September
September · June · August
81climate match
United States · 1991–2020
Best time to visit
Monarch.
September leads for comfortable weather in Monarch: typically 24.2°C by day, 6°C at night, with 37 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.2°C
Typical low6°C
Rain in September37 mm
July
July · August · June
68climate match
September
September · May · June
78climate match
The weakest month is January, scoring 5 against September’s 81 — days reach only 2.3°C, 22° below the 24°C the score treats as ideal, and nights drop to -11.1°C.
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
52.3° / -11.1°
Feb
53.5° / -10°
Mar
139.4° / -5.1°
Apr
3113.7° / -1°
May
5318.9° / 3.9°
Jun
7924.9° / 8.4°
Jul
7031° / 12.1°
Aug
7130.3° / 11.1°
Sep
8124.2° / 6°
Oct
4115.5° / -0.4°
Nov
88.2° / -6.6°
Dec
52.6° / -10.9°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 2.3°C | -11.1°C | 16 mm | 4.1 | 9 h 08 | 5 | Strong coverage |
| February | 3.5°C | -10°C | 16 mm | 4.8 | 10 h 20 | 5 | Strong coverage |
| March | 9.4°C | -5.1°C | 26 mm | 6.2 | 11 h 46 | 13 | Strong coverage |
| April | 13.7°C | -1°C | 47 mm | 7.6 | 13 h 25 | 31 | Strong coverage |
| May | 18.9°C | 3.9°C | 68 mm | 9 | 14 h 49 | 53 | Strong coverage |
| June | 24.9°C | 8.4°C | 50 mm | 7.4 | 15 h 35 | 79 | Strong coverage |
| July | 31°C | 12.1°C | 27 mm | 4.5 | 15 h 16 | 70 | Strong coverage |
| August | 30.3°C | 11.1°C | 18 mm | 3.8 | 14 h 04 | 71 | Strong coverage |
| September | 24.2°C | 6°C | 37 mm | 4.7 | 12 h 28 | 81 | Strong coverage |
| October | 15.5°C | -0.4°C | 39 mm | 6.2 | 10 h 53 | 41 | Strong coverage |
| November | 8.2°C | -6.6°C | 19 mm | 4.5 | 9 h 29 | 8 | Strong coverage |
| December | 2.6°C | -10.9°C | 14 mm | 4.1 | 8 h 48 | 5 | Strong coverage |
What has changed
Monarch runs +1.1°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
+2.7
Feb
-1.4
Mar
+1.7
Apr
-0.3
May
-0.3
Jun
+1.3
Jul
+1.9
Aug
+1.2
Sep
+3.0
Oct
-0.1
Nov
+1.6
Dec
+2.1
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.1°C9 Jan 1953 | -37.2°C12 Jan 1997 | 22 mm22 Jan 1948 | 47 mm1994 · driest 1 mm in 2004 | 79 |
| February | 24.4°C21 Feb 1982 | -35.6°C3 Feb 1989 | 24 mm26 Feb 1954 | 68 mm1955 · driest 1 mm in 1992 | 79 |
| March | 28.3°C21 Mar 2026 | -30.6°C25 Mar 1965 | 25 mm31 Mar 2017 | 87 mm2017 · driest 4 mm in 1978 | 79 |
| April | 30.0°C21 Apr 1989 | -18.9°C2 Apr 1975 | 72 mm19 Apr 1948 | 122 mm1963 · driest 5 mm in 1980 | 79 |
| May | 35.0°C13 May 2026 | -10.6°C3 May 1954 | 62 mm7 May 2005 | 173 mm1978 · driest 6 mm in 2009 | 79 |
| June | 41.7°C15 Jun 2021 | -2.8°C3 Jun 1951 | 48 mm15 Jun 1992 | 156 mm1967 · driest 7 mm in 1971 | 79 |
| July | 42.8°C12 Jul 2026 | 1.7°C29 Jul 1971 | 50 mm12 Jul 1952 | 96 mm1958 · driest 1 mm in 1999 | 79 |
| August | 41.1°C7 Aug 1983 | -1.0°C23 Aug 2015 | 26 mm18 Aug 1968 | 77 mm1968 · driest 0 mm in 1970 | 78 |
| September | 40.0°C7 Sep 2022 | -14.4°C25 Sep 1984 | 56 mm24 Sep 2016 | 108 mm2013 · driest 0 mm in 2012 | 78 |
| October | 33.9°C1 Oct 2011 | -23.2°C26 Oct 2020 | 46 mm7 Oct 2011 | 95 mm2011 · driest 1 mm in 1965 | 78 |
| November | 27.2°C3 Nov 2020 | -31.7°C16 Nov 1959 | 22 mm9 Nov 1978 | 61 mm1991 · driest 1 mm in 2020 | 78 |
| December | 25.0°C2 Dec 2021 | -38.3°C24 Dec 1983 | 17 mm14 Dec 1989 | 61 mm1989 · driest 2 mm in 2024 | 78 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 7 |
| February | 0 | 0 | 27 | <1 | 7 |
| March | <1 | 0 | 27 | <1 | 7 |
| April | 2 | 0 | 18 | 1 | 5 |
| May | 6 | <1 | 6 | 2 | <1 |
| June | 16 | 6 | <1 | 1 | <1 |
| July | 28 | 20 | 0 | <1 | 0 |
| August | 27 | 19 | <1 | <1 | 0 |
| September | 16 | 7 | 2 | 1 | <1 |
| October | 4 | <1 | 17 | 1 | 3 |
| November | <1 | 0 | 27 | <1 | 7 |
| December | 0 | 0 | 31 | <1 | 8 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 15% | <1% | 12% | -3.0–6.4°C |
| February | <1% | 18% | <1% | 15% | -1.9–7.7°C |
| March | 6% | 22% | 1% | 21% | 3.7–12.4°C |
| April | 20% | 26% | 4% | 28% | 10.9–16.8°C |
| May | 42% | 28% | 6% | 34% | 16.5–21.5°C |
| June | 68% | 25% | 5% | 26% | 22.1–27.9°C |
| July | 85% | 14% | 2% | 11% | 28.0–33.7°C |
| August | 86% | 13% | 2% | 8% | 27.4–32.4°C |
| September | 68% | 16% | 3% | 13% | 21.0–27.0°C |
| October | 34% | 18% | 3% | 15% | 13.2–19.5°C |
| November | 6% | 16% | 1% | 11% | 4.2–12.1°C |
| December | <1% | 15% | <1% | 10% | -1.7–6.5°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 5832610
- NOAA station
- USW00024029 · SHERIDAN AP
- Station distance
- 16.6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 44.90°, 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.