Weather in St. Louis in March

Shoulder season. March sits in between. You will get good days and you will lose some. Highs sit at 13.2 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

March ranks 8 of 12 in St. Louis: past the worst of the year but short of October, which is the month to book if the dates are open.

Rain on 11 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 13.2 °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: 14 nights fall below freezing. Across the twenty years measured, the hottest March day reached 26.9 °C and the coldest night fell to -14.3 °C, and the wettest single day dropped 97 mm — roughly 104% of the month's rain in one day.

March is moderately variable: 30 mm in the driest year against 243 mm in the wettest, around an average of 93 mm. Roughly two Marchs in three land near that average, and the third does something else entirely.

Wind is light at 10 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 78%, which at 13.2 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How March sits in the year

The month is on the way up: 7 °C warmer than February, and April adds another 6.4 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in March

11.9 hours of daylight, gaining 1.3 hours across the month. That is between St. Louis's extremes of 14.8 and 9.5 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 36.6 °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.

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

March in St. Louis versus nearby

If St. Louis is one option among several, the nearby comparison is worth making. Indianapolis is the weaker option in March — 3.1 °C cooler, 1 day less rain. Kansas City is close enough to be a coin toss — within a degree on temperature, 3 days less rain.

So: March is a compromise. October is 25 points better and is what St. Louis 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 St. Louis

See all twelve months in St. Louis, or where else to go in March.