Riverside CA Recent September Temperatures, Rainfall

The numbers here describe what the September weather in Riverside, California was like for every year since 2010. A series of tables gives September data by year for temperature and precipitation.

They begin with average maximum and minimum temperatures in degrees Fahrenheit and Celsius. That's followed by how many really hot days occurred each September. Then there's information on how much rain actually landed this month during recent years, as well as how often Riverside had wet weather.

The climate data come from weather measurements made at the Riverside Municipal Airport.

Temperature

September temperature averages by year in Riverside
High °F	Low °F	Year	High °C	Low °C
85	62	2023	29	17
95	68	2022	35	20
91	63	2021	33	17
97	64	2020	36	18
92	63	2019	33	17
92	62	2018	33	17
89	63	2017	32	17
91	62	2016	33	17
94	67	2015	34	20
94	66	2014	34	19
92	64	2013	33	18
96	66	2012	36	19
91	62	2011	33	17
93	60	2010	34	16

Number of days in September when the temperature in Riverside rose to at least 70 or 90 degrees Fahrenheit
Year	70 °F 21 °C	90 °F 32 °C
2023	30	9
2022	30	18
2021	30	18
2020	30	28
2019	30	17
2018	30	22
2017	30	15
2016	30	17
2015	30	20
2014	30	20
2013	30	19
2012	30	27
2011	30	20
2010	30	20

Rain

This table gives the total precipitation that fell on Riverside during September in each year from 2010. The number of days with precipitation counts the days when rainfall amounted to 0.01 inches (0.3 millimeters) or more.

Total rainfall for September in Riverside
Days	Year	Inches	Millimetres
2	2023	0.3	8
2	2022	0.1	4
0	2021	0.0	0
0	2020	0.0	0
1	2019	0.0	0
0	2018	0.0	0
1	2017	0.2	6
0	2016	0.0	0
2	2015	1.9	47
2	2014	0.2	6
0	2013	0.0	0
0	2012	0.0	0
1	2011	0.0	1
1	2010	0.0	0

Riverside - Recent September Temperatures and Rainfall

Temperature

Rain

Reference

More on Weather in Riverside