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Canada · 1991–2020

Best time to visit
Saint John.

August leads for comfortable weather in Saint John: typically 22.6°C by day, 11°C at night, with 72 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high22.6°C

Typical low11°C

Rain in August72 mm

Comfort

August

August · July · June

80climate match

Beach

August

August · July · June

42climate match

Outdoors

June

June · August · July

81climate match

The weakest month is January, scoring 5 against August’s 80 — days reach only -2.7°C, 27° 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

5-2.7° / -13.4°

Feb

5-1.6° / -12.7°

Mar

52.8° / -7.2°

Apr

68.9° / -1.4°

May

3715.2° / 3.7°

Jun

6220° / 8.3°

Jul

7722.7° / 11.5°

Aug

8022.6° / 11°

Sep

5418.6° / 7.5°

Oct

1912.5° / 2.6°

Nov

56.9° / -1.9°

Dec

51.1° / -8.5°

Monthly climate evidence for Saint John — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 17 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	-2.7°C	-13.4°C	114 mm	12.3	4.6°C	9 h 06	5	Good coverage
February	-1.6°C	-12.7°C	91 mm	10	2.9°C	10 h 19	5	Good coverage
March	2.8°C	-7.2°C	111 mm	10.8	2.2°C	11 h 46	5	Good coverage
April	8.9°C	-1.4°C	95 mm	10.2	3.3°C	13 h 26	6	Good coverage
May	15.2°C	3.7°C	92 mm	9.9	5.9°C	14 h 51	37	Good coverage
June	20°C	8.3°C	84 mm	9.4	9.4°C	15 h 38	62	Good coverage
July	22.7°C	11.5°C	88 mm	8.6	12.6°C	15 h 19	77	Good coverage
August	22.6°C	11°C	72 mm	7	13.9°C	14 h 05	80	Good coverage
September	18.6°C	7.5°C	108 mm	8.4	13.2°C	12 h 28	54	Good coverage
October	12.5°C	2.6°C	140 mm	9.5	11.5°C	10 h 52	19	Good coverage
November	6.9°C	-1.9°C	131 mm	11.1	9.7°C	9 h 27	5	Good coverage
December	1.1°C	-8.5°C	123 mm	12.3	7.4°C	8 h 45	5	Good coverage

Records at SAINT JOHN A, 1946–2012
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	14.5°C14 Jan 2006	-33.2°C16 Jan 2009	83 mm26 Jan 1978	300 mm1952 · driest 26 mm in 1970	64
February	13.3°C21 Feb 1994	-36.7°C11 Feb 1948	95 mm5 Feb 1947	274 mm1947 · driest 26 mm in 1993	65
March	25.4°C21 Mar 2012	-30.0°C14 Mar 1948	78 mm8 Mar 2008	216 mm1994 · driest 23 mm in 2006	64
April	22.8°C20 Apr 1976	-16.7°C4 Apr 1969	126 mm1 Apr 1962	240 mm1962 · driest 15 mm in 1966	64
May	33.0°C22 May 1992	-7.8°C15 May 1947	67 mm21 May 1973	279 mm1979 · driest 28 mm in 1955	64
June	32.0°C22 Jun 1983	-2.2°C1 Jun 1949	108 mm1 Jun 1985	269 mm1985 · driest 18 mm in 1991	63
July	32.8°C26 Jul 1963	1.1°C8 Jul 1948	79 mm25 Jul 1990	195 mm2009 · driest 17 mm in 1968	63
August	34.4°C22 Aug 1976	-0.6°C30 Aug 1947	125 mm2 Aug 1970	229 mm1970 · driest 1 mm in 1993	63
September	33.1°C1 Sep 2010	-6.7°C29 Sep 1947	104 mm7 Sep 2008	238 mm1949 · driest 33 mm in 1995	63
October	28.3°C9 Oct 2011	-10.6°C22 Oct 1974	88 mm24 Oct 2009	253 mm2009 · driest 9 mm in 1947	63
November	21.7°C1 Nov 1956	-16.9°C30 Nov 1996	154 mm13 Nov 1975	285 mm1975 · driest 47 mm in 1952	64
December	16.4°C12 Dec 2008	-34.4°C30 Dec 1989	106 mm4 Dec 1967	307 mm1964 · driest 42 mm in 2001	63

Typical days per month at SAINT JOHN A, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	4	12
February	0	0	27	3	11
March	<1	0	28	4	9
April	0	0	20	3	5
May	<1	0	5	3	<1
June	3	<1	<1	3	0
July	8	<1	0	3	0
August	7	<1	0	2	0
September	1	<1	1	3	0
October	0	0	10	4	<1
November	0	0	19	4	3
December	0	0	28	5	9

How often, not how much — every day in SAINT JOHN A’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%	42%	15%	60%	-6.0–-0.3°C
February	0%	38%	13%	55%	-4.3–0.4°C
March	<1%	36%	12%	51%	0.8–4.2°C
April	<1%	36%	11%	46%	6.3–10.1°C
May	10%	35%	12%	48%	13.2–17.1°C
June	38%	34%	10%	43%	18.1–20.6°C
July	62%	29%	10%	33%	21.0–23.8°C
August	60%	27%	9%	28%	20.5–23.5°C
September	23%	28%	12%	35%	16.7–19.8°C
October	3%	31%	13%	37%	10.7–14.1°C
November	<1%	39%	16%	56%	4.5–8.6°C
December	0%	43%	16%	64%	-2.2–3.1°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.

1948Each stripe is one year’s mean temperature against the 62-year average. Warmest: 1953. Coolest: 1948.2011

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 6138517
NOAA station: CA008104900 · SAINT JOHN A
Station distance: 14.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 45.27°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 17 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 SAINT JOHN A is what differs

Quispamsis→Saint John East→Rothesay→Uptown Saint John→Millidgeville→Fairvale→

Or put two places side by side: Saint John vs Quispamsis

Best time to visitSaint John.

August

August

June

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Saint John.

The whole year,
without the guesswork.

Nearby, measured,
and named.