September
September · August · July
79climate match
United States · 1991–2020
Best time to visit
South Beloit.
September leads for comfortable weather in South Beloit: typically 23.3°C by day, 11.2°C at night, with 97 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high23.3°C
Typical low11.2°C
Rain in September97 mm
July
July · August · June
71climate match
May
May · September · October
75climate match
The weakest month is January, scoring 5 against September’s 79 — days reach only -2.3°C, 26° 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
5-2.3° / -10.8°
Feb
50° / -9°
Mar
56.8° / -3.4°
Apr
3114.1° / 2.5°
May
6120.6° / 8.7°
Jun
7226° / 14.2°
Jul
7328° / 16.5°
Aug
7527° / 15.7°
Sep
7923.3° / 11.2°
Oct
4716.1° / 4.8°
Nov
117.7° / -1.4°
Dec
50.7° / -7.2°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -2.3°C | -10.8°C | 41 mm | 6.6 | 9 h 23 | 5 | Strong coverage |
| February | 0°C | -9°C | 39 mm | 5.8 | 10 h 29 | 5 | Strong coverage |
| March | 6.8°C | -3.4°C | 53 mm | 6.7 | 11 h 48 | 5 | Strong coverage |
| April | 14.1°C | 2.5°C | 94 mm | 8.7 | 13 h 18 | 31 | Strong coverage |
| May | 20.6°C | 8.7°C | 108 mm | 9.9 | 14 h 35 | 61 | Strong coverage |
| June | 26°C | 14.2°C | 141 mm | 8.9 | 15 h 17 | 72 | Strong coverage |
| July | 28°C | 16.5°C | 87 mm | 7.2 | 15 h 00 | 73 | Strong coverage |
| August | 27°C | 15.7°C | 105 mm | 7.1 | 13 h 54 | 75 | Strong coverage |
| September | 23.3°C | 11.2°C | 97 mm | 6.5 | 12 h 26 | 79 | Strong coverage |
| October | 16.1°C | 4.8°C | 72 mm | 6.8 | 10 h 59 | 47 | Strong coverage |
| November | 7.7°C | -1.4°C | 58 mm | 6.1 | 9 h 42 | 11 | Strong coverage |
| December | 0.7°C | -7.2°C | 50 mm | 6.6 | 9 h 05 | 5 | Strong coverage |
What has changed
South Beloit runs -0.5°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
0.0
Feb
-0.3
Mar
+0.3
Apr
-2.0
May
-1.4
Jun
-0.9
Jul
-1.0
Aug
-0.7
Sep
+0.1
Oct
-1.1
Nov
-0.8
Dec
+1.5
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 16.1°C28 Jan 2002 | -33.9°C31 Jan 2019 | 69 mm12 Jan 1960 | 128 mm1960 · driest 1 mm in 1981 | 132 |
| February | 23.3°C28 Feb 2024 | -33.3°C1 Feb 2019 | 58 mm9 Feb 2001 | 116 mm2001 · driest 0 mm in 1995 | 131 |
| March | 28.9°C30 Mar 1986 | -25.0°C1 Mar 1962 | 97 mm22 Mar 1916 | 147 mm1916 · driest 0 mm in 1910 | 132 |
| April | 33.3°C22 Apr 1980 | -13.9°C7 Apr 1982 | 99 mm21 Apr 1973 | 242 mm1973 · driest 6 mm in 1915 | 134 |
| May | 39.4°C31 May 1934 | -3.3°C7 May 1974 | 95 mm19 May 1959 | 213 mm1933 · driest 8 mm in 1975 | 134 |
| June | 40.0°C1 Jun 1934 | 1.1°C1 Jun 2003 | 166 mm24 Jun 1898 | 366 mm1993 · driest 10 mm in 1922 | 133 |
| July | 43.3°C14 Jul 1936 | 5.6°C30 Jul 1914 | 100 mm6 Jul 1943 | 242 mm2025 · driest 1 mm in 1916 | 132 |
| August | 38.9°C5 Aug 1918 | 3.9°C30 Aug 1915 | 127 mm5 Aug 1998 | 334 mm2007 · driest 16 mm in 1917 | 129 |
| September | 37.8°C9 Sep 1922 | -5.0°C30 Sep 1899 | 128 mm2 Sep 1942 | 308 mm1938 · driest 2 mm in 1974 | 131 |
| October | 31.7°C6 Oct 1963 | -15.6°C30 Oct 1925 | 88 mm10 Oct 1954 | 178 mm1954 · driest 0 mm in 1952 | 129 |
| November | 25.6°C1 Nov 1933 | -24.4°C30 Nov 1947 | 74 mm17 Nov 1928 | 183 mm1934 · driest 0 mm in 2007 | 130 |
| December | 19.4°C16 Dec 2021 | -31.7°C26 Dec 1903 | 51 mm15 Dec 1971 | 128 mm2015 · driest 6 mm in 1898 | 131 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | 1 | 6 |
| February | 0 | 0 | 26 | 1 | 4 |
| March | <1 | 0 | 23 | 2 | 2 |
| April | 2 | <1 | 9 | 3 | <1 |
| May | 8 | 2 | <1 | 4 | 0 |
| June | 19 | 7 | 0 | 4 | 0 |
| July | 25 | 9 | 0 | 3 | 0 |
| August | 24 | 6 | 0 | 3 | 0 |
| September | 12 | 3 | <1 | 3 | 0 |
| October | 3 | <1 | 6 | 2 | <1 |
| November | 0 | 0 | 19 | 2 | <1 |
| December | 0 | 0 | 28 | 2 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 20% | 4% | 14% | -5.5–2.0°C |
| February | <1% | 18% | 4% | 13% | -3.9–3.9°C |
| March | 4% | 22% | 6% | 22% | 3.2–10.2°C |
| April | 18% | 28% | 10% | 31% | 12.1–18.2°C |
| May | 46% | 29% | 10% | 34% | 18.4–24.6°C |
| June | 68% | 28% | 12% | 32% | 24.3–29.2°C |
| July | 76% | 23% | 10% | 21% | 27.0–31.1°C |
| August | 76% | 23% | 11% | 20% | 25.7–30.1°C |
| September | 62% | 23% | 10% | 23% | 21.5–26.1°C |
| October | 29% | 21% | 7% | 21% | 14.2–20.3°C |
| November | 3% | 21% | 7% | 18% | 5.2–11.0°C |
| December | 0% | 20% | 5% | 16% | -2.9–4.4°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 4911830
- NOAA station
- USC00470696 · BELOIT
- Station distance
- 1.3 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 42.49°, 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.