Sweden · 1991–2020

Best time to visit
Nynäshamn.

July leads for comfortable weather in Nynäshamn: typically 19.7°C by day, 15.3°C at night, with 40 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high19.7°C

Typical low15.3°C

Rain in July40 mm

Comfort

July

July · August · June

82climate match

Beach

July

July · August · June

52climate match

Outdoors

July

July · August · June

86climate match

The weakest month is January, scoring 5 against July’s 82 — days reach only 1.8°C, 22° 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

51.8° / -1.5°

Feb

51.3° / -2°

Mar

53.2° / -0.4°

Apr

176.5° / 2.3°

May

4011.1° / 6.7°

Jun

6416.2° / 11.6°

Jul

8219.7° / 15.3°

Aug

7819.5° / 15.4°

Sep

6115.3° / 11.6°

Oct

3410.1° / 7°

Nov

136.1° / 3.2°

Dec

53.4° / 0.2°

Monthly climate evidence for Nynäshamn — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 5 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	1.8°C	-1.5°C	25 mm	7.2	3.1°C	6 h 56	5	Strong coverage
February	1.3°C	-2°C	22 mm	6.2	2.0°C	9 h 09	5	Strong coverage
March	3.2°C	-0.4°C	21 mm	5.5	1.9°C	11 h 34	5	Strong coverage
April	6.5°C	2.3°C	26 mm	5.1	3.4°C	14 h 20	17	Strong coverage
May	11.1°C	6.7°C	31 mm	6.1	7.0°C	16 h 50	40	Strong coverage
June	16.2°C	11.6°C	40 mm	7.1	12.1°C	18 h 25	64	Strong coverage
July	19.7°C	15.3°C	40 mm	5.9	16.3°C	17 h 46	82	Strong coverage
August	19.5°C	15.4°C	51 mm	7.5	17.3°C	15 h 28	78	Strong coverage
September	15.3°C	11.6°C	40 mm	7.3	14.1°C	12 h 44	61	Strong coverage
October	10.1°C	7°C	43 mm	8.2	10.3°C	10 h 05	34	Strong coverage
November	6.1°C	3.2°C	42 mm	9.3	7.2°C	7 h 37	13	Strong coverage
December	3.4°C	0.2°C	38 mm	9.3	5.0°C	6 h 15	5	Strong coverage

What has changed

Nynäshamn runs +1.8°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

+2.4

Mar

+2.4

Apr

+2.0

May

+1.8

Jun

+1.4

Jul

+1.5

Aug

+1.4

Sep

+1.8

Oct

+1.2

Nov

+1.7

Dec

+1.8

July daytime highs, 2011–2025. Last recorded: 20.6°C.

Records at LANDSORT, 1924–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	9.4°C10 Jan 2007	-26.4°C25 Jan 1942	23 mm12 Jan 1979	110 mm1984 · driest 3 mm in 1940	102
February	10.4°C28 Feb 2021	-28.0°C20 Feb 1940	20 mm16 Feb 2024	59 mm1950 · driest 3 mm in 2025	102
March	12.5°C27 Mar 2012	-21.0°C4 Mar 1942	23 mm4 Mar 1999	75 mm1978 · driest 0 mm in 2022	102
April	17.2°C29 Apr 2025	-10.5°C5 Apr 1942	24 mm17 Apr 1999	89 mm1985 · driest 2 mm in 2025	103
May	23.2°C16 May 2018	-4.0°C1 May 1924	32 mm9 May 1997	82 mm2021 · driest 2 mm in 1985	103
June	27.5°C29 Jun 1953	2.5°C2 Jun 1928	41 mm26 Jun 1963	81 mm2012 · driest 0 mm in 1969	103
July	28.0°C9 Jul 1983	7.3°C14 Jul 1977	44 mm24 Jul 2010	139 mm1960 · driest 1 mm in 2018	102
August	29.0°C8 Aug 1975	6.8°C19 Aug 1949	80 mm7 Aug 1962	185 mm1960 · driest 0 mm in 1976	102
September	23.0°C1 Sep 1939	1.2°C23 Sep 1924	46 mm5 Sep 1935	174 mm1946 · driest 8 mm in 2006	102
October	17.3°C2 Oct 2015	-4.0°C24 Oct 1926	34 mm2 Oct 1974	131 mm1974 · driest 2 mm in 1937	102
November	14.2°C6 Nov 2020	-8.9°C30 Nov 1973	35 mm27 Nov 2012	147 mm1944 · driest 5 mm in 1983	102
December	10.7°C26 Dec 2011	-15.0°C20 Dec 1925	27 mm24 Dec 1981	115 mm1976 · driest 2 mm in 1933	102

Typical days per month at LANDSORT, 1991–2020
Month	Days 25°C+	Frost nights	Heavy rain (10 mm+)
January	0	19	<1
February	0	18	<1
March	0	15	<1
April	0	5	<1
May	0	0	<1
June	0	0	<1
July	<1	0	1
August	<1	0	2
September	0	0	1
October	0	<1	<1
November	0	5	<1
December	0	14	<1

How often, not how much — every day in LANDSORT’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%	2%	27%	-2.2–3.5°C
February	0%	21%	<1%	22%	-3.1–3.2°C
March	0%	17%	<1%	16%	-0.3–5.0°C
April	0%	19%	1%	19%	3.6–7.5°C
May	<1%	20%	2%	20%	8.8–12.1°C
June	9%	21%	3%	21%	14.4–17.6°C
July	33%	22%	4%	25%	17.3–21.2°C
August	27%	25%	5%	30%	16.8–20.9°C
September	2%	24%	4%	27%	13.0–16.8°C
October	0%	27%	3%	32%	8.1–11.6°C
November	0%	30%	3%	37%	4.0–7.1°C
December	0%	28%	2%	35%	0.7–5.0°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.

1929Each stripe is one year’s mean temperature against the 97-year average. Warmest: 2020. Coolest: 1942.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 2687636
NOAA station: SWE00138618 · LANDSORT
Station distance: 18.7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 58.90°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 5 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 LANDSORT is what differs

Trosa→Västerljung→Tuna→Södra Svärdsö→Sandvik→Sågsten→

Or put two places side by side: Nynäshamn vs Trosa

Best time to visitNynäshamn.

July

July

July

The whole year,without the guesswork.

Nynäshamn runs +1.8°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Nynäshamn.

The whole year,
without the guesswork.

Nynäshamn runs +1.8°C
on the 1961–1990 baseline.

Nearby, measured,
and named.