Sisters climate

Sisters Weather in September

NOAA 1991-2020 normals for Sisters, 0.8 km from Sisters

Average highs run from 81°F on September 1 to 70°F on September 30, and lows from 40°F to 32°F. Normal precipitation for the month is 0.54 in.

September day by day

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

Normal daily high and low temperature at Sisters, in °F, with the record for each date.020406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
76°F
Average low
36°F
Precipitation
0.54 in
Record high
106°FSep 2, 2022
Record low
16°FSep 24, 1961
Chance of a freeze
99%
Days of 90°F or more
2.2
Daylight
13 h 13 min to 11 h 45 min
Cloud cover
39%
Humidity
59%
Dew point
42°F
Wind
5.8 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 181°F40°F104°F 199828°F 19730%
Sep 280°F40°F106°F 202228°F 19730%
Sep 380°F39°F101°F 200330°F 19640%
Sep 480°F39°F101°F 199831°F 19690%
Sep 580°F39°F99°F 199829°F 20100%
Sep 679°F39°F98°F 199826°F 20100%
Sep 779°F38°F96°F 199826°F 19600%
Sep 879°F38°F97°F 198128°F 20020%
Sep 978°F38°F94°F 201126°F 19620%
Sep 1078°F38°F98°F 195328°F 19720%
Sep 1178°F37°F95°F 201128°F 20120%
Sep 1277°F37°F94°F 200224°F 20120%
Sep 1377°F37°F96°F 200224°F 19700%
Sep 1477°F37°F96°F 197922°F 19700%
Sep 1576°F36°F97°F 197923°F 19700%
Sep 1676°F36°F97°F 200825°F 20060%
Sep 1776°F36°F95°F 198119°F 19650%
Sep 1875°F35°F92°F 198422°F 19650%
Sep 1975°F35°F95°F 199924°F 19830%
Sep 2074°F35°F95°F 199923°F 19830%
Sep 2174°F35°F96°F 196723°F 19550%
Sep 2274°F34°F92°F 199219°F 19610%
Sep 2373°F34°F97°F 200918°F 20000%
Sep 2473°F34°F95°F 202416°F 19610%
Sep 2572°F33°F95°F 195219°F 20000%
Sep 2672°F33°F95°F 196324°F 19700%
Sep 2771°F33°F97°F 196325°F 19990%
Sep 2871°F32°F93°F 196722°F 19990%
Sep 2970°F32°F91°F 200620°F 19830%
Sep 3070°F32°F91°F 201123°F 19540%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Sisters, in percent, and of at least 0.1 inch of snowfall.00.21102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

September 1
sunrise 6:29 AM, sunset 7:42 PM
September 30
sunrise 7:03 AM, sunset 6:48 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00357857 (Sisters), public domain. Records: NOAA GHCN-Daily, station USW00024230, 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.