Oswego climate

Oswego Weather in August

NOAA 1991-2020 normals for Aurora, 11.4 km from Oswego

Average highs run from 83°F on August 1 to 80°F on August 31, and lows from 65°F to 61°F. Normal precipitation for the month is 3.86 in over about 9 wet days.

August day by day

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

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

August at a glance

Average high
82°F
Average low
63°F
Precipitation
3.86 in
Record high
97°FAug 2, 2006
Record low
40°FAug 31, 2009
Chance of a freeze
0%
Days of 90°F or more
3.3
Daylight
14 h 23 min to 13 h 10 min
Cloud cover
50%
Humidity
74%
Dew point
63°F
Wind
7.4 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 183°F65°F96°F 200650°F 201930%0%
Aug 283°F65°F97°F 200648°F 200930%0%
Aug 383°F64°F94°F 201252°F 199930%0%
Aug 483°F64°F93°F 201249°F 202030%0%
Aug 583°F64°F92°F 201845°F 202030%0%
Aug 683°F64°F92°F 202247°F 200430%0%
Aug 783°F64°F94°F 200148°F 200430%0%
Aug 883°F64°F91°F 200548°F 201730%0%
Aug 983°F64°F95°F 200547°F 199930%0%
Aug 1083°F64°F91°F 201648°F 202430%0%
Aug 1183°F64°F93°F 201645°F 200430%0%
Aug 1283°F64°F91°F 201045°F 200430%0%
Aug 1383°F64°F90°F 201044°F 200430%0%
Aug 1482°F64°F90°F 202044°F 200130%0%
Aug 1582°F64°F92°F 202541°F 200430%0%
Aug 1682°F63°F94°F 202545°F 200430%0%
Aug 1782°F63°F88°F 202548°F 201230%0%
Aug 1882°F63°F90°F 202547°F 201230%0%
Aug 1982°F63°F89°F 202150°F 202030%0%
Aug 2082°F63°F92°F 201049°F 200130%0%
Aug 2182°F63°F95°F 200346°F 200430%0%
Aug 2282°F63°F89°F 200745°F 200430%0%
Aug 2382°F62°F94°F 202349°F 201829%0%
Aug 2481°F62°F96°F 202349°F 200529%0%
Aug 2581°F62°F94°F 200343°F 201729%0%
Aug 2681°F62°F93°F 200344°F 202529%0%
Aug 2781°F62°F96°F 202446°F 201529%0%
Aug 2881°F61°F94°F 200348°F 202329%0%
Aug 2981°F61°F93°F 201048°F 200129%0%
Aug 3081°F61°F93°F 201343°F 200929%0%
Aug 3180°F61°F93°F 200040°F 200929%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Oswego, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

August 1
sunrise 5:48 AM, sunset 8:11 PM
August 31
sunrise 6:18 AM, sunset 7:28 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00110338 (Aurora), public domain. Records: NOAA GHCN-Daily, station USW00004808, 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.