Nez Perce County climate

Nez Perce County Weather in September

NOAA 1991-2020 normals for Winchester, 13.9 km from Nez Perce County

Average highs run from 75°F on September 1 to 64°F on September 30, and lows from 46°F to 39°F. Normal precipitation for the month is 1.05 in over about 6 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 Nez Perce County, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
70°F
Average low
42°F
Precipitation
1.05 in
Record high
103°FSep 2, 1950
Record low
28°FSep 17, 1965
Chance of a freeze
66%
Daylight
13 h 17 min to 11 h 45 min
Cloud cover
44%
Humidity
55%
Dew point
41°F
Wind
4.7 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 175°F46°F102°F 202544°F 199918%0%
Sep 275°F46°F103°F 195043°F 199919%0%
Sep 375°F45°F102°F 199839°F 195619%0%
Sep 474°F45°F101°F 202039°F 195619%0%
Sep 574°F45°F101°F 197340°F 195619%0%
Sep 674°F45°F100°F 200342°F 201519%0%
Sep 773°F44°F100°F 202438°F 196019%0%
Sep 873°F44°F99°F 198137°F 196219%0%
Sep 973°F44°F96°F 202440°F 195919%0%
Sep 1072°F44°F97°F 199042°F 197220%0%
Sep 1172°F44°F99°F 195341°F 194920%0%
Sep 1271°F43°F97°F 201136°F 197020%0%
Sep 1371°F43°F96°F 201333°F 197020%0%
Sep 1471°F43°F99°F 201332°F 197020%0%
Sep 1570°F43°F98°F 197935°F 197021%
Sep 1670°F42°F97°F 198135°F 196521%
Sep 1770°F42°F99°F 198128°F 196521%
Sep 1869°F42°F97°F 198135°F 196521%
Sep 1969°F42°F96°F 200832°F 195722%
Sep 2068°F41°F92°F 197934°F 198322%
Sep 2168°F41°F101°F 196737°F 198322%
Sep 2267°F41°F99°F 196634°F 195522%
Sep 2367°F41°F97°F 200131°F 200023%
Sep 2466°F40°F100°F 201134°F 194823%
Sep 2566°F40°F94°F 202434°F 195523%
Sep 2666°F40°F92°F 195237°F 195524%
Sep 2765°F39°F93°F 196336°F 196124%
Sep 2865°F39°F95°F 196333°F 198525%
Sep 2964°F39°F88°F 196331°F 195025%
Sep 3064°F39°F89°F 197630°F 195426%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Nez Perce County, 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 (PDT).

September 1
sunrise 6:08 AM, sunset 7:25 PM
September 30
sunrise 6:44 AM, sunset 6:29 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00109846 (Winchester), public domain. Records: NOAA GHCN-Daily, station USW00024149, 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.