Redding weather in September

In September, Redding sees average daytime highs of 89°F and overnight lows near 61°F, with 0.5 in of rain across 1.7 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 84°F by the end. The sky is clear or mostly clear about 80% 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 Redding's 3rd-clearest and 10th-windiest month. For the whole year in context, see Redding's year-round climate.

Daytime high
89°
4th warmest
Overnight low
61°
9th coldest
Rainfall
0.5 in
1.7 wet days
Daylight
12 h 18 min
5:56 AM – 6:12 PM
Cloud cover
19%
3rd clearest
Wind
4 mph
10th windiest
Solar energy
5.83 kWh/m²
Travel score
5.6
out of 10

Redding is city in Shasta County, California, United States.

Density
578/km²
people per km²
Founded
1887

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 84°F by the end.

A typical September day in Redding reaches about 89°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 77°F and 99°F. Set against its neighbours, September runs about 7°F cooler than August and about 12°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19365
29364
39264
49264
59264
69264
79163
89163
99163
109062
119062
129062
138962
148962
158961
168961
178861
188860
198860
208760
218760
228760
238659
248659
258659
268558
278558
288558
298458
308357

How September really feels in Redding

Once humidity and wind are folded in, September averages 12 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
12
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.

Redding 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 daysSnow daysDaylight (hours)Travel score
Jan54° / 39°9.312.529.43.2
Feb58° / 41°8.511.51.510.44.0
Mar63° / 44°7.512.31.111.75.3
Apr69° / 47°3.79.10.2136.6
May79° / 55°2.36.2014.27.4
Jun89° / 62°1.02.8014.85.1
Jul97° / 69°0.10.4014.62.7
Aug95° / 67°0.20.6013.63.3
Sep89° / 61°0.51.7012.35.6
Oct76° / 52°2.74.6010.98.0
Nov61° / 44°5.68.80.59.75.3
Dec53° / 39°9.912.91.79.22.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 80% of the time in September.

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

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1946
2946
3946
4946
5946
6946
7946
8937
9928
10928
11928
12928
139010
149010
159010
169010
178911
188911
198812
208812
218812
228812
238713
248713
258713
268614
278515
288515
298515
308416

Chance of precipitation in September

Any precipitation

Redding gets around 0.5 in of rain over 1.7 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 (%)
13
23
33
43
53
64
74
84
95
105
115
126
136
146
156
166
176
186
197
207
217
227
237
247
258
268
278
288
299
309

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 97% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
19631
29631
39631
49631
59631
69631
79631
89631
99631
109631
119730
129730
139730
149730
159730
169730
179730
189730
199730
209730
219820
229820
239820
249820
259820
269820
279820
289820
299820
309820

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 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 5:41 AM to 6:10 AM, and sunset from 6:38 PM to 5:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:416:38
212.95:426:36
312.95:436:34
412.85:446:33
512.85:456:31
612.75:466:29
712.75:476:27
812.65:486:26
912.65:496:24
1012.55:506:22
1112.55:516:21
1212.45:526:19
1312.45:536:17
1412.45:546:15
1512.35:556:14
1612.35:566:12
1712.25:576:10
1812.25:586:08
1912.15:596:07
2012.16:006:05
2112.06:016:03
2212.06:026:01
2311.96:036:00
2411.96:045:58
2511.96:055:56
2611.86:065:54
2711.86:075:53
2811.76:085:51
2911.76:095:49
3011.66:105:47

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.83 kWh/m².

For context, solar energy here swings from a low near 1.78 kWh/m² to a high of 8.1 kWh/m² in July across the year — September's 5.83 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.6Intense
26.6Intense
36.5Intense
46.5Intense
56.4Intense
66.4Intense
76.3Intense
86.2Intense
96.2Intense
106.1Intense
116.1Intense
126.0Intense
135.9Bright
145.9Bright
155.8Bright
165.8Bright
175.7Bright
185.7Bright
195.6Bright
205.5Bright
215.5Bright
225.4Bright
235.4Bright
245.3Bright
255.3Bright
265.2Bright
275.2Bright
285.1Bright
295.0Bright
305.0Bright
Planning a trip in September

Hazard calendar for Redding

In seasonPeak

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

Redding'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 Redding?

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

5.6
Sightseeing
4th-best month of the year
8.4
Beach & pool
1st-best month of the year

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

What to pack for Redding in September

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

In September, Redding sees daytime highs around 89°F and nights near 61°F. Pack light clothes. Worth having: sun protection.

light clothessun protection

UV index in Redding 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 Redding peaks around July 10 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 10UV 10Dec 15UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May9Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep6High
Oct5Moderate
Nov2Low
Dec2Low

Air quality in Redding 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 Redding is worst in August — around 76 µg/m³ PM2.5 (unhealthy), about 11.2× the cleanest month (June, 7 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecGoodUnhealthyModerateGoodAug 1973 µg/m³Dec 227 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb9Good
Mar11Good
Apr10Good
May8Good
Jun7Good
Jul39Poor
Aug76Unhealthy
Sep60Unhealthy
Oct13Moderate
Nov11Good
Dec7Good
Location & terrain

Where is Redding?

Redding sits at 40.6°N, 122.4°W, 564 ft above sea level, in United States. The nearest listed city is Chico, 66 mi away.

Topography around Redding

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

Within 2 miles, the terrain around Redding has only modest variations in elevation — a maximum elevation change of 449 ft around an average of 600 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,484 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,164 ft.

The land around Redding is covered by trees (42%) and artificial surfaces (40%) within 2 miles, trees (63%) and grassland (25%) within 10 miles, and trees (76%) and grassland (21%) within 50 miles.

2 miles
449 ft
10 miles
3,484 ft
50 miles
10,164 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Chico 66 mi · Paradise 70 mi · Oroville 86 mi · Bayside 89 mi · Arcata 91 mi · Susanville 92 mi · McKinleyville 93 mi · Eureka 94 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 Redding (40.5865°, -122.3917°, elevation 564 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).