United States · 1991–2020

Best time to visit
Lummi.

July leads for comfortable weather in Lummi: typically 22.2°C by day, 12.5°C at night, with 21 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high22.2°C

Typical low12.5°C

Rain in July21 mm

Comfort

July

July · August · June

90climate match

Beach

July

July · August · June

56climate match

Outdoors

June

June · September · July

92climate match

The weakest month is January, scoring 5 against July’s 90 — days reach only 7.8°C, 16° below the 24°C the score treats as ideal.

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

57.8° / 0.9°

Feb

129° / 1.1°

Mar

1911.2° / 2.8°

Apr

3614° / 5.1°

May

5717.3° / 8°

Jun

7319.5° / 10.7°

Jul

9022.2° / 12.5°

Aug

8922.5° / 12.3°

Sep

7119.8° / 9.4°

Oct

3714.7° / 6°

Nov

810.3° / 3.1°

Dec

57.3° / 1°

Monthly climate evidence for Lummi — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 21 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	7.8°C	0.9°C	113 mm	14.7	7.4°C	8 h 40	5	Strong coverage
February	9°C	1.1°C	73 mm	12.1	7.4°C	10 h 05	12	Strong coverage
March	11.2°C	2.8°C	83 mm	14	8.0°C	11 h 43	19	Strong coverage
April	14°C	5.1°C	71 mm	11.6	9.4°C	13 h 37	36	Strong coverage
May	17.3°C	8°C	55 mm	9.1	11.5°C	15 h 14	57	Strong coverage
June	19.5°C	10.7°C	39 mm	7.3	13.6°C	16 h 08	73	Strong coverage
July	22.2°C	12.5°C	21 mm	3.2	15.1°C	15 h 47	90	Strong coverage
August	22.5°C	12.3°C	30 mm	4.2	15.5°C	14 h 22	89	Strong coverage
September	19.8°C	9.4°C	48 mm	6.8	13.8°C	12 h 31	71	Strong coverage
October	14.7°C	6°C	93 mm	11.6	11.1°C	10 h 42	37	Strong coverage
November	10.3°C	3.1°C	132 mm	16.1	9.2°C	9 h 05	8	Strong coverage
December	7.3°C	1°C	109 mm	14.9	8.0°C	8 h 17	5	Strong coverage

What has changed

Lummi runs +1.0°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+1.8

Feb

-0.7

Mar

+0.7

Apr

+0.9

May

+1.4

Jun

+1.0

Jul

+1.5

Aug

+1.7

Sep

+1.2

Oct

+0.6

Nov

+0.9

Dec

+0.8

July daytime highs, 2011–2025. Last recorded: 23.0°C.

Records at BELLINGHAM INTL AP, 1949–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.6°C29 Jan 2024	-18.9°C25 Jan 1950	84 mm12 Jan 1976	269 mm1971 · driest 0 mm in 2013	76
February	22.2°C3 Feb 2012	-18.9°C1 Feb 1950	82 mm16 Feb 1949	221 mm1982 · driest 13 mm in 1993	76
March	24.4°C29 Mar 2004	-12.2°C10 Mar 1951	61 mm13 Mar 1982	179 mm1950 · driest 19 mm in 1965	76
April	28.3°C18 Apr 2016	-4.4°C20 Apr 1951	40 mm17 Apr 1992	155 mm1992 · driest 9 mm in 2004	76
May	32.2°C28 May 1983	-3.9°C1 May 1954	39 mm16 May 1988	151 mm1984 · driest 4 mm in 2018	76
June	37.2°C28 Jun 2021	2.8°C2 Jun 1999	45 mm3 Jun 1990	122 mm1971 · driest 0 mm in 1996	76
July	35.6°C29 Jul 2009	4.4°C6 Jul 1952	40 mm5 Jul 1992	73 mm1982 · driest 0 mm in 2023	75
August	37.8°C12 Aug 2021	3.3°C29 Aug 1969	51 mm12 Aug 1965	121 mm1962 · driest 0 mm in 1986	74
September	31.7°C20 Sep 1974	-2.2°C27 Sep 1972	70 mm1 Sep 1983	120 mm2019 · driest 0 mm in 2022	75
October	26.7°C16 Oct 2022	-6.7°C31 Oct 1984	63 mm16 Oct 2003	211 mm2003 · driest 7 mm in 1987	75
November	22.8°C8 Nov 2016	-16.1°C15 Nov 1955	73 mm9 Nov 1990	370 mm2021 · driest 35 mm in 1952	75
December	19.4°C10 Dec 2014	-18.3°C16 Dec 1964	66 mm30 Dec 1979	254 mm1979 · driest 0 mm in 2012	75

Typical days per month at BELLINGHAM INTL AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	13	3	1
February	0	0	12	2	<1
March	0	0	7	2	<1
April	<1	0	2	2	0
May	1	0	<1	2	0
June	3	<1	0	1	0
July	7	<1	0	<1	0
August	7	<1	0	1	0
September	3	<1	0	1	0
October	0	0	2	3	<1
November	0	0	9	4	0
December	0	0	13	3	<1

How often, not how much — every day in BELLINGHAM INTL 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	0%	47%	12%	64%	3.5–9.6°C
February	<1%	44%	8%	61%	6.4–11.4°C
March	<1%	43%	7%	59%	8.8–12.7°C
April	6%	36%	6%	47%	11.9–15.3°C
May	20%	28%	5%	34%	15.2–19.1°C
June	38%	24%	4%	25%	17.7–21.4°C
July	69%	12%	2%	8%	20.3–23.9°C
August	70%	15%	3%	15%	20.3–24.2°C
September	41%	23%	5%	27%	17.9–21.6°C
October	7%	39%	9%	57%	13.3–16.0°C
November	<1%	53%	14%	74%	8.5–11.8°C
December	0%	51%	12%	72%	4.2–9.0°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.

1949Each stripe is one year’s mean temperature against the 74-year average. Warmest: 2015. Coolest: 1955.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5801963
NOAA station: USW00024217 · BELLINGHAM INTL AP
Station distance: 5.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 48.79°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 21 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 BELLINGHAM INTL AP is what differs

Ferndale→Marietta-Alderwood→Marietta→Birchwood→Dewey→Laurel→

Or put two places side by side: Lummi vs Ferndale

Best time to visitLummi.

July

July

June

The whole year,without the guesswork.

Lummi runs +1.0°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Lummi.

The whole year,
without the guesswork.

Lummi runs +1.0°C
on the 1961–1990 baseline.

Nearby, measured,
and named.