Chillicothe weather in August

In August, Chillicothe sees average daytime highs of 84°F and overnight lows near 65°F, with 2.9 in of rain across 9.9 wet days and about 13.5 hours of daylight. It is the 2nd-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 84°F through the month. The sky is clear or mostly clear about 37% 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 Chillicothe's 2nd-clearest and 12th-windiest month. For the whole year in context, see Chillicothe's year-round climate.

Daytime high
84°
2nd warmest
Overnight low
65°
11th coldest
Rainfall
2.9 in
9.9 wet days
Daylight
13 h 36 min
5:49 AM – 7:23 PM
Cloud cover
53%
2nd clearest
Wind
5 mph
12th windiest
Solar energy
5.55 kWh/m²
Travel score
5.7
out of 10

Chillicothe is city in and the county seat of Ross County, Ohio, United States.

Density
792/km²
people per km²
Founded
1803

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 84°F through the month.

A typical August day in Chillicothe reaches about 84°F in the afternoon and slips back to 65°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 77°F and 91°F. Set against its neighbours, August runs on par with July and about 6°F warmer than September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18467
28467
38467
48466
58466
68466
78466
88466
98466
108466
118466
128466
138466
148466
158465
168465
178465
188465
198465
208465
218465
228465
238465
248365
258365
268365
278364
288364
298364
308364
318364

How August really feels in Chillicothe

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.

Chillicothe weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan39° / 25°3.310.54.49.50.0
Feb42° / 27°3.19.6410.50.4
Mar52° / 35°4.111.2211.72.7
Apr64° / 45°4.312.40.4135.3
May73° / 55°4.513014.16.2
Jun81° / 64°4.012.2014.75.9
Jul85° / 67°3.712014.55.2
Aug84° / 65°2.99.9013.55.7
Sep78° / 58°3.08.2012.37.1
Oct66° / 47°2.98.70.1116.1
Nov53° / 37°3.19.20.79.83.1
Dec43° / 30°3.410.22.69.30.5

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% 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 42%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25545
35545
45644
55644
65545
75545
85644
95644
105545
115545
125545
135644
145644
155743
165743
175842
185842
195941
205941
216040
226040
235941
246040
256040
266040
276139
286040
296040
306040
316040

Chance of precipitation in August

Any precipitation

Chillicothe gets around 2.9 in of rain over 9.9 wet days in August, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 33% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
334
434
533
633
733
833
933
1033
1134
1234
1334
1434
1534
1633
1733
1833
1932
2032
2132
2232
2332
2432
2531
2631
2731
2830
2930
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 28% of days. Sticky, muggy-or-worse air turns up on roughly 44% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1717273019
2817273018
3817273018
4917273018
5917272917
6917272917
71018272917
81018272816
91118272816
101118272816
111118272816
121219262716
131219262716
141219252716
151219262815
161319252715
171319252815
181319252815
191319252815
201319252815
211320242815
221320242815
231320242915
241320232915
251420232914
261421232914
271421222914
281521222814
291522222813
301623212813
311623212712

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 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 5:35 AM to 6:04 AM, and sunset from 7:41 PM to 7:00 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.15:357:41
214.15:367:40
314.05:377:39
414.05:387:37
514.05:397:36
613.95:407:35
713.95:417:34
813.95:427:33
913.85:437:32
1013.85:447:30
1113.75:457:29
1213.75:467:28
1313.75:477:27
1413.65:477:25
1513.65:487:24
1613.65:497:23
1713.55:507:21
1813.55:517:20
1913.45:527:19
2013.45:537:17
2113.45:547:16
2213.35:557:14
2313.35:567:13
2413.25:577:11
2513.25:587:10
2613.25:597:08
2713.16:007:07
2813.16:017:05
2913.06:027:04
3013.06:037:02
3112.96:047:00

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.55 kWh/m².

For context, solar energy here swings from a low near 1.68 kWh/m² to a high of 6.18 kWh/m² in June across the year — August's 5.55 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.8Bright
55.8Bright
65.8Bright
75.7Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.4Bright
225.4Bright
235.4Bright
245.3Bright
255.3Bright
265.3Bright
275.2Bright
285.2Bright
295.2Bright
305.1Bright
315.1Bright
Planning a trip in August

Is August a good time to visit Chillicothe?

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

5.7
Sightseeing
5th-best month of the year
7.1
Beach & pool
1st-best month of the year

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

What to pack for Chillicothe in August

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

In August, Chillicothe sees daytime highs around 84°F and nights near 65°F. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Chillicothe in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Chillicothe peaks around June 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 19UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun10Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov3Moderate
Dec2Low

Air quality in Chillicothe 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 Chillicothe is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1218 µg/m³Oct 248 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar10Good
Apr11Good
May14Moderate
Jun17Moderate
Jul18Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov8Good
Dec8Good
Location & terrain

Where is Chillicothe?

Chillicothe sits at 39.3°N, 83.0°W, 630 ft above sea level, in United States. The nearest listed city is Lancaster, 34 mi away.

Topography around Chillicothe

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

Within 2 miles, the terrain around Chillicothe has only modest variations in elevation — a maximum elevation change of 469 ft around an average of 673 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 778 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 892 ft.

The land around Chillicothe is covered by trees (36%), grassland (28%) and artificial surfaces (25%) within 2 miles, trees (58%) and cropland (22%) within 10 miles, and trees (53%) and cropland (31%) within 50 miles.

2 miles
469 ft
10 miles
778 ft
50 miles
892 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Lancaster 34 mi · Grove City 39 mi · Pickerington 40 mi · Portsmouth 42 mi · Columbus 43 mi · Reynoldsburg 44 mi · Whitehall 44 mi · Upper Arlington 46 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 Chillicothe (39.3331°, -82.9824°, elevation 630 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).