Climate averages 1991–2020
Indianapolis weather
in October.
A mild, moderately wet month: the 6th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a mild month in Indianapolis: daytime highs average 17.7°C and nights cool to about 8.9°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 83 mm of rain on roughly 8 days, which makes October a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 11 min on an average October day.
The nearest other city in this atlas is Carmel (24 km away). In October its highs average 17.5°C, about as warm as Indianapolis, with 83 mm of rain.
Among the 498 cities listed in the United States, Indianapolis ranks joint 329th of 498 for the warmest October highs and joint 276th of 498 for the driest October (rainfall, lowest first). The mean October high of those 498 cities is 21.4°C; Indianapolis is 3.7°C cooler than that mean.
From October to November, average highs fall by 7.5°C to 10.2°C, and monthly rainfall rises from 83 mm to 87 mm.
The annual picture
October in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Indianapolis climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.9°C-6.0°C | -6.0°C | 80 | 9.2 | 9.710 h |
| February | 4.4°C-4.5°C | -4.5°C | 66 | 8.6 | 10.711 h |
| March | 10.1°C0.4°C | 0.4°C | 97 | 11.1 | 11.912 h |
| April | 16.8°C6.5°C | 6.5°C | 120 | 12.0 | 13.213 h |
| May | 22.0°C12.4°C | 12.4°C | 122 | 13.4 | 14.314 h |
| June | 26.7°C17.5°C | 17.5°C | 107 | 11.8 | 14.915 h |
| July | 28.5°C19.5°C | 19.5°C | 90 | 11.5 | 14.715 h |
| August | 28.0°C18.9°C | 18.9°C | 72 | 8.9 | 13.714 h |
| September | 24.6°C15.2°C | 15.2°C | 72 | 7.6 | 12.512 h |
| October, selected | 17.7°C8.9°C | 8.9°C | 83 | 8.4 | 11.211 h |
| November | 10.2°C2.5°C | 2.5°C | 87 | 8.8 | 10.010 h |
| December | 4.2°C-2.9°C | -2.9°C | 78 | 9.9 | 9.49 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
October in nearby cities
- Carmel in OctoberUnited States · 24 kmHigh 17.5°C · Low 8.6°C · 83 mm rain
- Fishers in OctoberUnited States · 24 kmHigh 17.6°C · Low 8.6°C · 83 mm rain
- Bloomington (Indiana), United States in OctoberUnited States · 74 kmHigh 18.5°C · Low 9.5°C · 83 mm rain
- Muncie in OctoberUnited States · 81 kmHigh 17.2°C · Low 8.2°C · 80 mm rain
- Lafayette (Indiana), United States in OctoberUnited States · 94 kmHigh 17.7°C · Low 8.5°C · 79 mm rain
- Cincinnati in OctoberUnited States · 158 kmHigh 18.4°C · Low 8.9°C · 75 mm rain
- Dayton in OctoberUnited States · 168 kmHigh 17.6°C · Low 9.0°C · 74 mm rain
- Louisville in OctoberUnited States · 172 kmHigh 19.9°C · Low 10.2°C · 85 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Indianapolis) is explained once on the Indianapolis year overview and on the Sources, method and limits page.