Centralia weather in September

In September, Centralia sees average daytime highs of 70°F and overnight lows near 50°F, with 2.1 in of rain across 7.5 wet days and about 12.4 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 73°F in the first days to 66°F by the end. The sky is clear or mostly clear about 40% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 12 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Centralia's 3rd-clearest and 12th-windiest month. For the whole year in context, see Centralia's year-round climate.

Daytime high
70°
3rd warmest
Overnight low
50°
10th coldest
Rainfall
2.1 in
7.5 wet days
Daylight
12 h 18 min
5:56 AM – 6:16 PM
Cloud cover
48%
3rd clearest
Wind
4 mph
12th windiest
Solar energy
4.14 kWh/m²
Travel score
7.0
out of 10

Centralia is city in Lewis County, Washington, United States.

Density
856/km²
people per km²
Founded
1852

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 73°F in the first days to 66°F by the end.

A typical September day in Centralia reaches about 70°F in the afternoon and slips back to 50°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 61°F and 80°F. Set against its neighbours, September runs about 6°F cooler than August and about 11°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17452
27352
37352
47352
57352
67351
77351
87251
97251
107251
117151
127151
137150
147150
157050
167050
177050
186950
196949
206949
216949
226849
236849
246848
256748
266748
276748
286647
296647
306647

How September really feels in Centralia

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

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Centralia weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan46° / 36°7.3182.48.80.9
Feb49° / 36°5.314.82.1101.6
Mar53° / 38°6.218.21.411.62.4
Apr58° / 41°4.816.30.113.33.5
May64° / 46°3.111.5014.85.4
Jun68° / 50°2.08.4015.66.5
Jul75° / 53°0.63.7015.38.1
Aug76° / 53°1.04.10148.1
Sep70° / 50°2.17.5012.47.0
Oct59° / 44°5.013010.64.4
Nov50° / 38°8.218.20.89.21.8
Dec45° / 35°7.817.72.78.40.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 44%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25941
35941
45941
55941
65941
75941
85941
95842
105743
115644
125545
135446
145545
155446
165446
175446
185446
195545
205545
215446
225545
235545
245644
255644
265644
275743
285743
295545
305446

Chance of precipitation in September

Any precipitation

Centralia gets around 2.1 in of rain over 7.5 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 25% and peaks near 30% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
121
221
322
422
522
623
723
824
924
1025
1125
1225
1326
1425
1525
1625
1725
1825
1925
2026
2126
2226
2326
2426
2527
2627
2727
2828
2929
3030

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 84% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
179201
279201
379201
479201
580191
680191
780191
881181
981181
1081181
1181181
1281181
1381181
1481181
1582171
1682171
1782171
1883161
1983161
2084151
2185141
2285141
2387130
2488120
2589110
2690100
2790100
289190
299280
309370

Wind in September

Winds average 4 mph in September, the calmest month.

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
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 12 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 102 minutes over September. Sunrise moves from 5:36 AM to 6:15 AM, and sunset from 6:47 PM to 5:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.25:366:47
213.15:386:45
313.15:396:43
413.05:406:41
513.05:426:39
612.95:436:37
712.85:446:35
812.85:466:33
912.75:476:30
1012.75:486:28
1112.65:506:26
1212.65:516:24
1312.55:526:22
1412.45:546:20
1512.45:556:18
1612.35:566:16
1712.35:586:14
1812.25:596:12
1912.26:006:10
2012.16:026:08
2112.06:036:06
2212.06:046:03
2311.96:066:01
2411.96:075:59
2511.86:085:57
2611.86:105:55
2711.76:115:53
2811.66:135:51
2911.66:145:49
3011.56:155:47

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.14 kWh/m².

For context, solar energy here swings from a low near 0.92 kWh/m² to a high of 6.31 kWh/m² in July across the year — September's 4.14 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.7Bright
44.7Bright
54.6Bright
64.6Bright
74.5Bright
84.5Bright
94.5Bright
104.4Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.1Bright
164.1Bright
174.0Bright
184.0Moderate
193.9Moderate
203.8Moderate
213.8Moderate
223.7Moderate
233.7Moderate
243.6Moderate
253.6Moderate
263.5Moderate
273.5Moderate
283.4Moderate
293.4Moderate
303.3Moderate
Planning a trip in September

Hazard calendar for Centralia

In seasonPeak

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

Centralia's rainy season runs October–April, 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 Centralia?

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

7.0
Sightseeing
3rd-best month of the year
4.3
Beach & pool
3rd-best month of the year

September is one of the better times to visit Centralia for general sightseeing.

What to pack for Centralia in September

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

In September, Centralia sees daytime highs around 70°F and nights near 50°F. Little to plan around — just the basics. About 8 days see rain.

UV index in Centralia in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Centralia peaks around July 17 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 17UV 8Dec 17UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5Moderate
May8Very high
Jun6High
Jul8Very high
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Centralia 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 Centralia is worst in September — around 20 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (December, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1519 µg/m³Dec 237 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar11Good
Apr11Good
May10Good
Jun10Good
Jul9Good
Aug15Moderate
Sep20Moderate
Oct13Moderate
Nov9Good
Dec7Good
Location & terrain

Where is Centralia?

Centralia sits at 46.7°N, 123.0°W, 187 ft above sea level, in United States. The nearest listed city is Tumwater, 21 mi away.

Topography around Centralia

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

Within 2 miles, the terrain around Centralia has only modest variations in elevation — a maximum elevation change of 535 ft around an average of 253 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,368 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,208 ft.

The land around Centralia is covered by trees (50%) and grassland (30%) within 2 miles, trees (63%) and grassland (33%) within 10 miles, and trees (82%) within 50 miles.

2 miles
535 ft
10 miles
1,368 ft
50 miles
7,208 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Tumwater 21 mi · Lacey 23 mi · Olympia 23 mi · Spanaway 36 mi · Lakewood 38 mi · Frederickson 39 mi · Graham 39 mi · Parkland 39 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 Centralia (46.7162°, -122.9543°, elevation 187 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).