United States · 1991–2020

Best time to visit
Key Biscayne.

January leads for comfortable weather in Key Biscayne: typically 24.3°C by day, 16.3°C at night, with 46 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJanuary

Typical high24.3°C

Typical low16.3°C

Rain in January46 mm

Comfort

January

January · February · December

94climate match

Beach

April

April · November · March

87climate match

Outdoors

January

January · February · December

72climate match

The weakest month is August, scoring 25 against January’s 94 — days average 32.1°C, 8° above the 24°C the score treats as ideal, and nights stay at 26.1°C.

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

9424.3° / 16.3°

Feb

8725.4° / 18.2°

Mar

8026.4° / 19.4°

Apr

6828° / 21.7°

May

4929.3° / 23.7°

Jun

3131.1° / 25.3°

Jul

3231.9° / 26°

Aug

2532.1° / 26.1°

Sep

2731.5° / 25.8°

Oct

4129.8° / 24.2°

Nov

7027.4° / 21.1°

Dec

8225.6° / 18.8°

Monthly climate evidence for Key Biscayne — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 9 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	24.3°C	16.3°C	46 mm	4.7	24.7°C	10 h 42	94	Good coverage
February	25.4°C	18.2°C	48 mm	4.3	24.6°C	11 h 15	87	Good coverage
March	26.4°C	19.4°C	54 mm	4.7	24.9°C	11 h 56	80	Good coverage
April	28°C	21.7°C	72 mm	4.7	25.8°C	12 h 44	68	Good coverage
May	29.3°C	23.7°C	136 mm	7.7	27.0°C	13 h 23	49	Good coverage
June	31.1°C	25.3°C	173 mm	11.6	28.4°C	13 h 44	31	Good coverage
July	31.9°C	26°C	138 mm	11.7	29.2°C	13 h 36	32	Good coverage
August	32.1°C	26.1°C	173 mm	12.6	29.7°C	13 h 02	25	Good coverage
September	31.5°C	25.8°C	179 mm	12.5	29.3°C	12 h 16	27	Good coverage
October	29.8°C	24.2°C	154 mm	9.9	28.3°C	11 h 31	41	Good coverage
November	27.4°C	21.1°C	76 mm	5.9	26.9°C	10 h 51	70	Good coverage
December	25.6°C	18.8°C	63 mm	4.8	25.7°C	10 h 32	82	Good coverage

Records at CAPE FLORIDA, 1999–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	30.6°C24 Jan 2023	1.7°C10 Jan 2010	70 mm12 Jan 2022	253 mm2026 · driest 3 mm in 2009	27
February	30.6°C4 Feb 2023	1.7°C1 Feb 2026	63 mm6 Feb 2023	119 mm2023 · driest 1 mm in 2001	26
March	32.2°C8 Mar 2023	6.7°C4 Mar 2013	69 mm24 Mar 2024	214 mm2026 · driest 4 mm in 2016	27
April	35.6°C27 Apr 2015	9.4°C4 Apr 2005	78 mm9 Apr 2018	295 mm2023 · driest 1 mm in 2025	27
May	33.9°C15 May 2026	16.1°C10 May 2001	113 mm24 May 2001	358 mm2020 · driest 12 mm in 2010	27
June	35.6°C23 Jun 2009	17.8°C27 Jun 2003	221 mm4 Jun 2022	438 mm2024 · driest 28 mm in 2010	28
July	35.6°C22 Jul 2018	21.7°C3 Jul 2008	107 mm6 Jul 2021	306 mm2021 · driest 28 mm in 2003	28
August	35.6°C8 Aug 2023	21.7°C8 Aug 2002	178 mm26 Aug 2005	329 mm2019 · driest 21 mm in 2022	27
September	35.0°C11 Sep 2022	18.9°C6 Sep 2002	121 mm29 Sep 2001	535 mm2001 · driest 53 mm in 2008	27
October	33.9°C9 Oct 2016	12.2°C31 Oct 2012	193 mm4 Oct 2000	313 mm2020 · driest 21 mm in 2002	27
November	32.2°C1 Nov 2019	7.2°C22 Nov 2006	166 mm7 Nov 2003	270 mm2022 · driest 4 mm in 2024	27
December	31.1°C4 Dec 2018	2.8°C14 Dec 2010	120 mm4 Dec 2015	299 mm2015 · driest 3 mm in 2004	27

Typical days per month at CAPE FLORIDA, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	16	<1	1
February	19	<1	1
March	24	2	2
April	29	6	2
May	31	12	4
June	29	25	5
July	31	30	4
August	30	29	6
September	30	28	4
October	30	18	4
November	27	4	2
December	21	<1	2

How often, not how much — every day in CAPE FLORIDA’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	76%	16%	5%	15%	22.7–26.0°C
February	80%	15%	5%	7%	23.5–27.8°C
March	83%	16%	6%	12%	24.9–28.5°C
April	82%	17%	8%	14%	26.7–29.6°C
May	76%	24%	11%	29%	28.3–30.9°C
June	61%	39%	17%	53%	30.2–32.0°C
July	62%	38%	13%	50%	31.0–33.1°C
August	59%	40%	17%	57%	31.4–33.2°C
September	57%	43%	17%	60%	30.9–32.6°C
October	67%	32%	11%	37%	28.8–31.2°C
November	80%	20%	7%	20%	26.3–29.0°C
December	80%	16%	5%	12%	24.2–27.5°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.

2000Each stripe is one year’s mean temperature against the 25-year average. Warmest: 2019. Coolest: 2010.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4160789
NOAA station: USC00081306 · CAPE FLORIDA
Station distance: 2.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 20 usable years
Daylight: Calculated from latitude 25.69°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 9 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 CAPE FLORIDA is what differs

The Keyhole→Kendall-Palmetto Bay→

Or put two places side by side: Key Biscayne vs The Keyhole

Best time to visitKey Biscayne.

January

April

January

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Key Biscayne.

The whole year,
without the guesswork.

Nearby, measured,
and named.