What is the hottest month at Biscayne?

August, with an average high of 90°F and an average low of 73°F at Perrine 4w (NOAA 1991–2020 normals). The station averages 80 days a year at or above 90°F.

How cold does Biscayne get in winter?

January is the coldest month, averaging a low of 55°F and a high of 76°F at Perrine 4w. About 0 nights a year drop to freezing or below.

Does it snow at Biscayne?

Perrine 4w records almost no snowfall (0.0 inches a year). Higher elevations in the park can differ.

When is the rainy season at Biscayne?

August is the wettest month on average (10.2 inches of precipitation at Perrine 4w); the station's annual total is 66.5 inches.

How many hours of daylight does Biscayne get?

About 13h 43m on June 15 and 10h 34m on December 15 (sunrise 6:30 AM, sunset 8:13 PM in June; 6:59 AM to 5:33 PM in December, America/New York time).

What is the best month to visit Biscayne for weather?

By NOAA's normals, average highs sit between 55°F and 85°F in January, February, March, April, November and December. Weather in the park varies with elevation; this is the Perrine 4w station.

Weather by month

Biscayne weather, month by month

Last verified October 6, 2026NOAA 1991–2020 normalsAmerica/New York time

Average highs, lows, rain, snow and daylight for every month. Measured at the Perrine 4w (10 ft, 10.3 mi from Dante Fascell Visitor Center).

Downtown Miami in background. — Photo: NPS photo

Aug high: 90°F; hottest month
Jan low: 55°F; coldest month
Rain + snowmelt: 66.5in / yr; wettest: Aug
Snowfall: 0.0in / yr; rare
Days ≥ 90°F: 80/ yr
Nights ≤ 32°F: 0/ yr

Perrine 4w

Month by month

Normals are 30-year averages (1991–2020). Crowds = each month’s share of the park’s busiest month, from NPS visitor counts. Sunrise and sunset are for the 15th of each month in 2027.

Average high and low, every monthbars run from the low to the high · tan strip = precipitation

Month	High	Low	Rain	Wet days	Sunrise	Sunset	Daylight	Crowds
Jan	76°	55°	2.0″	8	7:09 AM	5:52 PM	10h 43m	74
Feb	78°	57°	2.3″	6	6:56 AM	6:14 PM	11h 18m	81
Mar	80°	59°	2.3″	6	7:30 AM	7:29 PM	11h 59m	96
Apr	84°	63°	3.4″	7	6:58 AM	7:44 PM	12h 45m	90
May	86°	68°	5.6″	11	6:36 AM	7:59 PM	13h 23m	100
Jun	89°	72°	10.1″	18	6:30 AM	8:13 PM	13h 43m	81
Jul	90°	73°	7.8″	18	6:39 AM	8:14 PM	13h 35m	95
Aug	90°	73°	10.2″	19	6:54 AM	7:57 PM	13h 02m	74
Sep	89°	73°	10.1″	18	7:07 AM	7:26 PM	12h 19m	74
Oct	86°	69°	7.6″	14	7:19 AM	6:54 PM	11h 35m	59
Nov	81°	63°	2.9″	9	6:38 AM	5:33 PM	10h 54m	66
Dec	78°	58°	2.3″	8	6:59 AM	5:33 PM	10h 34m	77

How to read this

These are NOAA’s official 1991–2020 climate normals for one weather station, not a model of the whole park. The station is the one with complete temperature and precipitation normals nearest to a visitor center. Highs and lows are daily averages for the month; “wet days” are days with at least 0.01 inch of precipitation. Mountain parks can be 10–20 °F cooler at their high points than at the station, and the NPS weather page for Biscayne is the place for current conditions and seasonal closures.

Sunrise and sunset are computed with the NOAA solar equations for the park’s coordinates and shown in America/New York time for the 15th of each month of 2027; they are accurate to about a minute.

Sources · 3

1.U.S. Climate Normals 1991–2020 — monthly normals station inventory · National Centers for Environmental Information (NOAA)
2.Biscayne National Park — Weather (nps.gov) · National Park Service
3.Biscayne National Park — Visitor Use Statistics · National Park Service (IRMA)

FAQ

Biscayne weather questions

What is the hottest month at Biscayne?: August, with an average high of 90°F and an average low of 73°F at Perrine 4w (NOAA 1991–2020 normals). The station averages 80 days a year at or above 90°F.
How cold does Biscayne get in winter?: January is the coldest month, averaging a low of 55°F and a high of 76°F at Perrine 4w. About 0 nights a year drop to freezing or below.
Does it snow at Biscayne?: Perrine 4w records almost no snowfall (0.0 inches a year). Higher elevations in the park can differ.
When is the rainy season at Biscayne?: August is the wettest month on average (10.2 inches of precipitation at Perrine 4w); the station's annual total is 66.5 inches.
How many hours of daylight does Biscayne get?: About 13h 43m on June 15 and 10h 34m on December 15 (sunrise 6:30 AM, sunset 8:13 PM in June; 6:59 AM to 5:33 PM in December, America/New York time).
What is the best month to visit Biscayne for weather?: By NOAA's normals, average highs sit between 55°F and 85°F in January, February, March, April, November and December. Weather in the park varies with elevation; this is the Perrine 4w station.

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