San Francisco Weather Records (MXN00028204)

Record envelope, standing records and threshold days for San Francisco (MXN00028204), Mexico, with 31 years of record.

Key Facts for San Francisco

San Francisco (MXN00028204) is a weather station in Mexico at 24.97 latitude and -98.30 longitude, 45 m (147 ft) above sea level.
The station reports from 1979 to 2009, 31 years of record.
1,464 records set at San Francisco still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
San Francisco set a daily record high maximum temperature of 47.8 C (118.0 F) on 31 August 2009.

About the Station

Location: Mexico, 24.97 latitude, -98.30 longitude.
Elevation: 45 m (147 ft).
Period of record: 1979 to 2009, 31 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at San Francisco. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at San Francisco, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	40.6 C (105.1 F)	-1.1 C (30.0 F)	n/a	n/a
Feb	45.0 C (113.0 F)	-1.1 C (30.0 F)	n/a	n/a
Mar	50.0 C (122.0 F)	0.6 C (33.1 F)	n/a	n/a
Apr	50.0 C (122.0 F)	0.6 C (33.1 F)	n/a	n/a
May	46.7 C (116.1 F)	5.6 C (42.1 F)	n/a	n/a
Jun	45.6 C (114.1 F)	8.9 C (48.0 F)	n/a	n/a
Jul	48.9 C (120.0 F)	11.7 C (53.1 F)	n/a	n/a
Aug	48.9 C (120.0 F)	10.0 C (50.0 F)	n/a	n/a
Sep	45.6 C (114.1 F)	6.7 C (44.1 F)	n/a	n/a
Oct	43.9 C (111.0 F)	0.6 C (33.1 F)	n/a	n/a
Nov	40.6 C (105.1 F)	0.6 C (33.1 F)	n/a	n/a
Dec	42.8 C (109.0 F)	-3.3 C (26.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Francisco still stand. 2008 holds the most, with 159.

Standing records at San Francisco by the year they were set
Year set	Standing records
1979	48
1980	49
1981	24
1982	65
1983	60
1984	45
1985	60
1986	32
1987	42
1988	63
1989	44
1990	56
1991	36
1992	20
1993	32
1994	37
1995	40
1996	24
1997	11
1998	11
1999	26
2000	30
2001	43
2002	60
2003	22
2004	32
2005	29
2006	25
2007	134
2008	159
2009	105

Wettest Day of Each Month

Jun: 362.0 mm (14.3 in)

The wettest day on record for each calendar month at San Francisco. The most was 362.0 mm (14.3 in) on 29 June 1991.

Record daily precipitation for each month at San Francisco
Month	Record daily precipitation (mm)	Date
Jan	59.9 mm (2.4 in)	30 January 1984
Feb	53.8 mm (2.1 in)	25 February 1983
Mar	74.9 mm (2.9 in)	10 March 1997
Apr	74.9 mm (2.9 in)	6 April 1991
May	91.9 mm (3.6 in)	25 May 2007
Jun	362.0 mm (14.3 in)	29 June 1991
Jul	199.9 mm (7.9 in)	19 July 2005
Aug	87.9 mm (3.5 in)	16 August 1988
Sep	105.9 mm (4.2 in)	1 September 1990
Oct	95.0 mm (3.7 in)	31 October 2002
Nov	69.9 mm (2.8 in)	16 November 2001
Dec	72.9 mm (2.9 in)	2 December 1979

Period of Record Coverage

1979 to 2009

31 years of record at San Francisco, 1979 to 2009. 7 years have data for under 90 percent of days and are left out of rankings: 1985, 1987, 1988, 1989, 1997, 1998, 2009.

