Coos Bay climate — normals and trends

Q: What is the climate of Coos Bay?

Coos Bay has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 11.3 °C and it receives 1,371 mm of precipitation per year.

Q: What is the hottest day ever recorded in Coos Bay?

The hottest day measured in Coos Bay between 1940 and 2025 was 10 October 1991, reaching 32.8 °C.

Q: What is the coldest day in Coos Bay?

The coldest day measured in Coos Bay between 1940 and 2025 was 21 December 1990, at -12.8 °C.

Q: Does it snow in Coos Bay?

Yes. Coos Bay gets on average 7.5 cm of snow per year and has around 3 frost days.

Q: Has the climate of Coos Bay warmed?

Yes: Coos Bay warmed by +0.8 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Coos Bay?

The wettest day measured in Coos Bay between 1940 and 2025 was 18 November 1996, with 134 mm of rain in 24 hours.

Q: What was the windiest day in Coos Bay?

The windiest day measured in Coos Bay between 1940 and 2025 was 12 October 1962, with winds reaching 73.7 km/h.

Q: What is the warmest month in Coos Bay?

The warmest month in Coos Bay is August (15.7 °C on average); the coldest is January (7.6 °C).

Q: How much does it rain in Coos Bay?

Coos Bay receives on average 1,371 mm of precipitation per year, spread over about 133 rainy days.

Q: Is it sunny in Coos Bay?

Coos Bay gets on average 9.3 hours of sunshine per day, roughly 3,395 hours per year over 1940-2025.

Coos Bay (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 11.3 °C and it receives 1,371 mm of precipitation per year.

These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.

The warmest month is August (15.7 °C on average) and the coldest is January (7.6 °C). Rainfall peaks in December.

Coos Bay averages 3 frost days, 0 hot days (≥ 30 °C) and 133 rainy days per year.

Coos Bay has warmed by +0.8 °C between 1940 and 2025, or +0.09 °C per decade. This trend is statistically significant.

The number of frost days there went from about 4 to 2 per year over the period.

The hottest day of the period reached 32.8 °C (on 10 October 1991) and the coldest -12.8 °C (on 21 December 1990).

Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.

Climate normals · ERA5

Coos BayOregon

coords: 43.37°, -124.22°
period: 1940–2025 · 86 yrs

CsbWarm-summer MediterraneanWarmest monthAugustColdest monthJanuaryWettest monthDecemberDriest monthJuly

Mean daily temperature

11.3°C

Average daily high

14.7°C

Average daily low

8.6°C

Annual rainfall

1,371mm

Sunshine / day

9.3h

Mean relative humidity

80%

Average peak wind

21.6km/h

Seasonal range

8.1°C

Frost days (< 0 °C)

3 d/yr

Hot days (≥ 30 °C)

0 d/yr

Rainy days (≥ 1 mm)

133 d/yr

Annual snowfall

7.5 cm

Average feels-like high

12.5 °C

Average feels-like low

5.8 °C

Average peak gust

42.0 km/h

Tropical nights (≥ 20 °C)

0 d/yr

Solar radiation

15.0 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+0.8 °C

since 1940

+0.1 °C per decade · r² = 0.18 · p = < 0.001

19402025

Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).

A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.

