Riverside climate

Riverside Weather in September

NOAA 1991-2020 normals for Sunbury, 17.6 km from Riverside

Average highs run from 80°F on September 1 to 70°F on September 30, and lows from 56°F to 46°F. Normal precipitation for the month is 4.52 in over about 9 wet days.

September day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Riverside, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
75°F
Average low
51°F
Precipitation
4.52 in
Record high
96°FSep 25, 2017
Record low
29°FSep 2, 2017
Chance of a freeze
11%
Days of 90°F or more
1.6
Daylight
13 h 06 min to 11 h 48 min
Cloud cover
59%
Humidity
73%
Dew point
53°F
Wind
3.8 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Sep 180°F56°F90°F 201043°F 200931%0%
Sep 279°F56°F91°F 201029°F 201731%0%
Sep 379°F56°F90°F 200829°F 201731%0%
Sep 479°F55°F90°F 200844°F 202430%0%
Sep 579°F55°F90°F 201842°F 201330%0%
Sep 678°F55°F89°F 201844°F 201030%0%
Sep 778°F54°F90°F 201542°F 201330%0%
Sep 878°F54°F90°F 201545°F 202430%0%
Sep 977°F54°F89°F 201541°F 201330%0%
Sep 1077°F53°F89°F 201643°F 201731%0%
Sep 1177°F53°F88°F 201942°F 201231%0%
Sep 1276°F53°F84°F 202445°F 201731%0%
Sep 1376°F52°F83°F 201646°F 201431%0%
Sep 1476°F52°F87°F 200842°F 201331%0%
Sep 1576°F52°F86°F 202139°F 202031%0%
Sep 1675°F51°F82°F 201540°F 201331%0%
Sep 1775°F51°F82°F 201537°F 201331%0%
Sep 1874°F50°F85°F 202140°F 201331%0%
Sep 1974°F50°F83°F 202432°F 202031%0%
Sep 2074°F50°F85°F 202434°F 202031%0%
Sep 2173°F49°F83°F 201733°F 202031%0%
Sep 2273°F49°F87°F 201032°F 202031%0%
Sep 2373°F49°F85°F 201639°F 201332%0%
Sep 2472°F48°F93°F 201737°F 201332%0%
Sep 2572°F48°F96°F 201740°F 201332%0%
Sep 2672°F47°F88°F 201742°F 201332%0%
Sep 2771°F47°F87°F 201747°F 201433%0%
Sep 2871°F47°F83°F 201944°F 202333%0%
Sep 2970°F46°F76°F 201942°F 201733%0%
Sep 3070°F46°F74°F 201040°F 202233%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Riverside, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

September 1
sunrise 6:33 AM, sunset 7:39 PM
September 30
sunrise 7:02 AM, sunset 6:50 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00368668 (Sunbury), public domain. Records: NOAA GHCN-Daily, station USC00360457, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.