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Colorado · THREADEX · 1906–2026

Alamosa, CO

37.439°N, 105.862°W · station ALSthr · 121 years of record
41°F
forecast low · Sep 2

7-Day Forecast

NWS NDFD forecast low temperature for Alamosa.
41°WED9/243°THU9/344°FRI9/445°SAT9/548°SUN9/647°MON9/747°TUE9/8

This Day in History

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

Ranks

#46 / 95
coldest Sep 2 in 95 yrs of record

Coldest Sep 2 ever

30°F
set in 1956

Mildest Sep 2 ever

52°F
set in 1990
Forecast low 41°F — 46th coldest Sep 2 of 95 years · record 30°F (1956) · coldest since 2025.
1907: 40°F1932: 36°F1933: 38°F1934: 41°F1935: 42°F1936: 39°F1937: 45°F1938: 50°F1939: 41°F1940: 39°F1941: 38°F1942: 43°F1943: 35°F1944: 38°F1945: 44°F1946: 45°F1947: 42°F1948: 44°F1949: 41°F1950: 38°F1951: 37°F1952: 38°F1953: 50°F1954: 45°F1955: 37°F1956: 30°F1957: 35°F1958: 39°F1959: 30°F1960: 49°F1961: 50°F1962: 37°F1963: 37°F1964: 39°F1965: 45°F1966: 35°F1967: 40°F1968: 40°F1969: 35°F1970: 39°F1971: 42°F1972: 45°F1973: 40°F1974: 43°F1975: 45°F1976: 34°F1977: 48°F1978: 35°F1979: 36°F1980: 35°F1981: 42°F1982: 40°F1983: 46°F1984: 49°F1985: 49°F1986: 38°F1987: 42°F1988: 44°F1989: 38°F1990: 52°F1991: 43°F1992: 36°F1993: 43°F1994: 42°F1995: 48°F1996: 38°F1997: 44°F1998: 45°F1999: 48°F2000: 42°F2001: 39°F2002: 38°F2003: 46°F2004: 34°F2005: 38°F2006: 42°F2007: 49°F2008: 47°F2009: 39°F2010: 33°F2011: 48°F2012: 45°F2013: 52°F2014: 36°F2015: 43°F2016: 48°F2017: 40°F2018: 41°F2019: 40°F2020: 46°F2021: 46°F2022: 45°F2023: 44°F2024: 37°F2025: 40°F41° forecast303540455055194019501960197019801990200020102020
📖 Alamosa's full Climate Almanac →

The Numbers

Forecast low · Sep 241°F
Coldest this date since2025
This-date record30°F
This-date rank#46 of 95
Coldest at any time since2026
All-time record-50°F (1948)
Odds to tie/break0.0% (daily)
Period of record1906–2026

Record Book

The hottest and coldest ever recorded at Alamosa in each calendar month, and for the whole 1906–2026 record — with the year each was set.
MonthRecord HighRecord Low
Jan63°FJan 31, 2018-50°FJan 28, 1948
Feb67°FFeb 3, 2025-35°FFeb 13, 1948
Mar83°FMar 21, 2026-20°FMar 4, 1964
Apr80°FApr 20, 1989-6°FApr 8, 1973
May90°FMay 31, 200211°FMay 1, 1967
Jun95°FJun 26, 199423°FJun 3, 1936
Jul96°FJul 5, 198928°FJul 1, 2020
Aug93°FAug 4, 202629°FAug 21, 1964
Sep89°FSep 5, 202015°FSep 30, 1985
Oct81°FOct 7, 1979-9°FOct 31, 1991
Nov71°FNov 9, 1980-30°FNov 27, 1952
Dec63°FDec 30, 2017-42°FDec 14, 1964
All-time96°FJul 5, 1989-50°FJan 28, 1948

2026 Records So Far

Records set or tied at Alamosa so far this year — through Aug 30.

Record Highs in 2026

25 broke
plus 14 tied — daily record highs set this year
Monthly high records this year: Mar (83°F), Aug (93°F)

Record Lows in 2026

1 broke
plus 2 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

60°F
record high minimum — the night it never cooled · Jul 15, 1934

Coldest high ever

0°F
record low maximum — the day it never warmed · Dec 7, 1964
MonthWarmest lowColdest high
Jan35°FJan 31, 19632°FJan 3, 1992
Feb40°FFeb 20, 19075°FFeb 2, 2011
Mar41°FMar 28, 196318°FMar 3, 1965
Apr43°FApr 26, 194323°FApr 4, 1983
May52°FMay 9, 196334°FMay 1, 2011
Jun58°FJun 30, 202450°FJun 10, 1975
Jul60°FJul 15, 193463°FJul 21, 1961
Aug59°FAug 12, 190751°FAug 24, 1992
Sep54°FSep 21, 202240°FSep 27, 1936
Oct49°FOct 2, 201823°FOct 31, 1991
Nov39°FNov 3, 193212°FNov 28, 1976
Dec40°FDec 6, 19660°FDec 7, 1964
All-time60°FJul 15, 19340°FDec 7, 1964

Cold Streaks

Current run

0 days
consecutive days with a low ≤ 32°F

Longest ever

209 days
record run, ended Apr 24 2021

So far in 2026

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

Climate Normals

Normal low & low by month, from Alamosa's own 1991–2020 record. Today's normal low: 42°F · forecast is -2° vs normal.
Jan: 35°FJan: -1°FFeb: 41°FFeb: 7°FMar: 52°FMar: 17°FApr: 60°FApr: 25°FMay: 70°FMay: 33°FJun: 80°FJun: 41°FJul: 83°FJul: 47°FAug: 81°FAug: 46°FSep: 74°FSep: 37°FOct: 63°FOct: 24°FNov: 48°FNov: 12°FDec: 36°FDec: 0°FJFMAMJJASOND

Sun & Location

Sun & Daylight Today

Sunrise5:34 AM
Sunset6:33 PM
Solar noon12:03 PM
Daylight12h 59m · losing 16 min/wk
Local standard time (no DST), level horizon.

Location

37.44°N, 105.86°W

Nearby Stations

Pueblo, CO94 mi NEColorado Springs, CO114 mi NEClayton, NM164 mi EAlbuquerque, NM170 mi SDenver, CO178 mi NEGrand Junction, CO186 mi NW

The Last 6 Weeks

Alamosa'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.
Alamosa, CO — last six weeks of daily low

2026 So Far

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

Every Day Since 1906

Each cell is one day's low at Alamosa, coloured by temperature — 121 years of record, so heat waves read as warm streaks and cold snaps as blue.
Alamosa, CO daily low heat map 1906–2026

Days Below the Mark

How many days a year hit a given low at Alamosa — counted through Sep 2 each year, so you can see whether 2026 is running cold. Pick a threshold:
133 days ≤32°F so far in 2026 — tied for the 35th most in 121 years. Normal for this point: 104. Record: 151 in 1944.

Share Card

A ready-to-share summary of Alamosa's outlook — post it, or link this page.
Alamosa, CO cold share card
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