Records for the period

Hottest day

32.8 °C

10 October 1991

Coldest day

-12.8 °C

21 December 1990

Wettest day

134 mm

18 November 1996

Windiest day

73.7 km/h

12 October 1962

Strongest gust

141.8 km/h

6 December 1952

Hottest feels-like

32.5 °C

11 July 1961

Coldest feels-like

-19.6 °C

21 December 1990

Snowiest day

13.4 cm

1 January 2004

Sunniest day

14.9 h

6 July 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	27.1 °C10 August 2025	-0.7 °C12 February 2025	11.8 °C	1,150 mm	0	2
2024	27.7 °C5 July 2024	1.8 °C2 March 2024	11.9 °C	1,753 mm	0	0
2023	29.4 °C14 May 2023	-1.3 °C24 February 2023	11.6 °C	1,429 mm	0	5
2022	28.7 °C9 September 2022	-1.3 °C23 February 2022	11.5 °C	1,110 mm	0	2
2021	26.2 °C27 June 2021	1.1 °C27 December 2021	11.5 °C	1,322 mm	0	0
2020	30.4 °C28 September 2020	1.7 °C4 February 2020	11.9 °C	1,054 mm	1	0
2019	25.8 °C9 May 2019	-0.8 °C26 February 2019	11.6 °C	1,208 mm	0	1
2018	25.0 °C21 August 2018	-0.9 °C23 February 2018	11.7 °C	1,037 mm	0	1
2017	28.8 °C2 August 2017	-1.4 °C5 January 2017	11.5 °C	1,570 mm	0	2
2016	27.8 °C25 August 2016	0.4 °C17 December 2016	12.5 °C	1,594 mm	0	0
2015	28.0 °C29 July 2015	0.7 °C29 November 2015	12.5 °C	1,209 mm	0	0
2014	29.4 °C5 September 2014	0.9 °C30 December 2014	12.9 °C	1,358 mm	0	0
2013	26.5 °C10 September 2013	-5.2 °C8 December 2013	11.2 °C	655 mm	0	7
2012	24.2 °C12 September 2012	0.7 °C16 January 2012	11.2 °C	1,849 mm	0	0
2011	26.5 °C3 September 2011	-1.9 °C26 February 2011	11.0 °C	1,133 mm	0	3
2010	26.4 °C24 August 2010	0.8 °C24 November 2010	11.5 °C	1,553 mm	0	0
2009	30.8 °C21 September 2009	-4.4 °C9 December 2009	11.1 °C	936 mm	1	5
2008	26.4 °C16 May 2008	-2.0 °C17 December 2008	10.7 °C	1,140 mm	0	2
2007	27.9 °C9 September 2007	-1.9 °C13 January 2007	11.1 °C	1,206 mm	0	4
2006	25.0 °C20 July 2006	-0.5 °C16 February 2006	11.4 °C	1,633 mm	0	3
2005	25.9 °C17 July 2005	0.0 °C16 December 2005	11.7 °C	1,296 mm	0	0
2004	29.4 °C8 August 2004	1.7 °C1 January 2004	12.2 °C	1,183 mm	0	0
2003	28.3 °C28 June 2003	1.1 °C22 November 2003	11.9 °C	1,257 mm	0	0
2002	30.6 °C13 August 2002	0.4 °C29 January 2002	11.3 °C	1,249 mm	1	0
2001	26.7 °C8 September 2001	1.4 °C12 February 2001	11.2 °C	1,064 mm	0	0
2000	28.2 °C13 September 2000	1.5 °C12 November 2000	11.4 °C	1,151 mm	0	0
1999	28.4 °C12 September 1999	1.6 °C5 March 1999	11.0 °C	1,517 mm	0	0
1998	26.1 °C31 August 1998	-5.2 °C21 December 1998	11.6 °C	1,792 mm	0	4
1997	25.1 °C20 September 1997	0.6 °C14 January 1997	12.4 °C	1,222 mm	0	0
1996	26.5 °C8 October 1996	1.6 °C24 February 1996	11.7 °C	2,048 mm	0	0
1995	29.2 °C21 September 1995	0.8 °C14 February 1995	12.4 °C	1,695 mm	0	0
1994	29.6 °C21 September 1994	1.1 °C8 February 1994	11.6 °C	1,219 mm	0	0
1993	28.0 °C1 August 1993	-0.9 °C16 February 1993	11.4 °C	1,338 mm	0	2
1992	29.2 °C22 June 1992	2.5 °C4 December 1992	12.4 °C	1,100 mm	0	0
1991	32.8 °C10 October 1991	-0.1 °C29 January 1991	11.3 °C	943 mm	1	1
1990	31.1 °C21 September 1990	-12.8 °C21 December 1990	11.3 °C	1,167 mm	1	11
1989	28.1 °C24 June 1989	-9.0 °C5 February 1989	11.2 °C	962 mm	0	8
1988	27.8 °C25 July 1988	-0.8 °C2 February 1988	11.2 °C	1,143 mm	0	1
1987	28.4 °C30 August 1987	-0.2 °C16 January 1987	11.6 °C	1,342 mm	0	1
1986	24.7 °C10 June 1986	1.5 °C9 February 1986	11.6 °C	1,316 mm	0	0
