Sister Bay climate

Sister Bay Weather in September

NOAA 1991-2020 normals for Ephraim 1NE-Wwtp, 3.1 km from Sister Bay

Average highs run from 75°F on September 1 to 65°F on September 30, and lows from 55°F to 47°F. Normal precipitation for the month is 3.41 in over about 9 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 Sister Bay, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
70°F
Average low
51°F
Precipitation
3.41 in
Record high
90°FSep 4, 2023
Record low
32°FSep 19, 2020
Chance of a freeze
9%
Daylight
13 h 16 min to 11 h 46 min
Cloud cover
63%
Humidity
80%
Dew point
56°F
Wind
14.1 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°F55°F85°F 201041°F 200931%0%
Sep 275°F55°F87°F 200843°F 201732%0%
Sep 375°F55°F87°F 200847°F 202132%0%
Sep 474°F54°F90°F 202347°F 202532%0%
Sep 574°F54°F87°F 202339°F 202232%0%
Sep 674°F54°F80°F 201638°F 201132%0%
Sep 773°F54°F86°F 201539°F 201132%0%
Sep 873°F54°F83°F 201343°F 202532%0%
Sep 973°F53°F81°F 201141°F 201732%0%
Sep 1072°F53°F82°F 201342°F 201032%0%
Sep 1172°F53°F86°F 201338°F 202032%0%
Sep 1272°F53°F84°F 201139°F 202032%0%
Sep 1371°F52°F85°F 201138°F 201532%0%
Sep 1471°F52°F82°F 200938°F 201332%0%
Sep 1571°F52°F84°F 200939°F 201033%0%
Sep 1670°F51°F84°F 201835°F 201133%0%
Sep 1770°F51°F83°F 202536°F 201333%0%
Sep 1870°F51°F87°F 201833°F 202033%0%
Sep 1969°F50°F79°F 202132°F 202034%0%
Sep 2069°F50°F79°F 200840°F 201034%0%
Sep 2169°F50°F80°F 202441°F 201234%0%
Sep 2268°F49°F80°F 201738°F 201435%0%
Sep 2368°F49°F89°F 201735°F 202235%0%
Sep 2467°F49°F89°F 201734°F 201236%0%
Sep 2567°F48°F89°F 201740°F 201336%0%
Sep 2666°F48°F86°F 201740°F 202236%0%
Sep 2766°F48°F78°F 202434°F 201237%0%
Sep 2866°F47°F78°F 201435°F 201237%0%
Sep 2965°F47°F79°F 201433°F 202238%0%
Sep 3065°F47°F79°F 202537°F 201738%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Sister Bay, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:10 AM, sunset 7:26 PM
September 30
sunrise 6:45 AM, sunset 6:31 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00472626 (Ephraim 1NE-Wwtp), public domain. Records: NOAA GHCN-Daily, station USC00472626, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.