September
September · May · June
United States · 1991–2020
September leads for comfortable weather in Oakland City: typically 26.7°C by day, 13.4°C at night, with 103 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · June
August · July · June
October · April · September
The weakest month is January, scoring 5 against September’s 76 — days reach only 4.2°C, 20° below the 24°C the score treats as ideal.
Month by month
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 4.2°C | -4.9°C | 92 mm | 8.2 | 9 h 46 | 5 | Good coverage |
| February | 7°C | -3.5°C | 74 mm | 6.7 | 10 h 42 | 5 | Good coverage |
| March | 12.5°C | 0.5°C | 102 mm | 9 | 11 h 50 | 21 | Good coverage |
| April | 19.2°C | 6.6°C | 114 mm | 9.4 | 13 h 08 | 52 | Good coverage |
| May | 24.1°C | 12.4°C | 142 mm | 9.5 | 14 h 14 | 74 | Good coverage |
| June | 28.5°C | 17.2°C | 100 mm | 7.9 | 14 h 49 | 68 | Good coverage |
| July | 30.1°C | 18.7°C | 104 mm | 7.7 | 14 h 35 | 59 | Good coverage |
| August | 30.1°C | 17.9°C | 80 mm | 5.9 | 13 h 39 | 66 | Good coverage |
| September | 26.7°C | 13.4°C | 103 mm | 6.2 | 12 h 23 | 76 | Good coverage |
| October | 20.7°C | 7.2°C | 74 mm | 5.9 | 11 h 08 | 67 | Good coverage |
| November | 12.9°C | 1.8°C | 105 mm | 8.1 | 10 h 02 | 25 | Good coverage |
| December | 6.2°C | -3.1°C | 97 mm | 8.7 | 9 h 30 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.1°C13 Jan 2005 | -27.2°C19 Jan 1994 | 63 mm9 Jan 2008 | 177 mm2005 · driest 24 mm in 1992 | 20 |
| February | 25.0°C26 Feb 2000 | -23.3°C5 Feb 1996 | 64 mm6 Feb 2008 | 165 mm2000 · driest 6 mm in 2004 | 20 |
| March | 28.3°C26 Mar 2007 | -16.7°C13 Mar 1998 | 115 mm19 Mar 2008 | 288 mm2008 · driest 39 mm in 1994 | 19 |
| April | 31.1°C14 Apr 2006 | -5.6°C7 Apr 1990 | 86 mm29 Apr 1996 | 242 mm1996 · driest 30 mm in 2004 | 19 |
| May | 33.3°C25 May 1996 | 1.1°C2 May 1994 | 125 mm13 May 2002 | 343 mm1990 · driest 39 mm in 2005 | 19 |
| June | 35.0°C24 Jun 1996 | 5.0°C22 Jun 1992 | 85 mm7 Jun 1996 | 219 mm2000 · driest 39 mm in 1991 | 20 |
| July | 36.7°C28 Jul 1997 | 10.0°C31 Jul 1990 | 76 mm8 Jul 1998 | 201 mm2009 · driest 20 mm in 1997 | 18 |
| August | 36.7°C28 Aug 2003 | 7.2°C6 Aug 1990 | 87 mm24 Aug 2000 | 311 mm2000 · driest 15 mm in 2008 | 20 |
| September | 38.3°C10 Sep 2002 | 1.7°C23 Sep 1995 | 105 mm3 Sep 1993 | 250 mm1993 · driest 14 mm in 1995 | 21 |
| October | 32.8°C8 Oct 2007 | -3.3°C19 Oct 1992 | 64 mm17 Oct 2006 | 204 mm2001 · driest 15 mm in 2000 | 20 |
| November | 28.3°C9 Nov 1999 | -10.6°C22 Nov 2008 | 92 mm15 Nov 1993 | 214 mm1993 · driest 7 mm in 1999 | 20 |
| December | 22.8°C7 Dec 1998 | -27.8°C23 Dec 1989 | 70 mm17 Dec 2001 | 181 mm1990 · driest 39 mm in 1992 | 20 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 24 | 3 | 2 |
| February | <1 | 0 | 20 | 3 | 1 |
| March | 1 | 0 | 15 | 3 | <1 |
| April | 5 | <1 | 4 | 4 | 0 |
| May | 14 | 4 | 0 | 5 | 0 |
| June | 25 | 13 | 0 | 3 | 0 |
| July | 29 | 17 | 0 | 3 | 0 |
| August | 28 | 17 | 0 | 2 | 0 |
| September | 20 | 7 | 0 | 3 | 0 |
| October | 8 | 1 | 3 | 3 | 0 |
| November | 1 | 0 | 13 | 3 | <1 |
| December | 0 | 0 | 21 | 3 | 1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 25% | 9% | 25% | 1.5–8.1°C |
| February | 2% | 25% | 9% | 25% | 3.7–9.9°C |
| March | 12% | 30% | 11% | 37% | 10.1–15.5°C |
| April | 31% | 30% | 12% | 38% | 16.7–21.3°C |
| May | 54% | 30% | 13% | 36% | 21.7–26.1°C |
| June | 73% | 26% | 11% | 28% | 26.6–29.7°C |
| July | 76% | 23% | 10% | 22% | 28.9–31.7°C |
| August | 81% | 19% | 9% | 16% | 28.1–31.8°C |
| September | 74% | 19% | 8% | 15% | 24.6–29.5°C |
| October | 47% | 19% | 8% | 19% | 18.5–22.6°C |
| November | 13% | 26% | 10% | 28% | 9.8–16.7°C |
| December | 1% | 25% | 9% | 29% | 3.4–8.7°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