Isle of Lewis weather in August

In August, Isle of Lewis sees average daytime highs of 17°C and overnight lows near 11°C, with 94 mm of rain across 17.9 wet days and about 15.1 hours of daylight. It is the 1st-warmest and 3rd-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 5% of the time in August, and the air most often feels dry.

Daylight stretches from about 16 h 18 min at the start of August to 13 h 54 min by month's end. Set against the rest of the year, August is Isle of Lewis's 10th-clearest and 11th-windiest month. For the whole year in context, see Isle of Lewis's year-round climate.

Daytime high
17°
1st warmest
Overnight low
11°
12th coldest
Rainfall
94 mm
17.9 wet days
Daylight
15 h 06 min
4:56 AM – 8:04 PM
Cloud cover
81%
10th clearest
Wind
17 km/h
11th windiest
Solar energy
3.93 kWh/m²
Travel score
4.2
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

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

A typical August 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, August runs on par with July and about 2°C warmer than September.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
11712
21712
31712
41712
51712
61712
71712
81712
91712
101712
111712
121712
131712
141712
151712
161712
171711
181711
191711
201711
211711
221711
231711
241711
251611
261611
271611
281611
291611
301611
311611

How August really feels in Isle of Lewis

Once humidity and wind are folded in, August 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

August 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 August compares with the rest of the year at a glance. August is the 1st-warmest and 3rd-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 August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 5% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 10% of August, with mostly cloudy or overcast conditions the remaining 85%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11288
21288
31288
41288
51288
61288
71288
81189
91288
101288
111288
121288
131288
141387
151486
161486
171585
181585
191684
201783
211684
221783
231783
241981
251981
261882
271882
281882
291882
301783
311783

Chance of precipitation in August

Any precipitation

Isle of Lewis gets around 94 mm of rain over 17.9 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 58% and peaks near 63% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
163
263
362
461
561
660
760
859
959
1058
1158
1258
1358
1458
1558
1658
1758
1858
1958
2058
2158
2258
2357
2457
2557
2656
2756
2856
2955
3055
3155

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the dry band about 82% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
175223
275223
376213
477203
578193
678193
779183
879183
979183
1080182
1181172
1281172
1381172
1481172
1581172
1682171
1782171
1882171
1983161
2083161
2185150
2285150
2386140
2487130
2587130
2688120
2788120
2888120
2989110
3089110
3189110

Wind in August

Winds average 17 km/h in August.

Across August, daily wind ranges from about 16 km/h on the calmest days to 18 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
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3018light breeze
3118light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 16 h 18 min at the start of August to 13 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 144 minutes over August. Sunrise moves from 4:23 AM to 5:29 AM, and sunset from 8:40 PM to 7:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
116.34:238:40
216.24:258:38
316.14:278:36
416.14:308:33
516.04:328:31
615.94:348:29
715.84:368:26
815.84:388:24
915.74:408:21
1015.64:438:19
1115.54:458:16
1215.44:478:14
1315.44:498:11
1415.34:518:09
1515.24:548:06
1615.14:568:04
1715.04:588:01
1815.05:007:58
1914.95:027:56
2014.85:057:53
2114.75:077:50
2214.65:097:47
2314.65:117:45
2414.55:147:42
2514.45:167:39
2614.35:187:36
2714.25:207:33
2814.15:237:31
2914.05:257:28
3014.05:277:25
3113.95:297:22

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 3.93 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 — August's 3.93 kWh/m² falls in the middle.

012345151015202531
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.3Bright
54.3Bright
64.3Bright
74.2Bright
84.2Bright
94.2Bright
104.1Bright
114.1Bright
124.1Bright
134.0Bright
144.0Moderate
154.0Moderate
163.9Moderate
173.9Moderate
183.9Moderate
193.8Moderate
203.8Moderate
213.7Moderate
223.7Moderate
233.7Moderate
243.6Moderate
253.6Moderate
263.5Moderate
273.5Moderate
283.4Moderate
293.4Moderate
303.3Moderate
313.2Moderate
Planning a trip in August

Is August a good time to visit Isle of Lewis?

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

4.2
Sightseeing
1st-best month of the year
Beach & pool
never really warm enough

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

What to pack for Isle of Lewis in August

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

In August, Isle of Lewis sees daytime highs around 17°C and nights near 11°C. Pack rain gear. Worth having: a warm layer. About 18 days see rain.

rain geara warm layer

Sea temperature near Isle of Lewis in August

The nearest coast averages about 13°C in August — 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 August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 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
August 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).