September
September · May · October
United States · 1991–2020
September leads for comfortable weather in Bexar: typically 28.1°C by day, 15°C at night, with 98 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · October
June · August · July
October · April · May
The weakest month is January, scoring 5 against September’s 75 — days reach only 7.8°C, 16° below the 24°C the score treats as ideal, and nights drop to -4.1°C.
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 | 7.8°C | -4.1°C | 87 mm | 6.8 | 9 h 56 | 5 | Good coverage |
| February | 9.5°C | -2.9°C | 92 mm | 6.8 | 10 h 48 | 9 | Good coverage |
| March | 16.1°C | 2.6°C | 124 mm | 9 | 11 h 51 | 34 | Good coverage |
| April | 21.6°C | 7.4°C | 139 mm | 8.3 | 13 h 04 | 59 | Good coverage |
| May | 25.2°C | 12.6°C | 129 mm | 9.3 | 14 h 04 | 73 | Good coverage |
| June | 30.4°C | 17.7°C | 90 mm | 6.9 | 14 h 37 | 63 | Good coverage |
| July | 32.1°C | 19.9°C | 101 mm | 6.8 | 14 h 24 | 52 | Good coverage |
| August | 31.7°C | 19.2°C | 88 mm | 7 | 13 h 32 | 56 | Good coverage |
| September | 28.1°C | 15°C | 98 mm | 5.7 | 12 h 22 | 75 | Good coverage |
| October | 21.5°C | 8°C | 95 mm | 7 | 11 h 12 | 67 | Good coverage |
| November | 15.3°C | 1.9°C | 120 mm | 7.3 | 10 h 11 | 32 | Good coverage |
| December | 9.3°C | -2.5°C | 98 mm | 6.9 | 9 h 42 | 8 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 23.9°C30 Jan 2008 | -20.6°C17 Jan 2024 | 99 mm13 Jan 2013 | 168 mm2013 · driest 15 mm in 2003 | 24 |
| February | 31.1°C28 Feb 2024 | -21.1°C16 Feb 2021 | 91 mm13 Feb 2007 | 198 mm2019 · driest 14 mm in 2026 | 24 |
| March | 34.4°C23 Mar 2026 | -15.0°C6 Mar 2015 | 157 mm19 Mar 2008 | 387 mm2008 · driest 43 mm in 2003 | 24 |
| April | 33.9°C19 Apr 2006 | -5.6°C8 Apr 2009 | 143 mm5 Apr 2025 | 354 mm2011 · driest 34 mm in 2012 | 25 |
| May | 36.1°C27 May 2012 | 0.0°C4 May 2013 | 97 mm3 May 2022 | 311 mm2011 · driest 9 mm in 2005 | 25 |
| June | 42.8°C29 Jun 2012 | 8.3°C1 Jun 2021 | 73 mm5 Jun 2025 | 225 mm2025 · driest 4 mm in 2022 | 25 |
| July | 41.7°C31 Jul 2012 | 11.1°C4 Jul 2013 | 105 mm19 Jul 2002 | 201 mm2024 · driest 6 mm in 2026 | 25 |
| August | 43.9°C4 Aug 2011 | 9.4°C15 Aug 2004 | 90 mm10 Aug 2023 | 223 mm2016 · driest 11 mm in 2025 | 24 |
| September | 36.7°C1 Sep 2013 | 2.8°C29 Sep 2003 | 130 mm23 Sep 2006 | 255 mm2009 · driest 0 mm in 2004 | 24 |
| October | 35.0°C3 Oct 2019 | -5.6°C30 Oct 2017 | 83 mm10 Oct 2003 | 356 mm2009 · driest 10 mm in 2010 | 24 |
| November | 28.9°C1 Nov 2016 | -12.2°C13 Nov 2019 | 109 mm18 Nov 2003 | 284 mm2015 · driest 16 mm in 2017 | 24 |
| December | 25.0°C29 Dec 2025 | -20.6°C23 Dec 2022 | 90 mm28 Dec 2015 | 235 mm2015 · driest 5 mm in 2025 | 24 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 23 | 3 | <1 |
| February | <1 | <1 | 20 | 3 | <1 |
| March | 3 | <1 | 12 | 4 | <1 |
| April | 9 | 1 | 2 | 4 | <1 |
| May | 18 | 5 | <1 | 5 | 0 |
| June | 28 | 18 | 0 | 3 | 0 |
| July | 30 | 24 | 0 | 3 | 0 |
| August | 30 | 21 | 0 | 3 | 0 |
| September | 23 | 11 | 0 | 3 | 0 |
| October | 10 | 2 | 2 | 3 | 0 |
| November | 2 | 0 | 12 | 3 | <1 |
| December | 0 | 0 | 22 | 3 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 2% | 20% | 8% | 18% | 4.9–10.2°C |
| February | 10% | 22% | 9% | 21% | 5.7–13.2°C |
| March | 26% | 26% | 13% | 29% | 13.5–20.7°C |
| April | 47% | 27% | 13% | 30% | 19.6–23.9°C |
| May | 60% | 29% | 14% | 32% | 23.4–27.3°C |
| June | 78% | 22% | 10% | 21% | 28.7–32.4°C |
| July | 76% | 21% | 10% | 19% | 30.1–33.9°C |
| August | 75% | 20% | 8% | 18% | 29.5–34.1°C |
| September | 80% | 20% | 10% | 17% | 26.1–30.3°C |
| October | 51% | 19% | 9% | 19% | 20.0–23.8°C |
| November | 22% | 23% | 11% | 21% | 12.3–17.5°C |
| December | 5% | 21% | 10% | 20% | 7.6–12.2°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