September
September · June · August
83climate match
United States · 1991–2020
Best time to visit
New Chicago.
September leads for comfortable weather in New Chicago: typically 23.5°C by day, 13.4°C at night, with 95 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high23.5°C
Typical low13.4°C
Rain in September95 mm
July
July · August · June
71climate match
May
May · September · October
78climate match
The weakest month is January, scoring 5 against September’s 83 — days reach only 0°C, 24° below the 24°C the score treats as ideal.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
50° / -7.8°
Feb
51.9° / -6.1°
Mar
87.5° / -1.3°
Apr
3514.1° / 4.1°
May
6220.3° / 9.8°
Jun
7925.3° / 15.2°
Jul
7027.5° / 17.9°
Aug
7326.6° / 17.2°
Sep
8323.5° / 13.4°
Oct
4816.8° / 7°
Nov
189.4° / 1.4°
Dec
52.8° / -4.5°
| Month | Day | Night | Rain | Wet days | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | 0°C | -7.8°C | 60 mm | 8.5 | 3.2°C | 9 h 28 | 5 | Strong coverage |
| February | 1.9°C | -6.1°C | 49 mm | 6.9 | 1.7°C | 10 h 32 | 5 | Strong coverage |
| March | 7.5°C | -1.3°C | 58 mm | 8.4 | 1.8°C | 11 h 48 | 8 | Strong coverage |
| April | 14.1°C | 4.1°C | 90 mm | 9 | 4.0°C | 13 h 16 | 35 | Strong coverage |
| May | 20.3°C | 9.8°C | 107 mm | 9.8 | 7.9°C | 14 h 30 | 62 | Strong coverage |
| June | 25.3°C | 15.2°C | 115 mm | 9 | 15.1°C | 15 h 10 | 79 | Strong coverage |
| July | 27.5°C | 17.9°C | 98 mm | 7.5 | 21.3°C | 14 h 54 | 70 | Strong coverage |
| August | 26.6°C | 17.2°C | 107 mm | 8.2 | 22.6°C | 13 h 50 | 73 | Strong coverage |
| September | 23.5°C | 13.4°C | 95 mm | 7.2 | 20.2°C | 12 h 25 | 83 | Strong coverage |
| October | 16.8°C | 7°C | 96 mm | 8.8 | 14.7°C | 11 h 01 | 48 | Strong coverage |
| November | 9.4°C | 1.4°C | 69 mm | 7.7 | 9.5°C | 9 h 47 | 18 | Strong coverage |
| December | 2.8°C | -4.5°C | 52 mm | 7.7 | 5.8°C | 9 h 11 | 5 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.9°C8 Jan 2008 | -29.4°C19 Jan 1994 | 84 mm8 Jan 2008 | 126 mm2005 · driest 2 mm in 2022 | 36 |
| February | 23.3°C28 Feb 2024 | -26.1°C3 Feb 1996 | 47 mm21 Feb 1997 | 102 mm2009 · driest 10 mm in 2025 | 35 |
| March | 29.4°C22 Mar 2012 | -20.0°C4 Mar 2002 | 67 mm1 Mar 2017 | 159 mm2017 · driest 13 mm in 2015 | 37 |
| April | 31.1°C16 Apr 2002 | -7.8°C6 Apr 2018 | 52 mm25 Apr 2007 | 153 mm1993 · driest 20 mm in 2018 | 37 |
| May | 35.0°C29 May 2018 | -1.1°C3 May 2023 | 145 mm10 May 1996 | 246 mm1996 · driest 25 mm in 1992 | 35 |
| June | 36.7°C29 Jun 2012 | 2.8°C5 Jun 1990 | 138 mm14 Jun 1994 | 332 mm1993 · driest 40 mm in 2005 | 36 |
| July | 38.9°C31 Jul 1999 | 7.2°C6 Jul 2001 | 107 mm18 Jul 1996 | 194 mm2003 · driest 1 mm in 2026 | 38 |
| August | 36.7°C3 Aug 1991 | 7.2°C27 Aug 2025 | 197 mm18 Aug 1990 | 313 mm1990 · driest 17 mm in 2019 | 37 |
| September | 35.6°C11 Sep 2013 | 1.7°C30 Sep 1993 | 121 mm13 Sep 2008 | 418 mm2008 · driest 15 mm in 2004 | 37 |
| October | 31.7°C2 Oct 2019 | -5.0°C31 Oct 2023 | 94 mm26 Oct 2022 | 227 mm2001 · driest 0 mm in 2025 | 37 |
| November | 25.0°C2 Nov 2016 | -13.9°C20 Nov 2022 | 98 mm28 Nov 1990 | 217 mm1990 · driest 8 mm in 1999 | 35 |
| December | 20.6°C6 Dec 2001 | -28.3°C22 Dec 1989 | 41 mm7 Dec 1998 | 123 mm2008 · driest 3 mm in 2017 | 36 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 27 | 2 | 8 |
| February | 0 | 0 | 24 | 1 | 5 |
| March | <1 | 0 | 19 | 2 | 3 |
| April | 2 | <1 | 5 | 3 | <1 |
| May | 9 | 2 | <1 | 3 | 0 |
| June | 17 | 6 | 0 | 4 | 0 |
| July | 22 | 9 | 0 | 3 | 0 |
| August | 20 | 6 | 0 | 3 | 0 |
| September | 12 | 3 | 0 | 2 | 0 |
| October | 3 | <1 | 1 | 3 | 0 |
| November | 0 | 0 | 12 | 2 | 1 |
| December | 0 | 0 | 24 | 2 | 6 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 27% | 6% | 30% | -2.4–3.2°C |
| February | <1% | 24% | 5% | 26% | -0.7–5.4°C |
| March | 6% | 28% | 6% | 35% | 4.6–12.0°C |
| April | 16% | 31% | 10% | 36% | 11.7–16.9°C |
| May | 36% | 31% | 9% | 38% | 17.9–22.7°C |
| June | 59% | 30% | 12% | 34% | 23.9–26.8°C |
| July | 74% | 24% | 8% | 26% | 25.6–29.5°C |
| August | 73% | 25% | 10% | 26% | 25.0–28.2°C |
| September | 59% | 24% | 8% | 26% | 21.6–25.8°C |
| October | 24% | 28% | 10% | 30% | 15.1–18.9°C |
| November | 5% | 24% | 7% | 26% | 6.6–12.7°C |
| December | 0% | 26% | 5% | 32% | -0.4–6.4°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 4924095
- NOAA station
- USC00124244 · INDIANA DUNES NP
- Station distance
- 17.5 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 27 usable years
- Daylight
- Calculated from latitude 41.56°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 11 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.