Days with data per year at San Francisco
Year	Days with data	Share of year	Complete
1979	350	96%	Yes
1980	359	98%	Yes
1981	363	99%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	362	99%	Yes
1985	327	90%	No
1986	358	98%	Yes
1987	251	69%	No
1988	222	61%	No
1989	280	77%	No
1990	365	100%	Yes
1991	331	91%	Yes
1992	336	92%	Yes
1993	365	100%	Yes
1994	364	100%	Yes
1995	365	100%	Yes
1996	365	100%	Yes
1997	304	83%	No
1998	304	83%	No
1999	365	100%	Yes
2000	366	100%	Yes
2001	363	99%	Yes
2002	352	96%	Yes
2003	350	96%	Yes
2004	359	98%	Yes
2005	339	93%	Yes
2006	358	98%	Yes
2007	334	92%	Yes
2008	365	100%	Yes
2009	178	49%	No

Latest Records

Latest records at San Francisco
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
31 August 2009	San Francisco, MX	daily high max	47.8 C (118.0 F)	5.0 C (9.0 F)	19 years	20 of 100 (Routine)
30 August 2009	San Francisco, MX	monthly high max (Tie)	48.9 C (120.0 F)	tie	0 years	3 of 100 (Routine)
29 August 2009	San Francisco, MX	daily low min	13.9 C (57.0 F)	1.1 C (2.0 F)	24 years	13 of 100 (Routine)
29 August 2009	San Francisco, MX	monthly high max (Tie)	48.9 C (120.0 F)	tie	0 years	3 of 100 (Routine)
28 August 2009	San Francisco, MX	daily high max	47.8 C (118.0 F)	2.8 C (5.0 F)	24 years	17 of 100 (Routine)
27 August 2009	San Francisco, MX	monthly high max (Tie)	48.9 C (120.0 F)	tie	0 years	3 of 100 (Routine)
26 August 2009	San Francisco, MX	daily high max	45.6 C (114.1 F)	5.0 C (9.0 F)	2 years	15 of 100 (Routine)
26 August 2009	San Francisco, MX	daily low min (Tie)	15.0 C (59.0 F)	tie	2 years	0 of 100 (Routine)
25 August 2009	San Francisco, MX	daily high max	47.8 C (118.0 F)	6.1 C (11.0 F)	2 years	18 of 100 (Routine)
24 August 2009	San Francisco, MX	daily high max	45.0 C (113.0 F)	3.3 C (5.9 F)	11 years	14 of 100 (Routine)
23 August 2009	San Francisco, MX	daily high max	46.7 C (116.1 F)	2.8 C (5.0 F)	0 years	10 of 100 (Routine)
22 August 2009	San Francisco, MX	monthly high max	48.9 C (120.0 F)	1.1 C (2.0 F)	0 years	15 of 100 (Routine)
22 August 2009	San Francisco, MX	daily low min	15.0 C (59.0 F)	0.6 C (1.1 F)	24 years	11 of 100 (Routine)
21 August 2009	San Francisco, MX	monthly high max (Tie)	47.8 C (118.0 F)	tie	0 years	3 of 100 (Routine)
20 August 2009	San Francisco, MX	daily high max	45.6 C (114.1 F)	1.7 C (3.1 F)	2 years	7 of 100 (Routine)
19 August 2009	San Francisco, MX	monthly high max (Tie)	47.8 C (118.0 F)	tie	0 years	3 of 100 (Routine)
18 August 2009	San Francisco, MX	daily high max	46.7 C (116.1 F)	2.8 C (5.0 F)	19 years	15 of 100 (Routine)
18 August 2009	San Francisco, MX	daily low min (Tie)	15.6 C (60.1 F)	tie	27 years	2 of 100 (Routine)
17 August 2009	San Francisco, MX	daily high max	45.6 C (114.1 F)	1.7 C (3.1 F)	0 years	7 of 100 (Routine)
16 August 2009	San Francisco, MX	daily high max	46.7 C (116.1 F)	1.1 C (2.0 F)	2 years	5 of 100 (Routine)

Climate Trend

20 complete years, 1979 to 2008

One stripe for each of 20 complete years at San Francisco, 1979 to 2008. Blue stripes are years cooler than the station's own mean of 24.0 C (75.2 F); red stripes are warmer. The coolest year was 1983, at 21.7 C (71.1 F), and the warmest was 1995, at 27.6 C (81.7 F). The strongest colour marks a difference of 3.6 C (6.5 F).

