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July Weather in Indianapolis Indiana, United States

Daily high temperatures are around 85°F, rarely falling below 77°F or exceeding 92°F. The highest daily average high temperature is 85°F on July 19.

Daily low temperatures are around 67°F, rarely falling below 59°F or exceeding 74°F. The highest daily average low temperature is 68°F on July 20.

For reference, on July 18, the hottest day of the year, temperatures in Indianapolis typically range from 68°F to 85°F, while on January 29, the coldest day of the year, they range from 22°F to 36°F.

Average High and Low Temperature in July in Indianapolis

Average High and Low Temperature in July in IndianapolisJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313150°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°FJunAugJul 1885°FJul 1885°F68°F68°FJul 184°FJul 184°F67°F67°FJul 3184°FJul 3184°F67°F67°FJul 1185°FJul 1185°F67°F67°F
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in July in Indianapolis

Average Hourly Temperature in July in IndianapolisJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMJunAugcoolcoolcomfortablecomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Groznyy, Russia (5,965 miles away) and Chuncheon, South Korea (6,666 miles) are the far-away foreign places with temperatures most similar to Indianapolis (view comparison).

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The month of July in Indianapolis experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 39% to 33%.

The clearest day of the month is July 30, with clear, mostly clear, or partly cloudy conditions 68% of the time.

For reference, on December 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 59%, while on August 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%.

Cloud Cover Categories in July in Indianapolis

Cloud Cover Categories in July in IndianapolisJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugJul 161%Jul 161%Jul 3167%Jul 3167%Jul 1162%Jul 1162%Jul 2165%Jul 2165%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Indianapolis, the chance of a wet day over the course of July is essentially constant, remaining around 39% throughout.

For reference, the year's highest daily chance of a wet day is 42% on June 25, and its lowest chance is 20% on January 29.

Probability of Precipitation in July in Indianapolis

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during July in Indianapolis is decreasing, starting the month at 3.9 inches, when it rarely exceeds 6.8 inches or falls below 1.9 inches, and ending the month at 3.1 inches, when it rarely exceeds 4.8 inches or falls below 1.6 inches.

Average Monthly Rainfall in July in Indianapolis

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of July in Indianapolis, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 41 minutes, implying an average daily decrease of 1 minute, 22 seconds, and weekly decrease of 9 minutes, 34 seconds.

The shortest day of the month is July 31, with 14 hours, 15 minutes of daylight and the longest day is July 1, with 14 hours, 56 minutes of daylight.

Hours of Daylight and Twilight in July in Indianapolis

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month in Indianapolis is 6:20 AM on July 1 and the latest sunrise is 23 minutes later at 6:43 AM on July 31.

The latest sunset is 9:16 PM on July 1 and the earliest sunset is 18 minutes earlier at 8:58 PM on July 31.

Daylight saving time is observed in Indianapolis during 2024, but it neither starts nor ends during July, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 6:16 AM and sets 14 hours, 59 minutes later, at 9:16 PM, while on December 21, the shortest day of the year, it rises at 8:02 AM and sets 9 hours, 21 minutes later, at 5:23 PM.

Sunrise & Sunset with Twilight in July in Indianapolis

The solar day over the course of July. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in July in Indianapolis

Solar Elevation and Azimuth in July in IndianapolisJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMJunAug001010202020303040405050506060700001010202030303040405050606070
northeastsouthwest
Solar elevation and azimuth over the course of July 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for July 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in July in Indianapolis

