United States · 1991–2020

Best time to visit
Somersworth.

September leads for comfortable weather in Somersworth: typically 23°C by day, 10.4°C at night, with 82 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23°C

Typical low10.4°C

Rain in September82 mm

Comfort

September

September · August · June

79climate match

Beach

July

July · August · June

65climate match

Outdoors

September

September · May · June

78climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only 0.1°C, 24° 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

50.1° / -9.3°

Feb

51.9° / -8.2°

Mar

56.5° / -3.9°

Apr

2713.7° / 1.7°

May

5819.7° / 7.3°

Jun

7724.4° / 12.4°

Jul

7327.8° / 15.6°

Aug

7827.2° / 14.6°

Sep

7923° / 10.4°

Oct

3915.7° / 4.7°

Nov

119.3° / -0.6°

Dec

53° / -5.7°

Monthly climate evidence for Somersworth — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 25 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	0.1°C	-9.3°C	51 mm	7.2	5.5°C	9 h 18	5	Good coverage
February	1.9°C	-8.2°C	63 mm	7.3	4.1°C	10 h 26	5	Good coverage
March	6.5°C	-3.9°C	85 mm	8.2	3.6°C	11 h 47	5	Good coverage
April	13.7°C	1.7°C	101 mm	9.4	5.5°C	13 h 20	27	Good coverage
May	19.7°C	7.3°C	90 mm	9.8	9.3°C	14 h 39	58	Good coverage
June	24.4°C	12.4°C	106 mm	10.5	13.8°C	15 h 22	77	Good coverage
July	27.8°C	15.6°C	91 mm	9.2	17.2°C	15 h 05	73	Good coverage
August	27.2°C	14.6°C	82 mm	7.4	18.1°C	13 h 57	78	Good coverage
September	23°C	10.4°C	82 mm	6.7	16.4°C	12 h 27	79	Good coverage
October	15.7°C	4.7°C	111 mm	8.4	12.9°C	10 h 57	39	Good coverage
November	9.3°C	-0.6°C	91 mm	8.3	9.6°C	9 h 38	11	Good coverage
December	3°C	-5.7°C	85 mm	8.4	7.4°C	8 h 59	5	Good coverage

Records at ROCHESTER SKYHAVEN AP, 2000–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	19.4°C6 Jan 2007	-26.0°C16 Jan 2009	47 mm10 Jan 2024	161 mm2023 · driest 12 mm in 2004	27
February	23.9°C21 Feb 2018	-24.9°C4 Feb 2023	60 mm13 Feb 2008	184 mm2008 · driest 15 mm in 2024	27
March	29.4°C22 Mar 2012	-20.5°C9 Mar 2007	90 mm30 Mar 2010	281 mm2010 · driest 18 mm in 2006	27
April	33.9°C17 Apr 2002	-9.3°C5 Apr 2016	111 mm16 Apr 2007	219 mm2007 · driest 28 mm in 2001	27
May	35.0°C26 May 2010	-2.7°C11 May 2010	103 mm13 May 2006	256 mm2006 · driest 16 mm in 2015	27
June	37.8°C24 Jun 2025	0.6°C1 Jun 2020	65 mm2 Jun 2012	167 mm2012 · driest 21 mm in 2021	27
July	37.8°C22 Jul 2011	7.2°C3 Jul 2001	82 mm24 Jul 2008	299 mm2021 · driest 25 mm in 2002	27
August	37.8°C4 Aug 2022	4.4°C22 Aug 2007	76 mm13 Aug 2014	194 mm2023 · driest 9 mm in 2016	26
September	35.6°C9 Sep 2002	-2.2°C29 Sep 2000	89 mm6 Sep 2008	227 mm2008 · driest 13 mm in 2019	26
October	30.6°C6 Oct 2025	-7.1°C31 Oct 2020	132 mm8 Oct 2005	370 mm2005 · driest 23 mm in 2013	26
November	27.2°C6 Nov 2024	-14.4°C25 Nov 2000	56 mm25 Nov 2008	193 mm2018 · driest 19 mm in 2012	26
December	22.2°C6 Dec 2001	-24.3°C29 Dec 2017	57 mm14 Dec 2019	151 mm2019 · driest 23 mm in 2025	26

Typical days per month at ROCHESTER SKYHAVEN AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	28	1
February	0	0	27	2
March	<1	0	25	3
April	2	<1	12	3
May	6	2	<1	3
June	15	5	0	3
July	25	10	0	3
August	24	7	0	3
September	10	2	<1	3
October	1	0	6	3
November	0	0	18	3
December	0	0	27	3

How often, not how much — every day in ROCHESTER SKYHAVEN 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%	24%	5%	25%	-2.5–3.3°C
February	<1%	25%	6%	28%	-0.5–4.7°C
March	3%	27%	9%	33%	3.7–9.6°C
April	14%	32%	11%	41%	11.3–15.6°C
May	41%	31%	11%	38%	17.8–22.3°C
June	61%	34%	11%	43%	23.3–27.0°C
July	69%	30%	9%	37%	25.2–29.7°C
August	75%	25%	9%	25%	25.8–29.1°C
September	61%	22%	9%	22%	21.5–24.8°C
October	20%	27%	11%	25%	14.3–18.5°C
November	4%	27%	10%	33%	7.1–12.5°C
December	<1%	27%	10%	33%	0.5–5.8°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.

2000Each stripe is one year’s mean temperature against the 26-year average. Warmest: 2024. Coolest: 2000.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5092813
NOAA station: USW00054791 · ROCHESTER SKYHAVEN AP
Station distance: 5.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 43.26°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 25 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 ROCHESTER SKYHAVEN AP is what differs

Rochester→South Berwick→Farmington→Strafford→Rollinsford→New Durham→

Or put two places side by side: Somersworth vs Rochester

Best time to visitSomersworth.

September

July

September

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Somersworth.

The whole year,
without the guesswork.

Nearby, measured,
and named.