United States · 1991–2020

Best time to visit
Lewis.

September leads for comfortable weather in Lewis: typically 25.4°C by day, 10.6°C at night, with 89 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.4°C

Typical low10.6°C

Rain in September89 mm

Comfort

September

September · August · June

77climate match

Beach

July

July · August · June

69climate match

Outdoors

October

October · September · May

72climate match

The weakest month is January, scoring 5 against September’s 77 — days reach only -0.7°C, 25° 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

5-0.7° / -11.8°

Feb

52.1° / -9.5°

Mar

169.8° / -3.3°

Apr

4016.9° / 2.7°

May

6422.6° / 9.6°

Jun

6528° / 15.4°

Jul

6129.8° / 17.6°

Aug

6828.7° / 15.8°

Sep

7725.4° / 10.6°

Oct

5118° / 3.8°

Nov

169.3° / -3.3°

Dec

52.1° / -8.9°

Monthly climate evidence for Lewis — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-0.7°C	-11.8°C	23 mm	4.6	9 h 30	5	Strong coverage
February	2.1°C	-9.5°C	31 mm	5	10 h 33	5	Strong coverage
March	9.8°C	-3.3°C	50 mm	5.8	11 h 48	16	Strong coverage
April	16.9°C	2.7°C	99 mm	8.9	13 h 15	40	Strong coverage
May	22.6°C	9.6°C	140 mm	11	14 h 28	64	Strong coverage
June	28°C	15.4°C	147 mm	9.3	15 h 08	65	Strong coverage
July	29.8°C	17.6°C	113 mm	8.1	14 h 53	61	Strong coverage
August	28.7°C	15.8°C	117 mm	7.4	13 h 50	68	Strong coverage
September	25.4°C	10.6°C	89 mm	6.7	12 h 25	77	Strong coverage
October	18°C	3.8°C	74 mm	6.5	11 h 01	51	Strong coverage
November	9.3°C	-3.3°C	42 mm	4.7	9 h 48	16	Strong coverage
December	2.1°C	-8.9°C	37 mm	4.6	9 h 12	5	Strong coverage

What has changed

Lewis runs +0.9°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

+0.9

Feb

+0.4

Mar

+2.1

Apr

-0.5

May

-0.5

Jun

+0.7

Jul

-0.1

Aug

+0.2

Sep

+2.1

Oct

+0.8

Nov

+1.4

Dec

+2.9

September daytime highs, 2011–2025. Last recorded: 26.9°C.

Records at ATLANTIC 1 NE, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	19.4°C26 Jan 2002	-38.3°C12 Jan 1974	32 mm27 Jan 1944	71 mm1949 · driest 0 mm in 1921	133
February	25.6°C27 Feb 2024	-37.8°C9 Feb 1975	39 mm21 Feb 1976	68 mm2001 · driest 0 mm in 1925	130
March	34.4°C22 Mar 2026	-35.6°C1 Mar 1962	55 mm1 Mar 2007	152 mm1973 · driest 0 mm in 1922	132
April	34.4°C10 Apr 1930	-15.6°C3 Apr 1975	69 mm5 Apr 1999	233 mm1999 · driest 0 mm in 1933	133
May	40.6°C30 May 1934	-8.3°C2 May 1908	115 mm6 May 2007	273 mm2016 · driest 0 mm in 1894	133
June	41.1°C25 Jun 1937	0.0°C6 Jun 1894	335 mm14 Jun 1998	455 mm1998 · driest 0 mm in 1933	134
July	47.2°C25 Jul 1936	2.8°C9 Jul 1895	136 mm21 Jul 1948	323 mm1998 · driest 0 mm in 2012	133
August	43.9°C5 Aug 1918	0.6°C30 Aug 1893	148 mm30 Aug 1922	305 mm1954 · driest 0 mm in 1898	133
September	40.0°C5 Sep 1913	-8.3°C29 Sep 1899	166 mm8 Sep 1989	335 mm1972 · driest 0 mm in 1908	133
October	35.6°C10 Oct 1893	-17.2°C30 Oct 1925	111 mm14 Oct 2007	251 mm2007 · driest 0 mm in 1893	133
November	28.3°C13 Nov 1999	-26.7°C28 Nov 1952	87 mm13 Nov 1909	207 mm1909 · driest 0 mm in 1912	130
December	22.2°C16 Dec 2021	-36.1°C19 Dec 1983	63 mm14 Dec 2015	168 mm2015 · driest 0 mm in 1896	132

Typical days per month at ATLANTIC 1 NE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	<1	5
February	0	0	26	<1	5
March	<1	0	23	2	2
April	4	<1	10	3	<1
May	12	3	1	4	<1
June	24	11	0	4	0
July	29	16	0	3	0
August	26	12	0	4	0
September	18	6	1	3	0
October	5	<1	9	2	<1
November	<1	0	22	1	1
December	0	0	29	1	4

How often, not how much — every day in ATLANTIC 1 NE’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%	11%	2%	6%	-4.8–3.6°C
February	<1%	13%	2%	10%	-2.8–6.1°C
March	10%	17%	5%	16%	4.7–13.1°C
April	30%	24%	8%	30%	13.9–19.9°C
May	55%	29%	11%	37%	20.3–25.4°C
June	71%	27%	12%	31%	26.0–30.2°C
July	79%	21%	8%	22%	28.4–33.4°C
August	78%	22%	9%	24%	26.9–32.1°C
September	71%	20%	8%	20%	22.6–28.1°C
October	41%	17%	6%	15%	15.5–21.4°C
November	6%	13%	4%	9%	5.8–12.3°C
December	0%	12%	3%	8%	-2.3–5.4°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.

1893Each stripe is one year’s mean temperature against the 118-year average. Warmest: 1931. Coolest: 1917.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4864556
NOAA station: USC00130364 · ATLANTIC 1 NE
Station distance: 14.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 41.31°, mid-month, sunrise to sunset including refraction. Not a station measurement.
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 ATLANTIC 1 NE is what differs

Atlantic→Anita→Walnut→Massena→Cumberland→Brayton→

Or put two places side by side: Lewis vs Atlantic

Best time to visitLewis.