Annual mean 12°C · wettest around March · prevailing wind SW
Warmest
27.8 °C
Coldest
-0.8 °C
Wettest
43%
Windiest
5.7 m/s
Prevailing
SW
4.3 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Indianapolis over the whole year is 12°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -3°C. Indianapolis has no sharply defined rainy season: the chance of rain on a given day runs from 33% in October, the driest month, to 39% in March, the wettest. Winds in Indianapolis are highest in March, averaging 4.2 m/s (15 km/h), and lightest in August, at 2.1 m/s (8 km/h). The prevailing wind is from the SW. The clearest skies in Indianapolis come in September, when the sky is typically 33% covered; January is the cloudiest month, at 62%.
Month by month Indianapolis climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
0°C
-3°C
-5°C
37%
62%
4.0 m/s
0
0
6
February
4°C
-1°C
-2°C
36%
53%
4.1 m/s
2
0
17
March
9°C
3°C
4°C
39%
52%
4.2 m/s
10
0
33
April
15°C
8°C
10°C
37%
49%
4.0 m/s
31
2
56
May
21°C
14°C
19°C
37%
46%
3.3 m/s
60
21
57
June
27°C
19°C
26°C
37%
36%
2.9 m/s
57
48
29
July
28°C
21°C
29°C
37%
36%
2.3 m/s
36
64
10
August
27°C
19°C
28°C
36%
36%
2.1 m/s
45
58
18
September
25°C
15°C
24°C
36%
33%
2.2 m/s
60
45
38
October
18°C
10°C
15°C
33%
42%
2.9 m/s
46
10
64
November
9°C
3°C
5°C
36%
45%
3.5 m/s
12
0
37
December
4°C
-0°C
-2°C
36%
56%
3.7 m/s
1
0
13
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Indianapolis weather by season
Year round, Indianapolis has days of about 0°C at their warmest in January, its coolest month, and 28°C in July, its warmest; the coolest hours of the day run from -3°C to 21°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around March and least likely around October. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Indianapolis weather in winterDecember to February
High 3°CLow -1°CRain 36%
Winter in Indianapolis has typical daily highs of about 3°C and lows of about -1°C, with a 36% chance of rain on a given day.
Indianapolis weather in springMarch to May
High 15°CLow 8°CRain 38%
Spring in Indianapolis has typical daily highs of about 15°C and lows of about 8°C, with a 38% chance of rain on a given day.
Indianapolis weather in summerJune to August
High 27°CLow 20°CRain 36%
Summer in Indianapolis has typical daily highs of about 27°C and lows of about 20°C, with a 36% chance of rain on a given day.
Indianapolis weather in autumnSeptember to November
High 17°CLow 9°CRain 35%
Autumn in Indianapolis has typical daily highs of about 17°C and lows of about 9°C, with a 35% chance of rain on a given day.
When is the rainy season in Indianapolis?
Indianapolis has no sharply defined rainy season: the chance of rain on a given day runs from 33% in October, the driest month, to 39% in March, the wettest.
What time of year is Indianapolis windiest?
Winds in Indianapolis are highest in March, averaging 4.2 m/s (15 km/h), and lightest in August, at 2.1 m/s (8 km/h). The prevailing wind is from the SW.
What is the average temperature in Indianapolis year round?
The average temperature in Indianapolis over the whole year is 12°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -3°C.