Moon Rise, Set & Phases in July in IndianapolisJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMJunAugJun 68:38 AMJun 68:38 AMJun 219:09 PMJun 219:09 PMJul 56:58 PMJul 56:58 PMJul 216:18 AMJul 216:18 AMAug 47:14 AMAug 47:14 AMAug 192:26 PMAug 192:26 PM5:54 AM5:54 AM9:58 PM9:58 PM9:34 PM9:34 PM6:22 AM6:22 AM5:34 AM5:34 AM9:40 PM9:40 PM9:10 PM9:10 PM6:24 AM6:24 AM6:39 AM6:39 AM9:26 PM9:26 PM8:54 PM8:54 PM7:53 AM7:53 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Jul 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
22%2:35 AMENE5:19 PMWNW-9:52 AMS232,196 mi
2
13%3:08 AMENE6:33 PMWNW-10:46 AMS233,682 mi
3
6%3:48 AMNE7:44 PMNW-11:42 AMS235,492 mi
4
2%4:37 AMNE8:47 PMNW-12:41 PMS237,605 mi
5
0%5:34 AMNE9:40 PMNW-1:39 PMS239,960 mi
6
1%6:38 AMNE10:23 PMWNW-2:34 PMS242,448 mi
7
4%7:45 AMENE10:57 PMWNW-3:25 PMS244,919 mi
8
8%8:52 AMENE11:25 PMWNW-4:12 PMS247,202 mi
9
15%9:56 AMENE11:48 PMWNW-4:55 PMS249,117 mi
10
23%10:57 AMENE--5:36 PMS250,495 mi
11
31%-12:09 AMW11:57 AME6:15 PMS251,195 mi
12
41%-12:28 AMW12:56 PME6:53 PMS251,116 mi
13
50%-12:48 AMW1:55 PME7:32 PMS250,212 mi
14
60%-1:08 AMWSW2:56 PMESE8:14 PMS248,501 mi
15
70%-1:31 AMWSW3:59 PMESE8:59 PMS246,066 mi
16
79%-1:58 AMWSW5:05 PMESE9:48 PMS243,062 mi
17
87%-2:31 AMWSW6:13 PMSE10:43 PMS239,704 mi
18
94%-3:13 AMSW7:18 PMSE11:42 PMS236,260 mi
19
96%-4:06 AMSW8:18 PMSE--
20
98%-5:11 AMSW9:10 PMSE12:45 AMS233,026 mi
21
100%-6:24 AMWSW9:52 PMESE1:47 AMS230,284 mi
22
99%-7:42 AMWSW10:26 PMESE2:47 AMS228,257 mi
23
95%-8:59 AMWSW10:55 PMESE3:42 AMS227,073 mi
24
89%-10:15 AMW11:21 PME4:34 AMS226,752 mi
25
80%-11:30 AMW11:45 PME5:23 AMS227,223 mi
26
69%-12:43 PMW-6:11 AMS228,347 mi
27
50%12:10 AMENE1:56 PMWNW-6:59 AMS229,959 mi
28
46%12:37 AMENE3:10 PMWNW-7:49 AMS231,896 mi
29
34%1:09 AMENE4:24 PMWNW-8:41 AMS234,026 mi
30
24%1:46 AMENE5:35 PMNW-9:37 AMS236,251 mi
31
15%2:31 AMNE6:39 PMNW-10:34 AMS238,510 mi

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Indianapolis is increasing during July, rising from 47% to 54% over the course of the month.

The highest chance of a muggy day during July is 56% on July 21.

For reference, on July 21, the muggiest day of the year, there are muggy conditions 56% of the time, while on December 12, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in July in Indianapolis

Humidity Comfort Levels in July in IndianapolisJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%JunAugJul 2156%Jul 2156%Jul 147%Jul 147%Jul 3154%Jul 3154%Jul 1153%Jul 1153%oppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydrymiserablemiserable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Indianapolis is gradually decreasing during July, decreasing from 7.2 miles per hour to 6.5 miles per hour over the course of the month.

For reference, on March 31, the windiest day of the year, the daily average wind speed is 11.4 miles per hour, while on July 30, the calmest day of the year, the daily average wind speed is 6.5 miles per hour.

The lowest daily average wind speed during July is 6.5 miles per hour on July 30.

Average Wind Speed in July in Indianapolis

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Indianapolis throughout July is predominantly from the west, with a peak proportion of 34% on July 19.

Wind Direction in July in Indianapolis

Wind Direction in July in IndianapolisSWSJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%JunAugwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Indianapolis typically lasts for 6.5 months (200 days), from around April 7 to around October 25, rarely starting before March 22 or after April 24, and rarely ending before October 3 or after November 14.

The month of July in Indianapolis is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in July in Indianapolis

Time Spent in Various Temperature Bands and the Growing Season in July in Indianapolisgrowing seasongrowing seasongrowing seasonJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAug100%Jul 16100%Jul 16coolcomfortablewarmhotcold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Indianapolis are rapidly increasing during July, increasing by 760°F, from 1,432°F to 2,192°F, over the course of the month.

Growing Degree Days in July in Indianapolis

The average growing degree days accumulated over the course of July, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Indianapolis is essentially constant during July, remaining within 0.1 kWh of 6.7 kWh throughout.

The highest average daily incident shortwave solar energy during July is 6.8 kWh on July 1.

Average Daily Incident Shortwave Solar Energy in July in Indianapolis

Average Daily Incident Shortwave Solar Energy in July in IndianapolisJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJunAugJul 16.8 kWhJul 16.8 kWhJul 316.6 kWhJul 316.6 kWhJul 116.8 kWhJul 116.8 kWhJul 216.7 kWhJul 216.7 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Indianapolis are 39.768 deg latitude, -86.158 deg longitude, and 712 ft elevation.

The topography within 2 miles of Indianapolis is essentially flat, with a maximum elevation change of 89 feet and an average elevation above sea level of 711 feet. Within 10 miles is essentially flat (564 feet). Within 50 miles contains significant variations in elevation (840 feet).

The area within 2 miles of Indianapolis is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (87%), and within 50 miles by cropland (74%) and trees (17%).

This report illustrates the typical weather in Indianapolis, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Indianapolis.

For each station, the records are corrected for the elevation difference between that station and Indianapolis according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Indianapolis is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Indianapolis and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Indianapolis and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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