Port Byron climate

Port Byron Weather in September

NOAA 1991-2020 normals for Le Claire L&d 14, 6.5 km from Port Byron

Average highs run from 81°F on September 1 to 71°F on September 30, and lows from 61°F to 50°F. Normal precipitation for the month is 3.35 in over about 8 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 Port Byron, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
77°F
Average low
56°F
Precipitation
3.35 in
Record high
97°FSep 9, 2013
Record low
31°FSep 29, 2003
Chance of a freeze
0%
Days of 90°F or more
1.5
Daylight
13 h 06 min to 11 h 48 min
Cloud cover
48%
Humidity
71%
Dew point
54°F
Wind
9.2 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 181°F61°F95°F 201145°F 200927%0%
Sep 281°F61°F94°F 202644°F 201727%0%
Sep 380°F61°F94°F 202646°F 201327%0%
Sep 480°F60°F95°F 202342°F 199727%0%
Sep 580°F60°F91°F 202647°F 200327%0%
Sep 680°F60°F92°F 201541°F 201127%0%
Sep 779°F59°F92°F 201339°F 202527%0%
Sep 879°F59°F89°F 200238°F 202427%0%
Sep 979°F59°F97°F 201341°F 200826%0%
Sep 1079°F58°F96°F 201342°F 199926%0%
Sep 1178°F58°F93°F 200043°F 199926%0%
Sep 1278°F58°F91°F 200536°F 201426%0%
Sep 1378°F57°F97°F 202533°F 201426%0%
Sep 1477°F57°F93°F 202538°F 199626%0%
Sep 1577°F56°F91°F 202533°F 200726%0%
Sep 1677°F56°F91°F 202538°F 201426%0%
Sep 1776°F56°F91°F 201839°F 199926%0%
Sep 1876°F55°F89°F 200741°F 201226%0%
Sep 1976°F55°F93°F 201340°F 201226%0%
Sep 2075°F54°F94°F 202233°F 200626%0%
Sep 2175°F54°F89°F 200538°F 199926%0%
Sep 2275°F54°F91°F 201735°F 199926%0%
Sep 2374°F53°F92°F 201731°F 201226%0%
Sep 2474°F53°F89°F 200731°F 201226%0%
Sep 2573°F52°F89°F 201734°F 200126%0%
Sep 2673°F52°F87°F 199835°F 200126%0%
Sep 2773°F52°F89°F 202136°F 201026%0%
Sep 2872°F51°F83°F 201435°F 200326%0%
Sep 2972°F51°F89°F 200231°F 200326%0%
Sep 3071°F50°F92°F 202332°F 200326%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Port Byron, 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).

September 1
sunrise 6:28 AM, sunset 7:34 PM
September 30
sunrise 6:57 AM, sunset 6:45 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00134705 (Le Claire L&d 14), public domain. Records: NOAA GHCN-Daily, station USW00094982, 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.