Blythe weather in September

In September, Blythe sees average daytime highs of 100°F and overnight lows near 77°F, with 0.4 in of rain across 2.1 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 104°F in the first days to 97°F by the end. The sky is clear or mostly clear about 86% 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 Blythe's 2nd-clearest and 12th-windiest month. For the whole year in context, see Blythe's year-round climate.

Daytime high
100°
4th warmest
Overnight low
77°
10th coldest
Rainfall
0.4 in
2.1 wet days
Daylight
12 h 12 min
5:27 AM – 5:39 PM
Cloud cover
17%
2nd clearest
Wind
6 mph
12th windiest
Solar energy
6.24 kWh/m²
Travel score
1.4
out of 10

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

Density
271/km²
people per km²
Founded
1916

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 104°F in the first days to 97°F by the end.

A typical September day in Blythe reaches about 100°F in the afternoon and slips back to 77°F overnight — a 23°F spread between the day's warmth and the night's chill. On most days the high lands between 93°F and 107°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)
110482
210482
310482
410381
510381
610381
710380
810280
910280
1010279
1110179
1210179
1310178
1410178
1510078
1610077
1710077
1810076
1910076
209976
219975
229975
239875
249874
259874
269774
279773
289773
299672
309672

How September really feels in Blythe

Once humidity and wind are folded in, September averages 30 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
30
8 feel dangerously hot (≥ 102°F)
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.

Blythe weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan68° / 47°0.52.2107.9
Feb72° / 50°0.72.410.88.3
Mar79° / 55°0.4211.78.4
Apr86° / 61°0.10.812.86.8
May94° / 69°0.10.313.73.8
Jun103° / 77°0.00.314.20.7
Jul107° / 84°0.32140.0
Aug106° / 84°0.42.813.20.0
Sep100° / 77°0.42.112.21.4
Oct89° / 65°0.20.911.25.5
Nov76° / 53°0.30.910.38.8
Dec66° / 46°0.41.89.87.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 86% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 8% of September, with mostly cloudy or overcast conditions the remaining 7%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1919
2919
3919
4919
5919
6928
7937
8937
9937
10937
11946
12946
13946
14955
15955
16946
17946
18946
19955
20955
21955
22946
23946
24946
25937
26937
27937
28937
29937
30937

Chance of precipitation in September

Any precipitation

Blythe gets around 0.4 in of rain over 2.1 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 7% and peaks near 10% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
110
210
310
410
510
610
710
89
99
108
118
128
137
147
156
166
176
185
195
205
215
225
235
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 66% of days. Sticky, muggy-or-worse air turns up on roughly 11% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1421920155
2421820155
3441820144
4451720144
5461719134
6481719134
7501618124
8511618124
9531517114
10571416103
11581415103
1261131493
1364121383
1465121283
1568111173
1669111172
1772101062
187310962
19759961
20779851
21789751
22798751
23798751
24818650
25818650
26818650
27828550
28838540
29848440
30848440

Wind in September

Winds average 6 mph in September, the calmest month.

Across September, 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.

0246810151015202530
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

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 5:16 AM to 5:37 AM, and sunset from 6:00 PM to 5:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:166:00
212.75:175:59
312.75:185:57
412.65:185:56
512.65:195:55
612.65:205:53
712.55:205:52
812.55:215:50
912.55:225:49
1012.45:225:47
1112.45:235:46
1212.35:245:45
1312.35:245:43
1412.35:255:42
1512.25:265:40
1612.25:275:39
1712.25:275:37
1812.15:285:36
1912.15:295:35
2012.15:295:33
2112.05:305:32
2212.05:315:30
2312.05:315:29
2411.95:325:27
2511.95:335:26
2611.85:345:25
2711.85:345:23
2811.85:355:22
2911.75:365:20
3011.75:375:19

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.24 kWh/m².

For context, solar energy here swings from a low near 3.26 kWh/m² to a high of 8.53 kWh/m² in June across the year — September's 6.24 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.6Intense
26.6Intense
36.5Intense
46.5Intense
56.5Intense
66.5Intense
76.5Intense
86.4Intense
96.4Intense
106.4Intense
116.4Intense
126.3Intense
136.3Intense
146.3Intense
156.3Intense
166.3Intense
176.2Intense
186.2Intense
196.2Intense
206.2Intense
216.1Intense
226.1Intense
236.0Intense
246.0Intense
256.0Bright
265.9Bright
275.9Bright
285.9Bright
295.8Bright
305.8Bright
Planning a trip in September

Is September a good time to visit Blythe?

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

1.4
Sightseeing
9th-best month of the year
4.8
Beach & pool
7th-best month of the year

September is a weaker month for outdoor sightseeing in Blythe.

What to pack for Blythe in September

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

In September, Blythe sees daytime highs around 100°F and nights near 77°F. Pack light clothes and sun protection.

light clothessun protection

UV index in Blythe 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 Blythe peaks around June 23 at about 10 (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 — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highExtremeVery highHighModerateJun 23UV 10Dec 18UV 3
UV index (midday)Level
Jan4Moderate
Feb4Moderate
Mar4Moderate
Apr7Very high
May8Very high
Jun11Extreme
Jul10Extreme
Aug11Extreme
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate
Location & terrain

Where is Blythe?

Blythe sits at 33.6°N, 114.6°W, 272 ft above sea level, in United States. The nearest listed city is Yuma, 61 mi away.

Topography around Blythe

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

Within 2 miles, the terrain around Blythe has only modest variations in elevation — a maximum elevation change of 30 ft around an average of 269 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,677 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,580 ft.

The land around Blythe is covered by cropland (44%), bare terrain (22%) and artificial surfaces (21%) within 2 miles, bare terrain (55%) and cropland (29%) within 10 miles, and bare terrain (86%) within 50 miles.

2 miles
30 ft
10 miles
1,677 ft
50 miles
4,580 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Yuma 61 mi · Lake Havasu City 62 mi · Fortuna Foothills 66 mi · Brawley 70 mi · Somerton 70 mi · Imperial 77 mi · San Luis 78 mi · El Centro 80 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 Blythe (33.6103°, -114.5964°, elevation 272 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).