1985	28.5 °C25 September 1985	-0.8 °C25 November 1985	10.5 °C	799 mm	0	5
1984	24.5 °C7 August 1984	-0.7 °C20 December 1984	11.1 °C	1,473 mm	0	3
1983	25.4 °C20 September 1983	-5.6 °C23 December 1983	11.9 °C	1,969 mm	0	4
1982	27.2 °C1 September 1982	-1.7 °C6 January 1982	10.8 °C	1,585 mm	0	3
1981	28.8 °C6 September 1981	2.1 °C30 December 1981	11.6 °C	1,401 mm	0	0
1980	26.7 °C2 October 1980	-4.5 °C29 January 1980	11.2 °C	1,302 mm	0	4
1979	28.1 °C12 September 1979	-1.6 °C1 January 1979	11.6 °C	1,354 mm	0	5
1978	28.8 °C21 July 1978	-4.0 °C30 December 1978	11.4 °C	1,198 mm	0	8
1977	25.9 °C10 August 1977	-0.9 °C20 November 1977	11.0 °C	1,368 mm	0	3
1976	24.8 °C7 October 1976	-0.9 °C5 February 1976	10.9 °C	898 mm	0	1
1975	27.1 °C4 September 1975	0.5 °C21 February 1975	10.8 °C	1,516 mm	0	0
1974	29.5 °C13 September 1974	-2.7 °C9 January 1974	11.1 °C	1,386 mm	0	9
1973	28.3 °C4 September 1973	0.2 °C7 January 1973	11.2 °C	1,640 mm	0	0
1972	26.0 °C17 July 1972	-11.4 °C8 December 1972	10.7 °C	1,353 mm	0	14
1971	27.9 °C18 September 1971	-3.6 °C1 March 1971	10.4 °C	1,707 mm	0	3
1970	26.3 °C31 May 1970	0.7 °C5 January 1970	11.1 °C	1,610 mm	0	0
1969	25.2 °C7 May 1969	-2.5 °C28 January 1969	11.0 °C	1,286 mm	0	4
1968	27.8 °C30 August 1968	-1.2 °C27 January 1968	11.6 °C	1,711 mm	0	1
1967	27.3 °C13 September 1967	-0.1 °C13 December 1967	11.3 °C	1,427 mm	0	1
1966	28.8 °C20 August 1966	0.7 °C21 January 1966	11.4 °C	1,402 mm	0	0
1965	27.5 °C23 September 1965	-0.5 °C16 December 1965	11.2 °C	1,248 mm	0	2
1964	26.8 °C24 September 1964	-0.9 °C17 December 1964	10.9 °C	1,630 mm	0	2
1963	26.1 °C3 September 1963	-3.6 °C12 January 1963	11.4 °C	1,445 mm	0	7
1962	25.6 °C16 September 1962	-6.6 °C21 January 1962	11.1 °C	1,282 mm	0	9
1961	29.6 °C11 July 1961	-2.0 °C11 December 1961	11.4 °C	1,721 mm	0	2
1960	27.0 °C8 September 1960	-1.4 °C27 February 1960	11.2 °C	1,615 mm	0	3
1959	25.7 °C6 August 1959	-0.2 °C3 January 1959	11.6 °C	1,267 mm	0	1
1958	29.4 °C6 September 1958	0.8 °C16 November 1958	12.7 °C	1,457 mm	0	0
1957	28.4 °C10 September 1957	-6.0 °C26 January 1957	11.6 °C	1,497 mm	0	6
1956	31.3 °C18 July 1956	-3.5 °C16 February 1956	10.9 °C	1,511 mm	1	4
1955	27.4 °C4 September 1955	-6.1 °C15 November 1955	10.4 °C	1,580 mm	0	3
1954	24.7 °C28 July 1954	-0.4 °C20 January 1954	11.3 °C	1,515 mm	0	1
1953	28.2 °C3 September 1953	1.7 °C1 March 1953	11.6 °C	2,013 mm	0	0
1952	28.6 °C7 July 1952	-0.7 °C2 January 1952	10.8 °C	1,417 mm	0	2
1951	27.7 °C11 July 1951	-2.3 °C29 January 1951	11.1 °C	1,780 mm	0	3
1950	26.5 °C31 August 1950	-11.1 °C31 January 1950	11.0 °C	1,822 mm	0	13
1949	26.8 °C26 September 1949	-3.3 °C11 January 1949	10.7 °C	1,239 mm	0	12
1948	29.4 °C8 September 1948	-0.9 °C3 February 1948	10.4 °C	1,697 mm	0	5
1947	28.0 °C22 September 1947	-2.5 °C15 January 1947	11.1 °C	1,410 mm	0	4
1946	28.9 °C19 July 1946	-2.1 °C3 February 1946	10.4 °C	1,323 mm	0	3
1945	27.2 °C18 June 1945	0.7 °C13 December 1945	10.9 °C	1,556 mm	0	0
1944	27.8 °C29 August 1944	1.2 °C30 December 1944	10.8 °C	1,070 mm	0	0
1943	28.2 °C23 September 1943	-5.9 °C24 January 1943	11.1 °C	865 mm	0	5
1942	27.6 °C29 June 1942	-3.4 °C1 January 1942	11.1 °C	1,220 mm	0	4
1941	25.6 °C13 July 1941	0.5 °C26 December 1941	11.8 °C	1,164 mm	0	0
1940	27.2 °C5 August 1940	1.1 °C14 December 1940	11.7 °C	1,267 mm	0	0

