Canada · 1991–2020

Best time to visit
Hamilton.

August leads for comfortable weather in Hamilton: typically 26.6°C by day, 15°C at night, with 56 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high26.6°C

Typical low15°C

Rain in August56 mm

Comfort

August

August · June · September

85climate match

Beach

August

August · July · June

69climate match

Outdoors

May

May · September · June

80climate match

The weakest month is January, scoring 5 against August’s 85 — 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

5-0.1° / -8°

Feb

51° / -7.7°

Mar

55.6° / -3.6°

Apr

2612.3° / 1.8°

May

6019.2° / 7.8°

Jun

8424.5° / 12.9°

Jul

7627.5° / 15.6°

Aug

8526.6° / 15°

Sep

8323° / 11.4°

Oct

4415.5° / 5.5°

Nov

189.1° / 0.8°

Dec

52.9° / -3.9°

Monthly climate evidence for Hamilton — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 23 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	-0.1°C	-8°C	56 mm	9.4	3.5°C	9 h 18	5	Good coverage
February	1°C	-7.7°C	53 mm	7.3	2.8°C	10 h 26	5	Good coverage
March	5.6°C	-3.6°C	67 mm	9	2.8°C	11 h 47	5	Good coverage
April	12.3°C	1.8°C	83 mm	8.9	3.9°C	13 h 20	26	Good coverage
May	19.2°C	7.8°C	74 mm	8.9	7.6°C	14 h 39	60	Good coverage
June	24.5°C	12.9°C	77 mm	8.6	15.0°C	15 h 22	84	Good coverage
July	27.5°C	15.6°C	81 mm	7.9	19.8°C	15 h 05	76	Good coverage
August	26.6°C	15°C	56 mm	6.5	21.1°C	13 h 57	85	Good coverage
September	23°C	11.4°C	65 mm	6.2	19.0°C	12 h 27	83	Good coverage
October	15.5°C	5.5°C	71 mm	9.1	13.0°C	10 h 57	44	Good coverage
November	9.1°C	0.8°C	61 mm	7.5	7.5°C	9 h 38	18	Good coverage
December	2.9°C	-3.9°C	56 mm	8.5	4.9°C	8 h 59	5	Good coverage

Records at HAMILTON RBG CS, 1997–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.1°C13 Jan 2005	-25.4°C27 Jan 2003	42 mm13 Jan 2013	113 mm1998 · driest 2 mm in 2008	28
February	18.8°C23 Feb 2017	-27.3°C16 Feb 2015	43 mm17 Feb 2022	95 mm2022 · driest 20 mm in 2007	28
March	26.5°C22 Mar 2012	-24.7°C3 Mar 2003	51 mm13 Mar 2010	205 mm2008 · driest 21 mm in 2014	28
April	29.4°C16 Apr 2002	-11.5°C5 Apr 2016	72 mm20 Apr 2017	155 mm2017 · driest 36 mm in 1999	28
May	35.0°C29 May 2006	-2.2°C1 May 2008	47 mm25 May 2017	151 mm2017 · driest 16 mm in 2005	28
June	35.2°C22 Jun 2025	1.1°C4 Jun 1998	43 mm27 Jun 2015	207 mm2000 · driest 30 mm in 2007	28
July	38.1°C17 Jul 2012	7.4°C3 Jul 2015	63 mm12 Jul 2006	194 mm2023 · driest 12 mm in 2011	27
August	37.3°C8 Aug 2001	6.0°C22 Aug 2004	51 mm25 Aug 2016	131 mm2023 · driest 3 mm in 2007	26
September	34.9°C6 Sep 2007	-0.8°C29 Sep 2000	53 mm29 Sep 1999	143 mm2021 · driest 1 mm in 2007	26
October	31.7°C8 Oct 2007	-6.1°C31 Oct 2020	60 mm19 Oct 2011	168 mm2021 · driest 1 mm in 2007	26
November	25.9°C5 Nov 2022	-13.7°C22 Nov 2018	54 mm2 Nov 1999	107 mm2005 · driest 2 mm in 2007	26
December	19.6°C6 Dec 1998	-21.4°C20 Dec 2004	43 mm1 Dec 2006	94 mm2006 · driest 1 mm in 2007	26

Typical days per month at HAMILTON RBG CS, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	26	1
February	0	0	25	2
March	<1	0	23	2
April	1	0	10	3
May	5	1	<1	3
June	14	4	0	3
July	22	8	0	3
August	21	5	0	2
September	10	2	0	2
October	1	0	4	2
November	0	0	12	2
December	0	0	24	2

How often, not how much — every day in HAMILTON RBG CS’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%	31%	5%	38%	-3.5–2.7°C
February	0%	27%	6%	29%	-2.3–4.2°C
March	2%	30%	7%	35%	3.3–9.4°C
April	8%	31%	10%	40%	10.4–14.2°C
May	33%	28%	8%	33%	16.8–21.5°C
June	60%	29%	10%	30%	22.6–26.5°C
July	73%	27%	8%	31%	25.2–30.2°C
August	77%	22%	6%	19%	25.0–28.3°C
September	58%	21%	8%	24%	21.4–24.9°C
October	16%	30%	6%	37%	13.9–17.4°C
November	3%	25%	6%	32%	6.6–11.9°C
December	0%	28%	6%	33%	-0.3–5.8°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.

1998Each stripe is one year’s mean temperature against the 24-year average. Warmest: 2012. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5969782
NOAA station: CA006153301 · HAMILTON RBG CS
Station distance: 7.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 20 usable years
Daylight: Calculated from latitude 43.25°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 23 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 HAMILTON RBG CS is what differs

Burlington→Waterdown→Aldershot→Ancaster Heights→Bartonville→Bayview→

Or put two places side by side: Hamilton vs Burlington

Best time to visitHamilton.

August

August

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Hamilton.

The whole year,
without the guesswork.

Nearby, measured,
and named.