September
September · June · August
84climate match
United States · 1991–2020
Best time to visit
Morton Grove.
September leads for comfortable weather in Morton Grove: typically 24°C by day, 12.5°C at night, with 84 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24°C
Typical low12.5°C
Rain in September84 mm
July
July · August · June
73climate match
May
May · September · October
75climate match
The weakest month is January, scoring 5 against September’s 84 — 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° / -8.8°
Feb
52.2° / -7.2°
Mar
87.6° / -2.2°
Apr
3013.8° / 3.2°
May
5820.1° / 8.7°
Jun
7725.7° / 14.1°
Jul
6928.5° / 17.3°
Aug
7027.7° / 16.9°
Sep
8424° / 12.5°
Oct
4917.2° / 6°
Nov
179.4° / 0.3°
Dec
52.9° / -5.5°
| Month | Day | Night | Rain | Wet days | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | 0°C | -8.8°C | 51 mm | 7.4 | 3.4°C | 9 h 26 | 5 | Strong coverage |
| February | 2.2°C | -7.2°C | 53 mm | 6.7 | 2.2°C | 10 h 30 | 5 | Strong coverage |
| March | 7.6°C | -2.2°C | 57 mm | 7.5 | 2.2°C | 11 h 48 | 8 | Strong coverage |
| April | 13.8°C | 3.2°C | 97 mm | 10 | 3.7°C | 13 h 17 | 30 | Strong coverage |
| May | 20.1°C | 8.7°C | 119 mm | 9.9 | 6.6°C | 14 h 32 | 58 | Strong coverage |
| June | 25.7°C | 14.1°C | 107 mm | 9.3 | 13.5°C | 15 h 13 | 77 | Strong coverage |
| July | 28.5°C | 17.3°C | 93 mm | 7.9 | 20.7°C | 14 h 57 | 69 | Strong coverage |
| August | 27.7°C | 16.9°C | 107 mm | 8 | 22.4°C | 13 h 52 | 70 | Strong coverage |
| September | 24°C | 12.5°C | 84 mm | 7.7 | 20.0°C | 12 h 26 | 84 | Strong coverage |
| October | 17.2°C | 6°C | 90 mm | 8.5 | 14.3°C | 11 h | 49 | Strong coverage |
| November | 9.4°C | 0.3°C | 68 mm | 7.3 | 9.0°C | 9 h 45 | 17 | Strong coverage |
| December | 2.9°C | -5.5°C | 60 mm | 8.1 | 5.6°C | 9 h 08 | 5 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.3°C8 Jan 2008 | -32.8°C10 Jan 1982 | 54 mm1 Jan 1985 | 105 mm2005 · driest 10 mm in 1986 | 37 |
| February | 23.3°C26 Feb 2000 | -28.9°C1 Feb 2019 | 81 mm21 Feb 1997 | 149 mm1997 · driest 1 mm in 1987 | 38 |
| March | 30.0°C21 Mar 2012 | -20.6°C4 Mar 2002 | 51 mm4 Mar 1985 | 122 mm2009 · driest 23 mm in 1996 | 38 |
| April | 32.2°C19 Apr 2002 | -12.2°C7 Apr 1982 | 69 mm18 Apr 2013 | 227 mm1999 · driest 27 mm in 2005 | 38 |
| May | 35.0°C28 May 2012 | -2.2°C3 May 2004 | 84 mm13 May 2014 | 239 mm2004 · driest 15 mm in 1992 | 38 |
| June | 38.9°C22 Jun 1988 | 2.8°C1 Jun 1993 | 114 mm24 Jun 1994 | 248 mm2018 · driest 10 mm in 1995 | 37 |
| July | 40.6°C6 Jul 2012 | 7.2°C1 Jul 1982 | 102 mm23 Jul 2011 | 201 mm2017 · driest 27 mm in 1991 | 37 |
| August | 38.3°C2 Aug 1988 | 5.6°C29 Aug 1986 | 141 mm14 Aug 1987 | 333 mm1987 · driest 30 mm in 2003 | 37 |
| September | 36.1°C7 Sep 1990 | -1.1°C23 Sep 1995 | 85 mm14 Sep 2008 | 324 mm2008 · driest 6 mm in 2004 | 36 |
| October | 31.7°C8 Oct 2007 | -4.4°C19 Oct 1992 | 91 mm3 Oct 2006 | 239 mm2017 · driest 24 mm in 2005 | 36 |
| November | 25.0°C2 Nov 2016 | -14.4°C13 Nov 1986 | 59 mm1 Nov 1994 | 182 mm1985 · driest 10 mm in 1999 | 36 |
| December | 21.1°C6 Dec 2001 | -28.9°C24 Dec 1983 | 71 mm3 Dec 1982 | 167 mm2008 · driest 11 mm in 1989 | 38 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 2 | 7 |
| February | 0 | 0 | 25 | 2 | 5 |
| March | <1 | 0 | 21 | 2 | 3 |
| April | 2 | <1 | 7 | 3 | <1 |
| May | 8 | 3 | <1 | 4 | 0 |
| June | 18 | 7 | 0 | 3 | 0 |
| July | 25 | 12 | 0 | 3 | 0 |
| August | 25 | 9 | 0 | 4 | 0 |
| September | 13 | 4 | <1 | 3 | 0 |
| October | 4 | <1 | 4 | 3 | <1 |
| November | 0 | 0 | 14 | 3 | 1 |
| December | 0 | 0 | 26 | 2 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 23% | 5% | 22% | -3.9–3.3°C |
| February | <1% | 23% | 6% | 23% | -1.8–5.7°C |
| March | 4% | 25% | 7% | 30% | 4.2–10.2°C |
| April | 13% | 33% | 11% | 42% | 10.9–16.1°C |
| May | 32% | 32% | 12% | 41% | 17.2–22.4°C |
| June | 60% | 29% | 10% | 35% | 23.7–27.7°C |
| July | 73% | 25% | 9% | 26% | 26.5–30.4°C |
| August | 73% | 25% | 12% | 25% | 25.2–29.2°C |
| September | 59% | 26% | 9% | 30% | 22.1–25.8°C |
| October | 22% | 27% | 8% | 29% | 15.6–18.5°C |
| November | 3% | 26% | 9% | 31% | 5.9–12.4°C |
| December | <1% | 26% | 7% | 28% | -1.2–6.0°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 4902763
- NOAA station
- USC00111497 · CHICAGO BOTANIC GARDEN
- Station distance
- 11.1 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 28 usable years
- Daylight
- Calculated from latitude 42.04°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 16 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.