Normals computed over complete calendar years 1940–2025.

A specific year

Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?

Year

Across the whole year

Average daily high

15.0 °C

+0.3 °C

Hot days (≥ 30 °C)

0 d/yr

Frost days (< 0 °C)

2 d/yr

-1

Annual rainfall

1150 mm

-222 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	11.1 °C	+0.8 °C	131 mm	-86 mm
Feb	10.1 °C	-1.0 °C	181 mm	+8 mm
Mar	11.6 °C	-0.1 °C	325 mm	+147 mm
Apr	14.0 °C	+1.0 °C	59 mm	-49 mm
May	15.4 °C	+0.2 °C	33 mm	-32 mm
Jun	17.2 °C	-0.2 °C	9 mm	-21 mm
Jul	19.0 °C	-0.6 °C	1 mm	-5 mm
Aug	20.3 °C	+0.4 °C	4 mm	-9 mm
Sep	19.1 °C	-0.3 °C	39 mm	+7 mm
Oct	15.9 °C	-0.3 °C	79 mm	-21 mm
Nov	13.8 °C	+1.3 °C	133 mm	-76 mm
Dec	12.3 °C	+1.9 °C	155 mm	-84 mm

The year's extremes

Hottest day

27.1 °C

10 Aug 2025

Coldest day

-0.7 °C

12 Feb 2025

Wettest day

65.1 mm

16 Mar 2025

Windiest day

47.7 km/h

18 Dec 2025

Strongest gust

102.6 km/h

24 Feb 2025

Hottest feels-like

27.4 °C

10 Aug 2025

Coldest feels-like

-5.3 °C

12 Feb 2025

Snowiest day

0.1 cm

4 Feb 2025

Sunniest day

14.9 h

6 Jul 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Coos Bay?

Coos Bay has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 11.3 °C and it receives 1,371 mm of precipitation per year.

What is the hottest day ever recorded in Coos Bay?

The hottest day measured in Coos Bay between 1940 and 2025 was 10 October 1991, reaching 32.8 °C.

What is the coldest day in Coos Bay?

The coldest day measured in Coos Bay between 1940 and 2025 was 21 December 1990, at -12.8 °C.

Does it snow in Coos Bay?

Yes. Coos Bay gets on average 7.5 cm of snow per year and has around 3 frost days.

Has the climate of Coos Bay warmed?

Yes: Coos Bay warmed by +0.8 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Coos Bay?

The wettest day measured in Coos Bay between 1940 and 2025 was 18 November 1996, with 134 mm of rain in 24 hours.

What was the windiest day in Coos Bay?

The windiest day measured in Coos Bay between 1940 and 2025 was 12 October 1962, with winds reaching 73.7 km/h.

What is the warmest month in Coos Bay?

The warmest month in Coos Bay is August (15.7 °C on average); the coldest is January (7.6 °C).

How much does it rain in Coos Bay?

Coos Bay receives on average 1,371 mm of precipitation per year, spread over about 133 rainy days.

Is it sunny in Coos Bay?

Coos Bay gets on average 9.3 hours of sunshine per day, roughly 3,395 hours per year over 1940-2025.

What is the biggest single-day snowfall in Coos Bay?

The heaviest 24-hour snowfall measured in Coos Bay between 1940 and 2025 was 1 January 2004, with 13.4 cm.

Are there tropical nights in Coos Bay?

Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Coos Bay.

What was the most extreme apparent temperature in Coos Bay?

In Coos Bay, between 1940 and 2025, the highest apparent temperature reached 32.5 °C on 11 July 1961, and the lowest was -19.6 °C on 21 December 1990.

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