Climate and monthly weather forecast
Indianapolis, IN

The magnificent Monument Circle in Indianapolis, Indiana with the surrounding cityscape
The magnificent Monument Circle in Indianapolis, Indiana with the surrounding cityscape

The climate of Indianapolis, IN

Indianapolis has a humid continental climate (Köppen climate classification Dfa) with hot and humid summers and cold and snowy winters. Indianapolis, the capital of the American state of Indiana, lies in its central part, on the White River, in the Midwestern United States. The temperate latitudes, low altitude, and proximity to water bodies mainly influence the climate of Indianapolis.

Indianapolis has mostly flat to gently sloping terrain with an average elevation of 218 meters. The entire city lies within the Tipton Till Plain with the natural elevations ranging from 198 meters at the lowest to 274 meters at the highest points. The topography chiefly consists of few rolling hills, short ridges, fertile agricultural land, lakes, creeks, and rivers. Eagle Creek Reservoir, Geist Reservoir, and Indian Lake are some of the major water bodies in Indianapolis.

Summer in Indianapolis is usually humid, hot, and wet, with the average high temperature reaching 84.9°F (29.4°C) at the peak in July. Winters are cold and snowy, with the average low temperature plummeting to 19.9°F (-6.7°C) in the coldest month of January. Cold winds from the Canadian north strike the city in the absence of high barriers in the form of high mountain ranges. Spring and fall seasons are pleasant but unpredictable and prone to occasional snowfall.

The annual precipitation in Indianapolis is to the tune of 42" (1067mm), spread throughout the year with heavy rainfall during late spring and summer. Snowfall registers a moderate 26" (660mm) with 24 snowy days during the year. The sunshine is ample and registers 2440 hours annually. The average humidity over the year is approximately 72% and peaks in December when the skies are cloudy.

The record high temperature for Indianapolis is 106°F (41.1°C), set on July 14, 1936, while the coldest temperature on record is -27°F (-32.8°C), set on January 19, 1994.

The best time to visit Indianapolis, IN

The best time to visit Indianapolis is from late spring in May to the fall season in September in the absence of harsh weather. The average temperatures are in the range of 55.9°F (13.3°C) to 84.9°F (29.4°C) with an increase in humidity in late summer and rainfall from May to July. Summer gives plenty of leisure time to spend in the cool shade of the trees in the numerous parks throughout the city. There is ample sunshine from May to September that gives many opportunities for exploring the city and its various attractions.

The worst time to visit Indianapolis, IN

The worst time to visit Indianapolis is during the winter from December to February when the cold is severe, and even the days are at their chilliest. The temperatures drop below freezing on many nights and five nights during the year register below 0°F (-17.8°C). Snow, frost, and wind further exacerbate the cold effect as sunshine is at a premium during the winter. December has the shortest days of the year and is often prone to snowstorms that severely affect outdoor activities.

Weather hazards

Indianapolis is prone to thunderstorms, rainstorms, and snowstorms during the year. Thunderstorms and rainstorms mainly occur during late spring and summer, and the city accounts for an average of 20 storms during the season. Severe thunderstorms pose the risk of lightning strikes, while rainstorms occasionally create flood situations. Snowstorms primarily occur during the winter but may even blow during early spring and late autumn.

Weather in January

January, the same as December, is a wintry winter month in Indianapolis, Indiana, with an average temperature ranging between min 21°F (-6.1°C) and max 33.4°F (0.8°C). With an average high-temperature of 33.4°F (0.8°C) and an average low-temperature of 21°F (-6.1°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter in Indianapolis, is another cold month, with an average temperature ranging between max 38.3°F (3.5°C) and min 25.2°F (-3.8°C). In February, the average high-temperature is essentially the same as in January - a still wintry 38.3°F (3.5°C). Weather in February »

Weather in March

The first month of the spring, March, is a fresh month in Indianapolis, Indiana, with temperature in the range of an average low of 35.1°F (1.7°C) and an average high of 50°F (10°C). In Indianapolis, the average high-temperature in March increases from a wintry 38.3°F (3.5°C) in February to a cool 50°F (10°C). Weather in March »

Weather in April

April in Indianapolis, Indiana, is a comfortable spring month, with an average temperature varying between 45.1°F (7.3°C) and 61.5°F (16.4°C). In April, the average high-temperature increases from a fresh 50°F (10°C) in March to a comfortable 61.5°F (16.4°C). Weather in April »

Weather in May

May, the last month of the spring in Indianapolis, is an agreeable month, with an average temperature ranging between min 55.6°F (13.1°C) and max 71.8°F (22.1°C). In Indianapolis, the average high-temperature in May rises from an enjoyable 61.5°F (16.4°C) in April to a pleasant 71.8°F (22.1°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Indianapolis, Indiana, with an average temperature varying between 64°F (17.8°C) and 80.2°F (26.8°C). In June, the average high-temperature slightly increases from a pleasant 71.8°F (22.1°C) in May to a warm 80.2°F (26.8°C). Weather in June »

