Yuba City weather in September

In September, Yuba City sees average daytime highs of 88°F and overnight lows near 60°F, with 0.2 in of rain across 1 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 92°F in the first days to 85°F by the end. The sky is clear or mostly clear about 85% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Yuba City's 3rd-clearest and 11th-windiest month. For the whole year in context, see Yuba City's year-round climate.

Daytime high
88°
4th warmest
Overnight low
60°
9th coldest
Rainfall
0.2 in
1 wet days
Daylight
12 h 18 min
5:53 AM – 6:08 PM
Cloud cover
15%
3rd clearest
Wind
5 mph
11th windiest
Solar energy
5.96 kWh/m²
Travel score
5.8
out of 10

Yuba City is city and the county seat of Sutter County, California, United States.

Density
1,723/km²
people per km²
Founded
1849

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 92°F in the first days to 85°F by the end.

A typical September day in Yuba City reaches about 88°F in the afternoon and slips back to 60°F overnight — a 28°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, September runs about 5°F cooler than August and about 10°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19263
29263
39263
49162
59162
69162
79162
89062
99062
109061
119061
128961
138961
148960
158960
168860
178860
188860
198859
208759
218759
228759
238758
248658
258658
268658
278558
288557
298557
308457

How September really feels in Yuba City

Once humidity and wind are folded in, September averages 11 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
11
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.

Yuba City 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
Jan58° / 40°6.110.79.64.2
Feb61° / 43°5.81010.55.1
Mar66° / 46°5.010.311.76.1
Apr72° / 50°2.46.8137.3
May81° / 56°1.44.414.17.4
Jun90° / 62°0.41.414.74.9
Jul95° / 66°0.00.114.53.4
Aug94° / 64°0.00.213.54.0
Sep88° / 60°0.2112.35.8
Oct78° / 52°1.73.6118.1
Nov65° / 44°3.57.59.96.3
Dec57° / 40°6.411.19.34.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 85% of the time in September.

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

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1955
2946
3946
4946
5946
6946
7937
8937
9937
10937
11937
12928
13928
14928
15928
16919
17919
18919
19919
20919
21919
22919
23919
249010
259010
269010
278911
288911
298812
308812

Chance of precipitation in September

Any precipitation

Yuba City gets around 0.2 in of rain over 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 3% and peaks near 7% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
11
21
31
41
51
61
71
81
92
102
112
122
132
143
153
163
173
184
194
204
215
225
235
245
256
266
276
287
297
307

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 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
185132
286122
386122
487112
587112
687112
787112
887112
987112
1087112
1189101
1289101
1389101
1489101
1589101
1690100
1790100
189190
199190
209190
219280
229280
239370
249370
259370
269370
279370
289370
299460
309460

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 5 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
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 5:39 AM to 6:07 AM, and sunset from 6:33 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:396:33
212.95:406:32
312.85:416:30
412.85:426:28
512.75:436:27
612.75:446:25
712.65:456:23
812.65:466:22
912.65:476:20
1012.55:486:18
1112.55:496:17
1212.45:506:15
1312.45:506:13
1412.35:516:12
1512.35:526:10
1612.35:536:08
1712.25:546:07
1812.25:556:05
1912.15:566:03
2012.15:576:02
2112.05:586:00
2212.05:595:58
2311.96:005:57
2411.96:015:55
2511.96:025:53
2611.86:035:52
2711.86:045:50
2811.76:055:48
2911.76:065:47
3011.66:075:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.96 kWh/m².

For context, solar energy here swings from a low near 2 kWh/m² to a high of 8.23 kWh/m² in July across the year — September's 5.96 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.7Intense
26.7Intense
36.6Intense
46.6Intense
56.5Intense
66.5Intense
76.4Intense
86.4Intense
96.3Intense
106.3Intense
116.2Intense
126.1Intense
136.1Intense
146.0Intense
156.0Bright
165.9Bright
175.9Bright
185.8Bright
195.8Bright
205.7Bright
215.7Bright
225.6Bright
235.5Bright
245.5Bright
255.4Bright
265.4Bright
275.3Bright
285.3Bright
295.2Bright
305.1Bright
Planning a trip in September

Hazard calendar for Yuba City

In seasonPeak

None of Yuba City's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Yuba City's rainy season runs November–March, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Yuba City?

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

5.8
Sightseeing
6th-best month of the year
8.6
Beach & pool
1st-best month of the year

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

What to pack for Yuba City in September

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

In September, Yuba City sees daytime highs around 88°F and nights near 60°F. Pack light clothes. Worth having: sun protection.

light clothessun protection

UV index in Yuba City in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Yuba City peaks around June 22 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 22UV 10Dec 14UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep6High
Oct5Moderate
Nov2Low
Dec2Low

Air quality in Yuba City 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 Yuba City is worst in September — around 41 µg/m³ PM2.5 (poor), about 3.8× the cleanest month (June, 11 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModeratePoorModerateSep 1140 µg/m³Jun 911 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb15Moderate
Mar18Moderate
Apr15Moderate
May11Good
Jun11Good
Jul21Moderate
Aug37Poor
Sep41Poor
Oct21Moderate
Nov31Moderate
Dec13Moderate
Location & terrain

Where is Yuba City?

Yuba City sits at 39.1°N, 121.6°W, 59 ft above sea level, in United States. The nearest listed city is South Yuba City, 1.9 mi away.

Topography around Yuba City

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

Within 2 miles, the terrain around Yuba City has only modest variations in elevation — a maximum elevation change of 56 ft around an average of 62 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,040 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,794 ft.

The land around Yuba City is covered by artificial surfaces (48%) and trees (29%) within 2 miles, cropland (38%), grassland (29%) and trees (23%) within 10 miles, and trees (45%), grassland (27%) and cropland (22%) within 50 miles.

2 miles
56 ft
10 miles
1,040 ft
50 miles
5,794 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: South Yuba City 1.9 mi · Linda 3.7 mi · Lincoln 24 mi · Oroville 26 mi · Rocklin 32 mi · Roseville 32 mi · Rio Linda 32 mi · Woodland 33 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 Yuba City (39.1405°, -121.6169°, elevation 59 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).