Weather in Indianapolis in April

A good month. April works. It is not the peak, but nothing about it fights you. Highs average 17.2 °C, lows 5.2 °C, and rain falls on 11 days — nothing in the month is working against you.

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

Rain on 11 days, 4 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 17.2 °C days and 5.2 °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: 6 nights fall below freezing. Across the twenty years measured, the hottest April day reached 27.5 °C and the coldest night fell to -5.7 °C, and the wettest single day dropped 60 mm — roughly 54% of the month's rain in one day.

April is moderately variable: 39 mm in the driest year against 233 mm in the wettest, around an average of 111 mm. Roughly two Aprils in three land near that average, and the third does something else entirely.

Wind is light at 13.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 78%, high enough to notice on the warm days without dominating them.

How April sits in the year

The month is on the way up: 7.1 °C warmer than March, and May adds another 5.1 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in April

13.2 hours of daylight, gaining 1.2 hours across the month. That is between Indianapolis's extremes of 15 and 9.4 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 35.6 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

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

April in Indianapolis versus nearby

If Indianapolis is one option among several, the nearby comparison is worth making. Louisville is close enough to be a coin toss — within a degree on temperature, 2 days more rain. Fort Wayne is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: April works, with September the better month by 15 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Indianapolis

See all twelve months in Indianapolis, or where else to go in April.