Bar Harbor weather in August

In August, Bar Harbor sees average daytime highs of 72°F and overnight lows near 60°F, with 2.8 in of rain across 8.3 wet days and about 13.8 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 73°F in the first days to 70°F by the end. The sky is clear or mostly clear about 33% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 14 h 30 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Bar Harbor's 2nd-clearest and 12th-windiest month. For the whole year in context, see Bar Harbor's year-round climate.

Daytime high
72°
2nd warmest
Overnight low
60°
12th coldest
Rainfall
2.8 in
8.3 wet days
Daylight
13 h 54 min
4:41 AM – 6:33 PM
Cloud cover
57%
2nd clearest
Wind
7 mph
12th windiest
Solar energy
5.28 kWh/m²
Travel score
7.0
out of 10

Bar Harbor is town in Hancock County, Maine, United States.

Air quality
Excellent
PM10 5.1 µg/m³ · 2019
Founded
1763

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 73°F in the first days to 70°F by the end.

A typical August day in Bar Harbor reaches about 72°F in the afternoon and slips back to 60°F overnight — a 12°F spread between the day's warmth and the night's chill. On most days the high lands between 67°F and 78°F. Set against its neighbours, August runs on par with July and about 6°F warmer than September.

50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
17362
27361
37361
47361
57361
67361
77361
87361
97361
107361
117361
127361
137361
147361
157361
167260
177260
187260
197260
207260
217260
227260
237160
247159
257159
267159
277159
287159
297158
307058
317058

How August really feels in Bar Harbor

Once humidity and wind are folded in, August averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
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.

Bar Harbor weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan30° / 16°3.910.27.790.0
Feb31° / 17°3.39.3710.10.0
Mar38° / 25°3.910.6611.60.0
Apr48° / 37°3.811.42.413.21.6
May57° / 46°3.311014.63.9
Jun66° / 54°3.610.1015.35.9
Jul72° / 60°2.8100156.7
Aug72° / 60°2.88.3013.87.0
Sep66° / 54°3.77.9012.36.3
Oct56° / 45°4.79.90.210.83.7
Nov45° / 35°4.3101.59.41.1
Dec35° / 24°4.811.66.28.70.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 19% of August, with mostly cloudy or overcast conditions the remaining 48%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14753
24852
34951
44951
54951
64951
74951
84951
94951
105050
115050
125149
135149
145149
155149
165149
175248
185248
195347
205347
215545
225545
235545
245644
255644
265644
275644
285644
295644
305644
315644

Chance of precipitation in August

Any precipitation

Bar Harbor gets around 2.8 in of rain over 8.3 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 27% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
129
229
328
428
528
628
728
828
928
1028
1128
1228
1328
1428
1527
1627
1727
1827
1926
2026
2125
2225
2325
2425
2524
2624
2724
2824
2924
3024
3124

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the comfortable band about 36% of days. Sticky, muggy-or-worse air turns up on roughly 9% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
111324512
211324511
311334411
412344311
512354311
612364210
712374110
812374010
913383910
1013393910
1113393810
1214393810
131539379
141539379
151639369
161738369
171838369
181938359
192037358
202137348
212236348
222336337
232536327
242636317
252836307
262936296
273036286
283136276
293336266
303436255
313535245

Wind in August

Winds average 7 mph in August, the calmest month.

Across August, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227light breeze
237light breeze
248light breeze
258light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light breeze
318light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 30 min at the start of August to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over August. Sunrise moves from 4:24 AM to 4:59 AM, and sunset from 6:54 PM to 6:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.54:246:54
214.54:256:53
314.44:266:52
414.44:276:50
514.34:286:49
614.34:296:48
714.34:306:46
814.24:326:45
914.24:336:43
1014.14:346:42
1114.14:356:41
1214.04:366:39
1314.04:376:38
1414.04:396:36
1513.94:406:34
1613.94:416:33
1713.84:426:31
1813.84:436:30
1913.74:456:28
2013.74:466:26
2113.64:476:25
2213.64:486:23
2313.54:496:21
2413.54:516:19
2513.44:526:18
2613.44:536:16
2713.34:546:14
2813.34:556:12
2913.24:576:10
3013.24:586:09
3113.14:596:07

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.28 kWh/m².

For context, solar energy here swings from a low near 1.41 kWh/m² to a high of 5.84 kWh/m² in July across the year — August's 5.28 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.4Bright
95.4Bright
105.4Bright
115.4Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.1Bright
255.1Bright
265.0Bright
275.0Bright
285.0Bright
294.9Bright
304.9Bright
314.8Bright
Planning a trip in August

Hazard calendar for Bar Harbor

In seasonPeak

In August, Bar Harbor sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Bar Harbor sits in the Atlantic hurricane belt; the season peaks August–October.

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

Is August a good time to visit Bar Harbor?

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

7.0
Sightseeing
1st-best month of the year
5.0
Beach & pool
1st-best month of the year

August is one of the better times to visit Bar Harbor for general sightseeing.

What to pack for Bar Harbor in August

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

In August, Bar Harbor sees daytime highs around 72°F and nights near 60°F. Worth packing: light clothes, rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

Sea temperature near Bar Harbor in August

The nearest coast averages about 55°F 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 55°F and coldest in March near 38°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

40°50°60°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°F)Comfort
Jan42Bracing
Feb39Bracing
Mar38Bracing
Apr40Bracing
May44Bracing
Jun48Bracing
Jul53Bracing
Aug55Bracing
Sep54Bracing
Oct52Bracing
Nov49Bracing
Dec46Bracing

UV index in Bar Harbor 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 Bar Harbor peaks around July 13 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateModerateLowJul 13UV 7Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5High
May7High
Jun6High
Jul8Very high
Aug4Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Bar Harbor?

Bar Harbor sits at 44.4°N, 68.2°W, 0 ft above sea level, in United States. The nearest listed city is Bangor, 40 mi away.

Topography around Bar Harbor

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Bar Harbor.

Within 2 miles, the terrain around Bar Harbor has significant variations in elevation — a maximum elevation change of 938 ft around an average of 105 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,526 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,516 ft.

The land around Bar Harbor is covered by water (52%) and trees (41%) within 2 miles, water (48%) and trees (47%) within 10 miles, and water (49%) and trees (47%) within 50 miles.

2 miles
938 ft
10 miles
1,526 ft
50 miles
1,516 ft
treesgrasslandartificial surfaceswaterwetland
August weather nearby: Bangor 40 mi · Waterville 71 mi · Augusta 78 mi · Brunswick 93 mi · Lewiston 101 mi · Auburn 103 mi · South Portland 114 mi · Portland 114 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 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 Bar Harbor (44.3876°, -68.2039°, elevation 0 ft), 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).