Coos Bay weather in December

In December, Coos Bay sees average daytime highs of 51°F and overnight lows near 43°F, with 9.5 in of precipitation across 17.6 wet days and about 8.8 hours of daylight. It is the 12th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 51°F through the month. The sky is clear or mostly clear about 17% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 hours at the start of December to 8 h 48 min by month's end. Set against the rest of the year, December is Coos Bay's 12th-clearest and 1st-windiest month. For the whole year in context, see Coos Bay's year-round climate.

Daytime high
51°
12th warmest
Overnight low
43°
1st coldest
Precipitation
9.5 in
17.6 wet days
Daylight
8 h 48 min
7:49 AM – 4:37 PM
Cloud cover
73%
12th clearest
Wind
10 mph
1st windiest
Solar energy
1.32 kWh/m²
Travel score
2.0
out of 10

Coos Bay is city in Coos County, Oregon, United States.

Density
393/km²
people per km²
Founded
1853

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 51°F through the month.

A typical December day in Coos Bay reaches about 51°F in the afternoon and slips back to 43°F overnight — a 8°F spread between the day's warmth and the night's chill. On most days the high lands between 45°F and 56°F. Set against its neighbours, December runs about 4°F cooler than November and on par with January.

30°40°50°60°151015202531
Avg high (°F)Avg low (°F)
15244
25243
35243
45143
55143
65143
75143
85143
95143
105143
115143
125143
135143
145143
155143
165142
175142
185142
195042
205042
215042
225042
235042
245042
255042
265042
275042
285042
295042
305042
315042

Coos Bay weather by month

How December compares with the rest of the year at a glance. December is the 12th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan51° / 43°8.117.30.49.22.1
Feb52° / 43°6.214.80.510.22.4
Mar53° / 44°6.616.80.411.62.6
Apr56° / 45°4.614.80.113.23.3
May60° / 49°2.59.5014.54.8
Jun63° / 52°1.35.9015.26.3
Jul67° / 54°0.21.4014.98.0
Aug68° / 55°0.41.9013.88.0
Sep67° / 53°1.14.2012.37.4
Oct61° / 50°3.59.4010.85.4
Nov55° / 46°7.616.80.19.52.9
Dec51° / 43°9.517.60.28.82.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 9% of December, with mostly cloudy or overcast conditions the remaining 74%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13169
23070
33070
43070
52971
62872
72872
82674
92674
102674
112476
122476
132476
142377
152278
162278
172377
182377
192476
202476
212575
222575
232674
242773
252773
262773
272773
282773
292773
302773
312773

Chance of precipitation in December

Any precipitation

Coos Bay gets around 9.5 in of rain and snow over 17.6 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 58% and peaks near 60% on the wettest days, and about 0 day brings snow.

0%20%40%60%151015202531
Rain chance (%)
158
258
358
458
558
658
758
859
959
1059
1159
1259
1360
1460
1560
1660
1759
1859
1959
2058
2157
2257
2356
2456
2555
2655
2755
2855
2955
3055
3156

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in December

Winds average 10 mph in December, the windiest month of the year.

Across December, daily wind ranges from about 10 mph on the calmest days to 10 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
110light breeze
210light breeze
310light breeze
410light breeze
510light breeze
610light breeze
710light breeze
810light breeze
910light breeze
1010light breeze
1110light breeze
1210light breeze
1310light breeze
1410light breeze
1510light breeze
1610light breeze
1710light breeze
1810light breeze
1910light breeze
2010light breeze
2110light breeze
2210light breeze
2310light breeze
2410light breeze
2510light breeze
2610light breeze
2710light breeze
2810light breeze
2910light breeze
3010light breeze
3110light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 hours at the start of December to 8 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:36 AM to 7:55 AM, and sunset from 4:37 PM to 4:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.07:364:37
29.07:374:37
39.07:384:37
49.07:394:37
58.97:404:36
68.97:414:36
78.97:424:36
88.97:434:36
98.97:444:36
108.97:454:36
118.87:454:36
128.87:464:36
138.87:474:36
148.87:484:37
158.87:484:37
168.87:494:37
178.87:504:37
188.87:504:38
198.87:514:38
208.87:524:38
218.87:524:39
228.87:534:39
238.87:534:40
248.87:534:40
258.87:544:41
268.87:544:41
278.87:544:42
288.87:554:43
298.87:554:43
308.87:554:44
318.87:554:45

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.32 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.32 kWh/m² to a high of 7.22 kWh/m² in July across the year — December's 1.32 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
11.4Dim
21.4Dim
31.4Dim
41.4Dim
51.4Dim
61.4Dim
71.3Dim
81.3Dim
91.3Dim
101.3Dim
111.3Dim
121.3Dim
131.3Dim
141.3Dim
151.3Dim
161.3Dim
171.3Dim
181.3Dim
191.3Dim
201.3Dim
211.3Dim
221.3Dim
231.3Dim
241.3Dim
251.3Dim
261.3Dim
271.3Dim
281.4Dim
291.4Dim
301.4Dim
311.4Dim
Planning a trip in December

Hazard calendar for Coos Bay

In seasonPeak

In December, Coos Bay sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Coos Bay's rainy season runs November–April, when most of the year's rain falls.

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

Is December a good time to visit Coos Bay?

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

2.0
Sightseeing
12th-best month of the year
0.0
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Coos Bay.

What to pack for Coos Bay in December

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

In December, Coos Bay sees daytime highs around 51°F and nights near 43°F. Pack a warm layer and rain gear. About 18 days see rain.

a warm layerrain gear

Sea temperature near Coos Bay in December

The nearest coast averages about 52°F in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 8 mi away) is warmest in September at about 56°F and coldest in February near 51°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

50°52°54°56°58°JanFebMarAprMayJunJulAugSepOctNovDecbracing
Sea temperature (°F)Comfort
Jan51Bracing
Feb51Bracing
Mar51Bracing
Apr52Bracing
May53Bracing
Jun55Bracing
Jul55Bracing
Aug56Bracing
Sep56Bracing
Oct55Bracing
Nov53Bracing
Dec52Bracing

UV index in Coos Bay in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Coos Bay peaks around July 15 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 15UV 8Dec 17UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr5High
May9Very high
Jun8Very high
Jul9Very high
Aug7Very high
Sep5Moderate
Oct4Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Coos Bay?

Coos Bay sits at 43.4°N, 124.2°W, 23 ft above sea level, in United States. The nearest listed city is Roseburg, 45 mi away.

Topography around Coos Bay

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

Within 2 miles, the terrain around Coos Bay has only modest variations in elevation — a maximum elevation change of 600 ft around an average of 112 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,742 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,088 ft.

The land around Coos Bay is covered by trees (54%) and water (20%) within 2 miles, trees (65%) and water (23%) within 10 miles, and trees (64%) and water (27%) within 50 miles.

2 miles
600 ft
10 miles
1,742 ft
50 miles
4,088 ft
treesgrasslandartificial surfacesbare terrainwaterwetland
December weather nearby: Roseburg 45 mi · Eugene 74 mi · Springfield 76 mi · Grants Pass 78 mi · Central Point 95 mi · Corvallis 96 mi · Medford 99 mi · Albany 104 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 Coos Bay (43.3665°, -124.2179°, elevation 23 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).