Vandalia weather in August

In August, Vandalia sees average daytime highs of 82°F and overnight lows near 64°F, with 3.1 in of rain across 9.4 wet days and about 13.6 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 82°F through the month. The sky is clear or mostly clear about 35% 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 Vandalia's 2nd-clearest and 12th-windiest month. For the whole year in context, see Vandalia's year-round climate.

Daytime high
82°
2nd warmest
Overnight low
64°
11th coldest
Rainfall
3.1 in
9.4 wet days
Daylight
13 h 36 min
5:53 AM – 7:28 PM
Cloud cover
54%
2nd clearest
Wind
6 mph
12th windiest
Solar energy
5.59 kWh/m²
Travel score
6.5
out of 10

Vandalia is city in Montgomery County, Ohio, United States.

Density
470/km²
people per km²
Founded
1838

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 82°F through the month.

A typical August day in Vandalia reaches about 82°F in the afternoon and slips back to 64°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 89°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)
18365
28365
38365
48365
58265
68265
78265
88265
98265
108265
118265
128264
138264
148264
158264
168264
178264
188264
198264
208264
218264
228264
238264
248264
258263
268263
278163
288163
298163
308162
318162

How August really feels in Vandalia

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.

Vandalia weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan36° / 22°3.19.94.99.50.0
Feb39° / 24°2.594.310.40.1
Mar50° / 32°3.711.12.211.72.1
Apr62° / 43°4.512.50.6134.9
May71° / 53°4.413.1014.26.1
Jun80° / 62°3.911.7014.86.2
Jul83° / 66°3.211.4014.55.7
Aug82° / 64°3.19.4013.66.5
Sep76° / 57°2.77.8012.37.2
Oct64° / 45°2.98.10.210.95.8
Nov51° / 35°3.38.91.19.82.5
Dec40° / 27°3.29.73.39.20.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% 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 44%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25545
35545
45446
55446
65446
75446
85446
95446
105347
115446
125446
135545
145644
155644
165743
175743
185743
195743
205743
215842
225842
235842
245743
255842
265842
275842
285941
295941
305941
315941

Chance of precipitation in August

Any precipitation

Vandalia gets around 3.1 in of rain over 9.4 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 31% and peaks near 34% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
134
233
333
433
532
632
732
832
932
1032
1132
1232
1332
1432
1531
1631
1731
1830
1930
2030
2130
2230
2330
2429
2529
2629
2728
2828
2927
3027
3126

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 26% of days. Sticky, muggy-or-worse air turns up on roughly 36% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11023262714
21123262614
31123262613
41223262513
51223272513
61323272513
71323272413
81423262413
91423262413
101423262412
111523262412
121523252412
131523252511
141523252511
151524252510
161524252610
17152425269
18152425279
19152425279
20152425279
21152425288
22152425288
23152325288
24162324288
25172324288
26182324288
27182224288
28192224278
29202223278
30212223267
31232223257

Wind in August

Winds average 6 mph in August, the calmest month.

Across August, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

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 5:39 AM to 6:08 AM, and sunset from 7:47 PM to 7:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.15:397:47
214.15:407:46
314.15:417:45
414.05:427:44
514.05:437:42
614.05:447:41
713.95:457:40
813.95:467:39
913.95:477:38
1013.85:477:36
1113.85:487:35
1213.75:497:34
1313.75:507:33
1413.75:517:31
1513.65:527:30
1613.65:537:28
1713.55:547:27
1813.55:557:26
1913.55:567:24
2013.45:577:23
2113.45:587:21
2213.35:597:20
2313.36:007:18
2413.36:017:17
2513.26:027:15
2613.26:037:14
2713.16:047:12
2813.16:057:11
2913.16:067:09
3013.06:077:07
3113.06:087:06

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.59 kWh/m².

For context, solar energy here swings from a low near 1.64 kWh/m² to a high of 6.24 kWh/m² in June across the year — August's 5.59 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.9Bright
55.9Bright
65.8Bright
75.8Bright
85.8Bright
95.8Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.6Bright
155.6Bright
165.6Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.4Bright
225.4Bright
235.4Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.2Bright
295.2Bright
305.1Bright
315.1Bright
Planning a trip in August

Is August a good time to visit Vandalia?

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

6.5
Sightseeing
2nd-best month of the year
6.9
Beach & pool
1st-best month of the year

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

What to pack for Vandalia in August

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

In August, Vandalia sees daytime highs around 82°F and nights near 64°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Vandalia in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Vandalia peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 highHighModerateLowJun 20UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun10Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov3Moderate
Dec2Low

Air quality in Vandalia 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 Vandalia is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1117 µg/m³Oct 238 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar12Good
Apr12Moderate
May15Moderate
Jun17Moderate
Jul17Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Vandalia?

Vandalia sits at 39.9°N, 84.2°W, 994 ft above sea level, in United States. The nearest listed city is Huber Heights, 5.0 mi away.

Topography around Vandalia

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

Within 2 miles, the terrain around Vandalia has only modest variations in elevation — a maximum elevation change of 308 ft around an average of 968 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 407 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,040 ft.

The land around Vandalia is covered by trees (32%), grassland (32%) and artificial surfaces (28%) within 2 miles, trees (33%), cropland (29%) and grassland (24%) within 10 miles, and cropland (63%) and trees (21%) within 50 miles.

2 miles
308 ft
10 miles
407 ft
50 miles
1,040 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Huber Heights 5.0 mi · Riverside 8.7 mi · Trotwood 8.7 mi · Dayton 9.3 mi · Troy 11 mi · Fairborn 11 mi · Kettering 14 mi · Beavercreek 14 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 Vandalia (39.8906°, -84.1988°, elevation 994 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).