September
September · June · August
82climate match
United States · 1991–2020
Best time to visit
Vernal.
September leads for comfortable weather in Vernal: typically 24.9°C by day, 7.4°C at night, with 32 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.9°C
Typical low7.4°C
Rain in September32 mm
August
August · July · June
71climate match
May
May · September · June
85climate match
The weakest month is January, scoring 5 against September’s 82 — days reach only -1°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
5-1° / -12.5°
Feb
53.5° / -8.9°
Mar
2511.4° / -3.2°
Apr
4716.2° / 0.4°
May
7221.4° / 5.2°
Jun
7727.9° / 9.5°
Jul
7131.7° / 13°
Aug
7430.3° / 12.2°
Sep
8224.9° / 7.4°
Oct
4916.6° / 1.1°
Nov
118° / -5°
Dec
50.1° / -11.1°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -1°C | -12.5°C | 15 mm | 3.5 | 9 h 35 | 5 | Strong coverage |
| February | 3.5°C | -8.9°C | 15 mm | 3.8 | 10 h 36 | 5 | Strong coverage |
| March | 11.4°C | -3.2°C | 18 mm | 3.1 | 11 h 49 | 25 | Strong coverage |
| April | 16.2°C | 0.4°C | 19 mm | 4.2 | 13 h 13 | 47 | Strong coverage |
| May | 21.4°C | 5.2°C | 28 mm | 4.7 | 14 h 24 | 72 | Strong coverage |
| June | 27.9°C | 9.5°C | 15 mm | 2.9 | 15 h 03 | 77 | Strong coverage |
| July | 31.7°C | 13°C | 15 mm | 3.4 | 14 h 47 | 71 | Strong coverage |
| August | 30.3°C | 12.2°C | 20 mm | 3.5 | 13 h 46 | 74 | Strong coverage |
| September | 24.9°C | 7.4°C | 32 mm | 4.5 | 12 h 25 | 82 | Strong coverage |
| October | 16.6°C | 1.1°C | 29 mm | 4.3 | 11 h 03 | 49 | Strong coverage |
| November | 8°C | -5°C | 13 mm | 3 | 9 h 52 | 11 | Strong coverage |
| December | 0.1°C | -11.1°C | 16 mm | 3.3 | 9 h 18 | 5 | Strong coverage |
What has changed
Vernal 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
+0.3
Feb
+0.1
Mar
+0.4
Apr
-1.2
May
-1.5
Jun
+0.7
Jul
-0.1
Aug
-0.4
Sep
+0.7
Oct
-0.7
Nov
+0.5
Dec
+0.5
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 13.9°C7 Jan 1956 | -38.9°C3 Jan 1952 | 25 mm26 Jan 2009 | 64 mm2023 · driest 0 mm in 1938 | 125 |
| February | 17.8°C26 Feb 1986 | -38.9°C7 Feb 1989 | 28 mm7 Feb 1937 | 56 mm1937 · driest 0 mm in 1954 | 126 |
| March | 28.9°C26 Mar 2026 | -27.8°C2 Mar 1922 | 32 mm29 Mar 1979 | 64 mm1938 · driest 0 mm in 1955 | 125 |
| April | 29.4°C30 Apr 1992 | -17.8°C16 Apr 1922 | 25 mm10 Apr 1905 | 67 mm1935 · driest 0 mm in 1928 | 124 |
| May | 38.3°C30 May 1913 | -11.1°C9 May 1948 | 31 mm9 May 2016 | 87 mm2015 · driest 0 mm in 1974 | 124 |
| June | 41.1°C21 Jun 1919 | -4.4°C2 Jun 1916 | 35 mm1 Jun 1943 | 74 mm1947 · driest 0 mm in 1979 | 124 |
| July | 40.0°C4 Jul 2002 | -3.9°C3 Jul 1921 | 28 mm30 Jul 2021 | 64 mm2011 · driest 0 mm in 1915 | 126 |
| August | 38.9°C7 Aug 2000 | 0.0°C27 Aug 1992 | 40 mm8 Aug 2008 | 95 mm2014 · driest 0 mm in 1938 | 123 |
| September | 36.1°C7 Sep 2022 | -7.2°C18 Sep 1965 | 56 mm23 Sep 2016 | 103 mm2016 · driest 0 mm in 1979 | 122 |
| October | 32.2°C6 Oct 2024 | -16.7°C31 Oct 2019 | 41 mm11 Oct 1981 | 111 mm1981 · driest 0 mm in 1913 | 124 |
| November | 22.2°C8 Nov 1894 | -25.0°C26 Nov 1931 | 41 mm26 Nov 1919 | 70 mm1906 · driest 0 mm in 1976 | 127 |
| December | 18.3°C1 Dec 1995 | -35.6°C14 Dec 1932 | 30 mm19 Dec 1949 | 69 mm2010 · driest 0 mm in 1928 | 123 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 31 | <1 | 4 |
| February | 0 | 0 | 28 | <1 | 3 |
| March | 0 | 0 | 25 | <1 | 1 |
| April | 1 | 0 | 14 | <1 | <1 |
| May | 10 | 1 | 3 | <1 | <1 |
| June | 23 | 12 | <1 | <1 | 0 |
| July | 29 | 23 | 0 | <1 | 0 |
| August | 29 | 19 | 0 | <1 | 0 |
| September | 17 | 4 | 1 | <1 | 0 |
| October | 2 | 0 | 13 | 1 | <1 |
| November | 0 | 0 | 26 | <1 | 1 |
| December | 0 | 0 | 31 | <1 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 10% | <1% | 6% | -6.9–3.3°C |
| February | 0% | 11% | <1% | 6% | -2.5–7.4°C |
| March | 4% | 11% | 2% | 5% | 6.1–13.7°C |
| April | 31% | 13% | 2% | 8% | 13.6–19.8°C |
| May | 65% | 14% | 2% | 10% | 19.3–25.0°C |
| June | 88% | 10% | 2% | 5% | 25.5–30.8°C |
| July | 90% | 10% | 1% | 5% | 29.6–33.6°C |
| August | 88% | 12% | 2% | 7% | 28.5–32.1°C |
| September | 80% | 13% | 3% | 8% | 23.0–27.4°C |
| October | 36% | 12% | 3% | 9% | 14.3–20.5°C |
| November | <1% | 9% | 1% | 4% | 5.1–11.6°C |
| December | 0% | 11% | 1% | 6% | -5.0–4.2°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 5784154
- NOAA station
- USC00429111 · VERNAL
- Station distance
- 1.8 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 26 usable years
- Daylight
- Calculated from latitude 40.46°, 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.