Los Banos weather in September

In September, Los Banos sees average daytime highs of 88°F and overnight lows near 61°F, with 0.1 in of rain across 0.4 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 91°F in the first days to 85°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 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Los Banos's 3rd-clearest and 7th-windiest month. For the whole year in context, see Los Banos's year-round climate.

Daytime high
88°
4th warmest
Overnight low
61°
10th coldest
Rainfall
0.1 in
0.4 wet days
Daylight
12 h 12 min
5:51 AM – 6:05 PM
Cloud cover
12%
3rd clearest
Wind
4 mph
7th windiest
Solar energy
6.18 kWh/m²
Travel score
6.1
out of 10

Los Banos is city in Merced County, California, United States.

Density
1,430/km²
people per km²
Founded
1907

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 91°F in the first days to 85°F by the end.

A typical September day in Los Banos reaches about 88°F in the afternoon and slips back to 61°F overnight — a 27°F spread between the day's warmth and the night's chill. On most days the high lands between 79°F and 96°F. Set against its neighbours, September runs about 5°F cooler than August and about 9°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19163
29163
39163
49163
59163
69062
79062
89062
98962
108962
118962
128961
138861
148861
158861
168760
178760
188760
198760
208760
218760
228660
238660
248659
258559
268559
278559
288559
298458
308458

How September really feels in Los Banos

Once humidity and wind are folded in, September averages 8 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
8
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.

Los Banos weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan59° / 43°2.77.79.74.8
Feb63° / 45°2.3810.65.8
Mar68° / 47°2.06.911.77.0
Apr75° / 51°0.94.112.98.0
May83° / 56°0.42.1147.6
Jun89° / 61°0.10.514.55.4
Jul94° / 65°0.00.214.33.8
Aug93° / 64°0.00.113.44.3
Sep88° / 61°0.10.412.36.1
Oct78° / 55°0.52118.5
Nov67° / 47°1.04.2107.2
Dec59° / 42°2.16.99.54.9

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 5% of September, with mostly cloudy or overcast conditions the remaining 6%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1973
2973
3973
4964
5964
6955
7955
8955
9955
10955
11955
12955
13955
14955
15946
16946
17946
18946
19937
20937
21928
22928
23928
24928
25919
26919
27919
28919
29919
309010

Chance of precipitation in September

Any precipitation

Los Banos gets around 0.1 in of rain over 0.4 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 2% and peaks near 3% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
11
21
31
41
51
61
71
81
91
101
111
121
131
141
151
162
172
182
192
202
212
222
232
242
252
262
273
283
293
303

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. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1603262
2613162
3623152
4633052
5633052
6642952
7662941
8662941
9662941
10662941
11672931
12672931
13663031
14673030
15663130
16663130
17653230
18653230
19653230
20653230
21663130
22663130
23673120
24683020
25683020
26692920
27702820
28712720
29732610
30752410

Wind in September

Winds average 4 mph in September.

Across September, daily wind ranges from about 4 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
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 48 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 66 minutes over September. Sunrise moves from 5:38 AM to 6:03 AM, and sunset from 6:28 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:386:28
212.85:396:27
312.85:406:25
412.75:416:24
512.75:416:22
612.65:426:20
712.65:436:19
812.65:446:17
912.55:456:16
1012.55:466:14
1112.45:476:13
1212.45:476:11
1312.45:486:09
1412.35:496:08
1512.35:506:06
1612.25:516:05
1712.25:526:03
1812.25:526:02
1912.15:536:00
2012.15:545:58
2112.05:555:57
2212.05:565:55
2311.95:575:54
2411.95:585:52
2511.95:585:50
2611.85:595:49
2711.86:005:47
2811.76:015:46
2911.76:025:44
3011.76:035:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.18 kWh/m².

For context, solar energy here swings from a low near 2.44 kWh/m² to a high of 8.3 kWh/m² in June across the year — September's 6.18 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.9Intense
26.8Intense
36.8Intense
46.7Intense
56.7Intense
66.7Intense
76.6Intense
86.6Intense
96.5Intense
106.5Intense
116.4Intense
126.4Intense
136.3Intense
146.3Intense
156.2Intense
166.2Intense
176.1Intense
186.1Intense
196.0Intense
206.0Bright
215.9Bright
225.8Bright
235.8Bright
245.7Bright
255.7Bright
265.6Bright
275.6Bright
285.5Bright
295.5Bright
305.4Bright
Planning a trip in September

Is September a good time to visit Los Banos?

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

6.1
Sightseeing
6th-best month of the year
8.9
Beach & pool
1st-best month of the year

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

What to pack for Los Banos in September

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

In September, Los Banos sees daytime highs around 88°F and nights near 61°F. Pack light clothes and sun protection.

light clothessun protection

UV index in Los Banos in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Los Banos peaks around June 19 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highHighModerateJun 19UV 10Dec 14UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun10Extreme
Jul10Very high
Aug10Very high
Sep7High
Oct5High
Nov2Moderate
Dec2Moderate

Air quality in Los Banos 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 Los Banos is worst in August — around 19 µg/m³ PM2.5 (moderate), about 3.8× the cleanest month (June, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1918 µg/m³Jun 125 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb8Good
Mar9Good
Apr7Good
May6Good
Jun5Good
Jul9Good
Aug19Moderate
Sep14Moderate
Oct11Good
Nov8Good
Dec7Good
Location & terrain

Where is Los Banos?

Los Banos sits at 37.1°N, 120.8°W, 118 ft above sea level, in United States. The nearest listed city is Atwater, 24 mi away.

Topography around Los Banos

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

Within 2 miles, the terrain around Los Banos has only modest variations in elevation — a maximum elevation change of 56 ft around an average of 118 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,007 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,269 ft.

The land around Los Banos is covered by artificial surfaces (42%) and cropland (26%) within 2 miles, grassland (44%) and cropland (39%) within 10 miles, and grassland (50%), trees (24%) and cropland (20%) within 50 miles.

2 miles
56 ft
10 miles
1,007 ft
50 miles
5,269 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Atwater 24 mi · Merced 26 mi · Turlock 30 mi · Patterson 32 mi · Chowchilla 33 mi · Hollister 34 mi · Ceres 37 mi · Gilroy 40 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 Los Banos (37.0583°, -120.8499°, elevation 118 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).