Hillsboro climate

Hillsboro Weather in September

NOAA 1991-2020 normals for Attica 2E, 19.5 km from Hillsboro

Average highs run from 82°F on September 1 to 73°F on September 30, and lows from 58°F to 47°F. Normal precipitation for the month is 2.71 in over about 7 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 Hillsboro, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
78°F
Average low
53°F
Precipitation
2.71 in
Record high
96°FSep 5, 1999
Record low
23°FSep 23, 1995
Chance of a freeze
9%
Days of 90°F or more
2.3
Daylight
13 h 03 min to 11 h 48 min
Cloud cover
48%
Humidity
71%
Dew point
55°F
Wind
8.3 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 182°F58°F92°F 199543°F 200924%0%
Sep 282°F58°F94°F 201140°F 199424%0%
Sep 382°F58°F95°F 201140°F 199424%0%
Sep 482°F58°F94°F 199939°F 199724%0%
Sep 581°F57°F96°F 199938°F 199724%0%
Sep 681°F57°F96°F 199938°F 199724%0%
Sep 781°F57°F93°F 199840°F 198824%0%
Sep 881°F56°F91°F 198534°F 198624%0%
Sep 980°F56°F94°F 198336°F 202424%0%
Sep 1080°F56°F95°F 198338°F 199924%0%
Sep 1180°F55°F95°F 201336°F 199324%0%
Sep 1280°F55°F93°F 201336°F 199324%0%
Sep 1379°F54°F96°F 199139°F 201424%0%
Sep 1479°F54°F95°F 199135°F 201324%0%
Sep 1579°F54°F93°F 199137°F 199924%0%
Sep 1678°F53°F94°F 199138°F 198424%0%
Sep 1778°F53°F89°F 202434°F 199924%0%
Sep 1878°F52°F91°F 198334°F 199524%0%
Sep 1977°F52°F91°F 198334°F 199124%0%
Sep 2077°F51°F91°F 202426°F 199124%0%
Sep 2177°F51°F91°F 201827°F 199124%0%
Sep 2276°F51°F94°F 202428°F 199924%0%
Sep 2376°F50°F92°F 201723°F 199524%0%
Sep 2475°F50°F91°F 201023°F 199524%0%
Sep 2575°F49°F90°F 201730°F 199524%0%
Sep 2675°F49°F90°F 201734°F 198924%0%
Sep 2774°F48°F90°F 199830°F 199124%0%
Sep 2874°F48°F91°F 199830°F 199124%0%
Sep 2973°F48°F89°F 199931°F 200324%0%
Sep 3073°F47°F89°F 202527°F 199324%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Hillsboro, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

September 1
sunrise 7:17 AM, sunset 8:20 PM
September 30
sunrise 7:44 AM, sunset 7:32 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00120331 (Attica 2E), public domain. Records: NOAA GHCN-Daily, station USC00121873, 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.