United States · 1991–2020

Best time to visit
Saint John.

August leads for comfortable weather in Saint John: typically 23.5°C by day, 12.2°C at night, with 68 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high23.5°C

Typical low12.2°C

Rain in August68 mm

Comfort

August

August · July · June

85climate match

Beach

August

August · July · June

49climate match

Outdoors

September

September · June · August

85climate match

The weakest month is January, scoring 5 against August’s 85 — days reach only -10°C, 34° 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

5-10° / -19.5°

Feb

5-6.6° / -16.5°

Mar

5-1.3° / -10.5°

Apr

188.9° / -2.2°

May

4616.4° / 4.4°

Jun

6720.9° / 10.3°

Jul

8323.3° / 13°

Aug

8523.5° / 12.2°

Sep

6318.2° / 6.7°

Oct

2510° / -0.5°

Nov

5-0.1° / -8.6°

Dec

5-6.7° / -15.5°

Monthly climate evidence for Saint John — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-10°C	-19.5°C	9 mm	2.9	8 h 39	5	Good coverage
February	-6.6°C	-16.5°C	9 mm	2.5	10 h 04	5	Good coverage
March	-1.3°C	-10.5°C	16 mm	2.7	11 h 43	5	Good coverage
April	8.9°C	-2.2°C	25 mm	3.7	13 h 37	18	Good coverage
May	16.4°C	4.4°C	70 mm	8.3	15 h 15	46	Good coverage
June	20.9°C	10.3°C	92 mm	9.6	16 h 10	67	Good coverage
July	23.3°C	13°C	86 mm	7.3	15 h 48	83	Good coverage
August	23.5°C	12.2°C	68 mm	6.9	14 h 23	85	Good coverage
September	18.2°C	6.7°C	38 mm	5.8	12 h 31	63	Good coverage
October	10°C	-0.5°C	31 mm	4.3	10 h 42	25	Good coverage
November	-0.1°C	-8.6°C	22 mm	4.5	9 h 04	5	Good coverage
December	-6.7°C	-15.5°C	12 mm	3.4	8 h 15	5	Good coverage

Records at ROLLA 1NE, 1904–2009
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	12.8°C8 Jan 2003	-40.0°C26 Jan 1950	27 mm7 Jan 1989	59 mm1989 · driest 0 mm in 2009	73
February	14.4°C2 Feb 1992	-41.7°C2 Feb 1996	21 mm28 Feb 1974	54 mm1972 · driest 0 mm in 1971	74
March	23.9°C27 Mar 1946	-35.0°C1 Mar 1962	51 mm14 Mar 1971	75 mm1942 · driest 0 mm in 2008	74
April	34.4°C22 Apr 1980	-22.8°C5 Apr 1979	60 mm28 Apr 1991	107 mm1991 · driest 0 mm in 1952	74
May	34.4°C23 May 1980	-11.7°C3 May 1967	66 mm23 May 1981	172 mm1999 · driest 6 mm in 1980	74
June	36.1°C28 Jun 1988	-1.7°C1 Jun 1964	84 mm7 Jun 1954	333 mm1954 · driest 22 mm in 1974	75
July	37.8°C31 Jul 1946	2.2°C3 Jul 1967	107 mm11 Jul 1943	202 mm1993 · driest 3 mm in 1985	73
August	38.3°C7 Aug 1949	0.6°C31 Aug 1958	84 mm24 Aug 1968	220 mm1968 · driest 5 mm in 1961	72
September	36.7°C7 Sep 1976	-8.3°C29 Sep 1945	163 mm14 Sep 1905	182 mm1905 · driest 1 mm in 1948	73
October	32.2°C13 Oct 1958	-18.3°C31 Oct 1991	54 mm7 Oct 1994	135 mm1994 · driest 0 mm in 1961	74
November	23.9°C9 Nov 1999	-31.1°C28 Nov 1985	38 mm2 Nov 2000	79 mm2000 · driest 1 mm in 1969	74
December	17.8°C6 Dec 1939	-38.3°C23 Dec 1983	24 mm2 Dec 1982	48 mm1948 · driest 0 mm in 1954	74

Typical days per month at ROLLA 1NE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	31	<1	3
February	0	0	28	<1	3
March	0	0	30	<1	3
April	<1	0	20	<1	<1
May	2	<1	6	2	<1
June	7	<1	<1	3	0
July	11	2	0	3	0
August	12	2	0	2	0
September	4	<1	2	<1	0
October	<1	<1	17	<1	<1
November	0	0	28	<1	2
December	0	0	30	<1	3

How often, not how much — every day in ROLLA 1NE’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%	13%	<1%	8%	-15.1–-4.6°C
February	0%	11%	<1%	7%	-11.2–-2.0°C
March	<1%	13%	2%	8%	-5.0–4.0°C
April	9%	15%	2%	12%	6.0–13.1°C
May	32%	25%	6%	28%	14.4–20.5°C
June	50%	31%	10%	39%	19.9–24.1°C
July	69%	25%	8%	26%	22.9–27.8°C
August	67%	23%	7%	24%	21.7–27.8°C
September	39%	20%	4%	18%	15.5–21.8°C
October	12%	13%	2%	10%	8.6–15.2°C
November	<1%	14%	1%	9%	-3.4–5.0°C
December	0%	12%	<1%	6%	-11.6–-2.2°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.

1905Each stripe is one year’s mean temperature against the 68-year average. Warmest: 1987. Coolest: 1950.2007

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5061310
NOAA station: USC00327664 · ROLLA 1NE
Station distance: 11.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 17 usable years
Daylight: Calculated from latitude 48.94°, mid-month, sunrise to sunset including refraction. Not a station measurement.
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 ROLLA 1NE is what differs

Rolla→Perth→Arndt→

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

Best time to visitSaint John.

August

August

September

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.