Your September weather guide
HotWeather in Florida in September
Florida in September suits travellers who want hot weather and warm swimming water, but can work around frequent rain. Daytime temperatures average about 30°C, nights stay near 24°C, and around 20 days have measurable rain. It is a substantial change from September in the UK, without being a reliable choice for clear skies. Go if warmth matters more than dry weather; choose another month if rain would spoil your plans.
Long-term climate averages for Orlando, not a forecast · 1991-2020
Florida, month by month
Your snapshot
At a glance
The useful details for Orlando.
- Average daytime high
- 29.6°C
- 9 in 10 days stay below 31°C
- Average night-time low
- 24.3°C
- coldest 10% of nights: 23°C or lower
- Compared with London
- +11.0°C
- London averages 18.6°C in September
- Sea temperature
- 29.3°C
- year to year: 29°C to 30°C
- Sunshine per day (est.)
- 4.4h
- 36% of 12.1 h of daylight
- Rainy days (1 mm+)
- 20
- 152 mm over the month
- Humidity
- 82%
- Days over 25°C
- 100%
- 40% over 30°C
- Record high 1991-2020
- 33.7°C
- 2019-09-17
- Record low 1991-2020
- 17.6°C
- 2001-09-17
- Flight from London
- ≈ 9 h 30 min
- 6988 km, long-haul (estimate for a direct flight)
Records are observed extremes within 1991-2020, not typical holiday conditions. Warm-day percentages are shares of days, not day counts.
How September compares
September is the 4th warmest month of the year in Florida. Within United States it is 3rd of 6 (United States in September). Against London's average high of 18.6°C in September, Florida is 11.0°C warmer by day and 13.1°C warmer at night.
Daytime and night-time in September
The typical September day in Florida peaks at 29.6°C, but that is an average: the warmest 10% of days reach 31.1°C or more. About 100% of days top 25°C and 1 in 2 pass 30°C. Nights average 24.3°C; one night in ten drops to 22.9°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 33.7°C (2019-09-17) and the coldest night 17.6°C (2001-09-17).
Rain in September
Wet (more than 8 rainy days): about 20 days with 1 mm or more, 152 mm in total. Year to year it varies a lot - the wettest September was 2004 with 377 mm, the driest 1991 with 52 mm. Humidity averages 82%, which makes the heat feel heavier than the thermometer suggests.
Sea temperature in September
The sea averages 29.3°C - warm enough to swim (22°c+). Depending on the year it ranges from 28.9°C to 29.8°C. For the warmest sea here, come in August (29.9°C).
Sunshine and daylight
Around 4.4 hours of sunshine a day (estimated from cloud cover), 12.1 hours of daylight: the sun rises about 07:11 and sets about 19:31 local time in mid-September. Average cloud cover is 64%.
Is September a good time to visit Florida?
It is a reasonable choice: hot days but expect showers. The best months for Florida on our scoring are March, April, November; months averaging 25°C or more: Apr, May, Jun, Jul, Aug, Sep, Oct, Nov.
Hot days, warm nights and comfortable swimming
Pack for heat that carries on after sunset, rather than expecting evenings to bring much relief. Humidity averages 82%, so loose, breathable clothes are a more practical choice than heavy fabrics. Days reach 30°C on 40% of occasions, making a flexible pace and breaks from the midday heat sensible. If you find sticky weather tiring, leave room for indoor breaks rather than filling every day with outdoor plans. The sea averages 29.3°C, comfortably warm for swimming, though it may feel less refreshing than you expect. For travellers who dislike cool water and chilly evenings, that warmth is September's main advantage.
Plan around rain, not uninterrupted sunshine
Rain is the main compromise: about 20 days receive at least 1 mm, so a waterproof layer and a sheltered alternative belong in your plans. That does not mean every wet day is a washout, but it does make a rigid outdoor schedule a poor fit. Sunshine averages about 4.4 hours within 12.1 hours of daylight, so long days should not be confused with consistently sunny ones. Keep swimming and other outdoor time flexible, and use the local forecast to decide when to head out. September is easier to enjoy if you can change plans without feeling that the weather has wasted the day.
