Indianapolis, Indiana Weather
Thunder quiets the land. Day 93 of summer. Read this microseason across nine climate regions →
Indianapolis weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 10:19 AM EDT · Open-Meteo
- TodaySep 21Overcast80%0.32″66°57°—
- TuesdaySep 22Overcast——64°58°-2°
- WednesdaySep 23Overcast——63°58°-1°
- ThursdaySep 24Overcast——70°59°+7°
- FridaySep 25Overcast——72°57°+2°
- SaturdaySep 26Overcast——61°57°-11°
- SundaySep 27Light Drizzle——77°59°+16°
Air quality now AQI 42 · Good
AQI 42 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±4 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- 5:16 PM
- Moonset
- 2:06 AM
- In sign
- ♑︎ Capricorn
Thunder quiets the land
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Indianapolis at a glance
- Today vs. normal: Today averages 62°F (high 66°F, low 57°F), 5°F below the 67°F normal for Sep 21
- Last frost: April 20 (1991–2020 median, NOAA station 10 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — Indianapolis
- Mon66°57°80%
- Tue64°58°2%
- Wed63°58°2%
- Thu70°59°1%
- Fri72°57°1%
- Sat61°57°1%
- Sun77°59°3%
- Mon81°61°9%
- Tue81°65°19%
- Wed77°65°20%
- Thu78°59°10%
- Fri78°59°19%
- Sat85°61°19%
- Sun70°56°20%
- Mon61°50°17%
- Tue60°45°23%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Indianapolis
Interactive wind and temperature map centered on Indianapolis — it loads in your browser. Open the full weather map.
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 21) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, and winter squash.
SPC Convective Outlook
Storm Prediction Center — Indianapolis
SPC includes Indianapolis in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook.
Sun & seasons in Indianapolis
Indianapolis sits in Marion County, where the year’s longest day runs 14h 59m of daylight and its shortest just 9h 21m — a swing of +5h 39m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Indianapolis is the state’s largest city. The nearest town Indianapolis tracks is Danville, roughly 19 miles to the W.
Air quality in Indianapolis
Air quality in Indianapolis’s county has held roughly steady since 2020; its cleanest year on record was 2024 (median AQI 54). See the full air-quality history for Indianapolis.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes | radishes |
| May | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, garlic |
| August | beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
A year in weather
July is Indianapolis's warmest stretch (~77°F) and January its coldest (~28°F); precipitation crests in May at 4.8 inches and ebbs in January to 2.5 inches.
| Month | Mean temp | Precip |
|---|---|---|
| January | 28° | 2.5″ |
| February | 31° | 2.7″ |
| March | 41° | 3.9″ |
| April | 53° | 4.3″ |
| May | 62° | 4.8″ |
| June | 72° | 3.8″ |
| July | 77° | 3.2″ |
| August | 76° | 2.9″ |
| September | 69° | 2.6″ |
| October | 57° | 2.9″ |
| November | 43° | 3.2″ |
| December | 31° | 3.5″ |
Regional context
Similar climates Spring Hill, IN, Wynnedale, IN, Warren Park, IN
By modelled 1991-2020 normals (EC_Earth3P_HR model via Open-Meteo), Indianapolis sees 28°F Januarys and 77°F Julys, a 49°F range, plus around 40.2 inches of precipitation.
No season owns Indianapolis's rain: May reaches 4.8 inches and January keeps 2.5 inches, an even spread through Indianapolis's year. That even rhythm groups Indianapolis with places like Spring Hill, IN, Wynnedale, IN and Warren Park, IN.
Indianapolis's growing window opens around April 20, once Indianapolis's overnight lows stop freezing — sow kale, peas, spinach, and parsnips. Hold Indianapolis's tender crops — tomatoes, peppers, basil — until 10-14 days past Indianapolis's last frost. It shuts near October 21, when freezes return to Indianapolis and tender plants need cover. Sheltered Indianapolis yards can escape a light frost.
Similar climates: Spring Hill, IN, Wynnedale, IN, Warren Park, IN, Rocky Ripple, IN, Beech Grove, IN.
Frequently asked
- When does it freeze in Indianapolis?
- In Indianapolis, expect the last spring frost near April 20; Indianapolis's first autumn frost comes around October 21.
- What is the rainy season in Indianapolis?
- May is the wettest month in Indianapolis, about 4.8 inches on average; the year totals roughly 40 inches.
- What is the warmest month in Indianapolis?
- July is Indianapolis's warmest month, averaging about 77°F.
- What is the coldest month in Indianapolis?
- Indianapolis bottoms out in January, with a mean near 28°F.
- When can I start a vegetable garden in Indianapolis?
- Time tomatoes in Indianapolis for two weeks after April 20; peas and greens start at Indianapolis's frost line.
- What hardiness zone is Indianapolis?
- Indianapolis's USDA zone comes from its January mean (28°F); enter the ZIP on the USDA lookup for the number.
- What is the 10-day forecast for Indianapolis?
- Indianapolis's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Indianapolis?
- See this week's day-by-day rain chances for Indianapolis in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Indianapolis?
- Current conditions for Indianapolis and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Indianapolis forecast updated?
- The Indianapolis forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Indianapolis?
- Today's sunrise and sunset times for Indianapolis are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Indianapolis?
- The next few days in Indianapolis's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Indianapolis sits at 39.8°N; its climate zone is humid subtropical (Köppen approximation).
ZIP codes in Indianapolis
- 46113
- 46183
- 46201
- 46202
- 46203
- 46204
- 46205
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