Indianapolis, Indiana Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Indianapolis weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——87°57°—
- FridayJun 5Overcast10%—88°65°+1°
- SaturdayJun 6Light Showers59%—83°64°-5°
- SundayJun 7Showers59%0.02″85°68°+2°
- MondayJun 8Light Showers24%—81°70°-4°
- TuesdayJun 9Drizzle25%0.06″73°69°-8°
- WednesdayJun 10Heavy Drizzle23%0.04″80°69°+7°
PM2.5 at 7.5 µg/m³ (AQI 42) with a 0.93 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust. AQI down 11 over the last 6 hours (steady decline since this morning).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 35 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 16 by mid-afternoon.
- Present
- AQI 35
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 16
PM × Wind × Precip
PM2.5 at 7.5 µg/m³ (AQI 42) with a 0.93 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.93
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:12 AM
- Moonset
- 1:46 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Indianapolis at a glance
- Today vs. normal: 10°F below the seasonal normal for this latitude
- Last frost: April 15 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Indianapolis
SPC has placed Indianapolis in the General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
July brings Indianapolis its warmest temperatures at around 74°F mean, while January delivers the coldest at roughly 27°F. June sees peak rainfall with 5.4 inches, compared to February's low of 2.3 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 27° | 3.1″ | 6 |
| February | 30° | 2.3″ | 5 |
| March | 40° | 3.7″ | 8 |
| April | 52° | 4.5″ | 8 |
| May | 62° | 5.0″ | 9 |
| June | 71° | 5.4″ | 8 |
| July | 74° | 3.9″ | 6 |
| August | 73° | 3.6″ | 5 |
| September | 66° | 3.2″ | 5 |
| October | 54° | 3.2″ | 6 |
| November | 42° | 3.4″ | 6 |
| December | 32° | 3.3″ | 7 |
Regional context
Indianapolis falls within a humid subtropical climate region that shares temperature ranges, seasonal patterns, and growing conditions with other nearby cities.
Similar climates: Evansville, IN, Lafayette, IN, Bloomington, IN, Fishers, IN, Carmel, IN.
Naturalist notes
By late May, American robins have typically finished their second broods in Indianapolis, with fledglings learning to forage in suburban lawns.
Wild bergamot begins blooming in June across central Indiana's prairies and woodland edges, attracting native bees and butterflies.
Frequently asked
- When does it freeze in Indianapolis?
- Spring's final frost in Indianapolis typically occurs around mid-April, while the first fall frost returns around mid-November.
- What is the rainy season in Indianapolis?
- June brings the heaviest rainfall with approximately 5.4 inches on average, contributing to the city's annual total of roughly 45 inches.
- What is the warmest month in Indianapolis?
- July typically records the warmest temperatures, averaging about 74°F.
- What is the coldest month in Indianapolis?
- January typically brings the coldest weather, averaging about 27°F.
- When can I start a vegetable garden in Indianapolis?
- Cool-season crops like peas and lettuce can be planted around the last spring frost in mid-April, while warm-season crops such as tomatoes and peppers should wait 1–2 weeks after.
- How many rainy days does Indianapolis get?
- Indianapolis experiences about 79 rainy days per year on average.
- What hardiness zone is Indianapolis?
- Indianapolis's USDA hardiness zone depends on its lowest average winter temperature; the USDA's online lookup tool using the city ZIP provides the current zone designation.
Climate
Indianapolis, Indiana experiences a humid subtropical climate zone. Winter temperatures in January hover near 27°F, while July averages reach 74°F — creating a 47°F seasonal swing.
Annual precipitation totals about 45 inches across roughly 79 rainy days throughout the year.
Weather patterns here follow the city's latitude of 39.8°N, along with proximity to large water bodies and local elevation. These factors determine growing seasons, frost timing, and daily weather conditions.