A little perspective
Florida through the year
September is highlighted. See how it compares with the rest of the year.
| Month | Day | Night | Sea | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| January | 21.9°C | 14.6°C | 23.9°C | 5.1 | 54 | 7 | 25% |
| February | 23.1°C | 15.6°C | 23.7°C | 5.8 | 46 | 7 | 38% |
| Marchbest | 24.9°C | 16.9°C | 24.2°C | 6.4 | 56 | 7 | 56% |
| Aprilbest | 27.1°C | 19.3°C | 25.4°C | 7.1 | 56 | 8 | 81% |
| May | 29.1°C | 21.7°C | 26.8°C | 7.4 | 86 | 11 | 97% |
| June | 30.1°C | 24.1°C | 28.5°C | 5.1 | 160 | 20 | 100% |
| July | 30.8°C | 24.9°C | 29.5°C | 5.1 | 138 | 21 | 100% |
| August | 30.6°C | 25.0°C | 29.9°C | 4.7 | 160 | 23 | 100% |
| SeptemberSelected | 29.6°C | 24.3°C | 29.3°C | 4.4 | 152 | 20 | 100% |
| October | 27.7°C | 21.9°C | 28.0°C | 5.5 | 95 | 13 | 91% |
| Novemberbest | 25.1°C | 18.6°C | 26.3°C | 5.5 | 48 | 7 | 62% |
| December | 23.0°C | 16.2°C | 24.9°C | 5.1 | 48 | 7 | 38% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
- Sea
Best months here
On warmth, low rainfall and sunshine, start with these.
Keep exploring
Similar in September
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
Mexico · 30°C by day · sea 29°C
Tulum
Mexico · 30°C by day · sea 29°C
Playa del Carmen
Cuba · 30°C by day · sea 29°C
Varadero
Mexico · 29°C by day · sea 29°C
Cancun
St Lucia · 29°C by day · sea 29°C
St Lucia
A little more detail
Florida in September FAQs
Plain answers, grounded in the averages.
Is Florida hot in September?
Florida is hot in September: the average daytime high is 29.6°C and nights average 24.3°C. About 100% of September days reach 25°C or more.
Can you swim in the sea in Florida in September?
The sea around Florida averages 29.3°C in September, which is warm enough for most people to swim comfortably. Between 1991 and 2020 it ranged from 29°C to 30°C depending on the year.
How much does it rain in Florida in September?
Florida sees about 20 rainy days (1 mm or more) and 152 mm of rain in a typical September. The wettest September between 1991 and 2020 was 2004 (377 mm) and the driest was 1991 (52 mm).
How sunny is Florida in September?
Florida gets around 4.4 hours of sunshine a day in September out of 12.1 hours of daylight (estimated from average cloud cover).
How does Florida compare with the UK in September?
Florida is on average 11.0°C warmer than London by day in September (29.6°C against 18.6°C).
What is the hottest September on record in Florida?
Between 1991 and 2020 the hottest September day in Florida reached 33.7°C on 2019-09-17, and the coldest night dropped to 17.6°C on 2001-09-17.
How much hotter is Florida than London in September?
Florida's average daytime high is 29.6°C, compared with 18.6°C in London - a difference of 11°C. Expect a marked step up in warmth, with nights averaging 24.3°C rather than offering a cool break from the daytime heat.
Is September the best month to go for the weather?
Not for the best overall balance. March, April and November are stronger weather choices. September makes more sense if hot days and warm sea temperatures are your priorities, and you are comfortable keeping plans flexible around frequent rain.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid) and NOAA Coral Reef Watch 5 km sea temperatures, 1991-2020
Averages computed from daily values at Orlando. Sea temperature from the nearest 5 km sea cell, 2 km from that point. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C