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California · THREADEX · 1945–2026

San Francisco Airport, CA

37.620°N, 122.366°W · station SFOthr · 82 years of record
57°F
forecast low · Sep 2

7-Day Forecast

NWS NDFD forecast low temperature for San Francisco Airport.
57°WED9/258°THU9/357°FRI9/457°SAT9/557°SUN9/658°MON9/759°TUE9/8

This Day in History

Every year's low on each of the next 7 forecast dates at San Francisco Airport — toggle a day below. The forecast line shows where it lands; the ringed bar is the coldest on record.

Ranks

#57 / 81
coldest Sep 2 in 81 yrs of record

Coldest Sep 2 ever

49°F
set in 1946

Mildest Sep 2 ever

72°F
set in 2017
Forecast low 57°F — 57th coldest Sep 2 of 81 years · record 49°F (1946) · coldest since 2022.
1945: 52°F1946: 49°F1947: 56°F1948: 50°F1949: 51°F1950: 56°F1951: 52°F1952: 56°F1953: 52°F1954: 55°F1955: 55°F1956: 53°F1957: 51°F1958: 55°F1959: 54°F1960: 52°F1961: 53°F1962: 51°F1963: 55°F1964: 56°F1965: 55°F1966: 51°F1967: 56°F1968: 60°F1969: 52°F1970: 54°F1971: 58°F1972: 53°F1973: 53°F1974: 52°F1975: 52°F1976: 53°F1977: 54°F1978: 56°F1979: 63°F1980: 53°F1981: 51°F1982: 53°F1983: 56°F1984: 56°F1985: 55°F1986: 55°F1987: 57°F1988: 54°F1989: 51°F1990: 55°F1991: 55°F1992: 59°F1993: 58°F1994: 55°F1995: 53°F1996: 52°F1997: 62°F1998: 54°F1999: 54°F2000: 59°F2001: 54°F2002: 60°F2003: 56°F2004: 59°F2005: 57°F2006: 55°F2007: 59°F2008: 55°F2009: 61°F2010: 59°F2011: 55°F2012: 53°F2013: 62°F2014: 60°F2015: 62°F2016: 58°F2017: 72°F2018: 53°F2019: 62°F2020: 58°F2021: 57°F2022: 55°F2023: 63°F2024: 57°F2025: 59°F57° forecast4550556065707519501960197019801990200020102020
📖 San Francisco Airport's full Climate Almanac →

The Numbers

Forecast low · Sep 257°F
Coldest this date since2022
This-date record49°F
This-date rank#57 of 81
Coldest at any time since2026
All-time record24°F (1972)
Odds to tie/break0.0% (daily)
Period of record1945–2026

Record Book

The hottest and coldest ever recorded at San Francisco Airport in each calendar month, and for the whole 1945–2026 record — with the year each was set.
MonthRecord HighRecord Low
Jan74°FJan 31, 201526°FJan 5, 1949
Feb78°FFeb 10, 202230°FFeb 14, 1949
Mar89°FMar 20, 202631°FMar 3, 1966
Apr92°FApr 29, 198136°FApr 27, 1955
May97°FMay 27, 198439°FMay 3, 1950
Jun105°FJun 14, 200043°FJun 1, 1954
Jul99°FJul 1, 198544°FJul 29, 1951
Aug99°FAug 24, 201045°FAug 30, 1952
Sep104°FSep 1, 201741°FSep 30, 1950
Oct99°FOct 5, 198737°FOct 20, 1949
Nov85°FNov 1, 196731°FNov 30, 1954
Dec75°FDec 2, 195824°FDec 9, 1972
All-time105°FJun 14, 200024°FDec 9, 1972

2026 Records So Far

Records set or tied at San Francisco Airport so far this year — through Aug 30.

Record Highs in 2026

11 broke
plus 1 tied — daily record highs set this year
Monthly high record this year: Mar (89°F)

Record Lows in 2026

0 broke
plus 0 tied — daily record lows set this year

Record Warm Nights & Cold Days

Two more daily records, kept separate from the rankings: the warmest a night has ever stayed (record high minimum) and the coldest a day has ever gotten (record low maximum) — the flip side of the usual record high and low.

Warmest low ever

72°F
record high minimum — the night it never cooled · Sep 2, 2017

Coldest high ever

37°F
record low maximum — the day it never warmed · Dec 9, 1972
MonthWarmest lowColdest high
Jan62°FJan 1, 199739°FJan 10, 1949
Feb59°FFeb 7, 201541°FFeb 5, 1976
Mar60°FMar 4, 201645°FMar 2, 1976
Apr62°FApr 21, 200949°FApr 28, 1948
May66°FMay 17, 199752°FMay 8, 1963
Jun67°FJun 14, 200056°FJun 2, 1967
Jul65°FJul 21, 201456°FJul 3, 1949
Aug66°FAug 15, 202059°FAug 12, 1945
Sep72°FSep 2, 201759°FSep 16, 1989
Oct68°FOct 6, 202454°FOct 18, 1949
Nov63°FNov 20, 195049°FNov 9, 1982
Dec59°FDec 22, 196437°FDec 9, 1972
All-time72°FSep 2, 201737°FDec 9, 1972

Cold Streaks

Current run

0 days
consecutive days with a low ≤ 32°F

Longest ever

8 days
record run, ended Dec 15 1972

So far in 2026

0 days
days with a low ≤ 32°F this year

Climate Normals

Normal low & low by month, from San Francisco Airport's own 1991–2020 record. Today's normal low: 57°F · forecast is +0° vs normal.
Jan: 57°FJan: 45°FFeb: 60°FFeb: 47°FMar: 63°FMar: 48°FApr: 65°FApr: 50°FMay: 67°FMay: 52°FJun: 71°FJun: 54°FJul: 72°FJul: 56°FAug: 73°FAug: 57°FSep: 74°FSep: 56°FOct: 71°FOct: 54°FNov: 63°FNov: 49°FDec: 57°FDec: 45°FJFMAMJJASOND

Sun & Location

Sun & Daylight Today

Sunrise5:39 AM
Sunset6:39 PM
Solar noon12:09 PM
Daylight12h 59m · losing 16 min/wk
Local standard time (no DST), level horizon.

Location

37.62°N, 122.37°W

Nearby Stations

San Jose, CA30 mi SEStockton, CA65 mi ESacramento, CA77 mi NEMerced, CA103 mi EUkiah, CA113 mi NWMadera, CA131 mi E

The Last 6 Weeks

San Francisco Airport's observed daily low for the last six weeks — a white ring marks any day that broke or tied its daily record for that date.
San Francisco Airport, CA — last six weeks of daily low

2026 So Far

Every day this year against San Francisco Airport's own record — the record low, the normal, and the full span ever seen. A shareable look at where the year stands.
San Francisco Airport, CA — 2026 daily low trace
Download year chart

Every Day Since 1945

Each cell is one day's low at San Francisco Airport, coloured by temperature — 82 years of record, so heat waves read as warm streaks and cold snaps as blue.
San Francisco Airport, CA daily low heat map 1945–2026

Days Below the Mark

How many days a year hit a given low at San Francisco Airport — counted through Sep 2 each year, so you can see whether 2026 is running cold. Pick a threshold:
No days ≤32°F yet in 2026. Normal for this point: 1. Record: 14 in 1949.

Share Card

A ready-to-share summary of San Francisco Airport's outlook — post it, or link this page.
San Francisco Airport, CA cold share card
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