Annual mean temperature at San Francisco as warming stripes, 1979 to 2008
Year	Annual mean temperature	Difference from the station mean
1979	22.6 C	-1.42 C
1980	22.3 C	-1.67 C
1981	22.7 C	-1.29 C
1982	22.8 C	-1.22 C
1983	21.7 C	-2.28 C
1984	22.9 C	-1.09 C
1986	22.0 C	-2.03 C
1990	24.4 C	+0.39 C
1993	24.6 C	+0.61 C
1994	27.3 C	+3.24 C
1995	27.6 C	+3.58 C
1996	26.2 C	+2.20 C
1999	23.5 C	-0.53 C
2000	24.8 C	+0.81 C
2001	24.3 C	+0.31 C
2002	24.8 C	+0.80 C
2004	23.4 C	-0.64 C
2005	23.9 C	-0.16 C
2006	24.3 C	+0.25 C
2008	24.1 C	+0.08 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1979 to 2009

Yearly extremes at San Francisco: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	50.0 C (122.0 F)	2008	41.7 C (107.1 F)	31
Coldest night (TNn)	-3.3 C (26.1 F)	1983	0.6 C (33.1 F)	31
Wettest day (Rx1day)	362.0 mm (14.3 in)	1991	67.8 mm (2.7 in)	31
Wettest five days (Rx5day)	470.8 mm (18.5 in)	1991	114.6 mm (4.5 in)	31
Longest dry spell (CDD)	194 days	1998	55 days	31

Hottest day (TXx)

The hottest day of the year at San Francisco, 1979 to 2009. The record is 50.0 C (122.0 F) in 2008, marked on the chart; the median year is 41.7 C (107.1 F).

Hottest day (TXx) at San Francisco by year
Year	Hottest day (TXx)
1979	40.0 C (104.0 F)
1980	45.0 C (113.0 F)
1981	38.9 C (102.0 F)
1982	42.8 C (109.0 F)
1983	42.8 C (109.0 F)
1984	45.0 C (113.0 F)
1985	40.0 C (104.0 F)
1986	40.6 C (105.1 F)
1987	40.0 C (104.0 F)
1988	46.7 C (116.1 F)
1989	41.7 C (107.1 F)
1990	43.9 C (111.0 F)
1991	40.0 C (104.0 F)
1992	40.0 C (104.0 F)
1993	40.0 C (104.0 F)
1994	42.8 C (109.0 F)
1995	41.7 C (107.1 F)
1996	41.7 C (107.1 F)
1997	42.8 C (109.0 F)
1998	41.7 C (107.1 F)
1999	42.8 C (109.0 F)
2000	45.0 C (113.0 F)
2001	41.7 C (107.1 F)
2002	45.6 C (114.1 F)
2003	40.6 C (105.1 F)
2004	42.8 C (109.0 F)
2005	41.7 C (107.1 F)
2006	40.0 C (104.0 F)
2007	45.6 C (114.1 F)
2008	50.0 C (122.0 F)
2009	48.9 C (120.0 F)

Coldest night (TNn)

The coldest night of the year at San Francisco, 1979 to 2009. The record is -3.3 C (26.1 F) in 1983, marked on the chart; the median year is 0.6 C (33.1 F).

Coldest night (TNn) at San Francisco by year
Year	Coldest night (TNn)
1979	0.6 C (33.1 F)
1980	0.6 C (33.1 F)
1981	0.6 C (33.1 F)
1982	-1.1 C (30.0 F)
1983	-3.3 C (26.1 F)
1984	0.6 C (33.1 F)
1985	-1.1 C (30.0 F)
1986	1.7 C (35.1 F)
1987	1.7 C (35.1 F)
1988	0.0 C (32.0 F)
1989	0.0 C (32.0 F)
1990	3.9 C (39.0 F)
1991	5.6 C (42.1 F)
1992	5.0 C (41.0 F)
1993	2.8 C (37.0 F)
1994	5.0 C (41.0 F)
1995	5.0 C (41.0 F)
1996	2.8 C (37.0 F)
1997	0.0 C (32.0 F)
1998	0.0 C (32.0 F)
1999	0.6 C (33.1 F)
2000	0.6 C (33.1 F)
2001	0.6 C (33.1 F)
2002	0.0 C (32.0 F)
2003	0.0 C (32.0 F)
2004	0.0 C (32.0 F)
2005	0.6 C (33.1 F)
2006	0.0 C (32.0 F)
2007	0.6 C (33.1 F)
2008	0.0 C (32.0 F)
2009	0.6 C (33.1 F)

Wettest day (Rx1day)

The wettest day of the year at San Francisco, 1979 to 2009. The record is 362.0 mm (14.3 in) in 1991, marked on the chart; the median year is 67.8 mm (2.7 in).