Weather in July

July, like June, in Indianapolis, Indiana, is another warm summer month, with an average temperature fluctuating between 66.2°F (19°C) and 82°F (27.8°C). July is the warmest month, with an average high-temperature of 82°F (27.8°C) and an average low-temperature of 66.2°F (19°C). In July, the average heat index is estimated at a tropical 89.6°F (32°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Indianapolis, Indiana, with temperature in the range of an average low of 64°F (17.8°C) and an average high of 81.1°F (27.3°C). In Indianapolis, the average high-temperature in August is essentially the same as in July - a still moderately hot 81.1°F (27.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a moderately hot month in Indianapolis, Indiana, with an average temperature ranging between max 75.9°F (24.4°C) and min 58.3°F (14.6°C). In Indianapolis, the average high-temperature in September is almost the same as in August - a still warm 75.9°F (24.4°C). Weather in September »

Weather in October

October, like September, in Indianapolis, Indiana, is another comfortable autumn month, with an average temperature ranging between max 63.1°F (17.3°C) and min 47.3°F (8.5°C). In Indianapolis, the average high-temperature in October decreases from a warm 75.9°F (24.4°C) in September to a comfortable 63.1°F (17.3°C). Weather in October »

Weather in November

November, the last month of the autumn in Indianapolis, is another chilly month, with an average temperature varying between 36.1°F (2.3°C) and 49.3°F (9.6°C). In November, the average high-temperature drops from an enjoyable 63.1°F (17.3°C) in October to a chilly 49.3°F (9.6°C). Weather in November »

Weather in December

The first month of the winter, December, is still a cold month in Indianapolis, Indiana, with an average temperature fluctuating between 38.3°F (3.5°C) and 28.2°F (-2.1°C). In December, the average high-temperature drops from a frosty 49.3°F (9.6°C) in November to a wintry 38.3°F (3.5°C). Weather in December »
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FAQ

What is the coldest month in Indianapolis?

The coldest month is January, with an average high-temperature of 33.4°F (0.8°C) and an average low-temperature of 21°F (-6.1°C).

How many days does it rain in Indianapolis?

Throughout the year, in Indianapolis, there are 146.4 rainfall days, and 21.14" (537mm) of precipitation is accumulated.

When does it snow in Indianapolis?

Months with snowfall are January through April, November and December.

How much does it snow in Indianapolis?

In Indianapolis, during the entire year, snow falls for 28.1 days and aggregates up to 7.87" (200mm) of snow.

What is the month with the least sunshine in Indianapolis?

January has the least sunshine of the year in Indianapolis, Indiana, with an average of 4.1h of sunshine.

What is the month with the lowest UV index in Indianapolis?

January, February, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Indianapolis.

What is the driest month in Indianapolis?

February is the month with the least rainfall. Rain falls for 6.8 days and accumulates 1.22" (31mm) of precipitation.

When is Daylight Saving Time (DST) in Indianapolis?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in Indianapolis, Indiana, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from EDT to EST.

What is the wettest month in Indianapolis?

The month with the most rainfall in Indianapolis is May, when the rain falls for 17.6 days and typically aggregates up to 2.68" (68mm) of precipitation.

When it does not snow in Indianapolis?

May through October are months without snowfall.

What is the month with the highest UV index in Indianapolis?

May through August, with an average maximum UV index of 6, are months with the highest UV index in Indianapolis.

When are the longest days in Indianapolis?

The month with the longest days is June, with an average of 14h and 56min of daylight.

What is the warmest month in Indianapolis?

The warmest month in Indianapolis is July, with an average high-temperature of 82°F (27.8°C) and an average low-temperature of 66.2°F (19°C).

What month has the most sunshine in Indianapolis?

The month with the most sunshine in Indianapolis is July, with an average of 10.3h of sunshine.

What is the least humid month in Indianapolis?

October is the least humid month, with an average relative humidity of 73%.

What is the most humid month in Indianapolis?

December is the most humid month in Indianapolis, Indiana, with an average relative humidity of 82%.

When does it snow the most in Indianapolis?

December is the month with the most snowfall. Snow falls for 6.2 days and accumulates 2.28" (58mm) of snow.

What is the month with the shortest days in Indianapolis?

With an average of 9h and 25min of daylight, December has the shortest days of the year.

Average pressure
Indianapolis, IN

Average pressure - Indianapolis, IN

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed
Indianapolis, IN

Average wind speed - Indianapolis, IN

The windiest months (with the highest average wind speed) are January and February (9.8mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

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Average humidity
Indianapolis, IN

Average humidity - Indianapolis, IN

The month with the highest relative humidity is December (82%).
The month with the lowest relative humidity is October (73%).

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Average rainfall
Indianapolis, IN

Average rainfall - Indianapolis, IN

The wettest month (with the highest rainfall) is May (2.68").
The driest month (with the least rainfall) is February (1.22").

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Average rainfall days
Indianapolis, IN

Average rainfall days - Indianapolis, IN

The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is February (6.8 days).

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Average snowfall
Indianapolis, IN

Average snowfall - Indianapolis, IN

The month with the highest snowfall is December (2.28").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days
Indianapolis, IN

Average snowfall days - Indianapolis, IN

The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Indianapolis, IN

Average daylight / Average sunshine - Indianapolis, IN

The month with the longest days is June (Average daylight: 14h and 56min).
The month with the shortest days is December (Average daylight: 9h and 25min).

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days
Indianapolis, IN

Average sunshine days - Indianapolis, IN

The month with the most sunshine days is October (18.6 days).
The month with the least sunshine days is May (11.1 days).

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Average UV index
Indianapolis, IN

Average UV index - Indianapolis, IN

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).

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Average visibility
Indianapolis, IN

Average visibility - Indianapolis, IN

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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