Stillwater weather in August

In August, Stillwater sees average daytime highs of 91°F and overnight lows near 72°F, with 2.6 in of rain across 6.9 wet days and about 13.4 hours of daylight. It is the 2nd-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 93°F in the first days to 90°F by the end. The sky is clear or mostly clear about 53% 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 Stillwater's 4th-clearest and 12th-windiest month. For the whole year in context, see Stillwater's year-round climate.

Daytime high
91°
2nd warmest
Overnight low
72°
11th coldest
Rainfall
2.6 in
6.9 wet days
Daylight
13 h 24 min
5:51 AM – 7:14 PM
Cloud cover
41%
4th clearest
Wind
6 mph
12th windiest
Solar energy
6.19 kWh/m²
Travel score
3.9
out of 10

Stillwater is city in Oklahoma, United States.

Density
630/km²
people per km²
Founded
1884

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 93°F in the first days to 90°F by the end.

A typical August day in Stillwater reaches about 91°F in the afternoon and slips back to 72°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 83°F and 100°F. Set against its neighbours, August runs on par with July and about 8°F warmer than September.

60°70°80°90°100°151015202531
Avg high (°F)Avg low (°F)
19373
29373
39373
49373
59273
69273
79273
89273
99273
109273
119272
129272
139272
149272
159272
169172
179172
189172
199171
209171
219171
229171
239171
249171
259171
269171
279071
289070
299070
309070
318969

How August really feels in Stillwater

Once humidity and wind are folded in, August averages 31 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
31
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.

Stillwater weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan48° / 30°1.55.31.39.82.1
Feb53° / 33°1.85.71.310.63.4
Mar62° / 42°2.98.10.711.75.6
Apr71° / 50°4.19012.96.8
May79° / 60°4.811.2013.96.5
Jun88° / 69°4.19.9014.44.6
Jul93° / 73°2.97.4014.23.5
Aug91° / 72°2.66.9013.43.9
Sep83° / 64°3.17.3012.26.3
Oct72° / 52°3.27.60.111.17.4
Nov60° / 41°2.05.70.410.15.5
Dec50° / 32°1.85.41.39.62.5

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 53% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 26%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17426
27426
37426
47426
57327
67327
77426
87327
97327
107327
117228
127228
137228
147327
157327
167327
177327
187327
197327
207525
217525
227525
237426
247525
257525
267426
277426
287525
297426
307426
317426

Chance of precipitation in August

Any precipitation

Stillwater gets around 2.6 in of rain over 6.9 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 23% and peaks near 23% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
123
223
323
423
523
623
723
823
923
1023
1123
1223
1323
1423
1523
1623
1723
1822
1922
2022
2122
2222
2322
2422
2522
2622
2722
2822
2922
3023
3123

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 45% of days. Sticky, muggy-or-worse air turns up on roughly 66% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
107204230
207204330
307204329
406204430
506214429
606214428
716214428
816214427
916224427
1017224426
1117224426
1217234425
1317234424
1427234423
1528244522
1628244521
1728244520
1828254619
1929254618
2029254718
2129254717
2229254716
2329254716
24310254815
25310254815
26310254715
27310254714
28311264714
29411264613
30511264513
31612264413

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 7 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
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

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 5:39 AM to 6:03 AM, and sunset from 7:30 PM to 6:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.95:397:30
213.85:397:29
313.85:407:28
413.85:417:27
513.75:427:26
613.75:437:25
713.75:437:24
813.65:447:23
913.65:457:22
1013.65:467:21
1113.55:477:20
1213.55:487:19
1313.55:487:17
1413.55:497:16
1513.45:507:15
1613.45:517:14
1713.35:527:13
1813.35:527:11
1913.35:537:10
2013.25:547:09
2113.25:557:07
2213.25:567:06
2313.15:577:05
2413.15:577:03
2513.15:587:02
2613.05:597:01
2713.06:006:59
2813.06:016:58
2912.96:016:56
3012.96:026:55
3112.86:036:54

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 6.19 kWh/m².

For context, solar energy here swings from a low near 2.4 kWh/m² to a high of 6.84 kWh/m² in July across the year — August's 6.19 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.6Intense
26.5Intense
36.5Intense
46.5Intense
56.5Intense
66.4Intense
76.4Intense
86.4Intense
96.3Intense
106.3Intense
116.3Intense
126.3Intense
136.2Intense
146.2Intense
156.2Intense
166.2Intense
176.2Intense
186.1Intense
196.1Intense
206.1Intense
216.1Intense
226.0Intense
236.0Intense
246.0Bright
256.0Bright
265.9Bright
275.9Bright
285.8Bright
295.8Bright
305.7Bright
315.7Bright
Planning a trip in August

Is August a good time to visit Stillwater?

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

3.9
Sightseeing
8th-best month of the year
6.9
Beach & pool
2nd-best month of the year

August is a weaker month for outdoor sightseeing in Stillwater. The water and warmth also suit a beach or pool day.

What to pack for Stillwater in August

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

In August, Stillwater sees daytime highs around 91°F and nights near 72°F. Pack light clothes and sun protection. About 7 days see rain.

light clothessun protection

UV index in Stillwater in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Stillwater peaks around July 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highHighModerateJul 12UV 10Dec 21UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr9Very high
May8Very high
Jun10Very high
Jul10Very high
Aug10Very high
Sep7Very high
Oct5High
Nov4Moderate
Dec2Moderate

Air quality in Stillwater 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 Stillwater is worst in July — around 15 µg/m³ PM2.5 (moderate), about 3.3× the cleanest month (November, 5 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodJul 1815 µg/m³Nov 165 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar12Good
Apr13Moderate
May11Good
Jun12Moderate
Jul15Moderate
Aug13Moderate
Sep9Good
Oct5Good
Nov5Good
Dec5Good
Location & terrain

Where is Stillwater?

Stillwater sits at 36.1°N, 97.1°W, 896 ft above sea level, in United States. The nearest listed city is Edmond, 40 mi away.

Topography around Stillwater

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

Within 2 miles, the terrain around Stillwater has only modest variations in elevation — a maximum elevation change of 138 ft around an average of 902 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 341 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 719 ft.

The land around Stillwater is covered by trees (35%), artificial surfaces (33%) and grassland (24%) within 2 miles, grassland (50%) and trees (39%) within 10 miles, and grassland (47%) and trees (32%) within 50 miles.

2 miles
138 ft
10 miles
341 ft
50 miles
719 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Edmond 40 mi · Ponca City 41 mi · Enid 50 mi · Midwest City 50 mi · Del City 51 mi · Oklahoma City 52 mi · Bethany 52 mi · Sand Springs 53 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 Stillwater (36.1156°, -97.0584°, elevation 896 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).