Wettest day (Rx1day) at San Francisco by year
Year	Wettest day (Rx1day)
1979	72.9 mm (2.9 in)
1980	58.9 mm (2.3 in)
1981	58.9 mm (2.3 in)
1982	63.8 mm (2.5 in)
1983	71.9 mm (2.8 in)
1984	59.9 mm (2.4 in)
1985	67.8 mm (2.7 in)
1986	49.8 mm (2.0 in)
1987	64.8 mm (2.6 in)
1988	105.9 mm (4.2 in)
1989	57.9 mm (2.3 in)
1990	105.9 mm (4.2 in)
1991	362.0 mm (14.3 in)
1992	66.8 mm (2.6 in)
1993	34.8 mm (1.4 in)
1994	74.9 mm (2.9 in)
1995	74.9 mm (2.9 in)
1996	49.8 mm (2.0 in)
1997	74.9 mm (2.9 in)
1998	49.8 mm (2.0 in)
1999	57.4 mm (2.3 in)
2000	54.9 mm (2.2 in)
2001	69.9 mm (2.8 in)
2002	95.0 mm (3.7 in)
2003	73.9 mm (2.9 in)
2004	67.8 mm (2.7 in)
2005	199.9 mm (7.9 in)
2006	63.8 mm (2.5 in)
2007	91.9 mm (3.6 in)
2008	91.9 mm (3.6 in)
2009	40.9 mm (1.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Francisco, 1979 to 2009. The record is 470.8 mm (18.5 in) in 1991, marked on the chart; the median year is 114.6 mm (4.5 in).

Wettest five days (Rx5day) at San Francisco by year
Year	Wettest five days (Rx5day)
1979	173.6 mm (6.8 in)
1980	109.4 mm (4.3 in)
1981	117.2 mm (4.6 in)
1982	137.4 mm (5.4 in)
1983	127.8 mm (5.0 in)
1984	86.1 mm (3.4 in)
1985	105.7 mm (4.2 in)
1986	86.6 mm (3.4 in)
1987	114.6 mm (4.5 in)
1988	137.7 mm (5.4 in)
1989	70.6 mm (2.8 in)
1990	154.4 mm (6.1 in)
1991	470.8 mm (18.5 in)
1992	86.6 mm (3.4 in)
1993	92.3 mm (3.6 in)
1994	106.6 mm (4.2 in)
1995	174.5 mm (6.9 in)
1996	99.6 mm (3.9 in)
1997	166.3 mm (6.5 in)
1998	144.3 mm (5.7 in)
1999	114.5 mm (4.5 in)
2000	55.7 mm (2.2 in)
2001	73.4 mm (2.9 in)
2002	225.6 mm (8.9 in)
2003	91.7 mm (3.6 in)
2004	70.6 mm (2.8 in)
2005	200.7 mm (7.9 in)
2006	135.8 mm (5.3 in)
2007	129.8 mm (5.1 in)
2008	225.3 mm (8.9 in)
2009	56.6 mm (2.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Francisco, 1979 to 2009. The record is 194 days in 1998, marked on the chart; the median year is 55 days.

Longest dry spell (CDD) at San Francisco by year
Year	Longest dry spell (CDD)
1979	44 days
1980	103 days
1981	70 days
1982	82 days
1983	72 days
1984	76 days
1985	60 days
1986	64 days
1987	33 days
1988	33 days
1989	59 days
1990	104 days
1991	49 days
1992	46 days
1993	44 days
1994	56 days
1995	68 days
1996	120 days
1997	65 days
1998	194 days
1999	80 days
2000	46 days
2001	53 days
2002	42 days
2003	41 days
2004	37 days
2005	47 days
2006	53 days
2007	32 days
2008	55 days
2009	51 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Download the Data

Data for San Francisco standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Francisco threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).