Frederickson weather in September

In September, Frederickson sees average daytime highs of 67°F and overnight lows near 48°F, with 2.8 in of rain across 7.7 wet days and about 12.4 hours of daylight. It is the 3rd-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 70°F in the first days to 64°F by the end. The sky is clear or mostly clear about 42% 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 Frederickson's 3rd-clearest and 10th-windiest month. For the whole year in context, see Frederickson's year-round climate.

Daytime high
67°
3rd warmest
Overnight low
48°
9th coldest
Rainfall
2.8 in
7.7 wet days
Daylight
12 h 18 min
5:54 AM – 6:14 PM
Cloud cover
47%
3rd clearest
Wind
4 mph
10th windiest
Solar energy
4.15 kWh/m²
Travel score
6.7
out of 10

Frederickson is census designated place in Pierce County, Washington, United States.

Density
625/km²
people per km²

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 70°F in the first days to 64°F by the end.

A typical September day in Frederickson reaches about 67°F in the afternoon and slips back to 48°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 58°F and 78°F. Set against its neighbours, September runs about 6°F cooler than August and about 10°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17150
27050
37050
47050
57049
66949
76949
86949
96949
106949
116849
126849
136848
146848
156748
166748
176748
186747
196647
206647
216647
226547
236546
246546
256546
266446
276446
286446
296345
306345

How September really feels in Frederickson

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.

Frederickson weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan44° / 34°8.318.56.38.70.6
Feb46° / 34°6.115.75.2101.1
Mar50° / 35°6.9195.711.61.8
Apr55° / 39°5.416.92.313.32.9
May61° / 44°3.8130.214.84.7
Jun65° / 48°2.910.1015.65.9
Jul72° / 52°1.04.8015.37.8
Aug73° / 52°1.24.60148.0
Sep67° / 48°2.87.7012.46.7
Oct57° / 42°5.813.90.110.63.8
Nov48° / 37°9.018.72.99.11.3
Dec43° / 33°8.5186.88.40.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% 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 43%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16040
26040
36139
46139
56139
66139
76139
86040
95941
105842
115842
125743
135743
145644
155644
165644
175644
185644
195545
205545
215545
225545
235545
245545
255644
265644
275644
285545
295446
305347

Chance of precipitation in September

Any precipitation

Frederickson gets around 2.8 in of rain over 7.7 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 26% and peaks near 32% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
122
222
323
423
523
623
723
824
924
1024
1125
1225
1325
1426
1526
1626
1726
1826
1927
2027
2127
2228
2328
2429
2529
2629
2730
2830
2931
3032

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 91% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
187130
288120
388120
487121
588111
689110
789110
890100
990100
1090100
1190100
1290100
1390100
1490100
1590100
1690100
179190
189190
199280
209280
219370
229370
239460
249550
259550
269640
279730
289730
299730
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 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 5:33 AM to 6:13 AM, and sunset from 6:45 PM to 5:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.25:336:45
213.15:356:43
313.15:366:41
413.05:386:39
513.05:396:37
612.95:406:35
712.85:426:33
812.85:436:30
912.75:446:28
1012.75:466:26
1112.65:476:24
1212.65:486:22
1312.55:506:20
1412.45:516:18
1512.45:526:16
1612.35:546:14
1712.35:556:12
1812.25:576:10
1912.25:586:07
2012.15:596:05
2112.06:016:03
2212.06:026:01
2311.96:035:59
2411.96:055:57
2511.86:065:55
2611.86:075:53
2711.76:095:51
2811.66:105:49
2911.66:125:47
3011.56:135:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.15 kWh/m².

For context, solar energy here swings from a low near 0.93 kWh/m² to a high of 6.37 kWh/m² in July across the year — September's 4.15 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.7Bright
54.7Bright
64.6Bright
74.6Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.3Bright
134.3Bright
144.2Bright
154.1Bright
164.1Bright
174.0Bright
184.0Moderate
193.9Moderate
203.9Moderate
213.8Moderate
223.8Moderate
233.7Moderate
243.6Moderate
253.6Moderate
263.5Moderate
273.5Moderate
283.4Moderate
293.4Moderate
303.3Moderate
Planning a trip in September

Hazard calendar for Frederickson

In seasonPeak

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

Frederickson'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 Frederickson?

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

6.7
Sightseeing
3rd-best month of the year
3.2
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Frederickson for sightseeing.

What to pack for Frederickson in September

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

In September, Frederickson sees daytime highs around 67°F and nights near 48°F. Little to plan around — just the basics. About 8 days see rain.

UV index in Frederickson 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 Frederickson peaks around July 17 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 18 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 18UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar4Moderate
Apr5Moderate
May7Very high
Jun6High
Jul8Very high
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Frederickson 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 Frederickson is worst in September — around 22 µg/m³ PM2.5 (moderate), about 3.4× the cleanest month (December, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodGoodModerateGoodSep 1322 µg/m³Dec 177 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar12Moderate
Apr12Good
May11Good
Jun10Good
Jul10Good
Aug18Moderate
Sep22Moderate
Oct12Good
Nov8Good
Dec7Good
Location & terrain

Where is Frederickson?

Frederickson sits at 47.1°N, 122.4°W, 400 ft above sea level, in United States. The nearest listed city is Spanaway, 3.7 mi away.

Topography around Frederickson

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

Within 2 miles, the terrain around Frederickson has only modest variations in elevation — a maximum elevation change of 253 ft around an average of 423 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,509 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 14,403 ft.

The land around Frederickson is covered by trees (50%), artificial surfaces (24%) and grassland (22%) within 2 miles, trees (60%) and grassland (23%) within 10 miles, and trees (79%) within 50 miles.

2 miles
253 ft
10 miles
1,509 ft
50 miles
14,403 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Spanaway 3.7 mi · Graham 4.3 mi · South Hill 5.0 mi · Parkland 5.6 mi · Puyallup 6.8 mi · Lakewood 9.3 mi · Bonney Lake 9.9 mi · Tacoma 12 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 Frederickson (47.0962°, -122.3587°, elevation 400 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).