United States · 1991–2020

Best time to visit
Tewksbury.

September leads for comfortable weather in Tewksbury: typically 24.2°C by day, 10.8°C at night, with 99 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.2°C

Typical low10.8°C

Rain in September99 mm

Comfort

September

September · June · August

78climate match

Beach

July

July · August · June

68climate match

Outdoors

May

May · September · October

72climate match

The weakest month is January, scoring 5 against September’s 78 — days reach only 1.1°C, 23° 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

51.1° / -9.2°

Feb

53° / -8.4°

Mar

57.5° / -4.1°

Apr

3115° / 1.4°

May

6121.1° / 7.2°

Jun

7326.2° / 12.7°

Jul

6729.2° / 16.1°

Aug

7228.3° / 15.1°

Sep

7824.2° / 10.8°

Oct

3816.9° / 4°

Nov

1210.3° / -0.9°

Dec

54.3° / -5.5°

Monthly climate evidence for Tewksbury — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 39 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	1.1°C	-9.2°C	94 mm	9.5	4.9°C	9 h 22	5	Strong coverage
February	3°C	-8.4°C	82 mm	8	3.3°C	10 h 29	5	Strong coverage
March	7.5°C	-4.1°C	109 mm	9.1	3.5°C	11 h 48	5	Strong coverage
April	15°C	1.4°C	100 mm	9.7	5.8°C	13 h 19	31	Strong coverage
May	21.1°C	7.2°C	97 mm	10.5	10.1°C	14 h 35	61	Strong coverage
June	26.2°C	12.7°C	106 mm	9.7	14.7°C	15 h 17	73	Strong coverage
July	29.2°C	16.1°C	98 mm	9	18.2°C	15 h 01	67	Strong coverage
August	28.3°C	15.1°C	99 mm	8.2	18.8°C	13 h 55	72	Strong coverage
September	24.2°C	10.8°C	99 mm	8	17.0°C	12 h 26	78	Strong coverage
October	16.9°C	4°C	126 mm	9.7	13.5°C	10 h 58	38	Strong coverage
November	10.3°C	-0.9°C	97 mm	8.9	10.2°C	9 h 42	12	Strong coverage
December	4.3°C	-5.5°C	111 mm	9.6	7.5°C	9 h 04	5	Strong coverage

Records at LOWELL, 1885–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	21.1°C13 Jan 2020	-30.0°C28 Jan 1904	78 mm9 Jan 1956	199 mm1956 · driest 6 mm in 2021	121
February	25.0°C22 Feb 2018	-33.9°C16 Feb 1943	92 mm1 Feb 1898	257 mm1900 · driest 0 mm in 1987	121
March	31.7°C29 Mar 1998	-25.6°C9 Mar 1923	74 mm3 Mar 1947	348 mm2010 · driest 0 mm in 1915	122
April	35.6°C18 Apr 2002	-14.4°C1 Apr 1923	122 mm30 Apr 1904	282 mm1987 · driest 15 mm in 1999	121
May	36.7°C22 May 1911	-2.8°C2 May 1892	104 mm29 May 1906	294 mm2006 · driest 14 mm in 1955	123
June	39.4°C25 Jun 2025	0.6°C13 Jun 2004	117 mm19 Jun 1922	284 mm1998 · driest 7 mm in 1912	120
July	39.4°C5 Jul 1911	6.7°C1 Jul 1912	139 mm3 Jul 1915	325 mm1938 · driest 15 mm in 1905	119
August	39.4°C26 Aug 1948	3.3°C30 Aug 1986	139 mm20 Aug 1991	328 mm2011 · driest 13 mm in 1996	122
September	37.8°C2 Sep 1953	-3.3°C20 Sep 1979	177 mm11 Sep 1954	258 mm1933 · driest 3 mm in 1914	123
October	31.7°C7 Oct 1963	-7.2°C31 Oct 2020	161 mm14 Oct 1895	360 mm2005 · driest 1 mm in 1924	122
November	27.2°C2 Nov 1950	-17.2°C24 Nov 1989	117 mm25 Nov 1923	224 mm1921 · driest 0 mm in 1889	120
December	24.4°C8 Dec 1998	-28.9°C30 Dec 1917	70 mm19 Dec 1986	223 mm1969 · driest 22 mm in 1943	119

Typical days per month at LOWELL, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	3	6
February	0	0	26	3	5
March	<1	0	25	4	4
April	2	<1	13	3	<1
May	8	3	<1	3	0
June	19	7	0	4	0
July	27	15	0	3	0
August	26	12	0	3	0
September	13	4	<1	3	0
October	2	<1	7	3	<1
November	<1	0	19	3	1
December	0	0	26	4	4

How often, not how much — every day in LOWELL’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	<1%	27%	11%	26%	-1.2–4.5°C
February	<1%	25%	11%	21%	-0.3–5.6°C
March	2%	27%	11%	28%	4.3–10.9°C
April	15%	28%	10%	30%	11.4–17.1°C
May	48%	28%	9%	30%	18.7–23.8°C
June	69%	27%	10%	28%	24.0–27.9°C
July	74%	25%	9%	23%	26.8–30.8°C
August	75%	24%	9%	21%	25.7–29.5°C
September	65%	22%	9%	20%	21.8–25.6°C
October	26%	23%	9%	21%	15.1–19.3°C
November	3%	27%	11%	25%	7.7–12.6°C
December	<1%	26%	12%	25%	0.6–6.9°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.

1889Each stripe is one year’s mean temperature against the 104-year average. Warmest: 1953. Coolest: 1893.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4952762
NOAA station: USC00194313 · LOWELL
Station distance: 11.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 42.61°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 39 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 LOWELL is what differs

Lowell→Chelmsford→Dracut→Westford→Tyngsboro→Dunstable→

Or put two places side by side: Tewksbury vs Lowell

Best time to visitTewksbury.

September

July

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Tewksbury.

The whole year,
without the guesswork.

Nearby, measured,
and named.