Grand Ronde climate

Grand Ronde Weather in September

NOAA 1991-2020 normals for Laurel Mtn, 15.5 km from Grand Ronde

Average highs run from 70°F on September 1 to 63°F on September 30, and lows from 50°F to 45°F. Normal precipitation for the month is 3.99 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 Grand Ronde, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
67°F
Average low
48°F
Precipitation
3.99 in
Record high
101°FSep 2, 2017
Record low
32°FSep 27, 1999
Chance of a freeze
3%
Daylight
13 h 14 min to 11 h 44 min
Cloud cover
49%
Humidity
86%
Dew point
53°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 170°F50°F97°F 199835°F 200816%0%
Sep 270°F49°F101°F 201741°F 200816%0%
Sep 369°F49°F99°F 202040°F 200817%0%
Sep 469°F49°F95°F 200340°F 201817%0%
Sep 569°F49°F99°F 202441°F 200017%0%
Sep 669°F49°F97°F 201439°F 200118%0%
Sep 769°F49°F96°F 201238°F 199918%0%
Sep 869°F49°F92°F 201138°F 202219%0%
Sep 969°F49°F95°F 201141°F 199819%0%
Sep 1068°F49°F96°F 200738°F 200819%0%
Sep 1168°F49°F97°F 201737°F 201220%0%
Sep 1268°F48°F92°F 199942°F 201620%0%
Sep 1368°F48°F94°F 199942°F 200820%0%
Sep 1468°F48°F91°F 200841°F 201621%0%
Sep 1567°F48°F94°F 202336°F 200321%0%
Sep 1667°F48°F92°F 202536°F 202122%0%
Sep 1767°F48°F91°F 201241°F 201822%0%
Sep 1867°F48°F93°F 199938°F 201822%0%
Sep 1966°F47°F93°F 199939°F 201823%0%
Sep 2066°F47°F95°F 201440°F 200423%0%
Sep 2166°F47°F88°F 199939°F 201623%0%
Sep 2265°F47°F93°F 200938°F 200524%0%
Sep 2365°F47°F90°F 200237°F 200724%0%
Sep 2465°F46°F91°F 202136°F 200525%0%
Sep 2565°F46°F89°F 202237°F 200025%0%
Sep 2664°F46°F92°F 200337°F 200026%0%
Sep 2764°F46°F98°F 200332°F 199926%0%
Sep 2863°F46°F87°F 200638°F 200127%0%
Sep 2963°F45°F92°F 200838°F 202428%0%
Sep 3063°F45°F87°F 200137°F 201628%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Grand Ronde, 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 6:37 AM, sunset 7:51 PM
September 30
sunrise 7:12 AM, sunset 6:56 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00354776 (Laurel Mtn), public domain. Records: NOAA GHCN-Daily, station USW00094273, 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.