Sisters climate

Sisters Weather in August

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

Average highs run from 88°F on August 1 to 81°F on August 31, and lows from 44°F to 40°F. Normal precipitation for the month is 0.60 in.

August 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.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
85°F
Average low
42°F
Precipitation
0.60 in
Record high
108°FAug 7, 1972
Record low
25°FAug 28, 1960
Chance of a freeze
58%
Days of 90°F or more
9.4
Daylight
14 h 37 min to 13 h 16 min
Cloud cover
30%
Humidity
56%
Dew point
47°F
Wind
5.6 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
Aug 188°F44°F103°F 200932°F 19630%
Aug 288°F44°F105°F 202434°F 19720%
Aug 387°F44°F103°F 196135°F 19550%
Aug 487°F44°F107°F 199837°F 19500%
Aug 587°F44°F106°F 199833°F 19690%
Aug 687°F44°F106°F 197234°F 19800%
Aug 787°F44°F108°F 197232°F 19980%
Aug 887°F44°F104°F 197236°F 19490%
Aug 986°F44°F103°F 201837°F 19700%
Aug 1086°F43°F102°F 197137°F 19910%
Aug 1186°F43°F102°F 202136°F 19910%
Aug 1286°F43°F101°F 202135°F 19510%
Aug 1385°F43°F102°F 199832°F 19490%
Aug 1485°F43°F102°F 202336°F 19640%
Aug 1585°F43°F105°F 202336°F 19600%
Aug 1685°F43°F106°F 200835°F 19540%
Aug 1784°F42°F103°F 196734°F 19980%
Aug 1884°F42°F103°F 196731°F 19730%
Aug 1984°F42°F105°F 196731°F 19640%
Aug 2084°F42°F100°F 200934°F 19480%
Aug 2183°F42°F96°F 196134°F 19850%
Aug 2283°F42°F98°F 196131°F 19600%
Aug 2383°F42°F99°F 196932°F 19710%
Aug 2483°F41°F97°F 195831°F 19920%
Aug 2582°F41°F100°F 201031°F 19920%
Aug 2682°F41°F95°F 197132°F 19930%
Aug 2782°F41°F98°F 197233°F 19600%
Aug 2882°F41°F101°F 199825°F 19600%
Aug 2981°F40°F100°F 199831°F 19640%
Aug 3081°F40°F101°F 196731°F 19650%
Aug 3181°F40°F100°F 196728°F 20060%

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).

August 1
sunrise 5:54 AM, sunset 8:31 PM
August 31
sunrise 6:28 AM, sunset 7:44 PM

Every day of August: 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.