Frederick weather in August

In August, Frederick sees average daytime highs of 85°F and overnight lows near 67°F, with 3.0 in of rain across 9.9 wet days and about 13.5 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 86°F in the first days to 83°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 12 h 54 min by month's end. Set against the rest of the year, August is Frederick's 3rd-clearest and 12th-windiest month. For the whole year in context, see Frederick's year-round climate.

Daytime high
85°
2nd warmest
Overnight low
67°
11th coldest
Rainfall
3.0 in
9.9 wet days
Daylight
13 h 36 min
5:27 AM – 7:01 PM
Cloud cover
58%
3rd clearest
Wind
5 mph
12th windiest
Solar energy
5.35 kWh/m²
Travel score
5.4
out of 10

Frederick is city in Frederick County, Maryland, United States.

Density
1,156/km²
people per km²
Founded
1745

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 86°F in the first days to 83°F by the end.

A typical August day in Frederick reaches about 85°F in the afternoon and slips back to 67°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 77°F and 92°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)
18668
28668
38668
48668
58668
68668
78568
88567
98567
108567
118567
128567
138567
148567
158567
168567
178567
188466
198466
208466
218466
228466
238466
248466
258465
268365
278365
288365
298365
308365
318364

How August really feels in Frederick

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.

Frederick 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
Jan40° / 26°3.18.73.39.50.0
Feb43° / 27°2.78.53.610.50.6
Mar52° / 35°3.810.22.511.72.8
Apr64° / 45°3.510.20.2135.6
May73° / 54°3.711.8014.16.4
Jun82° / 64°3.410.8014.75.8
Jul87° / 68°3.610.5014.54.8
Aug85° / 67°3.09.9013.55.4
Sep78° / 59°4.29.2012.36.9
Oct66° / 47°3.47.90116.3
Nov54° / 37°3.07.90.49.83.4
Dec44° / 30°3.48.82.29.30.8

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 48%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14951
24951
35050
45050
55149
65149
75149
85149
95149
105149
115149
125149
135149
145149
155149
165248
175248
185347
195347
205347
215347
225248
235248
245248
255347
265248
275248
285248
295248
305248
315248

Chance of precipitation in August

Any precipitation

Frederick gets around 3.0 in of rain over 9.9 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 32% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
133
233
333
433
533
633
734
834
934
1035
1135
1235
1335
1435
1535
1635
1734
1834
1933
2033
2132
2231
2331
2430
2530
2629
2729
2829
2929
3028
3128

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 30% of days. Sticky, muggy-or-worse air turns up on roughly 42% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11015283512
21015283413
31116273413
41116263313
51217263313
61217253214
71217253214
81217253115
91218253115
101218253015
111218253015
121218253014
131218253014
141218263014
151219263013
161219263013
171219273012
181219273012
191219283011
201220283010
21122028309
22132028309
23132128308
24142127308
25142227298
26152226298
27162325288
28172324278
29182323278
30192323268
31202422268

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
25calm
35calm
45calm
55calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
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 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over August. Sunrise moves from 5:13 AM to 5:41 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)
114.15:137:19
214.15:147:17
314.05:157:16
414.05:167:15
514.05:177:14
613.95:177:13
713.95:187:12
813.95:197:11
913.85:207:10
1013.85:217:08
1113.75:227:07
1213.75:237:06
1313.75:247:05
1413.65:257:03
1513.65:267:02
1613.65:277:01
1713.55:286:59
1813.55:296:58
1913.45:306:56
2013.45:316:55
2113.45:326:53
2213.35:336:52
2313.35:346:51
2413.25:356:49
2513.25:366:48
2613.25:366:46
2713.15:376:44
2813.15:386:43
2913.05:396:41
3013.05:406:40
3112.95:416:38

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.35 kWh/m².

For context, solar energy here swings from a low near 1.86 kWh/m² to a high of 6.15 kWh/m² in June across the year — August's 5.35 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.6Bright
45.6Bright
55.6Bright
65.6Bright
75.6Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.4Bright
135.4Bright
145.4Bright
155.4Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.1Bright
255.1Bright
265.1Bright
275.0Bright
285.0Bright
295.0Bright
304.9Bright
314.9Bright
Planning a trip in August

Is August a good time to visit Frederick?

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

5.4
Sightseeing
6th-best month of the year
6.9
Beach & pool
1st-best month of the year

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

What to pack for Frederick in August

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

In August, Frederick sees daytime highs around 85°F and nights near 67°F. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Frederick 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 Frederick peaks around July 10 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 highHighModerateLowJul 10UV 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 Frederick 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 Frederick 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 1317 µg/m³Nov 138 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar12Moderate
Apr12Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep12Good
Oct9Good
Nov8Good
Dec9Good
Location & terrain

Where is Frederick?

Frederick sits at 39.4°N, 77.4°W, 285 ft above sea level, in United States. The nearest listed city is Ballenger Creek, 3.1 mi away.

Topography around Frederick

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

Within 2 miles, the terrain around Frederick has only modest variations in elevation — a maximum elevation change of 482 ft around an average of 312 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,791 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,756 ft.

The land around Frederick is covered by artificial surfaces (41%), trees (28%) and grassland (23%) within 2 miles, trees (47%), grassland (25%) and cropland (22%) within 10 miles, and trees (59%) and grassland (20%) within 50 miles.

2 miles
482 ft
10 miles
1,791 ft
50 miles
2,756 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Ballenger Creek 3.1 mi · Damascus 14 mi · Germantown 18 mi · Montgomery Village 20 mi · Gaithersburg 22 mi · Leesburg 22 mi · Hagerstown 23 mi · Redland 24 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 Frederick (39.4143°, -77.4105°, elevation 285 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).