Porter climate

Porter Weather in September

NOAA 1991-2020 normals for Indiana Dunes Nl, 2.1 km from Porter

Average highs run from 78°F on September 1 to 69°F on September 30, and lows from 61°F to 51°F. Normal precipitation for the month is 3.65 in over about 10 wet days.

September day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Porter, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
74°F
Average low
56°F
Precipitation
3.65 in
Record high
97°FSep 10, 2013
Record low
36°FSep 24, 2012
Chance of a freeze
0%
Days of 90°F or more
1.6
Daylight
13 h 07 min to 11 h 48 min
Cloud cover
52%
Humidity
72%
Dew point
55°F
Wind
9.2 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Sep 178°F61°F95°F 201146°F 200931%0%
Sep 278°F61°F95°F 201144°F 201731%0%
Sep 378°F61°F93°F 201149°F 202431%0%
Sep 478°F60°F94°F 201848°F 202431%0%
Sep 578°F60°F94°F 201845°F 200331%0%
Sep 677°F60°F93°F 199843°F 200032%0%
Sep 777°F60°F92°F 201643°F 202432%0%
Sep 877°F59°F94°F 200241°F 202532%0%
Sep 977°F59°F94°F 201342°F 202532%0%
Sep 1076°F59°F97°F 201344°F 199832%0%
Sep 1176°F58°F97°F 201346°F 199932%0%
Sep 1276°F58°F93°F 201946°F 200732%0%
Sep 1375°F58°F92°F 200541°F 201432%0%
Sep 1475°F57°F92°F 202138°F 201332%0%
Sep 1575°F57°F92°F 202639°F 201132%0%
Sep 1675°F56°F92°F 201838°F 201132%0%
Sep 1774°F56°F93°F 201841°F 201433%0%
Sep 1874°F56°F89°F 200742°F 202033%0%
Sep 1973°F55°F92°F 202137°F 202033%0%
Sep 2073°F55°F95°F 201840°F 202033%0%
Sep 2173°F54°F94°F 201737°F 200633%0%
Sep 2272°F54°F95°F 201738°F 199933%0%
Sep 2372°F54°F95°F 201739°F 201234%0%
Sep 2472°F53°F93°F 201736°F 201234%0%
Sep 2571°F53°F91°F 201738°F 200034%0%
Sep 2671°F52°F92°F 201738°F 200034%0%
Sep 2770°F52°F87°F 202142°F 201034%0%
Sep 2870°F51°F83°F 202539°F 200034%0%
Sep 2970°F51°F88°F 202537°F 200635%0%
Sep 3069°F51°F89°F 201937°F 200435%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Porter, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:14 AM, sunset 7:21 PM
September 30
sunrise 6:44 AM, sunset 6:32 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00124244 (Indiana Dunes Nl), public domain. Records: NOAA GHCN-Daily, station USW00004846, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.