Indianapolis
Indiana, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Indianapolis, IN

The magnificent Monument Circle in Indianapolis, Indiana with the surrounding cityscape, and a perfect blue night sky
The magnificent Monument Circle in Indianapolis, Indiana with the surrounding cityscape, and a perfect blue night sky
August is a warm and humid summer month in Indianapolis with average temperatures in the 64°F (17.8°C) to 84°F (28.9°C) zone.
The sunshine registers 8.8 hours during the 14-hour long days, which see many activities like fishing, kayaking, canoeing, and swimming in the numerous water bodies around the city. The skies are occasionally cloudy, and the rainfall of 3.1" (78.7mm) occurs mostly during the thunderstorms that are frequent in August. Evenings are cozy and bright for a nice walk down the river.
Light summer clothing such as t-shirts and sweatshirts are comfortable to wear in August to take care of the sweating.

What is the temperature in August in Indianapolis?

The average high-temperature, in August, in Indianapolis, Indiana, is 84°F (28.9°C), while the average low-temperature is 64.4°F (18°C).

What is the average humidity in August in Indianapolis?

In Indianapolis, Indiana, the average relative humidity in August is 75.4%.

How many days does it rain in August in Indianapolis?

In August, in Indianapolis, Indiana, the rain falls for 8.5 days. Throughout August, 3.1" (79.5mm) of precipitation is accumulated.

How many hours of daylight does Indianapolis have in August?

The average length of the day in August is 13.7h.

How many hours of sunshine does Indianapolis have in August?

The average sunshine in August in Indianapolis, Indiana, is 8.8h.

How high is the UV index in August in Indianapolis?

The average daily maximum UV index in August in Indianapolis is 8. A UV Index reading of 8 to 10 represents a very high health risk from unprotected exposure to the UV radiation.
Average temperature in August - Indianapolis, IN
  • Average high temperature in August: 84°F

The warmest month (with the highest average high temperature) is July (85°F).
The month with the lowest average high temperature is January (35.6°F).

  • Average low temperature in August: 64.4°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).

Average humidity in August - Indianapolis, IN
  • Average humidity in August: 75.4%

The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is April (65.6%).

Average rainfall in August - Indianapolis, IN
  • Average rainfall in August: 3.1"

The wettest month (with the highest rainfall) is May (5.1").
The driest month (with the lowest rainfall) is February (2.3").

Average rainfall days in August - Indianapolis, IN
  • Average rainfall days in August: 8.5 days

The month with the highest number of rainy days is May (13.1 days).
The month with the lowest number of rainy days is September (8.1 days).

Average snowfall in August - Indianapolis, IN
  • Average snowfall in August: 0"

The month with the highest snowfall is January (8.6").
Months with the lowest snowfall are May, June, July, August and September (0").

Average snowfall days in August - Indianapolis, IN
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (7.5 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average daylight in August / Average sunshine in August - Indianapolis, IN
  • Average daylight in August: 13.7h

The month with the longest days is June (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9.4h).

  • Average sunshine in August: 8.8h

The month with most sunshine is June (Average sunshine: 9.6h).
The month with least sunshine is December (Average sunshine: 3.3h).

Average UV index in August - Indianapolis, IN
  • Average UV index in August: 8

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 2).