September
September · June · May
79climate match
United States · 1991–2020
Best time to visit
Greybull.
September leads for comfortable weather in Greybull: typically 25.2°C by day, 5.9°C at night, with 22 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high25.2°C
Typical low5.9°C
Rain in September22 mm
July
July · August · June
67climate match
May
May · September · June
84climate match
The weakest month is January, scoring 5 against September’s 79 — days reach only -1.3°C, 25° below the 24°C the score treats as ideal, and nights drop to -15.5°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
5-1.3° / -15.5°
Feb
52.8° / -12°
Mar
2111.3° / -5.4°
Apr
4816.6° / 0°
May
7421.9° / 5.5°
Jun
7827.6° / 10.2°
Jul
6832.8° / 13.4°
Aug
6931.6° / 11.6°
Sep
7925.2° / 5.9°
Oct
4816.9° / -0.6°
Nov
56.8° / -8.1°
Dec
50.2° / -13.7°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -1.3°C | -15.5°C | 7 mm | 2.2 | 9 h 11 | 5 | Good coverage |
| February | 2.8°C | -12°C | 9 mm | 2.1 | 10 h 22 | 5 | Good coverage |
| March | 11.3°C | -5.4°C | 6 mm | 1.9 | 11 h 46 | 21 | Strong coverage |
| April | 16.6°C | 0°C | 16 mm | 3.5 | 13 h 24 | 48 | Strong coverage |
| May | 21.9°C | 5.5°C | 30 mm | 5.3 | 14 h 46 | 74 | Strong coverage |
| June | 27.6°C | 10.2°C | 30 mm | 4.8 | 15 h 31 | 78 | Strong coverage |
| July | 32.8°C | 13.4°C | 12 mm | 2.5 | 15 h 14 | 68 | Good coverage |
| August | 31.6°C | 11.6°C | 7 mm | 1.9 | 14 h 02 | 69 | Good coverage |
| September | 25.2°C | 5.9°C | 22 mm | 3 | 12 h 28 | 79 | Good coverage |
| October | 16.9°C | -0.6°C | 14 mm | 2.5 | 10 h 54 | 48 | Good coverage |
| November | 6.8°C | -8.1°C | 11 mm | 1.9 | 9 h 32 | 5 | Good coverage |
| December | 0.2°C | -13.7°C | 6 mm | 1.5 | 8 h 51 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 12.8°C2 Jan 1998 | -37.8°C12 Jan 1997 | 28 mm3 Jan 1996 | 42 mm1996 · driest 0 mm in 2004 | 28 |
| February | 18.9°C29 Feb 1992 | -39.4°C2 Feb 1996 | 25 mm21 Feb 1993 | 53 mm1993 · driest 0 mm in 2016 | 27 |
| March | 27.2°C24 Mar 2012 | -30.6°C4 Mar 2019 | 15 mm23 Mar 1994 | 24 mm1990 · driest 0 mm in 1988 | 29 |
| April | 32.2°C24 Apr 2012 | -14.4°C12 Apr 1997 | 26 mm28 Apr 1978 | 53 mm1978 · driest 1 mm in 2013 | 31 |
| May | 35.6°C29 May 2014 | -7.2°C9 May 2002 | 70 mm7 May 1988 | 94 mm1988 · driest 3 mm in 2001 | 30 |
| June | 42.8°C30 Jun 2010 | 0.6°C3 Jun 1990 | 33 mm20 Jun 2008 | 76 mm1997 · driest 2 mm in 2016 | 28 |
| July | 42.8°C17 Jul 2010 | 3.9°C7 Jul 2010 | 27 mm3 Jul 1993 | 53 mm1993 · driest 0 mm in 2003 | 27 |
| August | 41.7°C12 Aug 2018 | 0.6°C26 Aug 1992 | 9 mm9 Aug 2001 | 18 mm1976 · driest 0 mm in 2008 | 29 |
| September | 37.2°C2 Sep 1976 | -4.4°C27 Sep 1996 | 40 mm20 Sep 2004 | 72 mm2016 · driest 0 mm in 1993 | 30 |
| October | 33.3°C2 Oct 2011 | -20.0°C31 Oct 1991 | 47 mm7 Oct 2011 | 61 mm2011 · driest 0 mm in 2014 | 29 |
| November | 23.3°C1 Nov 1988 | -30.6°C16 Nov 2014 | 43 mm23 Nov 2002 | 46 mm2002 · driest 0 mm in 2004 | 27 |
| December | 20.6°C1 Dec 1995 | -38.3°C22 Dec 1989 | 21 mm14 Dec 1989 | 36 mm1996 · driest 0 mm in 2014 | 28 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 31 | 0 | 3 |
| February | 0 | 0 | 28 | <1 | 3 |
| March | <1 | 0 | 27 | <1 | 1 |
| April | 3 | <1 | 15 | <1 | <1 |
| May | 10 | 3 | 3 | <1 | <1 |
| June | 21 | 11 | 0 | <1 | 0 |
| July | 29 | 24 | 0 | <1 | 0 |
| August | 28 | 22 | 0 | 0 | 0 |
| September | 17 | 7 | 3 | <1 | 0 |
| October | 4 | <1 | 18 | <1 | <1 |
| November | 0 | 0 | 27 | <1 | 2 |
| December | 0 | 0 | 29 | <1 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 7% | <1% | 3% | -4.3–3.0°C |
| February | 0% | 6% | <1% | 2% | -3.2–9.2°C |
| March | 10% | 7% | <1% | 2% | 7.8–14.9°C |
| April | 33% | 11% | 1% | 6% | 13.7–18.8°C |
| May | 59% | 16% | 3% | 13% | 18.4–25.2°C |
| June | 80% | 17% | 2% | 13% | 25.5–30.7°C |
| July | 92% | 9% | <1% | 3% | 30.4–34.9°C |
| August | 93% | 8% | <1% | 3% | 29.3–33.4°C |
| September | 77% | 11% | 2% | 8% | 23.3–27.5°C |
| October | 35% | 7% | 1% | 3% | 15.0–20.3°C |
| November | 3% | 6% | <1% | 2% | 3.3–12.2°C |
| December | <1% | 6% | <1% | 2% | -3.3–3.7°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 5826603
- NOAA station
- USC00484080 · GREYBULL
- Station distance
- 0.2 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 22 usable years
- Daylight
- Calculated from latitude 44.49°, 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.