Seymour, Indiana Weather
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Climate of Seymour: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), August is usually the hottest month in Seymour, with average daytime highs around 29°C. January is the coolest, when nights typically fall to about -6°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 35°C, so the seasons feel very different from each other.
The area receives about 1230 mm of rain in a typical year. Most of it falls from March to July, October and December (around 65% of the yearly total), and May is the wettest month at roughly 131 mm.
For outdoor plans and travel, August to September usually offer the most comfortable weather in Seymour, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 3° | -6° | 83 mm | 86% |
| Feb | 5° | -5° | 80 mm | 85% |
| Mar | 11° | 0° | 108 mm | 82% |
| Apr | 18° | 6° | 125 mm | 79% |
| May | 23° | 12° | 131 mm | 80% |
| Jun | 27° | 17° | 124 mm | 79% |
| Jul | 29° | 19° | 113 mm | 77% |
| Aug | 29° | 18° | 86 mm | 72% |
| Sep | 26° | 14° | 88 mm | 70% |
| Oct | 19° | 7° | 103 mm | 73% |
| Nov | 12° | 1° | 93 mm | 79% |
| Dec | 5° | -3° | 100 mm | 86% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Seymour. Values describe typical conditions, not a forecast.
About Seymour weather
Seymour, in Indiana's humid continental climate, typical of the US Midwest, is positioned about 93 km south of Indianapolis. The warmer months mean warm, humid summers (June–August). Finally, there's cold winters (December–February) with regular snow. This page shows live, auto-refreshing weather for Seymour: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Indiana/Indianapolis.
Frequently asked questions
Seymour is about 93 km south of Indianapolis, in Indiana.
Seymour sees cold winters (December–February) with regular snow.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Seymour's exact coordinates. No fixed schedule, the page updates whenever you load it.
August is usually the hottest month in Seymour, with average daytime highs of about 29°C and nights around 18°C.
The coldest nights come in January, when the average low is about -6°C and daytime highs reach around 3°C. Frost is possible on clear, calm nights.
Seymour receives about 1230 mm of rain in a typical year. May is the wettest month at roughly 131 mm, and the main rainy period is March to July, October and December.
August to September usually offer the most comfortable weather in Seymour, with mild daytime temperatures and little rain.
In November Seymour typically sees daytime highs near 12°C and lows near 1°C, with about 93 mm of rain over the month and average humidity around 79%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Seymour updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Seymour's day-to-day weather follows the broader pattern of Indiana described above. See the hourly weather forecast or the air quality index for more detail.