges from about 16 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
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze
3116light breeze

Sunrise & sunset in July

DaylightNight

Daylight runs from about 17 h 48 min at the start of July to 16 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over July. Sunrise moves from 3:34 AM to 4:21 AM, and sunset from 9:24 PM to 8:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
117.83:349:24
217.83:359:23
317.83:369:23
417.83:379:22
517.73:389:22
617.73:399:21
717.73:409:20
817.63:419:19
917.63:429:18
1017.63:449:17
1117.53:459:16
1217.53:479:15
1317.43:489:14
1417.43:509:12
1517.33:519:11
1617.33:539:10
1717.23:549:08
1817.23:569:07
1917.13:589:05
2017.14:009:03
2117.04:019:02
2216.94:039:00
2316.94:058:58
2416.84:078:56
2516.84:098:54
2616.74:118:52
2716.64:138:51
2816.64:158:49
2916.54:178:46
3016.44:198:44
3116.44:218:42

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 4.75 kWh/m².

For context, solar energy here swings from a low near 0.27 kWh/m² to a high of 5.2 kWh/m² in June across the year — July's 4.75 kWh/m² sits near the top of that range.

024151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
44.9Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.9Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.7Bright
184.7Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.6Bright
244.6Bright
254.6Bright
264.6Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
314.4Bright
Planning a trip in July

Is July a good time to visit Isle of Lewis?

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

4.1
Sightseeing
2nd-best month of the year
Beach & pool
never really warm enough

July is a reasonable time to visit Isle of Lewis for sightseeing.

What to pack for Isle of Lewis in July

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

In July, Isle of Lewis sees daytime highs around 17°C and nights near 11°C. Pack rain gear. Worth having: a warm layer and sun protection. About 19 days see rain.

rain geara warm layersun protection

Sea temperature near Isle of Lewis in July

The nearest coast averages about 13°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 13°C and coldest in March near 8°C.

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

6°8°10°12°14°JanFebMarAprMayJunJulAugSepOctNovDecbracing
Sea temperature (°C)Comfort
Jan9Bracing
Feb8Bracing
Mar8Bracing
Apr8Bracing
May9Bracing
Jun11Bracing
Jul13Bracing
Aug13Bracing
Sep13Bracing
Oct12Bracing
Nov11Bracing
Dec10Bracing

UV index in Isle of Lewis 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 Isle of Lewis peaks around July 12 at about 5 (high) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateModerateLowJul 12UV 5Dec 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5Moderate
Jul5High
Aug4Moderate
Sep2Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Isle of Lewis?

Isle of Lewis sits at 58.2°N, 6.4°W, 14 m above sea level, in United Kingdom. The nearest listed city is Inverness, 152 km away.

InvernessFort WilliamElginPerthGreenockVale of LevenDumbartonStirling

Topography around Isle of Lewis

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

Within 3 km, the terrain around Isle of Lewis has only modest variations in elevation — a maximum elevation change of 101 m around an average of 30 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 287 m; within 80 km, large variations in elevation — a maximum elevation change of 1,019 m.

The land around Isle of Lewis is covered by grassland (68%) within 3 km, grassland (60%) and water (37%) within 16 km, and water (77%) and grassland (22%) within 80 km.

3 km
101 m
16 km
287 m
80 km
1,019 m
treesgrasslandartificial surfacesbare terrainwaterwetland
July weather nearby: Inverness 152 km · Fort William 174 km · Elgin 192 km · Perth 270 km · Greenock 271 km · Vale of Leven 273 km · Dumbarton 276 km · Stirling 276 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 Isle of Lewis (58.219°, -6.388°, elevation 14 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).