Weather in Laredo in September

A hard month. September asks something of you. Go in knowing what. Highs average 33.8 °C, lows 22.9 °C, and rain falls on 13 days — nothing in the month is working against you.

September ranks 9 of 12 in Laredo: past the worst of the year but short of February, which is the month to book if the dates are open.

Rain on 13 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 33.8 °C days and 22.9 °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: 11 days clear 35 °C, so a serious heatwave is normal rather than notable. Across the twenty years measured, the hottest September day reached 42.5 °C and the coldest night fell to 12.9 °C, and the wettest single day dropped 74 mm — roughly 66% of the month's rain in one day.

September is moderately variable: 30 mm in the driest year against 249 mm in the wettest, around an average of 112 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 10.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 68%.

How September sits in the year

The month is on the way down: 4 °C cooler than August, with October dropping another 2.7 °C. The first week and the last are not the same trip. Rain is the thing that moves: October brings 7 days less of it, so pushing the dates later buys drier weather.

Daylight in September

12.4 hours of daylight, losing 0.8 hours across the month. That is between Laredo's extremes of 13.9 and 10.4 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 29.9 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

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 Laredo versus nearby

If Laredo is one option among several, the nearby comparison is worth making. Corpus Christi is close enough to be a coin toss — within a degree on temperature, 1 day more rain. Monterrey is close enough to be a coin toss — within a degree on temperature, 3 days more rain.

So: September is a compromise. February is 50 points better and is what Laredo 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 Laredo

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