Carlisle weather in August

In August, Carlisle sees average daytime highs of 82°F and overnight lows near 65°F, with 3.4 in of rain across 10.6 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 84°F in the first days to 81°F by the end. The sky is clear or mostly clear about 29% of the time in August, and the air most often feels muggy.

Daylight stretches from about 14 h 12 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Carlisle's 3rd-clearest and 12th-windiest month. For the whole year in context, see Carlisle's year-round climate.

Daytime high
82°
2nd warmest
Overnight low
65°
11th coldest
Rainfall
3.4 in
10.6 wet days
Daylight
13 h 36 min
5:25 AM – 7:01 PM
Cloud cover
58%
3rd clearest
Wind
5 mph
12th windiest
Solar energy
5.26 kWh/m²
Travel score
6.0
out of 10

Carlisle is borough in Cumberland County, Pennsylvania, United States.

Density
1,334/km²
people per km²
Founded
1751

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 84°F in the first days to 81°F by the end.

A typical August day in Carlisle reaches about 82°F in the afternoon and slips back to 65°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 75°F and 90°F. Set against its neighbours, August runs about 2°F cooler than July and about 7°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18467
28467
38467
48467
58466
68466
78366
88366
98366
108366
118366
128366
138365
148365
158365
168265
178265
188265
198265
208265
218265
228264
238264
248264
258264
268164
278164
288164
298163
308163
318163

How August really feels in Carlisle

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.

Carlisle weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan38° / 24°3.29.24.59.50.0
Feb40° / 25°2.894.410.40.2
Mar50° / 33°3.910.73.311.72.1
Apr62° / 43°3.711.20.3135.0
May71° / 53°3.812.7014.26.1
Jun80° / 62°3.711.6014.86.2
Jul84° / 67°3.910.8014.65.3
Aug82° / 65°3.410.6013.66.0
Sep76° / 58°4.49.3012.36.9
Oct64° / 46°3.48.30.210.95.8
Nov52° / 37°3.18.50.89.82.8
Dec42° / 29°3.4939.20.3

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 29% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 21% of August, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14951
24951
34951
44951
54951
64852
74852
84951
94951
104951
114852
124951
134951
144951
155149
165149
175149
185248
195248
205248
215248
225248
235248
245347
255248
265347
275347
285248
295347
305347
315347

Chance of precipitation in August

Any precipitation

Carlisle gets around 3.4 in of rain over 10.6 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 34% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
335
435
535
636
736
836
937
1037
1138
1238
1338
1438
1538
1637
1737
1836
1936
2035
2134
2233
2332
2432
2531
2630
2730
2829
2929
3029
3129

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the muggy band about 29% of days. Sticky, muggy-or-worse air turns up on roughly 34% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1121929328
2131929327
3131928327
4141928327
5142027327
6142027327
7142026327
8142126327
9152126317
10152126317
11152126317
12152226317
13152226307
14152227306
15152327306
16152327296
17152328295
18152328295
19152429285
20152429284
21162429284
22162429274
23172428274
24182428263
25192527263
26202526253
27212525254
28222625244
29232624244
30242623244
31252622234

Wind in August

Winds average 5 mph in August, the calmest month.

Across August, daily wind ranges from about 4 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
15calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 12 min at the start of August to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over August. Sunrise moves from 5:10 AM to 5:40 AM, and sunset from 7:19 PM to 6:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.25:107:19
214.15:117:18
314.15:127:17
414.15:137:16
514.05:147:15
614.05:157:14
713.95:167:13
813.95:177:12
913.95:187:10
1013.85:197:09
1113.85:207:08
1213.85:217:06
1313.75:227:05
1413.75:237:04
1513.65:247:02
1613.65:257:01
1713.65:267:00
1813.55:276:58
1913.55:286:57
2013.45:296:55
2113.45:306:54
2213.45:316:52
2313.35:326:51
2413.35:336:49
2513.25:346:48
2613.25:356:46
2713.15:366:45
2813.15:376:43
2913.15:386:41
3013.05:396:40
3113.05:406:38

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.26 kWh/m².

For context, solar energy here swings from a low near 1.72 kWh/m² to a high of 6.05 kWh/m² in June across the year — August's 5.26 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.5Bright
55.5Bright
65.5Bright
75.5Bright
85.5Bright
95.4Bright
105.4Bright
115.4Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.0Bright
255.0Bright
265.0Bright
274.9Bright
284.9Bright
294.9Bright
304.8Bright
314.8Bright
Planning a trip in August

Is August a good time to visit Carlisle?

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

6.0
Sightseeing
4th-best month of the year
6.7
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Carlisle for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Carlisle in August

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

In August, Carlisle sees daytime highs around 82°F and nights near 65°F. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

UV index in Carlisle in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Carlisle peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 22UV 9Dec 20UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Carlisle in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Carlisle is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (November, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1316 µg/m³Nov 118 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar12Moderate
Apr13Moderate
May14Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Carlisle?

Carlisle sits at 40.2°N, 77.2°W, 479 ft above sea level, in United States. The nearest listed city is Harrisburg, 17 mi away.

Topography around Carlisle

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

Within 2 miles, the terrain around Carlisle has only modest variations in elevation — a maximum elevation change of 180 ft around an average of 482 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,699 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,438 ft.

The land around Carlisle is covered by trees (37%), grassland (27%) and artificial surfaces (27%) within 2 miles, trees (50%), cropland (24%) and grassland (21%) within 10 miles, and trees (60%) and cropland (21%) within 50 miles.

2 miles
180 ft
10 miles
1,699 ft
50 miles
2,438 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Harrisburg 17 mi · York 29 mi · Hanover 30 mi · Chambersburg 31 mi · Lebanon 42 mi · Westminster 45 mi · Hagerstown 48 mi · Lancaster 48 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 Carlisle (40.2015°, -77.1889°, elevation 479 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).