California · THREADEX · 1945–2026
San Francisco Airport, CA
37.620°N, 122.366°W · station SFOthr · 82 years of record
55°F
forecast low · Jul 17
7-Day Forecast
NWS NDFD forecast low temperature for San Francisco Airport.
This Day in History · Jul 17
Today ranks
#39 / 81
coldest Jul 17 in 81 yrs of record
Coldest Jul 17 ever
47°F
set in 1954
Mildest Jul 17 ever
63°F
set in 2014
Coldest Jul 17 — Year by Year
Every year's low on Jul 17 at San Francisco Airport. The forecast line shows where today lands; the ringed bar is the coldest on record.
The Numbers
| Forecast low · Jul 17 | 55°F |
| Coldest this date since | 2021 |
| This-date record | 47°F |
| This-date rank | #39 of 81 |
| Coldest at any time since | 2026 |
| All-time record | 24°F (1972) |
| Odds to tie/break | 0.0% (daily) |
| Period of record | 1945–2026 |
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.
| Month | Record High | Record Low |
|---|---|---|
| Jan | 74°F2015 | 26°F1949 |
| Feb | 78°F2022 | 30°F1949 |
| Mar | 89°F2026 | 31°F1966 |
| Apr | 92°F1981 | 36°F1955 |
| May | 97°F1984 | 39°F1950 |
| Jun | 105°F2000 | 43°F1954 |
| Jul | 99°F1985 | 44°F1951 |
| Aug | 99°F2010 | 45°F1952 |
| Sep | 104°F2017 | 41°F1950 |
| Oct | 99°F1987 | 37°F1949 |
| Nov | 85°F1967 | 31°F1954 |
| Dec | 75°F1958 | 24°F1972 |
| All-time | 105°F2000 | 24°F1972 |
2026 Records So Far
Records set or tied at San Francisco Airport so far this year — through Jul 11.
Record Highs in 2026
10 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
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: 56°F · forecast is -1° vs normal.
Sun & Location
Sun & Daylight Today
| Sunrise | 4:58 AM |
| Sunset | 7:32 PM |
| Solar noon | 12:15 PM |
| Daylight | 14h 33m · losing 7 min/wk |
Local standard time (no DST), level horizon.
Location
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.
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.
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.
Days Below the Mark
How many days a year hit a given low at San Francisco Airport — counted through Jul 17 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.
Coldest Since · Browse all states · See where it's hottest → hottestsince.com
part of Weather Trader · supported by Substack Subscribers · data: NWS NDFD forecast + NOAA/ACIS ThreadEx records · updated 2026-07-13T14:03:07Z
© 2026 Weather Trader · All rights reserved
part of Weather Trader · supported by Substack Subscribers · data: NWS NDFD forecast + NOAA/ACIS ThreadEx records · updated 2026-07-13T14:03:07Z
© 2026 Weather Trader · All rights reserved