Miami Weather Guide

Miami averages a daily high of 84.2 F and a daily low of 70.7 F across the year, with 67.41 inches of rain, under the 1991-2020 normals for the Miami climate station (NOAA NCEI annual normals).

The annual mean temperature in Miami is 77.4 F. The coolest month is January, with a normal high of 76.2 F and a normal low of 61.0 F, and the warmest is August, with a normal high of 90.7 F and a low of 77.7 F (NOAA NCEI monthly normals). The normal high rises only 14.5 degrees from January to August.

Heat at the top of the scale is routine in Miami. The station normal is 91.4 days a year with a high of 90 F or more, while nights below 50 F number only 7.9 in an average year (NOAA NCEI annual normals). No month has a normal low below 61.0 F or a normal high above 90.7 F.

Miami has continuous weather records from 1895 to the present, with some earlier records from 1839 to 1890, according to the NWS Miami local climate page. On the preliminary NWS top 10 list for the Miami area, 2023 is the warmest year at 79.9 F and 1940 the coldest at 72.9 F. The list was last updated on February 19, 2026, and includes 2024 at 78.6 F and 2025 at 78.3 F, so two of the most recent years already rank among the ten warmest in Miami.

Miami gets most of its rain from May through October, when the monthly normals add up to 51.64 of the year's 67.41 inches, about 77 percent of the total (NOAA NCEI monthly normals).

June is the wettest month in Miami, with a normal of 10.51 inches, and September is close behind at 10.22 inches. July dips to 7.36 inches between them, and August returns to 9.58 inches. The dry season runs the other way: January averages 1.83 inches, February 2.15 and December 2.44 (NOAA NCEI monthly normals).

Single years swing far from the normal. On the preliminary NWS list for the Miami area, the wettest year is 1959 with 89.33 inches and the driest is 1907 with 33.15 inches (NWS Miami local climate page). The 2023 total of 83.43 inches ranks sixth wettest, so the warmest year on the Miami record was also one of its rainiest.

Thunderstorms were frequent in September 2026: the NWS Miami monthly climate report for that month counted 22 days with thunderstorms at the Miami site during that month (NWS Miami September 2026 climate report). The report is not the certified record: the NWS Miami climate page states that certified (official) climate data is available from NCEI.

The Atlantic hurricane season, which covers Miami, runs from June 1 to November 30, and the peak falls on September 10, with most activity between mid-August and mid-October (National Hurricane Center).

An average Atlantic season, based on 1991-2020, produces 14 named storms, 7 hurricanes and 3 major hurricanes of Category 3 or higher (National Hurricane Center climatology). Those are basin totals, not storms that strike Miami. Miami-Dade County warns that hurricanes bring destructive winds, torrential rain and life-threatening storm surge (Miami-Dade County hurricanes page).

The storm that set the Miami benchmark was the Great Miami Hurricane of 1926. The Weather Bureau first learned of it from ship reports in the central tropical Atlantic on September 11, 1926, and the Miami office hoisted hurricane warnings around 11 PM on September 17 (NWS Miami 1926 hurricane page). The worst of the storm brought a 10 foot storm surge onto Miami Beach and the barrier islands, and water from the Atlantic crossed Biscayne Bay into the City of Miami for several city blocks. On October 9, 1926, the Red Cross reported that 372 people had died.

September 2026 marked 100 years since that storm, and the NWS Miami climate page now lists a video documentary, 1926 Great Miami Hurricane: 100 Years Later (NWS Miami local climate page). Which Miami neighborhoods lie in each storm surge planning zone is covered in the Miami hurricane evacuation zones guide, and flood insurance zones in the Miami flood risk zones guide.

Miami-Dade County runs a Heat Season protocol every year from May 1 to October 31, the period of chronic high heat and humidity that covers all of Miami (Miami-Dade County Extreme Heat).

The county says that since 1970, Miami-Dade has seen days above 90 F rise on average from 84 to 133 days per year (Miami-Dade County). That county figure differs from the 91.4 days at 90 F or more in the 1991-2020 normal for the Miami station (NOAA NCEI annual normals). The two cover different areas and periods: the county figure is a countywide change since 1970, the NCEI figure a 1991-2020 average at one Miami station.

September 2026 ran slightly warm. The NWS Miami monthly climate report for September 2026 shows an average daily maximum of 89.8 F at the Miami site, against a normal of 89.0 F, while the average minimum of 76.5 F came in just under the 76.9 F normal (NWS Miami September 2026 climate report). The same report lists the September record high for Miami as 97 F, set on September 8, 1987.

For day to day planning in Miami, the NWS Miami heat page posts heat index forecast maps for Miami-Dade County and updates them at least twice per day, shortly after 4 AM and 4 PM Eastern Time (NWS Miami heat page).

Miami forecasts come from the National Weather Service Miami South Florida office at 11691 SW 17th Street, Miami, phone 305-229-4522, while emergency alerts come from the City of Miami and Miami-Dade County (NWS Miami).

The City of Miami Division of Emergency Management works from the Miami Riverside Center, 10th Floor, 444 SW 2nd Avenue, and answers at 305-416-5439 (City of Miami Emergency Management). City residents sign up for emergency text alerts by texting ALERTMIAMI to 888777, and the same city page links its hurricane guide.

Miami-Dade County, a separate government from the City of Miami, keeps its own hurricane page, which offers the Ready Miami-Dade app, a Storm Surge Planning Zone lookup and the Emergency and Evacuation Assistance Program (EEAP) for residents who need specialized transportation (Miami-Dade County hurricanes page). The county warns that hurricanes in Miami-Dade can cause power outages and communication failures that last days, weeks or even months.

The county page also offers Miami-Dade Alerts, which send emergency information by text message, separate from the city ALERTMIAMI texts (Miami-Dade County hurricanes page). The Miami emergency services guide covers who answers which call.

The Miami weather section does not yet have deeper pages of its own, so this hub answers the climate questions directly and sends storm, flood and sea level questions to the Miami safety and environment guides.

Each guide named in the table covers one Miami question in depth: the Miami hurricane evacuation zones guide for storm surge planning zones, the Miami flood risk zones guide for flood maps, the Miami sea level rise guide and the Biscayne Bay guide for the water around the city, and the Miami emergency services guide for fire rescue and emergency contacts. The monthly figures on this page come from the NOAA NCEI 1991-2020 normals, the official 30 year averages for the Miami station; the top 10 records come from the NWS Miami climate page, which labels its data preliminary, and the September 2026 figures from the NWS Miami monthly climate report.