Weather in Oklahoma City in September

A good month. September works. It is not the peak, but nothing about it fights you. Highs average 29.7 °C, lows 17.7 °C, and rain falls on 9 days — nothing in the month is working against you.

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

Rain on 9 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 29.7 °C days and 17.7 °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: 15 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest September day reached 40.7 °C and the coldest night fell to 6.5 °C, and the wettest single day dropped 70 mm — roughly 91% 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 162 mm against 25 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 77 mm average is a reasonable planning figure, not a promise.

Wind is light at 10.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 64%.

How September sits in the year

The month is on the way down: 4.3 °C cooler than August, with October dropping another 6.6 °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 Oklahoma City'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 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

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 Oklahoma City: it scores within 14 points of April without carrying April's prices.

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

September in Oklahoma City versus nearby

If Oklahoma City is one option among several, the nearby comparison is worth making. Tulsa is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Wichita is close enough to be a coin toss — within a degree on temperature, 2 days less rain.

So: September works, with April the better month by 14 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Oklahoma City

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