September
Other strong months: May and June
81/100 weather score
United States · 1991–2020
Best time to visit
Mount Vernon
For Mount Vernon, September has the most comfortable weather in our climate comparison. Typical daytime highs are 26.5°C, nights average 14.6°C, and rainfall totals about 87 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthSeptember
Typical daytime high26.5°C
Typical night-time low14.6°C
September rainfall87 mm
October
Other strong months: April and September
82/100 weather score
Make the answer personal
Choose the weather
that suits you.
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
2 months fit your choices for Mount Vernon
The lowest comfort score is 5 out of 100. January, February and December share that score. In January, that is mainly because days reach only 5.4°C, 19° below the 24°C the score treats as ideal.
Quick answers
Planning a trip to Mount Vernon?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Mount Vernon?
September is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 26.5°C and 87 mm of rain.
What is the hottest month in Mount Vernon?
July is hottest in this record, with a typical daytime high of 30.1°C and a night-time low of 19.3°C.
Which month has the least rain?
November has the lowest monthly rainfall total at 85 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 5.4°C | -3.7°C | 87 mm | 9.2 | 9 h 47 | 5 | Strong coverage |
| February | 7.8°C | -2.1°C | 92 mm | 9.1 | 10 h 43 | 5 | Strong coverage |
| March | 13°C | 2.1°C | 114 mm | 10.3 | 11 h 50 | 23 | Strong coverage |
| April | 19.2°C | 7.3°C | 112 mm | 10.3 | 13 h 08 | 53 | Strong coverage |
| May | 23.9°C | 12.9°C | 138 mm | 10.4 | 14 h 12 | 75 | Strong coverage |
| June | 28.4°C | 17.2°C | 126 mm | 9.8 | 14 h 47 | 63 | Strong coverage |
| July | 30.1°C | 19.3°C | 130 mm | 8.9 | 14 h 33 | 53 | Strong coverage |
| August | 29.8°C | 18.5°C | 94 mm | 8 | 13 h 38 | 62 | Strong coverage |
| September | 26.5°C | 14.6°C | 87 mm | 6.4 | 12 h 23 | 81 | Strong coverage |
| October | 20°C | 8.3°C | 93 mm | 7 | 11 h 08 | 63 | Strong coverage |
| November | 12.9°C | 2.5°C | 85 mm | 8.3 | 10 h 04 | 29 | Strong coverage |
| December | 7.4°C | -1.3°C | 107 mm | 9.5 | 9 h 32 | 5 | Strong coverage |
What has changed
Recent daytime highs are
1.4°C warmer in Mount Vernon.
Each bar shows the difference between the 2011–2025 average daytime high and the 1961–1990 average for the same month at the same station. A blank month does not have enough older observations for a reliable comparison.
Jan
+1.6
Feb
+2.6
Mar
+1.5
Apr
+1.2
May
+1.0
Jun
+1.0
Jul
+1.1
Aug
+0.7
Sep
+1.5
Oct
+1.1
Nov
+0.7
Dec
+2.4
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 26.7°C24 Jan 1943 | -29.4°C24 Jan 1963 | 89 mm11 Jan 1913 | 423 mm1950 · driest 10 mm in 1981 | 143 |
| February | 26.7°C23 Feb 1996 | -28.9°C13 Feb 1899 | 79 mm13 Feb 1989 | 258 mm2018 · driest 13 mm in 1895 | 143 |
| March | 30.0°C25 Mar 1929 | -18.9°C5 Mar 1960 | 141 mm1 Mar 1997 | 351 mm1997 · driest 12 mm in 1910 | 143 |
| April | 32.8°C30 Apr 1942 | -9.4°C18 Apr 1875 | 131 mm3 Apr 2015 | 323 mm2011 · driest 10 mm in 1896 | 143 |
| May | 35.6°C22 May 1941 | -3.3°C10 May 1966 | 110 mm2 May 2010 | 277 mm2004 · driest 15 mm in 1932 | 143 |
| June | 40.0°C29 Jun 1936 | 3.9°C1 Jun 1966 | 128 mm29 Jun 1998 | 297 mm1960 · driest 16 mm in 1988 | 143 |
| July | 42.2°C10 Jul 1936 | 8.3°C7 Jul 1972 | 111 mm20 Jul 1998 | 285 mm1875 · driest 12 mm in 1930 | 143 |
| August | 40.6°C19 Aug 1936 | 5.6°C29 Aug 1965 | 204 mm2 Aug 1932 | 284 mm1974 · driest 7 mm in 1998 | 141 |
| September | 39.4°C5 Sep 1954 | 0.0°C30 Sep 1899 | 138 mm3 Sep 1922 | 265 mm2018 · driest 0 mm in 2019 | 141 |
| October | 36.1°C1 Oct 2019 | -6.7°C28 Oct 1976 | 120 mm7 Oct 2025 | 204 mm2025 · driest 3 mm in 1924 | 142 |
| November | 28.3°C1 Nov 2016 | -19.4°C25 Nov 1950 | 85 mm1 Nov 1919 | 216 mm1919 · driest 12 mm in 1976 | 143 |
| December | 23.9°C2 Dec 1982 | -28.3°C22 Dec 1989 | 92 mm6 Dec 1919 | 258 mm1990 · driest 16 mm in 1965 | 143 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 23 | 3 | 5 |
| February | <1 | 0 | 19 | 3 | 4 |
| March | 1 | 0 | 13 | 4 | 2 |
| April | 5 | 0 | 3 | 4 | <1 |
| May | 15 | 3 | <1 | 5 | 0 |
| June | 26 | 12 | 0 | 4 | 0 |
| July | 30 | 18 | 0 | 4 | 0 |
| August | 29 | 16 | 0 | 3 | 0 |
| September | 19 | 8 | 0 | 3 | 0 |
| October | 7 | <1 | 2 | 3 | 0 |
| November | <1 | 0 | 11 | 3 | <1 |
| December | 0 | 0 | 19 | 4 | 3 |
The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 87); on 2011–2025 it is May (82). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | <1% | 31% | 11% | 37% | 1.6–9.3°C |
| February | 2% | 32% | 10% | 43% | 2.9–10.7°C |
| March | 12% | 34% | 12% | 44% | 9.0–16.0°C |
| April | 30% | 33% | 11% | 41% | 16.0–21.0°C |
| May | 55% | 32% | 12% | 40% | 21.3–26.3°C |
| June | 68% | 31% | 12% | 38% | 25.9–30.1°C |
| July | 71% | 29% | 13% | 32% | 28.0–32.1°C |
| August | 75% | 25% | 10% | 25% | 27.5–31.6°C |
| September | 73% | 21% | 8% | 19% | 23.8–28.6°C |
| October | 44% | 21% | 8% | 21% | 17.4–22.7°C |
| November | 11% | 27% | 10% | 32% | 9.3–15.3°C |
| December | <1% | 30% | 10% | 36% | 3.6–9.9°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
Where these figures
come from.
- Place identity
- GeoNames 4301702
- NOAA station
- USW00093820 · LEXINGTON BLUEGRASS AP
- Station distance
- 10.2 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 38.03°, 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.
Next step
Choose your month.
Then plan the details.
The weather comparison for Mount Vernon is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
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