Weather in Devonport in September

Shoulder season. September sits in between. You will get good days and you will lose some. Highs sit at 13 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

September ranks 10 of 12 — near the bottom of Devonport's year. February is the month that works, and the swing between the two is 44 points, which is a different holiday rather than a slightly better one.

Rain on 13 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 13 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 3.7 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 16.5 °C and the coldest night fell to 5.4 °C, and the wettest single day dropped 70 mm — roughly 78% of the month's rain in one day.

September is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest September on record still delivered 171 mm against 27 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 90 mm average is a reasonable planning figure, not a promise.

Wind is light at 14.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 81%, which at 13 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How September sits in the year

Temperatures hold steady either side: 12.1 °C in August, 13 here, 14.2 in October. Nothing about the timing within the month matters much.

Daylight in September

11.8 hours of daylight, gaining 1.3 hours across the month. That is between Devonport's extremes of 15.1 and 9.2 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 12.5 °C in September — too cold to swim without a wetsuit. The sea peaks at 18.3 °C in February and bottoms out at 12.5 °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

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

September in Devonport versus nearby

If Devonport is one option among several, the nearby comparison is worth making. Burnie is close enough to be a coin toss — within a degree on temperature, 5 days more rain. Launceston is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: September is a compromise. February is 36 points better and is what Devonport is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Devonport

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