Your September weather guide
HotWeather in Port El Kantaoui in September
September is a good choice for Port El Kantaoui if you want hot days and a sea that still feels warm, rather than mild sightseeing weather. Average daytime highs are 30°C, nights average 21°C, and the sea sits around 26.1°C. The catch is that the heat can still feel demanding, and rain is possible. It suits travellers happy to slow down at midday and keep their plans flexible when the weather turns.
Long-term climate averages for Port el Kantaoui, not a forecast · 1991-2020
Port El Kantaoui, month by month
Your snapshot
At a glance
The useful details for Port el Kantaoui.
- Average daytime high
- 30.0°C
- 9 in 10 days stay below 35°C
- Average night-time low
- 21.0°C
- coldest 10% of nights: 18°C or lower
- Compared with London
- +11.4°C
- London averages 18.6°C in September
- Sea temperature
- 26.1°C
- year to year: 26°C to 27°C
- Sunshine per day (est.)
- 7.9h
- 65% of 12.2 h of daylight
- Rainy days (1 mm+)
- 5
- 43 mm over the month
- Humidity
- 67%
- Days over 25°C
- 95%
- 46% over 30°C
- Record high 1991-2020
- 39.9°C
- 1994-09-14
- Record low 1991-2020
- 15.3°C
- 2004-09-29
- Flight from London
- ≈ 3 h 6 min
- 1902 km, short-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 Port El Kantaoui. Within Tunisia it is 2nd of 3 (Tunisia in September). Against London's average high of 18.6°C in September, Port El Kantaoui is 11.4°C warmer by day and 9.8°C warmer at night.
Daytime and night-time in September
The typical September day in Port El Kantaoui peaks at 30.0°C, but that is an average: the warmest 10% of days reach 34.5°C or more. About 95% of days top 25°C and 1 in 2 pass 30°C. Nights average 21.0°C; one night in ten drops to 18.3°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 39.9°C (1994-09-14) and the coldest night 15.3°C (2004-09-29).
Rain in September
Some rain (4-8 rainy days): about 5 days with 1 mm or more, 43 mm in total. Year to year it varies a lot - the wettest September was 1997 with 143 mm, the driest 1992 with 5 mm. Humidity averages 67%.
Sea temperature in September
The sea averages 26.1°C - warm enough to swim (22°c+). Depending on the year it ranges from 25.5°C to 26.8°C. For the warmest sea here, come in August (26.8°C).
Sunshine and daylight
Around 7.9 hours of sunshine a day (estimated from cloud cover), 12.2 hours of daylight: the sun rises about 06:00 and sets about 18:25 local time in mid-September. Average cloud cover is 35%.
Is September a good time to visit Port El Kantaoui?
Yes - it is one of the better months: hot days, manageable rain and long sunny days. The best months for Port El Kantaoui on our scoring are June, May, September; months averaging 25°C or more: May, Jun, Jul, Aug, Sep, Oct.
Expect heat, not just a warmer version of home
September still calls for summer clothing and a sensible approach to time outdoors. Around 46% of days reach 30°C, so this is not the month to choose if you want reliably gentle warmth. The hottest days can reach 34.5°C or more, making shade and breaks particularly useful around midday. Humidity averages 67%, which may add to the sticky feel. Plan more active outings for the cooler parts of the day and leave room to rest when it feels hot. Evenings usually need little more than light clothing, though a light layer is sensible for cooler nights rather than assuming every evening will stay warm.
Good swimming weather, with room for rain
The sea is a strong reason to choose September: at 26.1°C on average, it is comfortably in swimming territory rather than something to brave briefly. About 7.9 hours of sunshine a day also leaves useful scope for time outside, although that is not a promise of clear skies throughout your stay. There are about 5 rainy days during the month, so pack a light waterproof and avoid making every plan depend on dry weather. September is among the better-rated months here, alongside May and June. Choose it for warm-water swimming and summer heat, but not for a guarantee that rain will leave your holiday alone.
A little perspective
Port El Kantaoui 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 | 16.4°C | 7.9°C | 15.8°C | 5.6 | 29 | 5 | 0% |
| February | 17.0°C | 8.0°C | 14.6°C | 6.3 | 24 | 5 | 2% |
| March | 19.6°C | 9.8°C | 14.8°C | 6.9 | 40 | 6 | 8% |
| April | 22.3°C | 12.1°C | 16.1°C | 7.6 | 25 | 6 | 20% |
| Maybest | 26.3°C | 15.4°C | 18.8°C | 8.9 | 17 | 4 | 62% |
| Junebest | 30.4°C | 19.0°C | 22.3°C | 11.1 | 7 | 2 | 95% |
| July | 33.5°C | 21.8°C | 25.4°C | 12.9 | 2 | 0 | 100% |
| August | 33.8°C | 22.7°C | 26.8°C | 11.4 | 9 | 2 | 100% |
| SeptemberSelectedbest | 30.0°C | 21.0°C | 26.1°C | 7.9 | 43 | 5 | 95% |
| October | 26.1°C | 17.6°C | 23.9°C | 6.4 | 44 | 6 | 62% |
| November | 21.2°C | 13.0°C | 21.1°C | 5.8 | 28 | 5 | 11% |
| December | 17.5°C | 9.3°C | 18.1°C | 5.6 | 27 | 5 | 1% |
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.
A little more detail
Port El Kantaoui in September FAQs
Plain answers, grounded in the averages.
Is Port El Kantaoui hot in September?
Port El Kantaoui is hot in September: the average daytime high is 30.0°C and nights average 21.0°C. About 95% of September days reach 25°C or more.
Can you swim in the sea in Port El Kantaoui in September?
The sea around Port El Kantaoui averages 26.1°C in September, which is warm enough for most people to swim comfortably. Between 1991 and 2020 it ranged from 26°C to 27°C depending on the year.
How much does it rain in Port El Kantaoui in September?
Port El Kantaoui sees about 5 rainy days (1 mm or more) and 43 mm of rain in a typical September. The wettest September between 1991 and 2020 was 1997 (143 mm) and the driest was 1992 (5 mm).
How sunny is Port El Kantaoui in September?
Port El Kantaoui gets around 7.9 hours of sunshine a day in September out of 12.2 hours of daylight (estimated from average cloud cover).
How does Port El Kantaoui compare with the UK in September?
Port El Kantaoui is on average 11.4°C warmer than London by day in September (30.0°C against 18.6°C).
What is the hottest September on record in Port El Kantaoui?
Between 1991 and 2020 the hottest September day in Port El Kantaoui reached 39.9°C on 1994-09-14, and the coldest night dropped to 15.3°C on 2004-09-29.
How much warmer is it than London in September?
Port El Kantaoui averages a daytime high of 30°C, compared with 18.6°C in London. That is a difference of 11.4°C: enough to plan for proper heat rather than simply taking your usual September clothes and leaving the coat behind.
Will I need a jacket in the evenings?
With an average night low of 21°C, light clothing will often be enough. A light layer is still useful: the coldest 10% of nights fall to 18.3°C or lower, so not every evening will feel equally warm.
Is September suitable if I dislike very hot weather?
It may be hotter than you would like. Around 95% of days reach 25°C and 46% reach 30°C. If heat makes you uncomfortable, expect to rely on shade and cooler parts of the day rather than finding consistently mild conditions.
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 Port el Kantaoui. Sea temperature from the nearest 5 km sea cell, 2.6 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