United States · 1991–2020

Best time to visit
Blue Lake.

August leads for comfortable weather in Blue Lake: typically 17.8°C by day, 10.6°C at night, with 5 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high17.8°C

Typical low10.6°C

Rain in August5 mm

Comfort

August

August · July · September

72climate match

Beach

August

August · July · September

37climate match

Outdoors

September

September · August · July

93climate match

The weakest month is December, scoring 7 against August’s 72 — days reach only 13.1°C, 11° below the 24°C the score treats as ideal, and 225 mm of rain falls.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

1513.3° / 4.6°

Feb

1713.2° / 4.4°

Mar

1813.5° / 4.9°

Apr

3414.1° / 5.8°

May

5315.3° / 7.7°

Jun

6616.8° / 9°

Jul

7017.4° / 10.6°

Aug

7217.8° / 10.6°

Sep

7018.2° / 9°

Oct

5517.2° / 7.1°

Nov

2814.7° / 5.5°

Dec

713.1° / 4.2°

Monthly climate evidence for Blue Lake — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 12 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	13.3°C	4.6°C	181 mm	14.2	11.0°C	9 h 32	15	Good coverage
February	13.2°C	4.4°C	172 mm	13.4	10.9°C	10 h 34	17	Good coverage
March	13.5°C	4.9°C	170 mm	14	10.8°C	11 h 49	18	Good coverage
April	14.1°C	5.8°C	103 mm	10.9	11.0°C	13 h 14	34	Good coverage
May	15.3°C	7.7°C	51 mm	6.6	11.3°C	14 h 26	53	Good coverage
June	16.8°C	9°C	22 mm	3	11.7°C	15 h 05	66	Good coverage
July	17.4°C	10.6°C	4 mm	0.5	12.3°C	14 h 50	70	Good coverage
August	17.8°C	10.6°C	5 mm	0.8	12.9°C	13 h 48	72	Good coverage
September	18.2°C	9°C	23 mm	2.3	12.8°C	12 h 25	70	Good coverage
October	17.2°C	7.1°C	76 mm	6.3	12.0°C	11 h 02	55	Good coverage
November	14.7°C	5.5°C	152 mm	12.1	11.7°C	9 h 50	28	Good coverage
December	13.1°C	4.2°C	225 mm	15.1	11.4°C	9 h 15	7	Good coverage

Records at ARCATA EUREKA AP, 1992–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	24.4°C22 Jan 2022	-4.9°C14 Jan 2007	79 mm13 Jan 2024	339 mm2024 · driest 53 mm in 2015	34
February	26.7°C8 Feb 2016	-3.8°C26 Feb 2011	69 mm19 Feb 2002	409 mm2019 · driest 11 mm in 2022	34
March	24.4°C31 Mar 2000	-2.7°C16 Mar 2021	71 mm9 Mar 2014	321 mm2012 · driest 12 mm in 2026	34
April	26.1°C1 Apr 2000	-1.6°C4 Apr 2009	49 mm27 Apr 2010	328 mm2003 · driest 17 mm in 2021	35
May	34.4°C15 May 2008	-1.1°C9 May 1999	50 mm4 May 2009	144 mm2020 · driest 3 mm in 2015	35
June	28.9°C11 Jun 2019	2.2°C8 Jun 1999	36 mm2 Jun 2010	104 mm2005 · driest 0 mm in 2019	35
July	27.8°C8 Jul 2008	5.6°C1 Jul 2010	18 mm17 Jul 2007	22 mm2007 · driest 0 mm in 2013	35
August	27.2°C15 Aug 2020	3.3°C26 Aug 1995	34 mm23 Aug 2024	40 mm2024 · driest 0 mm in 2022	34
September	35.6°C2 Sep 2017	2.8°C21 Sep 1993	67 mm24 Sep 2014	111 mm2013 · driest 0 mm in 2016	34
October	32.8°C25 Oct 2003	-1.7°C31 Oct 2002	68 mm19 Oct 2007	306 mm2016 · driest 2 mm in 2013	34
November	26.1°C26 Nov 2002	-2.8°C28 Nov 2004	120 mm21 Nov 1998	421 mm1998 · driest 43 mm in 2013	34
December	23.3°C22 Dec 1999	-5.6°C17 Dec 2005	160 mm27 Dec 2002	584 mm2002 · driest 25 mm in 2013	33

Typical days per month at ARCATA EUREKA AP, 1991–2020
Month	Days 25°C+	Frost nights	Heavy rain (10 mm+)
January	0	4	6
February	<1	4	6
March	0	2	6
April	<1	<1	4
May	<1	<1	2
June	<1	0	<1
July	<1	0	<1
August	<1	0	<1
September	1	0	<1
October	1	<1	3
November	<1	2	5
December	0	6	7

How often, not how much — every day in ARCATA EUREKA AP’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	4%	45%	20%	60%	11.4–14.8°C
February	2%	46%	22%	62%	11.2–15.0°C
March	2%	44%	20%	57%	11.7–14.8°C
April	3%	35%	11%	45%	12.4–15.5°C
May	3%	20%	5%	20%	13.9–16.5°C
June	7%	10%	2%	8%	16.0–17.7°C
July	9%	2%	<1%	<1%	15.8–18.7°C
August	18%	3%	<1%	2%	16.2–19.3°C
September	23%	9%	2%	9%	16.7–20.3°C
October	16%	21%	9%	25%	15.7–18.6°C
November	4%	40%	18%	57%	13.4–16.3°C
December	1%	49%	25%	67%	11.1–14.9°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1993Each stripe is one year’s mean temperature against the 32-year average. Warmest: 2014. Coolest: 2008.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5560020
NOAA station: USW00024283 · ARCATA EUREKA AP
Station distance: 14.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 40.88°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 12 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from ARCATA EUREKA AP is what differs

McKinleyville→Westhaven-Moonstone→Fieldbrook→Trinidad→Big Lagoon→Alliance→

Or put two places side by side: Blue Lake vs McKinleyville

Best time to visitBlue Lake.

August

August

September

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Blue Lake.

The whole year,
without the guesswork.

Nearby, measured,
and named.