September
September · June · May
81climate match
United States · 1991–2020
Best time to visit
Mona.
September leads for comfortable weather in Mona: typically 26.6°C by day, 9.8°C at night, with 24 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high26.6°C
Typical low9.8°C
Rain in September24 mm
August
August · July · June
75climate match
May
May · October · September
82climate match
The weakest month is January, scoring 5 against September’s 81 — days reach only 3.9°C, 20° 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
53.9° / -7.1°
Feb
56.8° / -4.9°
Mar
3113° / -1.3°
Apr
4716.8° / 1.6°
May
7422.1° / 6.2°
Jun
7828.4° / 10.9°
Jul
6933° / 15.9°
Aug
7431.7° / 15.2°
Sep
8126.6° / 9.8°
Oct
5918.7° / 3.2°
Nov
2210.6° / -2.4°
Dec
53.7° / -7.1°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 3.9°C | -7.1°C | 33 mm | 5.9 | 9 h 38 | 5 | Strong coverage |
| February | 6.8°C | -4.9°C | 33 mm | 6.4 | 10 h 38 | 5 | Strong coverage |
| March | 13°C | -1.3°C | 35 mm | 6.5 | 11 h 49 | 31 | Strong coverage |
| April | 16.8°C | 1.6°C | 42 mm | 7.5 | 13 h 12 | 47 | Strong coverage |
| May | 22.1°C | 6.2°C | 38 mm | 6.4 | 14 h 21 | 74 | Strong coverage |
| June | 28.4°C | 10.9°C | 20 mm | 2.9 | 14 h 58 | 78 | Strong coverage |
| July | 33°C | 15.9°C | 13 mm | 3 | 14 h 44 | 69 | Strong coverage |
| August | 31.7°C | 15.2°C | 18 mm | 3.7 | 13 h 44 | 74 | Strong coverage |
| September | 26.6°C | 9.8°C | 24 mm | 4 | 12 h 24 | 81 | Strong coverage |
| October | 18.7°C | 3.2°C | 33 mm | 5.4 | 11 h 05 | 59 | Strong coverage |
| November | 10.6°C | -2.4°C | 27 mm | 5.1 | 9 h 55 | 22 | Strong coverage |
| December | 3.7°C | -7.1°C | 32 mm | 5.5 | 9 h 22 | 5 | Strong coverage |
What has changed
Mona runs -0.7°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
-1.0
Feb
-1.0
Mar
+0.5
Apr
-0.7
May
-1.5
Jun
+0.1
Jul
-0.6
Aug
-0.9
Sep
-0.3
Oct
-1.8
Nov
-0.5
Dec
-0.6
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 20.0°C13 Jan 1953 | -27.8°C29 Jan 1949 | 28 mm3 Jan 1997 | 91 mm1997 · driest 0 mm in 1961 | 84 |
| February | 23.9°C29 Feb 1992 | -28.9°C7 Feb 1989 | 33 mm12 Feb 2012 | 90 mm1962 · driest 2 mm in 2015 | 83 |
| March | 31.1°C25 Mar 2026 | -17.8°C2 Mar 1971 | 39 mm21 Mar 1944 | 106 mm2023 · driest 1 mm in 1956 | 83 |
| April | 32.8°C25 Apr 1987 | -10.0°C3 Apr 1945 | 36 mm2 Apr 1986 | 88 mm1999 · driest 4 mm in 1954 | 82 |
| May | 36.7°C31 May 2002 | -10.0°C2 May 2002 | 38 mm3 May 1999 | 109 mm1981 · driest 0 mm in 2012 | 83 |
| June | 43.3°C26 Jun 1970 | -2.2°C14 Jun 1976 | 46 mm1 Jun 1943 | 103 mm1998 · driest 0 mm in 2013 | 83 |
| July | 41.1°C10 Jul 2002 | 3.3°C11 Jul 1983 | 47 mm21 Jul 1943 | 94 mm1985 · driest 0 mm in 2000 | 82 |
| August | 42.8°C8 Aug 1958 | 1.7°C31 Aug 1943 | 35 mm18 Aug 1965 | 205 mm1913 · driest 0 mm in 1956 | 83 |
| September | 41.1°C4 Sep 1950 | -5.0°C18 Sep 1965 | 38 mm18 Sep 1978 | 153 mm1982 · driest 0 mm in 1957 | 84 |
| October | 33.9°C13 Oct 1989 | -13.9°C30 Oct 2019 | 45 mm20 Oct 1979 | 126 mm1946 · driest 0 mm in 1952 | 83 |
| November | 26.1°C3 Nov 1953 | -20.0°C16 Nov 1955 | 32 mm22 Nov 1996 | 92 mm1978 · driest 2 mm in 1959 | 84 |
| December | 21.1°C1 Dec 1995 | -29.4°C23 Dec 1990 | 37 mm30 Dec 1951 | 122 mm1951 · driest 2 mm in 2011 | 84 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 29 | <1 | 6 |
| February | 0 | 0 | 25 | <1 | 5 |
| March | <1 | 0 | 20 | <1 | 3 |
| April | 2 | 0 | 12 | 1 | 1 |
| May | 11 | 2 | 2 | 1 | <1 |
| June | 23 | 13 | <1 | <1 | 0 |
| July | 30 | 27 | 0 | <1 | 0 |
| August | 30 | 24 | 0 | <1 | 0 |
| September | 21 | 7 | <1 | <1 | 0 |
| October | 5 | <1 | 9 | 1 | <1 |
| November | 0 | 0 | 22 | <1 | 3 |
| December | 0 | 0 | 29 | <1 | 6 |
The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 78); on 2011–2025 it is September (84). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 19% | 3% | 19% | 1.0–7.5°C |
| February | 1% | 22% | 2% | 23% | 3.8–10.5°C |
| March | 10% | 23% | 3% | 26% | 9.1–15.2°C |
| April | 35% | 22% | 3% | 22% | 14.2–20.9°C |
| May | 63% | 20% | 3% | 19% | 19.1–25.5°C |
| June | 86% | 11% | 2% | 9% | 25.7–31.5°C |
| July | 89% | 11% | 1% | 9% | 32.0–35.3°C |
| August | 85% | 15% | 2% | 11% | 30.4–34.0°C |
| September | 83% | 13% | 3% | 10% | 24.6–29.7°C |
| October | 51% | 16% | 3% | 15% | 15.9–23.2°C |
| November | 9% | 17% | 3% | 17% | 7.5–14.8°C |
| December | 0% | 19% | 3% | 19% | 1.6–8.4°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 5286072
- NOAA station
- USC00426135 · NEPHI
- Station distance
- 11.8 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 39.82°, 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.