Weather in Amarillo in September

A good month. September is a solid month to be in Amarillo. Highs average 29.4 °C, lows 15.2 °C, and rain falls on 8 days — nothing in the month is working against you.

September ranks 6 of 12 in Amarillo: past the worst of the year but short of April, which is the month to book if the dates are open.

Rain on 8 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 29.4 °C days and 15.2 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 14 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest September day reached 38 °C and the coldest night fell to 2.4 °C, and the wettest single day dropped 35 mm — roughly 71% of the month's rain in one day.

September is moderately variable: 9 mm in the driest year against 106 mm in the wettest, around an average of 49 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 11.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 55%.

How September sits in the year

The month is on the way down: 3.9 °C cooler than August, with October dropping another 6.5 °C. The first week and the last are not the same trip.

Daylight in September

12.5 hours of daylight, losing 1.1 hours across the month. That is between Amarillo's extremes of 14.5 and 9.8 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 37.1 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage. At 1118 m the air is thin enough to matter — sun that burns faster than the temperature suggests, and nights that cool off quickly. Within September itself the daily swing is 14.2 °C, so mornings and afternoons need different clothes.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself.

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

September in Amarillo versus nearby

If Amarillo is one option among several, the nearby comparison is worth making. Lubbock is close enough to be a coin toss — within a degree on temperature, 1 day more rain. Oklahoma City is close enough to be a coin toss — within a degree on temperature, 1 day more rain.

So: September works, with April the better month by 17 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Amarillo

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