Weather in Edinburgh in September

Shoulder season. September is shoulder season in Edinburgh — cheaper, quieter, and a genuine gamble. Highs average 15.8 °C, lows 9.5 °C, and rain falls on 14 days — nothing in the month is working against you.

September ranks 2 of 12 in Edinburgh. Only August scores clearly higher, and the difference is small enough to be settled by price rather than weather.

This is persistent light rain rather than storms: 14 wet days but only 1 heavy ones. It rarely cancels anything outright, and it rarely fully clears either. A jacket beats an umbrella. Pack for 15.8 °C days and 9.5 °C nights; the spread matters more here than any single number.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest September day reached 22.6 °C and the coldest night fell to 2.9 °C, and the wettest single day dropped 33 mm — roughly 52% 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 104 mm against 22 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 64 mm average is a reasonable planning figure, not a promise.

Wind is light at 13.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 87%, high enough to notice on the warm days without dominating them.

How September sits in the year

The month is on the way down: 1.9 °C cooler than August, with October dropping another 3.5 °C. The first week and the last are not the same trip.

Daylight in September

12.9 hours of daylight, losing 2.3 hours across the month. That is between Edinburgh's extremes of 17.6 and 7 hours, so days are long enough not to constrain the plan.

An inland climate

Despite being inland, the year stays fairly even: 16.3 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, April is the trade worth considering — 14 points weaker on weather, and materially quieter.

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

September in Edinburgh versus nearby

If Edinburgh is one option among several, the nearby comparison is worth making. Glasgow is the weaker option in September — within a degree on temperature, 4 days more rain. Manchester is close enough to be a coin toss — within a degree on temperature, 1 day more rain.

So: September is effectively as good as it gets here — 0 points behind August, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Edinburgh

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