Twin Falls weather in August

In August, Twin Falls sees average daytime highs of 89°F and overnight lows near 59°F, with 0.3 in of rain across 1.9 wet days and about 13.7 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 92°F in the first days to 86°F by the end. The sky is clear or mostly clear about 69% of the time in August, and the air most often feels dry.

Daylight stretches from about 14 h 18 min at the start of August to 13 h 06 min by month's end. Set against the rest of the year, August is Twin Falls's 2nd-clearest and 12th-windiest month. For the whole year in context, see Twin Falls's year-round climate.

Daytime high
89°
2nd warmest
Overnight low
59°
11th coldest
Rainfall
0.3 in
1.9 wet days
Daylight
13 h 42 min
5:50 AM – 7:34 PM
Cloud cover
29%
2nd clearest
Wind
6 mph
12th windiest
Solar energy
7.05 kWh/m²
Travel score
5.2
out of 10

Twin Falls is city in and county seat of Twin Falls County, Idaho, United States.

Density
1,009/km²
people per km²
Founded
1904

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 92°F in the first days to 86°F by the end.

A typical August day in Twin Falls reaches about 89°F in the afternoon and slips back to 59°F overnight — a 30°F spread between the day's warmth and the night's chill. On most days the high lands between 79°F and 97°F. Set against its neighbours, August runs about 2°F cooler than July and about 11°F warmer than September.

40°60°80°100°151015202531
Avg high (°F)Avg low (°F)
19262
29262
39261
49261
59261
69161
79161
89161
99160
109160
119160
129160
139060
149060
159060
169059
178959
188959
198959
208958
218958
228858
238858
248858
258757
268757
278757
288656
298656
308656
318555

How August really feels in Twin Falls

Once humidity and wind are folded in, August averages 16 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
16
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.

Twin Falls 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° / 24°1.596.29.20.0
Feb44° / 27°1.17.44.210.30.8
Mar54° / 33°1.48.82.711.63.3
Apr61° / 38°1.48.21.413.15.3
May71° / 46°1.57.50.114.47.0
Jun81° / 53°0.84.2015.17.3
Jul91° / 60°0.21.7014.84.6
Aug89° / 59°0.31.9013.75.2
Sep78° / 50°0.62.8012.38.1
Oct64° / 40°0.94.60.410.86.6
Nov49° / 30°1.26.82.99.62.2
Dec38° / 24°1.68.86.28.90.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 69% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 16% of August, with mostly cloudy or overcast conditions the remaining 15%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18416
28416
38416
48416
58416
68416
78416
88416
98416
108515
118515
128614
138614
148713
158713
168713
178713
188713
198713
208713
218713
228713
238614
248614
258515
268515
278416
288416
298317
308317
318218

Chance of precipitation in August

Any precipitation

Twin Falls gets around 0.3 in of rain over 1.9 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 6% and peaks near 7% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
17
27
37
47
57
67
77
87
97
107
116
126
136
146
155
165
175
185
195
205
215
225
235
245
255
266
276
286
296
307
317

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 (%)
1982
2982
3982
4982
5982
6982
7982
8982
9982
10982
11982
12982
13982
14982
15982
16982
17982
18982
19991
20991
21991
22991
23991
24991
25991
26991
27991
28991
29991
30991
31991

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

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 h 18 min at the start of August to 13 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over August. Sunrise moves from 5:33 AM to 6:06 AM, and sunset from 7:54 PM to 7:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.35:337:54
214.35:357:53
314.35:367:52
414.25:377:51
514.25:387:50
614.25:397:48
714.15:407:47
814.15:417:46
914.05:427:44
1014.05:437:43
1114.05:447:42
1213.95:457:40
1313.95:467:39
1413.85:477:37
1513.85:487:36
1613.75:507:34
1713.75:517:33
1813.75:527:31
1913.65:537:30
2013.65:547:28
2113.55:557:27
2213.55:567:25
2313.45:577:23
2413.45:587:22
2513.35:597:20
2613.36:017:18
2713.26:027:17
2813.26:037:15
2913.26:047:13
3013.16:057:11
3113.16:067:10

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 7.05 kWh/m².

For context, solar energy here swings from a low near 1.85 kWh/m² to a high of 7.98 kWh/m² in July across the year — August's 7.05 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.5Intense
27.5Intense
37.5Intense
47.4Intense
57.4Intense
67.4Intense
77.3Intense
87.3Intense
97.3Intense
107.3Intense
117.2Intense
127.2Intense
137.2Intense
147.2Intense
157.1Intense
167.1Intense
177.0Intense
187.0Intense
197.0Intense
206.9Intense
216.9Intense
226.9Intense
236.8Intense
246.8Intense
256.7Intense
266.7Intense
276.6Intense
286.6Intense
296.5Intense
306.5Intense
316.4Intense
Planning a trip in August

Is August a good time to visit Twin Falls?

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
8.2
Beach & pool
1st-best month of the year

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

What to pack for Twin Falls in August

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

In August, Twin Falls sees daytime highs around 89°F and nights near 59°F. Pack light clothes and sun protection.

light clothessun protection

UV index in Twin Falls in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Twin Falls peaks around June 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 19UV 9Dec 13UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr5Moderate
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov2Low
Dec2Low

Air quality in Twin Falls 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 Twin Falls is worst in August — around 19 µg/m³ PM2.5 (moderate), about 3.3× the cleanest month (December, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1918 µg/m³Dec 186 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb8Good
Mar10Good
Apr9Good
May9Good
Jun8Good
Jul16Moderate
Aug19Moderate
Sep17Moderate
Oct8Good
Nov7Good
Dec6Good
Location & terrain

Where is Twin Falls?

Twin Falls sits at 42.6°N, 114.5°W, 3,734 ft above sea level, in United States. The nearest listed city is Pocatello, 104 mi away.

Topography around Twin Falls

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

Within 2 miles, the terrain around Twin Falls has only modest variations in elevation — a maximum elevation change of 220 ft around an average of 3,727 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,634 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,808 ft.

The land around Twin Falls is covered by artificial surfaces (52%) within 2 miles, cropland (57%) and grassland (30%) within 10 miles, and grassland (73%) and cropland (22%) within 50 miles.

2 miles
220 ft
10 miles
1,634 ft
50 miles
7,808 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Pocatello 104 mi · Boise 114 mi · Kuna 118 mi · Meridian 121 mi · Eagle 124 mi · Nampa 126 mi · Caldwell 135 mi · Elko 137 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 Twin Falls (42.563°, -114.4609°, elevation 3,734 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).