United States · 1991–2020

Best time to visit
Marathon.

January leads for comfortable weather in Marathon: typically 24.3°C by day, 18°C at night, with 33 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJanuary

Typical high24.3°C

Typical low18°C

Rain in January33 mm

Comfort

January

January · February · December

93climate match

Beach

March

March · April · November

93climate match

Outdoors

January

January · February · December

72climate match

The weakest month is August, scoring 27 against January’s 93 — days average 33.1°C, 9° above the 24°C the score treats as ideal, and nights stay at 26.6°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

9324.3° / 18°

Feb

8425.8° / 19.5°

Mar

7827.2° / 20.7°

Apr

6529.2° / 23°

May

5030.8° / 24.7°

Jun

3932.3° / 26.3°

Jul

3432.9° / 26.6°

Aug

2733.1° / 26.6°

Sep

2932.1° / 26.1°

Oct

4030.1° / 24.7°

Nov

7427.2° / 21.8°

Dec

8225.5° / 20°

Monthly climate evidence for Marathon — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 11 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	24.3°C	18°C	33 mm	4.1	23.7°C	10 h 45	93	Good coverage
February	25.8°C	19.5°C	44 mm	3.6	23.6°C	11 h 17	84	Good coverage
March	27.2°C	20.7°C	30 mm	4.1	24.3°C	11 h 57	78	Good coverage
April	29.2°C	23°C	57 mm	3.3	25.6°C	12 h 42	65	Good coverage
May	30.8°C	24.7°C	85 mm	6	27.0°C	13 h 20	50	Good coverage
June	32.3°C	26.3°C	94 mm	8.2	28.6°C	13 h 40	39	Good coverage
July	32.9°C	26.6°C	104 mm	9.8	29.5°C	13 h 32	34	Good coverage
August	33.1°C	26.6°C	141 mm	11	29.9°C	13 h	27	Good coverage
September	32.1°C	26.1°C	149 mm	12.1	29.4°C	12 h 16	29	Good coverage
October	30.1°C	24.7°C	154 mm	9.3	28.1°C	11 h 32	40	Good coverage
November	27.2°C	21.8°C	45 mm	4.8	26.2°C	10 h 55	74	Good coverage
December	25.5°C	20°C	51 mm	4.9	24.8°C	10 h 37	82	Good coverage

Records at MARATHON AP, 1998–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	31.1°C3 Jan 2017	3.9°C11 Jan 2010	38 mm15 Jan 2016	133 mm2016 · driest 5 mm in 2001	28
February	31.7°C24 Feb 2019	6.1°C5 Feb 2009	62 mm13 Feb 2019	101 mm2007 · driest 1 mm in 2011	28
March	32.2°C16 Mar 2019	9.4°C5 Mar 2010	68 mm22 Mar 2024	110 mm2003 · driest 2 mm in 2020	28
April	34.4°C16 Apr 2020	13.3°C1 Apr 2003	90 mm29 Apr 2012	259 mm2012 · driest 2 mm in 2009	28
May	35.6°C14 May 2019	17.8°C8 May 2016	180 mm20 May 2024	398 mm2020 · driest 4 mm in 2010	29
June	36.7°C8 Jun 2019	18.3°C7 Jun 2008	139 mm3 Jun 2022	246 mm2024 · driest 1 mm in 1998	29
July	37.2°C13 Jul 2023	21.1°C21 Jul 2007	85 mm21 Jul 2006	269 mm2020 · driest 26 mm in 2024	29
August	36.1°C9 Aug 2023	21.1°C18 Aug 2007	182 mm26 Aug 2005	333 mm2008 · driest 45 mm in 2020	28
September	36.1°C16 Sep 2023	21.7°C29 Sep 2001	207 mm12 Sep 2020	348 mm2010 · driest 44 mm in 2018	28
October	33.9°C16 Oct 2009	14.4°C29 Oct 2008	210 mm12 Oct 2010	517 mm2011 · driest 23 mm in 2009	28
November	32.2°C1 Nov 2002	11.7°C22 Nov 2006	170 mm15 Nov 2023	201 mm2021 · driest 5 mm in 2007	28
December	31.1°C1 Dec 2016	6.7°C14 Dec 2010	83 mm6 Dec 2015	218 mm2023 · driest 5 mm in 1999	28

Typical days per month at MARATHON AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	17	<1	1
February	20	2	1
March	26	5	1
April	29	14	2
May	30	23	2
June	29	28	3
July	31	30	3
August	31	30	4
September	30	28	4
October	30	20	4
November	26	4	1
December	21	1	2

How often, not how much — every day in MARATHON AP’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	75%	14%	3%	9%	22.4–26.4°C
February	82%	12%	5%	7%	23.7–28.1°C
March	87%	12%	3%	7%	26.1–28.7°C
April	88%	12%	5%	8%	27.6–31.0°C
May	81%	20%	8%	24%	30.0–31.8°C
June	72%	28%	10%	32%	31.1–33.3°C
July	70%	30%	10%	35%	32.1–33.7°C
August	65%	35%	12%	49%	32.5–33.8°C
September	59%	41%	14%	60%	31.6–32.8°C
October	70%	31%	12%	34%	29.0–30.9°C
November	83%	16%	4%	13%	25.7–28.3°C
December	79%	17%	5%	12%	23.9–27.3°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.

1999Each stripe is one year’s mean temperature against the 27-year average. Warmest: 2019. Coolest: 2010.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4163379
NOAA station: USW00012896 · MARATHON AP
Station distance: 4.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 22 usable years
Daylight: Calculated from latitude 24.71°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 11 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 MARATHON AP is what differs

Key Colony Beach→Marathon Shores→Palms Subdivision Trailer Park→Galway Bay Mobile Home Park→Gulf View Trailer Haven→Terra Marine Trailer Park→

Or put two places side by side: Marathon vs Key Colony Beach

Best time to visitMarathon.

January

March

January

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Marathon.

The whole year,
without the guesswork.

Nearby, measured,
and named.