Siloam Springs weather in August

In August, Siloam Springs sees average daytime highs of 89°F and overnight lows near 69°F, with 2.9 in of rain across 9 wet days and about 13.4 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 89°F through the month. The sky is clear or mostly clear about 48% of the time in August, and the air most often feels muggy.

Daylight stretches from about 13 h 54 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Siloam Springs's 3rd-clearest and 12th-windiest month. For the whole year in context, see Siloam Springs's year-round climate.

Daytime high
89°
2nd warmest
Overnight low
69°
11th coldest
Rainfall
2.9 in
9 wet days
Daylight
13 h 24 min
5:41 AM – 7:04 PM
Cloud cover
46%
3rd clearest
Wind
5 mph
12th windiest
Solar energy
5.95 kWh/m²
Travel score
4.5
out of 10

Siloam Springs is city in Arkansas, United States.

Density
557/km²
people per km²
Founded
1881

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 89°F through the month.

A typical August day in Siloam Springs reaches about 89°F in the afternoon and slips back to 69°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 80°F and 97°F. Set against its neighbours, August runs on par with July and about 7°F warmer than September.

60°70°80°90°100°151015202531
Avg high (°F)Avg low (°F)
19071
29070
39070
49070
58970
68970
78970
88970
98970
108970
118969
128969
138969
148969
158969
168969
178969
188969
198969
208969
218969
228869
238868
248868
258868
268868
278868
288868
298768
308767
318767

How August really feels in Siloam Springs

Once humidity and wind are folded in, August averages 27 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
27
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Siloam Springs 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
Jan46° / 29°2.67.11.79.81.5
Feb51° / 32°2.67.21.510.62.7
Mar60° / 40°4.110.21.111.74.8
Apr68° / 49°5.411012.96.2
May76° / 58°5.412.80.113.96.4
Jun84° / 67°4.211014.45.4
Jul89° / 71°3.39.7014.24.2
Aug89° / 69°2.99013.44.5
Sep82° / 62°4.07.8012.26.7
Oct70° / 50°4.08.2011.17.1
Nov58° / 40°3.380.310.14.7
Dec48° / 32°2.87.51.59.62.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 48% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 19% of August, with mostly cloudy or overcast conditions the remaining 33%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16634
26535
36535
46535
56535
66535
76535
86535
96535
106535
116535
126535
136535
146634
156634
166733
176733
186733
196832
206832
216832
226931
236931
246832
256931
266931
276931
287030
297030
307030
316931

Chance of precipitation in August

Any precipitation

Siloam Springs gets around 2.9 in of rain over 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 29% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
130
230
330
431
531
631
731
831
931
1031
1131
1231
1331
1430
1530
1630
1729
1829
1928
2028
2128
2228
2328
2428
2528
2628
2728
2828
2928
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 42% of days. Sticky, muggy-or-worse air turns up on roughly 68% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1061744331
2061744331
3061744331
4161744321
5161743321
6161743321
7161742321
8261742321
9271841321
10271841321
11371840311
12381840311
13381839301
14481939301
15491939291
16492039280
17492039270
18492140260
19492140250
20492141240
21492241230
22492242220
234102342210
244102342210
255102343200
265102343190
275102443190
285112442180
296112442170
306112442170
317122441160

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 6 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
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 54 min at the start of August to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over August. Sunrise moves from 5:28 AM to 5:53 AM, and sunset from 7:20 PM to 6:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.95:287:20
213.85:297:19
313.85:307:18
413.85:317:17
513.75:327:16
613.75:327:15
713.75:337:14
813.65:347:13
913.65:357:12
1013.65:367:11
1113.65:377:10
1213.55:377:09
1313.55:387:07
1413.55:397:06
1513.45:407:05
1613.45:417:04
1713.45:417:03
1813.35:427:01
1913.35:437:00
2013.25:446:59
2113.25:456:57
2213.25:466:56
2313.15:466:55
2413.15:476:53
2513.15:486:52
2613.05:496:51
2713.05:506:49
2813.05:506:48
2912.95:516:46
3012.95:526:45
3112.85:536:44

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.95 kWh/m².

For context, solar energy here swings from a low near 2.23 kWh/m² to a high of 6.57 kWh/m² in July across the year — August's 5.95 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.2Intense
46.2Intense
56.2Intense
66.2Intense
76.1Intense
86.1Intense
96.1Intense
106.0Intense
116.0Intense
126.0Intense
136.0Bright
146.0Bright
155.9Bright
165.9Bright
175.9Bright
185.9Bright
195.9Bright
205.8Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.7Bright
265.7Bright
275.7Bright
285.6Bright
295.6Bright
305.5Bright
315.5Bright
Planning a trip in August

Is August a good time to visit Siloam Springs?

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

4.5
Sightseeing
8th-best month of the year
6.9
Beach & pool
2nd-best month of the year

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

What to pack for Siloam Springs in August

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

In August, Siloam Springs sees daytime highs around 89°F and nights near 69°F. Pack light clothes. Worth having: rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Siloam Springs in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Siloam Springs peaks around July 12 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highHighModerateJul 12UV 10Dec 22UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr8Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep8Very high
Oct5High
Nov4Moderate
Dec2Moderate

Air quality in Siloam Springs 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 Siloam Springs is worst in July — around 19 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (November, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodGoodModerateGoodJul 1518 µg/m³Nov 236 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb9Good
Mar12Moderate
Apr11Good
May13Moderate
Jun16Moderate
Jul19Moderate
Aug15Moderate
Sep11Good
Oct7Good
Nov6Good
Dec6Good
Location & terrain

Where is Siloam Springs?

Siloam Springs sits at 36.2°N, 94.5°W, 1,132 ft above sea level, in United States. The nearest listed city is Bentonville, 22 mi away.

Topography around Siloam Springs

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

Within 2 miles, the terrain around Siloam Springs has only modest variations in elevation — a maximum elevation change of 207 ft around an average of 1,142 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 640 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,031 ft.

The land around Siloam Springs is covered by grassland (40%), trees (32%) and artificial surfaces (21%) within 2 miles, trees (47%) and grassland (43%) within 10 miles, and trees (60%) and grassland (33%) within 50 miles.

2 miles
207 ft
10 miles
640 ft
50 miles
2,031 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Bentonville 22 mi · Springdale 23 mi · Fayetteville 23 mi · Bella Vista 25 mi · Rogers 25 mi · Tahlequah 30 mi · Van Buren 53 mi · Muskogee 55 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 Siloam Springs (36.1881°, -94.5405°, elevation 1,132 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).