This report describes the typical weather at the Miami International Airport (Miami, Florida, United States) weather station over the course of an average September 7. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Miami, Florida has a tropical monsoon climate with short dry season. The area within 25 mi of this station is covered by marshes (37%), oceans and seas (32%), built-up areas (13%), grasslands (11%), and croplands (6%).
The temperature typically varies from 79°F to 87°F and is rarely below 75°F or above 91°F.
The coolest hours of the day are from 1am to 9am with the coldest at 6am, at which time the temperature is below 80°F three days out of four.
The warmest hours of the day are from 11am to 5pm with the hottest at 1pm, at which time the temperature is above 85°F three days out of four.
The day has gained half its heat by 10am and lost it again by 8pm.
On September 7 the Sun rises at 7:03am and sets at 7:33pm.
Solar noon is at 1:19pm.
For reference, on the longest day of the year the Sun rises at 6:30am and sets at 8:15pm, while on the shortest day of the year it rises at 7:03am and sets at 5:35pm.
Astronomical twilight begins and ends 77 minutes before sunrise and after sunset at 5:46am and 8:51pm, respectively.
Nautical twilight begins and ends 49 minutes before sunrise and after sunset at 6:13am and 8:23pm, respectively.
Civil twilight begins and ends 23 minutes before sunrise and after sunset at 6:41am and 7:57pm, respectively.
Solar twilight begins and ends 30 minutes after sunrise and before sunset at 7:34am and 7:03pm, respectively.
The median cloud cover ranges from 48% (partly cloudy) to 82% (mostly cloudy).
At 4am, the clearest time of the day, the sky is clear, mostly clear, or partly cloudy 72% of the time, and overcast or mostly cloudy 27% of the time.
At 4pm, the cloudiest time of the day, the sky is overcast, mostly cloudy, or partly cloudy 84% of the time, and clear or mostly clear 14% of the time.
The sky is typically clearing in earnest by 11pm.
The clouds have typically started forming in earnest by 10am.
There is a 68% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.260". Among only those days for which there is at least some measured precipitation, the average is 0.459" and the total rarely exceeds 1.148".
When precipitation does occur it is most often in the form of thunderstorms (59% of days with precipitation have at worst thunderstorms), slight rain (18%), moderate rain (16%), and heavy rain (7%).
Precipitation is most likely around 4pm and least likely around 4am.
Either snow is exceptionally unlikely to fall at this location on September 7 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 66% (mildly humid) to 86% (very humid), rarely dropping below 55% (mildly humid), or exceeding 94% (very humid).
The air is driest at 2pm, at which time the relative humidity is less than 71% (humid) three days out of four; it is most humid at 6am, exceeding 82% (humid) three days out of four.
The dew point ranges from 73°F to 75°F with an average of 74°F, which feels muggy no matter what the relative humidity is.
For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65°F.
Sustained wind speeds typically vary from 5 mph to 11 mph (light breeze to gentle breeze) over the course of the day.
The peak sustained wind speed typically occurs around 2pm and is rarely outside the range 6 mph to 16 mph (light breeze to moderate breeze).
The wind is most calm around 6am, rarely exceeding 9 mph (gentle breeze).
The wind is most often out of the east (30% of the time), south east (17% of the time), and north east (10% of the time). The wind is least often out of the south west (5% of the time), west (5% of the time), and north west (5% of the time).