Updated October 2026
Biscayne National Park Weather by Month
Biscayne National Park is warmest in August, when the nearest NOAA climate station averages a high of 91°F and a low of 79°F, and coldest in January, with an average high of 78°F and an average low of 63°F. September is the wettest month, with about 7.5 inches of precipitation.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 13 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Biscayne National Park can differ from these, particularly with elevation.
Warmest month
Aug
91°F avg high
Coldest month
Jan
63°F avg low
Wettest month
Sep
7.5 in avg
Longest days
Jun
13.6 h of daylight
Average weather at Biscayne by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 78°F | 63°F | 2.4 in | 10.6 h |
| February | 79°F | 65°F | 2.0 in | 11.1 h |
| March | 81°F | 67°F | 2.4 in | 11.8 h |
| April | 84°F | 72°F | 3.2 in | 12.6 h |
| May | 87°F | 75°F | 5.7 in | 13.2 h |
| June | 90°F | 78°F | 7.4 in | 13.6 h |
| July | 91°F | 79°F | 5.6 in | 13.4 h |
| August | 91°F | 79°F | 7.1 in | 12.9 h |
| September | 90°F | 79°F | 7.5 in | 12.1 h |
| October | 87°F | 76°F | 6.3 in | 11.4 h |
| November | 83°F | 71°F | 3.5 in | 10.7 h |
| December | 80°F | 66°F | 2.2 in | 10.4 h |
| Year total | 55.3 in |
NOAA 1991–2020 climate normals from station USC00081306, 13 miles from the park's reference point. The station's snowfall normal is zero in all twelve months. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Biscayne is at that time of year.
Biscayne weather by season
Winter: December to February
Average highs hold near 79°F in all three months, with average lows between 63°F and 66°F. Together the three months average 6.6 inches of precipitation, about 12% of the yearly total and less than in any other season. Daylight is at its shortest, about 10.4 hours in December.
Spring: March to May
Average highs climb from 81°F in March to 87°F in May, with average lows between 67°F and 75°F. Together the three months average 11.3 inches of precipitation, about 20% of the yearly total. Daylight lengthens from about 11.8 hours in March to 13.2 in May.
Summer: June to August
Average highs hold near 91°F in all three months, with average lows near 79°F. The average high is 90°F or hotter in all three months. Together the three months average 20.1 inches of precipitation, about 36% of the yearly total and more than in any other season. Daylight is at its longest, about 13.6 hours in June.
Fall: September to November
Average highs fall from 90°F in September to 83°F in November, with average lows between 71°F and 79°F. The average high is 90°F or hotter in September. Together the three months average 17.3 inches of precipitation, about 31% of the yearly total. Daylight shortens from about 12.1 hours in September to 10.7 in November.
What the National Park Service says about the weather
The park is situated in a subtropical climate, which ensures sunshine year-round. Winters are normally dry and mild, with occasional fronts bringing wind and little rain. Summer brings hot and humid weather with scattered thunderstorms in the afternoons. The average temperature in January is 68 degrees Fahrenheit and 82 in July. The average rainfall for the area is 2.17 inches in January and 3.95 inches in July. June to November is hurricane season.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Biscayne
Averages describe a typical month, not this week. For current conditions and the seven-day outlook, the National Weather Service issues a forecast for the park's reference point at 25.49°N, 80.21°W. It covers that one spot, so other elevations in the park can differ from it, as they do from the averages above.
National Weather Service forecast for Biscayne National Park →
Weather and crowds together
August, the warmest month, sees about 1.0× the visitors of the park's average month. July is the busiest month of the year and October the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Biscayne National Park. For hotels, cabins and rentals close to the park, see where to stay near Biscayne.
Where to stay near Biscayne
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Frequently Asked Questions
August is the warmest month at Biscayne National Park, with an average high of 91°F and an average low of 79°F. That is the 1991–2020 average at the nearest long-record NOAA station, 13 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Biscayne National Park, with an average low of 63°F and an average high of 78°F, based on NOAA 1991–2020 climate normals.
September is the wettest month, with about 7.5 inches of precipitation. February is the driest, at about 2 inches. The station records about 55.3 inches of precipitation in an average year.
The nearest long-record NOAA station, 13 miles from the park's reference point, shows no measurable snowfall in any month of its 1991–2020 normals.
Weather at nearby parks
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00081306), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1979–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.