Walla Walla weather in August

In August, Walla Walla sees average daytime highs of 83°F and overnight lows near 56°F, with 0.4 in of rain across 2.1 wet days and about 14 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 86°F in the first days to 80°F by the end. The sky is clear or mostly clear about 72% of the time in August, and the air most often feels dry.

Daylight stretches from about 14 h 42 min at the start of August to 13 h 12 min by month's end. Set against the rest of the year, August is Walla Walla's 2nd-clearest and 11th-windiest month. For the whole year in context, see Walla Walla's year-round climate.

Daytime high
83°
2nd warmest
Overnight low
56°
11th coldest
Rainfall
0.4 in
2.1 wet days
Daylight
14 hours
4:58 AM – 6:57 PM
Cloud cover
26%
2nd clearest
Wind
5 mph
11th windiest
Solar energy
6.78 kWh/m²
Travel score
7.5
out of 10

Walla Walla is city in Walla Walla County, Washington, United States.

Density
970/km²
people per km²
Founded
1856

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 86°F in the first days to 80°F by the end.

A typical August day in Walla Walla reaches about 83°F in the afternoon and slips back to 56°F overnight — a 27°F spread between the day's warmth and the night's chill. On most days the high lands between 72°F and 93°F. Set against its neighbours, August runs on par with July and about 10°F warmer than September.

40°60°80°100°151015202531
Avg high (°F)Avg low (°F)
18658
28658
38658
48558
58558
68558
78558
88558
98557
108557
118457
128457
138457
148457
158356
168356
178356
188356
198256
208255
218255
228255
238155
248155
258154
268054
278054
288054
298053
307953
317953

How August really feels in Walla Walla

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.

Walla Walla weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan39° / 29°3.314.28.68.90.0
Feb44° / 30°2.6126.3100.6
Mar50° / 34°2.913.4511.62.2
Apr58° / 38°2.211.51.713.34.0
May66° / 45°2.19.70.214.76.2
Jun74° / 50°1.36.3015.57.5
Jul84° / 57°0.32015.27.3
Aug83° / 56°0.42.10147.5
Sep73° / 49°0.84.1012.38.1
Oct60° / 40°2.18.80.310.75.0
Nov46° / 33°3.313.65.19.21.1
Dec38° / 28°3.614.39.28.50.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 72% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 13% of August, with mostly cloudy or overcast conditions the remaining 14%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18812
28812
38812
48812
58713
68713
78614
88614
98614
108614
118614
128515
138515
148515
158515
168416
178416
188416
198416
208515
218416
228515
238515
248515
258515
268515
278515
288515
298515
308515
318515

Chance of precipitation in August

Any precipitation

Walla Walla gets around 0.4 in of rain over 2.1 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 7% and peaks near 9% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
15
25
35
46
56
66
76
86
96
106
116
126
136
147
157
167
177
187
197
207
217
227
237
248
258
268
278
288
299
309
319

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 98% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1973
2973
3973
4973
5973
6973
7973
8973
9973
10982
11982
12982
13982
14982
15991
16991
17991
18991
19991
20991
21991
22991
23991
24991
25991
26991
27991
28991
29991
30991
31991

Wind in August

Winds average 5 mph in August.

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 14 h 42 min at the start of August to 13 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 90 minutes over August. Sunrise moves from 4:39 AM to 5:17 AM, and sunset from 7:19 PM to 6:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.74:397:19
214.64:417:18
314.64:427:17
414.54:437:15
514.54:447:14
614.44:467:13
714.44:477:11
814.44:487:10
914.34:497:08
1014.34:517:07
1114.24:527:05
1214.24:537:03
1314.14:547:02
1414.14:567:00
1514.04:576:58
1614.04:586:57
1713.94:596:55
1813.95:016:53
1913.85:026:52
2013.85:036:50
2113.75:056:48
2213.75:066:46
2313.65:076:44
2413.65:086:43
2513.55:106:41
2613.55:116:39
2713.45:126:37
2813.45:146:35
2913.35:156:33
3013.35:166:31
3113.25:176:29

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 6.78 kWh/m².

For context, solar energy here swings from a low near 1.28 kWh/m² to a high of 7.84 kWh/m² in July across the year — August's 6.78 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.5Intense
27.4Intense
37.4Intense
47.3Intense
57.3Intense
67.3Intense
77.2Intense
87.2Intense
97.1Intense
107.1Intense
117.0Intense
127.0Intense
137.0Intense
146.9Intense
156.8Intense
166.8Intense
176.8Intense
186.7Intense
196.7Intense
206.6Intense
216.5Intense
226.5Intense
236.4Intense
246.4Intense
256.3Intense
266.3Intense
276.2Intense
286.1Intense
296.1Intense
306.0Intense
316.0Bright
Planning a trip in August

Hazard calendar for Walla Walla

In seasonPeak

None of Walla Walla's seasonal hazards are active in August. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Walla Walla's rainy season runs October–May, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Walla Walla?

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

7.5
Sightseeing
2nd-best month of the year
8.6
Beach & pool
2nd-best month of the year

August is one of the better times to visit Walla Walla for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Walla Walla in August

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

In August, Walla Walla sees daytime highs around 83°F and nights near 56°F. Pack light clothes and sun protection.

light clothessun protection

UV index in Walla Walla in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Walla Walla peaks around July 15 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highVery highHighModerateLowJul 15UV 8Dec 15UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5Moderate
May7Very high
Jun7High
Jul9Very high
Aug6High
Sep5Moderate
Oct4Moderate
Nov1Low
Dec1Low

Air quality in Walla Walla 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 Walla Walla is worst in August — around 29 µg/m³ PM2.5 (moderate), about 4.4× the cleanest month (December, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1827 µg/m³Dec 237 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb8Good
Mar11Good
Apr11Good
May9Good
Jun9Good
Jul16Moderate
Aug29Moderate
Sep20Moderate
Oct12Moderate
Nov12Good
Dec7Good
Location & terrain

Where is Walla Walla?

Walla Walla sits at 46.1°N, 118.3°W, 942 ft above sea level, in United States. The nearest listed city is Pendleton, 35 mi away.

Topography around Walla Walla

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

Within 2 miles, the terrain around Walla Walla has only modest variations in elevation — a maximum elevation change of 272 ft around an average of 945 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,333 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 6,115 ft.

The land around Walla Walla is covered by artificial surfaces (34%), trees (26%) and grassland (23%) within 2 miles, cropland (67%) and grassland (23%) within 10 miles, and grassland (44%), cropland (29%) and trees (24%) within 50 miles.

2 miles
272 ft
10 miles
3,333 ft
50 miles
6,115 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Pendleton 35 mi · Pasco 39 mi · Kennewick 39 mi · Tri-Cities 43 mi · Richland 48 mi · Hermiston 48 mi · Lewiston 68 mi · Lewiston Orchards 69 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 Walla Walla (46.0646°, -118.343°, elevation 942 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).