September
September · June · August
79climate match
United States · 1991–2020
Best time to visit
Grand Rapids.
September leads for comfortable weather in Grand Rapids: typically 23.1°C by day, 11.4°C at night, with 87 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high23.1°C
Typical low11.4°C
Rain in September87 mm
July
July · August · June
70climate match
May
May · September · October
76climate match
The weakest month is January, scoring 5 against September’s 79 — days reach only -0.7°C, 25° 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
5-0.7° / -7.7°
Feb
50.8° / -7.2°
Mar
56.8° / -3.1°
Apr
3014.2° / 2.7°
May
6320.8° / 8.9°
Jun
7826.1° / 14.4°
Jul
7028.2° / 16.7°
Aug
7727° / 15.9°
Sep
7923.1° / 11.4°
Oct
4015.8° / 5.4°
Nov
98.3° / 0.1°
Dec
52.1° / -4.4°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -0.7°C | -7.7°C | 64 mm | 11.6 | 9 h 20 | 5 | Strong coverage |
| February | 0.8°C | -7.2°C | 54 mm | 8.9 | 10 h 27 | 5 | Strong coverage |
| March | 6.8°C | -3.1°C | 61 mm | 8.4 | 11 h 47 | 5 | Strong coverage |
| April | 14.2°C | 2.7°C | 101 mm | 10.2 | 13 h 20 | 30 | Strong coverage |
| May | 20.8°C | 8.9°C | 102 mm | 10 | 14 h 37 | 63 | Strong coverage |
| June | 26.1°C | 14.4°C | 100 mm | 8.1 | 15 h 20 | 78 | Strong coverage |
| July | 28.2°C | 16.7°C | 98 mm | 7.6 | 15 h 03 | 70 | Strong coverage |
| August | 27°C | 15.9°C | 90 mm | 7.5 | 13 h 56 | 77 | Strong coverage |
| September | 23.1°C | 11.4°C | 87 mm | 7.8 | 12 h 26 | 79 | Strong coverage |
| October | 15.8°C | 5.4°C | 102 mm | 9.6 | 10 h 58 | 40 | Strong coverage |
| November | 8.3°C | 0.1°C | 79 mm | 9.8 | 9 h 40 | 9 | Strong coverage |
| December | 2.1°C | -4.4°C | 63 mm | 10.8 | 9 h 01 | 5 | Strong coverage |
What has changed
Grand Rapids runs +1.0°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
+1.2
Feb
+1.3
Mar
+1.7
Apr
+0.1
May
+0.7
Jun
+1.0
Jul
+0.4
Aug
+0.5
Sep
+1.6
Oct
+1.1
Nov
+0.7
Dec
+2.3
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 17.2°C7 Jan 2008 | -30.0°C19 Jan 1994 | 55 mm4 Jan 1993 | 119 mm2005 · driest 12 mm in 1981 | 63 |
| February | 22.8°C27 Feb 2024 | -28.3°C17 Feb 1973 | 75 mm21 Feb 1997 | 125 mm2018 · driest 8 mm in 1969 | 63 |
| March | 30.6°C21 Mar 2012 | -22.2°C2 Mar 1978 | 51 mm31 Mar 2023 | 138 mm2023 · driest 14 mm in 2001 | 63 |
| April | 31.1°C29 Apr 1970 | -16.1°C7 Apr 1982 | 84 mm18 Apr 2013 | 282 mm2013 · driest 20 mm in 2005 | 63 |
| May | 34.4°C28 May 2018 | -5.6°C10 May 1966 | 105 mm15 May 2001 | 254 mm2001 · driest 21 mm in 2023 | 63 |
| June | 36.7°C21 Jun 1988 | 0.6°C11 Jun 1972 | 81 mm23 Jun 1989 | 216 mm2021 · driest 6 mm in 1988 | 63 |
| July | 40.0°C6 Jul 2012 | 5.0°C6 Jul 1983 | 90 mm5 Jul 1994 | 224 mm1992 · driest 21 mm in 1976 | 63 |
| August | 37.8°C3 Aug 1964 | 3.9°C30 Aug 1976 | 92 mm14 Aug 1987 | 215 mm1987 · driest 4 mm in 1969 | 62 |
| September | 35.6°C23 Sep 2017 | -2.8°C28 Sep 1991 | 82 mm11 Sep 1986 | 301 mm1986 · driest 0 mm in 1979 | 62 |
| October | 31.1°C8 Oct 2007 | -7.8°C21 Oct 1974 | 72 mm30 Oct 2009 | 246 mm2017 · driest 15 mm in 1964 | 62 |
| November | 25.0°C6 Nov 1975 | -15.0°C26 Nov 1975 | 75 mm27 Nov 1990 | 201 mm2003 · driest 13 mm in 2012 | 62 |
| December | 20.6°C5 Dec 2001 | -27.8°C19 Dec 1983 | 54 mm10 Dec 1971 | 169 mm1971 · driest 17 mm in 1969 | 63 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 2 | 15 |
| February | 0 | 0 | 26 | 1 | 11 |
| March | <1 | 0 | 23 | 2 | 6 |
| April | 2 | <1 | 10 | 3 | 2 |
| May | 8 | 2 | <1 | 3 | 0 |
| June | 20 | 6 | 0 | 3 | 0 |
| July | 27 | 10 | 0 | 3 | 0 |
| August | 24 | 7 | 0 | 3 | 0 |
| September | 12 | 2 | <1 | 3 | 0 |
| October | 2 | <1 | 4 | 3 | <1 |
| November | 0 | 0 | 16 | 3 | 5 |
| December | 0 | 0 | 26 | 2 | 12 |
The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 81); on 2011–2025 it is September (91). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 35% | 4% | 46% | -3.8–2.2°C |
| February | 0% | 30% | 4% | 35% | -2.4–3.7°C |
| March | 3% | 29% | 7% | 39% | 3.0–10.0°C |
| April | 14% | 34% | 10% | 44% | 11.4–16.6°C |
| May | 43% | 29% | 9% | 36% | 17.9–23.8°C |
| June | 68% | 28% | 10% | 30% | 24.1–27.9°C |
| July | 75% | 25% | 10% | 25% | 26.7–29.9°C |
| August | 75% | 24% | 11% | 23% | 25.3–28.5°C |
| September | 57% | 26% | 10% | 32% | 21.1–25.2°C |
| October | 19% | 30% | 10% | 37% | 13.3–18.0°C |
| November | 3% | 33% | 9% | 45% | 4.7–11.3°C |
| December | 0% | 36% | 5% | 49% | -1.3–4.9°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 4994358
- NOAA station
- USW00094860 · GRAND RAPIDS
- Station distance
- 12.7 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 42.96°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.