Weather in Durban in September

Prime time. If you get to pick your dates, September is the one. Highs average 21.5 °C, lows 19.2 °C, and rain falls on 9 days — nothing in the month is working against you.

September ranks 5 of 12 in Durban: past the worst of the year but short of June, which is the month to book if the dates are open.

Rain on 9 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average September reaches 30 °C; the day barely swings — 2.3 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 31.4 °C and the coldest night fell to 15.6 °C, and the wettest single day dropped 107 mm — roughly 165% of the month's rain in one day.

This is the volatile part. September rainfall has ranged from 9 mm to 288 mm across the twenty years measured — a 279 mm spread around an average of 65 mm. The average is real but almost no individual September looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind sits around 22 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 78%, high enough to notice on the warm days without dominating them.

How September sits in the year

Temperatures hold steady either side: 21.2 °C in August, 21.5 here, 21.9 in October. Nothing about the timing within the month matters much. Rain is the thing that moves: October brings 5 days more of it, so the earlier half of a flexible trip is the safer half.

Daylight in September

11.9 hours of daylight, gaining 0.9 hours across the month. That is between Durban's extremes of 14 and 10.2 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 22.2 °C in September — comfortable for a proper swim. The sea peaks at 26.9 °C in February and bottoms out at 22 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself. September is the value pick for Durban: it scores within 10 points of June without carrying June's prices.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

September in Durban versus nearby

If Durban is one option among several, the nearby comparison is worth making. Pietermaritzburg is close enough to be a coin toss — 4.4 °C warmer, 1 day more rain. Johannesburg is a better bet in September — 3.9 °C warmer, 7 days less rain.

So: September works, with June the better month by 10 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Durban

See all twelve months in Durban, or where else to go in September.