Norway · 1991–2020

Best time to visit
Sem.

July leads for comfortable weather in Sem: typically 22.2°C by day, 12.8°C at night, with 77 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high22.2°C

Typical low12.8°C

Rain in July77 mm

Comfort

July

July · June · August

78climate match

Beach

July

July · June · August

43climate match

Outdoors

June

June · July · May

85climate match

The weakest month is January, scoring 5 against July’s 78 — days reach only 1.3°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

51.3° / -4.3°

Feb

51.6° / -4.6°

Mar

55.8° / -2.1°

Apr

2711° / 1.9°

May

5016.4° / 6.6°

Jun

6820.1° / 10.4°

Jul

7822.2° / 12.8°

Aug

6420.9° / 11.9°

Sep

4816.8° / 8.6°

Oct

1310.3° / 3.8°

Nov

55.6° / 0.5°

Dec

52.4° / -3.2°

Monthly climate evidence for Sem — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 18 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	1.3°C	-4.3°C	93 mm	11.1	4.0°C	6 h 50	5	Good coverage
February	1.6°C	-4.6°C	71 mm	9.6	2.8°C	9 h 06	5	Good coverage
March	5.8°C	-2.1°C	66 mm	8.7	3.2°C	11 h 34	5	Good coverage
April	11°C	1.9°C	54 mm	7.2	6.1°C	14 h 22	27	Good coverage
May	16.4°C	6.6°C	65 mm	8.8	10.8°C	16 h 55	50	Good coverage
June	20.1°C	10.4°C	77 mm	8.8	14.9°C	18 h 33	68	Good coverage
July	22.2°C	12.8°C	77 mm	9.5	17.6°C	17 h 52	78	Good coverage
August	20.9°C	11.9°C	123 mm	12.2	18.2°C	15 h 31	64	Good coverage
September	16.8°C	8.6°C	111 mm	9.5	15.4°C	12 h 44	48	Good coverage
October	10.3°C	3.8°C	133 mm	12	11.8°C	10 h 03	13	Good coverage
November	5.6°C	0.5°C	133 mm	12.7	8.7°C	7 h 32	5	Good coverage
December	2.4°C	-3.2°C	104 mm	12.7	5.9°C	6 h 08	5	Good coverage

What has changed

Sem 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

+2.0

Feb

+2.8

Mar

+2.8

Apr

+2.7

May

+1.4

Jun

+0.9

Jul

+1.6

Aug

+1.1

Sep

+1.9

Oct

+0.9

Nov

+1.8

Dec

+2.0

July daytime highs, 2011–2025. Last recorded: 24.9°C.

Records at MELSOM, 1959–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	13.4°C14 Jan 1992	-28.1°C9 Jan 1982	49 mm6 Jan 2025	254 mm1988 · driest 1 mm in 1963	59
February	14.2°C28 Feb 2012	-31.4°C9 Feb 1966	38 mm19 Feb 1977	190 mm2014 · driest 1 mm in 1986	59
March	22.2°C27 Mar 2012	-24.2°C14 Mar 1962	49 mm29 Mar 1988	201 mm1988 · driest 3 mm in 1964	59
April	24.0°C26 Apr 1993	-10.9°C18 Apr 1966	62 mm24 Apr 2023	162 mm1959 · driest 0 mm in 1974	60
May	29.6°C30 May 2018	-3.4°C3 May 1981	58 mm27 May 1981	188 mm2015 · driest 0 mm in 2003	61
June	31.8°C27 Jun 1988	0.0°C1 Jun 1959	62 mm9 Jun 2017	155 mm2013 · driest 5 mm in 1982	61
July	33.4°C27 Jul 2018	5.1°C21 Jul 1983	65 mm15 Jul 2005	193 mm1988 · driest 9 mm in 1994	60
August	33.1°C3 Aug 1982	3.0°C30 Aug 1978	74 mm11 Aug 2014	288 mm1986 · driest 6 mm in 1976	60
September	25.7°C2 Sep 2021	-2.6°C27 Sep 1990	101 mm1 Sep 2015	316 mm2015 · driest 21 mm in 1959	59
October	21.0°C16 Oct 1985	-8.9°C24 Oct 2003	68 mm13 Oct 1976	349 mm2014 · driest 0 mm in 2003	59
November	17.4°C6 Nov 2020	-19.5°C23 Nov 1965	78 mm14 Nov 1970	302 mm1970 · driest 18 mm in 2011	59
December	13.4°C8 Dec 2016	-27.1°C31 Dec 2002	58 mm15 Dec 2012	340 mm2020 · driest 13 mm in 1963	59

Typical days per month at MELSOM, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	24	4
February	0	0	22	2
March	0	0	19	3
April	0	0	9	2
May	1	0	<1	2
June	3	<1	0	2
July	6	<1	0	2
August	3	0	0	4
September	0	0	<1	4
October	0	0	6	4
November	0	0	13	5
December	0	0	22	3

How often, not how much — every day in MELSOM’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%	36%	11%	47%	-4.6–4.3°C
February	0%	31%	7%	40%	-4.3–4.8°C
March	<1%	28%	7%	35%	1.7–8.4°C
April	<1%	25%	6%	29%	7.1–12.5°C
May	16%	28%	7%	34%	13.9–17.4°C
June	39%	28%	7%	38%	17.9–22.1°C
July	53%	32%	9%	43%	19.1–23.5°C
August	39%	36%	11%	49%	18.1–22.3°C
September	8%	34%	13%	45%	14.7–18.0°C
October	<1%	39%	15%	52%	8.2–12.3°C
November	0%	42%	15%	56%	2.2–7.5°C
December	0%	37%	10%	49%	-2.8–5.3°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.

1960Each stripe is one year’s mean temperature against the 57-year average. Warmest: 2020. Coolest: 1985.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 3139819
NOAA station: NOE00135018 · MELSOM
Station distance: 5.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 19 usable years
Daylight: Calculated from latitude 59.28°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 18 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 MELSOM is what differs

Sandefjord→Tønsberg→Moss→Horten→Larvik→Stokke→

Or put two places side by side: Sem vs Sandefjord

Best time to visitSem.

July

July

June

The whole year,without the guesswork.

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

Nearby, measured,and named.

Best time to visit
Sem.

The whole year,
without the guesswork.

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

Nearby, measured,
and named.