September
September · May · August
80climate match
United States · 1991–2020
Best time to visit
Belmont.
September leads for comfortable weather in Belmont: typically 25.8°C by day, 13.5°C at night, with 96 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high25.8°C
Typical low13.5°C
Rain in September96 mm
August
August · July · June
78climate match
October
October · April · September
78climate match
The weakest month is January, scoring 5 against September’s 80 — days reach only 2.9°C, 21° 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
52.9° / -6°
Feb
55.6° / -4.6°
Mar
1911.5° / 0.2°
Apr
4418.1° / 6°
May
7123.4° / 11.8°
Jun
6427.9° / 16.8°
Jul
5929.6° / 18.6°
Aug
6829.3° / 17.7°
Sep
8025.8° / 13.5°
Oct
5819.1° / 7.1°
Nov
2211.6° / 1.5°
Dec
55.2° / -3.1°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 2.9°C | -6°C | 96 mm | 8.9 | 9 h 42 | 5 | Strong coverage |
| February | 5.6°C | -4.6°C | 75 mm | 7.4 | 10 h 40 | 5 | Strong coverage |
| March | 11.5°C | 0.2°C | 92 mm | 8.7 | 11 h 50 | 19 | Strong coverage |
| April | 18.1°C | 6°C | 132 mm | 10.8 | 13 h 10 | 44 | Strong coverage |
| May | 23.4°C | 11.8°C | 138 mm | 11.2 | 14 h 18 | 71 | Strong coverage |
| June | 27.9°C | 16.8°C | 137 mm | 9.6 | 14 h 54 | 64 | Strong coverage |
| July | 29.6°C | 18.6°C | 116 mm | 8.3 | 14 h 40 | 59 | Strong coverage |
| August | 29.3°C | 17.7°C | 83 mm | 6.2 | 13 h 42 | 68 | Strong coverage |
| September | 25.8°C | 13.5°C | 96 mm | 6 | 12 h 24 | 80 | Strong coverage |
| October | 19.1°C | 7.1°C | 93 mm | 6.9 | 11 h 06 | 58 | Strong coverage |
| November | 11.6°C | 1.5°C | 101 mm | 7.6 | 9 h 59 | 22 | Strong coverage |
| December | 5.2°C | -3.1°C | 88 mm | 8.7 | 9 h 26 | 5 | Strong coverage |
What has changed
Belmont runs +0.1°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
+0.7
Mar
+0.7
Apr
-0.2
May
-0.2
Jun
+0.2
Jul
-0.2
Aug
-0.3
Sep
+0.3
Oct
-0.2
Nov
-1.1
Dec
+1.2
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 25.6°C26 Jan 1950 | -29.4°C21 Jan 1985 | 86 mm21 Jan 1937 | 377 mm1937 · driest 0 mm in 1900 | 128 |
| February | 24.4°C10 Feb 1932 | -28.9°C12 Feb 1899 | 84 mm8 Feb 2019 | 200 mm1908 · driest 8 mm in 1978 | 130 |
| March | 30.0°C27 Mar 1910 | -18.9°C3 Mar 1980 | 167 mm25 Mar 1913 | 331 mm1913 · driest 1 mm in 1910 | 130 |
| April | 32.8°C24 Apr 1925 | -8.3°C1 Apr 1923 | 93 mm29 Apr 1996 | 277 mm2011 · driest 0 mm in 1896 | 129 |
| May | 36.1°C31 May 1934 | -6.1°C1 May 1994 | 89 mm5 May 2003 | 271 mm1996 · driest 14 mm in 1913 | 129 |
| June | 40.0°C29 Jun 2012 | 2.2°C3 Jun 1910 | 147 mm30 Jun 2025 | 332 mm2025 · driest 6 mm in 1933 | 129 |
| July | 43.3°C15 Jul 1936 | 7.8°C26 Jul 1911 | 140 mm13 Jul 1979 | 299 mm1979 · driest 17 mm in 1911 | 130 |
| August | 40.0°C8 Aug 1930 | 5.0°C31 Aug 1915 | 126 mm13 Aug 1925 | 258 mm1915 · driest 0 mm in 2019 | 127 |
| September | 39.4°C6 Sep 1922 | -3.3°C30 Sep 1899 | 111 mm9 Sep 2018 | 259 mm1993 · driest 4 mm in 2004 | 127 |
| October | 35.6°C4 Oct 1954 | -8.3°C29 Oct 1925 | 105 mm5 Oct 2000 | 294 mm1919 · driest 2 mm in 2024 | 128 |
| November | 28.9°C1 Nov 1950 | -18.9°C30 Nov 1958 | 80 mm3 Nov 1936 | 224 mm1985 · driest 16 mm in 1965 | 127 |
| December | 23.3°C3 Dec 1982 | -28.9°C23 Dec 1989 | 97 mm22 Dec 2013 | 207 mm1957 · driest 9 mm in 1976 | 130 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 26 | 3 | 5 |
| February | 0 | 0 | 22 | 3 | 3 |
| March | <1 | 0 | 17 | 3 | 1 |
| April | 4 | <1 | 4 | 5 | <1 |
| May | 14 | 3 | <1 | 5 | 0 |
| June | 24 | 11 | 0 | 5 | 0 |
| July | 29 | 16 | 0 | 4 | 0 |
| August | 28 | 14 | 0 | 2 | 0 |
| September | 18 | 6 | 0 | 3 | 0 |
| October | 6 | <1 | 2 | 3 | <1 |
| November | <1 | 0 | 13 | 4 | <1 |
| December | 0 | 0 | 23 | 3 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 28% | 10% | 32% | -0.3–7.2°C |
| February | 1% | 26% | 9% | 29% | 1.4–9.6°C |
| March | 11% | 31% | 13% | 39% | 8.1–15.4°C |
| April | 30% | 34% | 13% | 44% | 15.7–21.1°C |
| May | 56% | 33% | 13% | 42% | 21.3–26.8°C |
| June | 69% | 30% | 13% | 36% | 26.4–30.8°C |
| July | 75% | 25% | 11% | 27% | 28.6–32.8°C |
| August | 78% | 22% | 9% | 22% | 27.9–31.9°C |
| September | 73% | 22% | 10% | 20% | 23.9–29.0°C |
| October | 45% | 21% | 9% | 22% | 18.0–22.6°C |
| November | 10% | 26% | 10% | 28% | 9.0–14.9°C |
| December | <1% | 27% | 10% | 32% | 2.5–9.1°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 4254374
- NOAA station
- USC00120784 · BLOOMINGTON INDIANA UNIV
- Station distance
- 15.2 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 28 usable years
- Daylight
- Calculated from latitude 39.15°, 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.