Grand Canyon weather in August

In August, Grand Canyon sees average daytime highs of 88°F and overnight lows near 63°F, with 0.8 in of rain across 5.1 wet days and about 13.4 hours of daylight. It is the 2nd-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 89°F in the first days to 86°F by the end. The sky is clear or mostly clear about 58% of the time in August, and the air most often feels dry.

Daylight stretches from about 13 h 48 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Grand Canyon's 6th-clearest and 12th-windiest month. For the whole year in context, see Grand Canyon's year-round climate.

Daytime high
88°
2nd warmest
Overnight low
63°
11th coldest
Rainfall
0.8 in
5.1 wet days
Daylight
13 h 24 min
5:51 AM – 7:14 PM
Cloud cover
38%
6th clearest
Wind
5 mph
12th windiest
Solar energy
6.87 kWh/m²
Travel score
5.2
out of 10

Grand Canyon is human settlement in Coconino County, Arizona, United States of America.

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 89°F in the first days to 86°F by the end.

A typical August day in Grand Canyon reaches about 88°F in the afternoon and slips back to 63°F overnight — a 25°F spread between the day's warmth and the night's chill. On most days the high lands between 81°F and 94°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)
18965
28965
38965
48965
58964
68964
78964
88964
98964
108964
118964
128964
138964
148864
158864
168863
178863
188863
198863
208863
218863
228763
238763
248763
258762
268762
278762
288762
298662
308662
318661

How August really feels in Grand Canyon

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.

Grand Canyon weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan46° / 25°1.45.33.49.81.3
Feb50° / 29°1.56.53.810.62.5
Mar58° / 34°1.15.21.911.75.0
Apr65° / 40°0.84.11.212.97.1
May76° / 49°0.42.20.113.98.5
Jun87° / 58°0.10.9014.46.2
Jul90° / 65°0.85.5014.24.4
Aug88° / 63°0.85.1013.45.2
Sep81° / 56°0.83.9012.27.7
Oct69° / 44°0.83.50.311.18.0
Nov57° / 33°0.83.61.210.14.9
Dec46° / 26°1.25.33.69.61.4

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 58% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 23% of August, with mostly cloudy or overcast conditions the remaining 19%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17228
27327
37327
47426
57426
67624
77723
87822
97921
108020
118218
128218
138218
148317
158317
168416
178416
188416
198416
208515
218515
228416
238416
248416
258416
268416
278416
288416
298416
308416
318515

Chance of precipitation in August

Any precipitation

Grand Canyon gets around 0.8 in of rain over 5.1 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 17% and peaks near 19% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
119
219
319
418
518
617
717
817
916
1016
1116
1216
1316
1416
1516
1616
1717
1817
1917
2017
2117
2217
2317
2417
2517
2617
2717
2817
2917
3017
3117

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the dry band about 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
184124
284124
385123
486113
586113
686113
788102
888102
98992
109091
119181
129181
139181
149181
159181
169280
179280
189280
199280
209280
219181
229181
239181
249181
259181
269271
279271
289271
299271
309271
319271

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 13 h 48 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 60 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)
113.85:397:30
213.85:407:29
313.85:417:28
413.85:427:27
513.75:427:26
613.75:437:25
713.75:447:24
813.65:457:23
913.65:467:22
1013.65:467:21
1113.55:477:20
1213.55:487:19
1313.55:497:18
1413.45:507:16
1513.45:507:15
1613.45:517:14
1713.35:527:13
1813.35:537:12
1913.35:547:10
2013.25:557:09
2113.25:557:08
2213.25:567:06
2313.15:577:05
2413.15:587:04
2513.15:597:02
2613.05:597:01
2713.06:007:00
2813.06:016:58
2912.96:026:57
3012.96:036:55
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 6.87 kWh/m².

For context, solar energy here swings from a low near 2.96 kWh/m² to a high of 8.54 kWh/m² in June across the year — August's 6.87 kWh/m² falls in the middle.

02468151015202531
Solar energy (kWh/m²)Level
17.1Intense
27.1Intense
37.1Intense
47.1Intense
57.1Intense
67.1Intense
77.0Intense
87.0Intense
97.0Intense
107.0Intense
117.0Intense
127.0Intense
137.0Intense
146.9Intense
156.9Intense
166.9Intense
176.9Intense
186.8Intense
196.8Intense
206.8Intense
216.8Intense
226.7Intense
236.7Intense
246.7Intense
256.7Intense
266.6Intense
276.6Intense
286.6Intense
296.5Intense
306.5Intense
316.5Intense
Planning a trip in August

Is August a good time to visit Grand Canyon?

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

5.2
Sightseeing
6th-best month of the year
7.7
Beach & pool
3rd-best month of the year

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

What to pack for Grand Canyon in August

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

In August, Grand Canyon sees daytime highs around 88°F and nights near 63°F. Pack light clothes and sun protection. About 5 days see rain.

light clothessun protection

UV index in Grand Canyon in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Grand Canyon peaks around July 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highModerateJul 17UV 12Dec 17UV 3
UV index (midday)Level
Jan4Moderate
Feb4Moderate
Mar6High
Apr6High
May9Very high
Jun11Extreme
Jul12Extreme
Aug11Extreme
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate
Location & terrain

Where is Grand Canyon?

Grand Canyon sits at 36.1°N, 112.1°W, 0 ft above sea level, in United States. The nearest listed city is Flagstaff, 65 mi away.

Topography around Grand Canyon

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

Within 2 miles, the terrain around Grand Canyon has large variations in elevation — a maximum elevation change of 3,527 ft around an average of 6,434 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 5,873 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 8,550 ft.

The land around Grand Canyon is covered by trees (71%) within 2 miles, trees (45%) and grassland (21%) within 10 miles, and grassland (42%), trees (23%) and bare terrain (23%) within 50 miles.

2 miles
3,527 ft
10 miles
5,873 ft
50 miles
8,550 ft
treesshrubsgrasslandartificial surfacesbare terrainwater
August weather nearby: Flagstaff 65 mi · Sedona 85 mi · Prescott Valley 100 mi · Hurricane 100 mi · Prescott 106 mi · Washington 106 mi · Saint George 108 mi · Mesquite 119 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 Grand Canyon (36.0544°, -112.1393°, elevation 0 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).