Indio weather in September

In September, Indio sees average daytime highs of 92°F and overnight lows near 69°F, with 0.3 in of rain across 1.8 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 96°F in the first days to 89°F by the end. The sky is clear or mostly clear about 89% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Indio's 2nd-clearest and 7th-windiest month. For the whole year in context, see Indio's year-round climate.

Daytime high
92°
4th warmest
Overnight low
69°
10th coldest
Rainfall
0.3 in
1.8 wet days
Daylight
12 h 12 min
5:33 AM – 5:45 PM
Cloud cover
14%
2nd clearest
Wind
4 mph
7th windiest
Solar energy
6.39 kWh/m²
Travel score
4.4
out of 10

Indio is city in Riverside County, California, United States.

Density
1,158/km²
people per km²
Founded
1873

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 96°F in the first days to 89°F by the end.

A typical September day in Indio reaches about 92°F in the afternoon and slips back to 69°F overnight — a 23°F spread between the day's warmth and the night's chill. On most days the high lands between 84°F and 99°F. Set against its neighbours, September runs about 6°F cooler than August and about 11°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19674
29673
39673
49573
59573
69572
79472
89472
99471
109471
119371
129370
139370
149269
159269
169269
179268
189168
199168
209167
219167
229067
239067
249066
259066
268966
278965
288965
298865
308864

How September really feels in Indio

Once humidity and wind are folded in, September averages 25 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
25
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Indio weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan62° / 43°1.13.6106.6
Feb65° / 45°1.34.110.77.1
Mar71° / 49°0.72.911.78.1
Apr77° / 54°0.31.512.88.8
May85° / 60°0.10.913.77.0
Jun94° / 68°0.00.214.23.8
Jul99° / 75°0.31.9141.9
Aug98° / 75°0.32.213.32.2
Sep92° / 69°0.31.812.24.4
Oct82° / 59°0.31.211.28.0
Nov70° / 48°0.31.510.38.4
Dec61° / 42°1.02.99.86.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 89% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 6% of September, with mostly cloudy or overcast conditions the remaining 6%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1937
2937
3937
4937
5946
6946
7946
8946
9964
10964
11964
12964
13964
14964
15955
16955
17955
18955
19955
20955
21946
22946
23946
24946
25946
26937
27937
28937
29937
30937

Chance of precipitation in September

Any precipitation

Indio gets around 0.3 in of rain over 1.8 wet days in September. 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 9% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
19
29
39
49
59
68
78
88
98
107
117
126
136
145
155
165
174
184
194
204
214
224
234
244
254
264
274
284
294
304

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1761482
2761482
3761482
4781471
5781471
6791371
7791371
8801361
9811261
10831151
11841051
1285951
1386941
1487841
1589731
1690631
1791531
1891531
1992431
2093421
2193421
2293421
2393421
2494420
2595320
2695320
2795320
2895320
2996310
3096310

Wind in September

Winds average 4 mph in September.

Across September, daily wind ranges from about 4 mph on the calmest days to 4 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 42 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over September. Sunrise moves from 5:23 AM to 5:43 AM, and sunset from 6:07 PM to 5:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:236:07
212.75:236:05
312.75:246:04
412.65:256:03
512.65:256:01
612.65:266:00
712.55:275:58
812.55:275:57
912.55:285:55
1012.45:295:54
1112.45:305:53
1212.35:305:51
1312.35:315:50
1412.35:325:48
1512.25:325:47
1612.25:335:45
1712.25:345:44
1812.15:345:42
1912.15:355:41
2012.15:365:40
2112.05:375:38
2212.05:375:37
2312.05:385:35
2411.95:395:34
2511.95:395:32
2611.85:405:31
2711.85:415:30
2811.85:425:28
2911.75:425:27
3011.75:435:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.39 kWh/m².

For context, solar energy here swings from a low near 3.19 kWh/m² to a high of 8.57 kWh/m² in June across the year — September's 6.39 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.8Intense
26.8Intense
36.7Intense
46.7Intense
56.7Intense
66.7Intense
76.6Intense
86.6Intense
96.6Intense
106.6Intense
116.6Intense
126.5Intense
136.5Intense
146.5Intense
156.5Intense
166.4Intense
176.4Intense
186.4Intense
196.3Intense
206.3Intense
216.2Intense
226.2Intense
236.2Intense
246.1Intense
256.1Intense
266.0Intense
276.0Intense
286.0Bright
295.9Bright
305.9Bright
Planning a trip in September

Is September a good time to visit Indio?

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

4.4
Sightseeing
9th-best month of the year
7.9
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Indio for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Indio in September

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

In September, Indio sees daytime highs around 92°F and nights near 69°F. Pack light clothes and sun protection.

light clothessun protection

UV index in Indio in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Indio peaks around June 23 at about 11 (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 — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 11Dec 17UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5Moderate
Apr8Very high
May9Very high
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Indio in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Indio is worst in September — around 20 µg/m³ PM2.5 (moderate), about 4.3× the cleanest month (December, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodSep 1419 µg/m³Dec 155 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb7Good
Mar8Good
Apr8Good
May7Good
Jun14Moderate
Jul10Good
Aug11Good
Sep20Moderate
Oct6Good
Nov5Good
Dec5Good
Location & terrain

Where is Indio?

Indio sits at 33.7°N, 116.2°W, -13 ft above sea level, in United States. The nearest listed city is Coachella, 3.7 mi away.

Topography around Indio

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

Within 2 miles, the terrain around Indio has only modest variations in elevation — a maximum elevation change of 105 ft around an average of -7 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 4,386 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 11,650 ft.

The land around Indio is covered by artificial surfaces (64%) and bare terrain (24%) within 2 miles, bare terrain (59%) within 10 miles, and bare terrain (54%) and shrubs (26%) within 50 miles.

2 miles
105 ft
10 miles
4,386 ft
50 miles
11,650 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Coachella 3.7 mi · La Quinta 6.8 mi · Palm Desert 9.3 mi · Rancho Mirage 11 mi · Cathedral City 15 mi · Palm Springs 21 mi · Desert Hot Springs 24 mi · Yucca Valley 30 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 Indio (33.7207°, -116.2168°, elevation -13 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).