Rolla weather in August

In August, Rolla sees average daytime highs of 86°F and overnight lows near 67°F, with 2.9 in of rain across 9.5 wet days and about 13.5 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 86°F through the month. The sky is clear or mostly clear about 40% of the time in August, and the air most often feels muggy.

Daylight stretches from about 14 hours at the start of August to 12 h 54 min by month's end. Set against the rest of the year, August is Rolla's 3rd-clearest and 11th-windiest month. For the whole year in context, see Rolla's year-round climate.

Daytime high
86°
2nd warmest
Overnight low
67°
11th coldest
Rainfall
2.9 in
9.5 wet days
Daylight
13 h 30 min
5:27 AM – 6:56 PM
Cloud cover
52%
3rd clearest
Wind
5 mph
11th windiest
Solar energy
5.75 kWh/m²
Travel score
5.0
out of 10

Rolla is city in and county seat of Phelps County, Missouri, United States.

Density
641/km²
people per km²
Founded
1844

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 86°F through the month.

A typical August day in Rolla reaches about 86°F in the afternoon and slips back to 67°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 78°F and 95°F. Set against its neighbours, August runs about 2°F cooler than July and about 7°F warmer than September.

60°80°100°151015202531
Avg high (°F)Avg low (°F)
18769
28768
38768
48768
58768
68768
78768
88768
98768
108767
118767
128767
138767
148767
158767
168767
178767
188767
198667
208667
218666
228666
238666
248666
258666
268666
278666
288565
298565
308565
318565

How August really feels in Rolla

Once humidity and wind are folded in, August averages 2 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
2
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.

Rolla 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
Jan42° / 25°2.77.63.19.70.1
Feb46° / 28°2.57.62.610.51.4
Mar56° / 37°3.610.81.611.73.8
Apr67° / 47°4.811.80.2135.8
May74° / 56°5.013.30146.3
Jun83° / 65°3.811.3014.65.5
Jul88° / 69°3.510.7014.44.5
Aug86° / 67°2.99.5013.55.0
Sep79° / 59°3.37.9012.37.0
Oct68° / 47°3.38.70.1116.6
Nov55° / 37°3.48.20.99.93.7
Dec45° / 29°2.67.72.19.40.9

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% 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 41%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15644
25644
35644
45644
55644
65743
75743
85743
95743
105743
115743
125842
135842
145842
155941
166040
176139
186139
196139
206238
216238
226238
236238
246139
256139
266139
276139
286238
296238
306238
316238

Chance of precipitation in August

Any precipitation

Rolla gets around 2.9 in of rain over 9.5 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 35% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
334
434
534
633
733
833
932
1032
1132
1232
1331
1431
1531
1631
1730
1830
1930
2029
2129
2229
2329
2429
2529
2629
2728
2828
2928
3028
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 37% of days. Sticky, muggy-or-worse air turns up on roughly 58% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
13142036271
23142036261
34132037261
44132037251
54132037251
65132037251
75142037240
85141937240
96141937240
106141936240
117151936230
127151936230
137151936230
147161935220
158161935220
168162035220
178162035210
188162035210
198162036210
208162036200
218152037200
228152037190
238152038190
248152138190
258142139180
268142139170
278152139170
289152139160
299152239150
3010162238140
3110162238130

Wind in August

Winds average 5 mph in August.

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
175calm
185calm
195calm
205calm
215calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 hours 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 66 minutes over August. Sunrise moves from 5:14 AM to 5:40 AM, and sunset from 7:13 PM to 6:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.05:147:13
214.05:147:12
313.95:157:11
413.95:167:10
513.95:177:09
613.85:187:08
713.85:197:06
813.85:207:05
913.75:217:04
1013.75:217:03
1113.75:227:02
1213.65:237:01
1313.65:246:59
1413.65:256:58
1513.55:266:57
1613.55:276:56
1713.45:286:54
1813.45:296:53
1913.45:296:52
2013.35:306:50
2113.35:316:49
2213.35:326:47
2313.25:336:46
2413.25:346:45
2513.15:356:43
2613.15:366:42
2713.15:376:40
2813.05:376:39
2913.05:386:37
3012.95:396:36
3112.95:406:34

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.75 kWh/m².

For context, solar energy here swings from a low near 2.01 kWh/m² to a high of 6.41 kWh/m² in June across the year — August's 5.75 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.0Intense
36.0Intense
46.0Intense
56.0Bright
66.0Bright
76.0Bright
85.9Bright
95.9Bright
105.9Bright
115.9Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.6Bright
225.6Bright
235.6Bright
245.5Bright
255.5Bright
265.5Bright
275.4Bright
285.4Bright
295.4Bright
305.3Bright
315.3Bright
Planning a trip in August

Is August a good time to visit Rolla?

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

5.0
Sightseeing
6th-best month of the year
7.0
Beach & pool
1st-best month of the year

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

What to pack for Rolla in August

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

In August, Rolla sees daytime highs around 86°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 Rolla 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 Rolla peaks around June 22 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 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 highHighModerateJun 22UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5High
Apr7Very high
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep7High
Oct4Moderate
Nov4Moderate
Dec2Moderate

Air quality in Rolla 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 Rolla is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (November, 6 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1516 µg/m³Nov 146 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb10Good
Mar11Good
Apr9Good
May12Moderate
Jun14Moderate
Jul16Moderate
Aug13Moderate
Sep11Good
Oct6Good
Nov6Good
Dec7Good
Location & terrain

Where is Rolla?

Rolla sits at 38.0°N, 91.8°W, 1,122 ft above sea level, in United States. The nearest listed city is Fort Leonard Wood, 27 mi away.

Topography around Rolla

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

Within 2 miles, the terrain around Rolla has only modest variations in elevation — a maximum elevation change of 308 ft around an average of 1,073 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 633 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,060 ft.

The land around Rolla is covered by trees (55%) and artificial surfaces (24%) within 2 miles, trees (66%) and grassland (30%) within 10 miles, and trees (73%) and grassland (23%) within 50 miles.

2 miles
308 ft
10 miles
633 ft
50 miles
1,060 ft
treesgrasslandcroplandartificial surfacesbare terrain
August weather nearby: Fort Leonard Wood 27 mi · Jefferson City 48 mi · Wildwood 75 mi · Farmington 75 mi · Columbia 76 mi · Wentzville 78 mi · Ballwin 80 mi · Chesterfield 81 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 Rolla (37.9514°, -91.7713°, elevation 1,122 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).