33.953°N, 117.435°W · station RALthr · 134 years of record
92°F
HOTTEST SEP 7 SINCE 2025
forecast high · Sep 7
7-Day Forecast
NWS NDFD forecast high temperature for Riverside.
This Day in History
Every year's high on each of the next 7 forecast dates at Riverside — toggle a day below. The forecast line shows where it lands; the ringed bar is the hottest on record.
Ranks
#92 / 126
warmest Sep 1 in 126 yrs of record
Warmest Sep 1 ever
112°F
set in 2017
Coolest Sep 1 ever
78°F
set in 1964
Forecast high 89°F — 92nd warmest Sep 1 of 126 years · record 112°F (2017) · warmest since 2025.
Ranks
#94 / 124
warmest Sep 2 in 124 yrs of record
Warmest Sep 2 ever
111°F
set in 1982
Coolest Sep 2 ever
80°F
set in 2000
Forecast high 88°F — 94th warmest Sep 2 of 124 years · record 111°F (1982) · warmest since 2025.
Ranks
#104 / 124
warmest Sep 3 in 124 yrs of record
Warmest Sep 3 ever
112°F
set in 1955
Coolest Sep 3 ever
80°F
set in 1909
Forecast high 87°F — 104th warmest Sep 3 of 124 years · record 112°F (1955) · warmest since 2025.
Ranks
#86 / 123
warmest Sep 4 in 123 yrs of record
Warmest Sep 4 ever
111°F
set in 1988
Coolest Sep 4 ever
74°F
set in 1985
Forecast high 89°F — 86th warmest Sep 4 of 123 years · record 111°F (1988) · warmest since 2025.
Ranks
#94 / 124
warmest Sep 5 in 124 yrs of record
Warmest Sep 5 ever
112°F
set in 1955
Coolest Sep 5 ever
72°F
set in 1985
Forecast high 88°F — 94th warmest Sep 5 of 124 years · record 112°F (1955) · warmest since 2025.
Ranks
#87 / 127
warmest Sep 6 in 127 yrs of record
Warmest Sep 6 ever
117°F
set in 2020
Coolest Sep 6 ever
71°F
set in 1965
Forecast high 91°F — 87th warmest Sep 6 of 127 years · record 117°F (2020) · warmest since 2025.
Ranks
#76 / 126
warmest Sep 7 in 126 yrs of record
Warmest Sep 7 ever
117°F
set in 2020
Coolest Sep 7 ever
72°F
set in 1929
Forecast high 92°F — 76th warmest Sep 7 of 126 years · record 117°F (2020) · warmest since 2025.
The hottest and coldest ever recorded at Riverside in each calendar month, and for the whole 1893–2026 record — with the year each was set.
Month
Record High
Record Low
Jan
94°FJan 8, 1923
19°FJan 7, 1950
Feb
94°FFeb 25, 1921
24°FFeb 16, 1903
Mar
102°FMar 10, 1916
25°FMar 2, 1903
Apr
105°FApr 6, 1989
29°FApr 4, 1970
May
110°FMay 29, 1984
33°FMay 1, 1915
Jun
118°FJun 16, 1917
35°FJun 11, 1894
Jul
118°FJul 17, 1925
41°FJul 7, 1948
Aug
113°FAug 24, 1926
40°FAug 27, 1902
Sep
117°FSep 5, 2020
37°FSep 15, 1902
Oct
109°FOct 1, 1980
30°FOct 30, 1971
Nov
100°FNov 3, 2010
23°FNov 11, 1950
Dec
94°FDec 3, 1958
21°FDec 26, 1911
All-time
118°FJun 16, 1917
19°FJan 7, 1950
2026 Records So Far
Records set or tied at Riverside so far this year — through Aug 30.
Record Highs in 2026
9 broke
plus 1 tied — daily record highs set this year
Monthly high record this year: Mar (102°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
80°F
record high minimum — the night it never cooled · Sep 21, 1939
Coldest high ever
37°F
record low maximum — the day it never warmed · Dec 13, 1932
Month
Warmest low
Coldest high
Jan
65°FJan 7, 2003
41°FJan 6, 1913
Feb
72°FFeb 15, 2016
45°FFeb 1, 1923
Mar
66°FMar 13, 2015
46°FMar 4, 1945
Apr
63°FApr 2, 1960
52°FApr 4, 1965
May
74°FMay 18, 2008
52°FMay 28, 1953
Jun
74°FJun 26, 2006
61°FJun 3, 1925
Jul
80°FJul 22, 2006
72°FJul 2, 1902
Aug
79°FAug 17, 2012
69°FAug 29, 1951
Sep
80°FSep 21, 1939
62°FSep 24, 1934
Oct
74°FOct 1, 2008
53°FOct 22, 1941
Nov
71°FNov 3, 1950
44°FNov 26, 1906
Dec
67°FDec 16, 1998
37°FDec 13, 1932
All-time
80°FSep 21, 1939
37°FDec 13, 1932
Hot Streaks
Current run
16 days
consecutive days with a high ≥ 90°F
Longest ever
66 days
record run, ended Aug 17 1981
So far in 2026
85 days
days with a high ≥ 90°F this year
Climate Normals
Normal high & low by month, from Riverside's own 1991–2020 record. Today's normal high: 94°F · forecast is -2° vs normal.
Riverside's observed daily high 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 Riverside's own record — the record high, the normal, and the full span ever seen. A shareable look at where the year stands.