San Luis weather in August

In August, San Luis sees average daytime highs of 106°F and overnight lows near 84°F, with 0.4 in of rain across 2.9 wet days and about 13.2 hours of daylight. It is the 2nd-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 106°F through the month. The sky is clear or mostly clear about 81% of the time in August, and the air most often feels muggy.

Daylight stretches from about 13 h 36 min at the start of August to 12 h 42 min by month's end. Set against the rest of the year, August is San Luis's 6th-clearest and 3rd-windiest month. For the whole year in context, see San Luis's year-round climate.

Daytime high
106°
2nd warmest
Overnight low
84°
12th coldest
Rainfall
0.4 in
2.9 wet days
Daylight
13 h 12 min
6:07 AM – 7:19 PM
Cloud cover
21%
6th clearest
Wind
6 mph
3rd windiest
Solar energy
7.12 kWh/m²
Travel score
0.0
out of 10

San Luis is city in Yuma County, Arizona, United States.

Density
356/km²
people per km²
Founded
1930

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 106°F through the month.

A typical August day in San Luis reaches about 106°F in the afternoon and slips back to 84°F overnight — a 22°F spread between the day's warmth and the night's chill. On most days the high lands between 101°F and 111°F. Set against its neighbours, August runs on par with July and about 5°F warmer than September.

80°90°100°110°151015202531
Avg high (°F)Avg low (°F)
110684
210684
310684
410684
510684
610684
710684
810684
910684
1010684
1110684
1210684
1310684
1410684
1510684
1610684
1710684
1810684
1910584
2010584
2110583
2210583
2310583
2410583
2510583
2610583
2710583
2810583
2910583
3010483
3110482

How August really feels in San Luis

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
31 feel dangerously hot (≥ 102°F)
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.

San Luis weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan71° / 49°0.41.510.18.4
Feb74° / 52°0.52.310.88.6
Mar81° / 56°0.41.511.88.1
Apr87° / 61°0.10.612.86.1
May95° / 68°0.00.213.63.5
Jun103° / 75°0.00.214.10.7
Jul106° / 83°0.21.513.90.0
Aug106° / 84°0.42.913.20.0
Sep101° / 78°0.52.212.21.2
Oct91° / 67°0.20.911.24.9
Nov78° / 56°0.20.810.38.6
Dec69° / 48°0.41.79.98.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 81% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 10% of August, with mostly cloudy or overcast conditions the remaining 9%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18713
28713
38713
48812
58911
68911
79010
89010
9919
10928
11928
12928
13937
14937
15937
16937
17937
18937
19937
20937
21937
22937
23937
24937
25937
26928
27928
28928
29928
30928
31928

Chance of precipitation in August

Any precipitation

San Luis gets around 0.4 in of rain over 2.9 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 9% and peaks near 12% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
17
27
37
48
58
68
78
88
98
108
118
128
138
148
158
168
178
189
199
209
219
2210
2310
2410
2511
2611
2711
2811
2912
3012
3112

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 32% of days. Sticky, muggy-or-worse air turns up on roughly 50% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
114172532110
214172532120
314172432120
415172432130
515172432130
615162332130
715162332140
815162332140
915152333140
1015152332151
1115142333151
1214142233161
1314132234161
1414132234171
1513122234171
1613122234171
1713122234181
1813122234181
1913112234182
2013112233182
2113112233182
2214112233192
2314112232192
2414112232193
2515102231193
2615102231193
2715102231193
2816102131193
2916102131203
3017102130203
311792030203

Wind in August

Winds average 6 mph in August.

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
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 36 min at the start of August to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 54 minutes over August. Sunrise moves from 5:57 AM to 6:17 AM, and sunset from 7:34 PM to 7:01 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.65:577:34
213.65:577:33
313.65:587:32
413.55:597:31
513.56:007:30
613.56:007:29
713.56:017:28
813.46:027:28
913.46:027:27
1013.46:037:26
1113.36:047:25
1213.36:047:24
1313.36:057:23
1413.36:067:22
1513.26:067:20
1613.26:077:19
1713.26:087:18
1813.16:087:17
1913.16:097:16
2013.16:107:15
2113.16:107:14
2213.06:117:12
2313.06:127:11
2413.06:127:10
2512.96:137:09
2612.96:147:08
2712.96:147:06
2812.86:157:05
2912.86:167:04
3012.86:167:03
3112.76:177:01

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 7.12 kWh/m².

For context, solar energy here swings from a low near 3.4 kWh/m² to a high of 8.49 kWh/m² in June across the year — August's 7.12 kWh/m² falls in the middle.

02468151015202531
Solar energy (kWh/m²)Level
17.4Intense
27.4Intense
37.4Intense
47.4Intense
57.4Intense
67.4Intense
77.3Intense
87.3Intense
97.3Intense
107.3Intense
117.3Intense
127.2Intense
137.2Intense
147.2Intense
157.2Intense
167.1Intense
177.1Intense
187.1Intense
197.0Intense
207.0Intense
217.0Intense
226.9Intense
236.9Intense
246.9Intense
256.8Intense
266.8Intense
276.8Intense
286.8Intense
296.7Intense
306.7Intense
316.7Intense
Planning a trip in August

Is August a good time to visit San Luis?

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

0.0
Sightseeing
11th-best month of the year
2.4
Beach & pool
11th-best month of the year

August is a weaker month for outdoor sightseeing in San Luis.

What to pack for San Luis in August

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

In August, San Luis sees daytime highs around 106°F and nights near 84°F. Pack light clothes and sun protection.

light clothessun protection

UV index in San Luis 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 San Luis peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highExtremeVery highHighModerateJun 23UV 11Dec 18UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5Moderate
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug10Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate
Location & terrain

Where is San Luis?

San Luis sits at 32.5°N, 114.8°W, 131 ft above sea level, in United States. The nearest listed city is San Luis Río Colorado, 2.5 mi away.

Topography around San Luis

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

Within 2 miles, the terrain around San Luis has only modest variations in elevation — a maximum elevation change of 89 ft around an average of 118 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 180 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,652 ft.

The land around San Luis is covered by artificial surfaces (46%), bare terrain (26%) and cropland (24%) within 2 miles, bare terrain (45%) and cropland (41%) within 10 miles, and bare terrain (73%) within 50 miles.

2 miles
89 ft
10 miles
180 ft
50 miles
3,652 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: San Luis Río Colorado 2.5 mi · Somerton 8.7 mi · Yuma 19 mi · Ciudad Guadalupe Victoria 23 mi · Fortuna Foothills 25 mi · Puebla 34 mi · Mexicali 40 mi · Calexico 43 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 San Luis (32.487°, -114.7822°, elevation 131 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).