September
September · May · June
75climate match
United States · 1991–2020
Best time to visit
Morristown.
September leads for comfortable weather in Morristown: typically 25.8°C by day, 13°C at night, with 118 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high25.8°C
Typical low13°C
Rain in September118 mm
August
August · July · June
68climate match
May
May · October · April
71climate match
The weakest month is January, scoring 5 against September’s 75 — days reach only 4.5°C, 19° 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
54.5° / -6°
Feb
55.8° / -5.3°
Mar
1210.2° / -1.1°
Apr
4517.2° / 4.4°
May
7022.7° / 9.8°
Jun
6927.8° / 15.2°
Jul
5630.5° / 18.2°
Aug
6229.6° / 17.2°
Sep
7525.8° / 13°
Oct
5319° / 6.3°
Nov
2512.5° / 1°
Dec
57.2° / -2.8°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 4.5°C | -6°C | 85 mm | 7.9 | 9 h 33 | 5 | Strong coverage |
| February | 5.8°C | -5.3°C | 74 mm | 6.7 | 10 h 35 | 5 | Strong coverage |
| March | 10.2°C | -1.1°C | 103 mm | 7.9 | 11 h 49 | 12 | Strong coverage |
| April | 17.2°C | 4.4°C | 97 mm | 8.5 | 13 h 14 | 45 | Strong coverage |
| May | 22.7°C | 9.8°C | 103 mm | 10.1 | 14 h 26 | 70 | Strong coverage |
| June | 27.8°C | 15.2°C | 121 mm | 9.4 | 15 h 05 | 69 | Strong coverage |
| July | 30.5°C | 18.2°C | 119 mm | 9.2 | 14 h 50 | 56 | Strong coverage |
| August | 29.6°C | 17.2°C | 111 mm | 8.6 | 13 h 48 | 62 | Strong coverage |
| September | 25.8°C | 13°C | 118 mm | 7.5 | 12 h 25 | 75 | Strong coverage |
| October | 19°C | 6.3°C | 114 mm | 7.8 | 11 h 03 | 53 | Strong coverage |
| November | 12.5°C | 1°C | 92 mm | 7.3 | 9 h 51 | 25 | Strong coverage |
| December | 7.2°C | -2.8°C | 112 mm | 8.4 | 9 h 16 | 5 | Strong coverage |
What has changed
Morristown runs +1.4°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
+1.9
Feb
+1.9
Mar
+1.1
Apr
+1.6
May
+1.1
Jun
+1.3
Jul
+1.9
Aug
+1.3
Sep
+1.5
Oct
+0.8
Nov
+0.1
Dec
+1.9
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 22.8°C27 Jan 1950 | -31.7°C28 Jan 1935 | 82 mm10 Jan 2024 | 267 mm1979 · driest 0 mm in 2026 | 96 |
| February | 26.1°C22 Feb 2018 | -32.2°C9 Feb 1934 | 71 mm25 Feb 2016 | 169 mm2008 · driest 12 mm in 2002 | 94 |
| March | 31.7°C31 Mar 1998 | -21.1°C1 Mar 1934 | 104 mm14 Mar 2010 | 304 mm2010 · driest 16 mm in 2006 | 95 |
| April | 35.6°C18 Apr 2002 | -11.1°C4 Apr 1954 | 136 mm16 Apr 2007 | 311 mm2007 · driest 1 mm in 2023 | 95 |
| May | 36.1°C20 May 1962 | -3.9°C10 May 1986 | 113 mm29 May 1968 | 282 mm1968 · driest 4 mm in 2023 | 95 |
| June | 39.4°C10 Jun 2011 | -0.6°C8 Jun 1932 | 146 mm6 Jun 1992 | 285 mm1972 · driest 1 mm in 1949 | 94 |
| July | 41.7°C7 Jul 2010 | 5.0°C15 Jul 1940 | 129 mm25 Jul 1997 | 348 mm1945 · driest 11 mm in 1955 | 95 |
| August | 40.0°C10 Aug 2001 | 1.7°C30 Aug 1934 | 223 mm28 Aug 1971 | 372 mm1942 · driest 5 mm in 1964 | 92 |
| September | 37.8°C9 Sep 2015 | -3.3°C27 Sep 1947 | 193 mm17 Sep 1999 | 324 mm1999 · driest 4 mm in 2024 | 94 |
| October | 34.4°C3 Oct 2019 | -10.6°C28 Oct 1936 | 121 mm30 Oct 1973 | 355 mm2005 · driest 0 mm in 2024 | 95 |
| November | 28.9°C3 Nov 1950 | -20.6°C26 Nov 1938 | 134 mm9 Nov 1972 | 289 mm1932 · driest 4 mm in 2021 | 92 |
| December | 24.4°C5 Dec 1998 | -26.7°C28 Dec 1933 | 77 mm31 Dec 1948 | 276 mm1983 · driest 4 mm in 1955 | 94 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 26 | 3 | 3 |
| February | 0 | 0 | 24 | 3 | 3 |
| March | <1 | 0 | 19 | 3 | 2 |
| April | 4 | <1 | 6 | 3 | <1 |
| May | 11 | 4 | <1 | 4 | 0 |
| June | 22 | 11 | 0 | 4 | 0 |
| July | 29 | 18 | 0 | 4 | 0 |
| August | 28 | 16 | 0 | 4 | 0 |
| September | 18 | 5 | 0 | 4 | 0 |
| October | 4 | <1 | 3 | 4 | 0 |
| November | <1 | 0 | 14 | 3 | <1 |
| December | 0 | 0 | 23 | 4 | 1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 25% | 10% | 27% | 0.5–7.3°C |
| February | <1% | 25% | 9% | 25% | 2.4–8.2°C |
| March | 6% | 28% | 11% | 32% | 7.0–12.8°C |
| April | 23% | 30% | 11% | 36% | 14.2–18.8°C |
| May | 51% | 32% | 12% | 42% | 20.1–24.6°C |
| June | 68% | 30% | 11% | 36% | 25.3–29.3°C |
| July | 71% | 29% | 12% | 34% | 28.5–32.0°C |
| August | 72% | 28% | 12% | 29% | 27.2–30.7°C |
| September | 69% | 25% | 11% | 25% | 23.4–27.1°C |
| October | 37% | 23% | 10% | 23% | 17.1–21.5°C |
| November | 7% | 25% | 11% | 25% | 10.1–15.0°C |
| December | <1% | 26% | 11% | 27% | 3.2–8.9°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 5101427
- NOAA station
- USC00281335 · CANOE BROOK
- Station distance
- 12.3 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 27 usable years
- Daylight
- Calculated from latitude 40.80°, 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.