Chambersburg weather in August

In August, Chambersburg sees average daytime highs of 82°F and overnight lows near 65°F, with 2.8 in of rain across 9.1 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 11th-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 30% of the time in August, and the air most often feels muggy.

Daylight stretches from about 14 h 06 min at the start of August to 13 hours by month's end. Set against the rest of the year, August is Chambersburg's 3rd-clearest and 12th-windiest month. For the whole year in context, see Chambersburg's year-round climate.

Daytime high
82°
2nd warmest
Overnight low
65°
11th coldest
Rainfall
2.8 in
9.1 wet days
Daylight
13 h 36 min
5:27 AM – 7:02 PM
Cloud cover
58%
3rd clearest
Wind
5 mph
12th windiest
Solar energy
5.31 kWh/m²
Travel score
6.2
out of 10

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 Chambersburg reaches about 82°F in the afternoon and slips back to 65°F overnight — a 18°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)
18466
28466
38366
48366
58366
68366
78365
88365
98365
108365
118365
128365
138365
148365
158265
168265
178265
188264
198264
208264
218264
228264
238264
248264
258164
268163
278163
288163
298163
308163
318062

How August really feels in Chambersburg

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.

Chambersburg 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
Jan37° / 23°3.194.39.50.0
Feb40° / 25°2.78.54.310.40.2
Mar49° / 32°3.810.53.211.72.1
Apr62° / 43°3.6110.4135.0
May71° / 52°3.812.4014.26.1
Jun80° / 61°3.510.8014.86.3
Jul84° / 66°3.510.1014.55.5
Aug82° / 65°2.89.1013.66.2
Sep75° / 57°4.09.3012.36.9
Oct63° / 46°3.38.20.210.95.8
Nov51° / 36°3.18.20.99.82.7
Dec41° / 28°3.38.62.79.20.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% 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
35050
45050
55149
65050
75050
85149
95149
105149
115149
125149
135149
145149
155248
165248
175248
185248
195347
205248
215248
225248
235149
245248
255248
265149
275248
285149
295149
305149
315248

Chance of precipitation in August

Any precipitation

Chambersburg gets around 2.8 in of rain over 9.1 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 30% and peaks near 32% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
132
232
332
432
532
632
732
832
932
1032
1132
1232
1332
1432
1532
1632
1731
1831
1930
2030
2129
2228
2328
2427
2527
2627
2727
2826
2927
3027
3127

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 28% of days. Sticky, muggy-or-worse air turns up on roughly 33% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1132029335
2132028335
3142128335
4142128325
5142127325
6152127325
7152226326
8152226316
9162226316
10162225306
11162325306
12162326306
13162326296
14172326296
15172326285
16172426285
17172427285
18182427274
19182427274
20182427274
21192427274
22192526263
23202526263
24212525263
25212525253
26222624253
27232623244
28242622244
29252621234
30262721234
31272720234

Wind in August

Winds average 5 mph in August, the calmest month.

Across August, daily wind ranges from about 5 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
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
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 06 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 66 minutes over August. Sunrise moves from 5:13 AM to 5:42 AM, and sunset from 7:21 PM to 6:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.15:137:21
214.15:147:20
314.15:157:19
414.05:157:17
514.05:167:16
614.05:177:15
713.95:187:14
813.95:197:13
913.95:207:12
1013.85:217:10
1113.85:227:09
1213.75:237:08
1313.75:247:06
1413.75:257:05
1513.65:267:04
1613.65:277:02
1713.55:287:01
1813.55:297:00
1913.55:306:58
2013.45:316:57
2113.45:326:55
2213.35:336:54
2313.35:346:52
2413.35:356:51
2513.25:366:49
2613.25:376:48
2713.15:386:46
2813.15:396:44
2913.15:406:43
3013.05:416:41
3113.05:426:40

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.31 kWh/m².

For context, solar energy here swings from a low near 1.75 kWh/m² to a high of 6.08 kWh/m² in June across the year — August's 5.31 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.6Bright
35.6Bright
45.6Bright
55.6Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.4Bright
125.4Bright
135.4Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.1Bright
235.1Bright
245.1Bright
255.0Bright
265.0Bright
275.0Bright
284.9Bright
294.9Bright
304.9Bright
314.8Bright
Planning a trip in August

Is August a good time to visit Chambersburg?

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

6.2
Sightseeing
3rd-best month of the year
6.9
Beach & pool
2nd-best month of the year

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

What to pack for Chambersburg in August

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

In August, Chambersburg sees daytime highs around 82°F and nights near 65°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Chambersburg in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Chambersburg 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 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 22UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7High
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Chambersburg 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 Chambersburg is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1316 µg/m³Nov 137 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar12Good
Apr12Good
May14Moderate
Jun16Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov7Good
Dec8Good
Location & terrain

Where is Chambersburg?

Chambersburg sits at 39.9°N, 77.7°W, 617 ft above sea level, in United States. The nearest listed city is Hagerstown, 21 mi away.

Topography around Chambersburg

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

Within 2 miles, the terrain around Chambersburg has only modest variations in elevation — a maximum elevation change of 220 ft around an average of 659 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,877 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,802 ft.

The land around Chambersburg is covered by trees (30%), artificial surfaces (29%) and grassland (26%) within 2 miles, trees (40%), cropland (34%) and grassland (21%) within 10 miles, and trees (64%) within 50 miles.

2 miles
220 ft
10 miles
1,877 ft
50 miles
2,802 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Hagerstown 21 mi · Carlisle 31 mi · Martinsburg 37 mi · Hanover 37 mi · Frederick 39 mi · Ballenger Creek 41 mi · Westminster 43 mi · Harrisburg 47 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 Chambersburg (39.9376°, -77.6611°, elevation 617 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).