37.439°N, 105.862°W · station ALSthr · 121 years of record
41°F
COLDEST SEP 2 SINCE 2025
forecast low · Sep 2
7-Day Forecast
NWS NDFD forecast low temperature for Alamosa.
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.
Ranks
#60 / 95
coldest Sep 3 in 95 yrs of record
Coldest Sep 3 ever
25°F
set in 1973
Mildest Sep 3 ever
51°F
set in 1937
Forecast low 43°F — 60th coldest Sep 3 of 95 years · record 25°F (1973) · coldest since 2025.
Ranks
#74 / 95
coldest Sep 4 in 95 yrs of record
Coldest Sep 4 ever
29°F
set in 1944
Mildest Sep 4 ever
51°F
set in 1936
Forecast low 44°F — 74th coldest Sep 4 of 95 years · record 29°F (1944) · coldest since 2025.
Ranks
#74 / 95
coldest Sep 5 in 95 yrs of record
Coldest Sep 5 ever
27°F
set in 1971
Mildest Sep 5 ever
51°F
set in 2014
Forecast low 45°F — 74th coldest Sep 5 of 95 years · record 27°F (1971) · coldest since 2025.
Ranks
#90 / 95
coldest Sep 6 in 95 yrs of record
Coldest Sep 6 ever
28°F
set in 1943
Mildest Sep 6 ever
50°F
set in 1937
Forecast low 48°F — 90th coldest Sep 6 of 95 years · record 28°F (1943) · coldest since 2025.
Ranks
#83 / 95
coldest Sep 7 in 95 yrs of record
Coldest Sep 7 ever
28°F
set in 1970
Mildest Sep 7 ever
52°F
set in 1995
Forecast low 47°F — 83rd coldest Sep 7 of 95 years · record 28°F (1970) · coldest since 2025.
Ranks
#75 / 95
coldest Sep 8 in 95 yrs of record
Coldest Sep 8 ever
29°F
set in 2001
Mildest Sep 8 ever
53°F
set in 1954
Forecast low 47°F — 75th coldest Sep 8 of 95 years · record 29°F (2001) · coldest since 2025.
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.
Month
Record High
Record Low
Jan
63°FJan 31, 2018
-50°FJan 28, 1948
Feb
67°FFeb 3, 2025
-35°FFeb 13, 1948
Mar
83°FMar 21, 2026
-20°FMar 4, 1964
Apr
80°FApr 20, 1989
-6°FApr 8, 1973
May
90°FMay 31, 2002
11°FMay 1, 1967
Jun
95°FJun 26, 1994
23°FJun 3, 1936
Jul
96°FJul 5, 1989
28°FJul 1, 2020
Aug
93°FAug 4, 2026
29°FAug 21, 1964
Sep
89°FSep 5, 2020
15°FSep 30, 1985
Oct
81°FOct 7, 1979
-9°FOct 31, 1991
Nov
71°FNov 9, 1980
-30°FNov 27, 1952
Dec
63°FDec 30, 2017
-42°FDec 14, 1964
All-time
96°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
Month
Warmest low
Coldest high
Jan
35°FJan 31, 1963
2°FJan 3, 1992
Feb
40°FFeb 20, 1907
5°FFeb 2, 2011
Mar
41°FMar 28, 1963
18°FMar 3, 1965
Apr
43°FApr 26, 1943
23°FApr 4, 1983
May
52°FMay 9, 1963
34°FMay 1, 2011
Jun
58°FJun 30, 2024
50°FJun 10, 1975
Jul
60°FJul 15, 1934
63°FJul 21, 1961
Aug
59°FAug 12, 1907
51°FAug 24, 1992
Sep
54°FSep 21, 2022
40°FSep 27, 1936
Oct
49°FOct 2, 2018
23°FOct 31, 1991
Nov
39°FNov 3, 1932
12°FNov 28, 1976
Dec
40°FDec 6, 1966
0°FDec 7, 1964
All-time
60°FJul 15, 1934
0°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.