Merton climate

Merton Weather in September

NOAA 1991-2020 normals for Richfield 3 Ssw, 10.7 km from Merton

Average highs run from 78°F on September 1 to 67°F on September 30, and lows from 55°F to 46°F. Normal precipitation for the month is 3.30 in.

September day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Merton, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
73°F
Average low
51°F
Precipitation
3.30 in
Record high
101°FSep 1, 1953
Record low
25°FSep 28, 1942
Chance of a freeze
10%
Days of 90°F or more
1.2
Daylight
13 h 10 min to 11 h 46 min
Cloud cover
53%
Humidity
74%
Dew point
53°F
Wind
9.4 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 178°F55°F101°F 195340°F 19490%
Sep 277°F55°F101°F 195342°F 20090%
Sep 377°F55°F94°F 195341°F 19340%
Sep 477°F55°F96°F 192534°F 19870%
Sep 577°F54°F93°F 191242°F 19500%
Sep 676°F54°F94°F 192238°F 19240%
Sep 776°F54°F100°F 192238°F 19560%
Sep 876°F53°F97°F 197839°F 20250%
Sep 975°F53°F97°F 195539°F 19140%
Sep 1075°F53°F98°F 193135°F 19170%
Sep 1175°F53°F97°F 193135°F 19170%
Sep 1274°F52°F93°F 195235°F 19550%
Sep 1374°F52°F96°F 193937°F 19530%
Sep 1474°F52°F98°F 193934°F 19230%
Sep 1573°F51°F99°F 193934°F 20070%
Sep 1673°F51°F92°F 199430°F 19160%
Sep 1773°F51°F92°F 193135°F 19160%
Sep 1872°F50°F91°F 193533°F 19160%
Sep 1972°F50°F92°F 194733°F 19180%
Sep 2072°F50°F90°F 189530°F 19560%
Sep 2171°F49°F90°F 189528°F 19010%
Sep 2271°F49°F92°F 189531°F 19740%
Sep 2370°F49°F93°F 193727°F 19130%
Sep 2470°F48°F89°F 193530°F 19500%
Sep 2570°F48°F90°F 192026°F 19420%
Sep 2669°F48°F89°F 192027°F 19260%
Sep 2769°F47°F89°F 199830°F 19370%
Sep 2868°F47°F89°F 195225°F 19420%
Sep 2968°F47°F94°F 195328°F 19420%
Sep 3067°F46°F89°F 195228°F 18990%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Merton, in percent, and of at least 0.1 inch of snowfall.00.21102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:18 AM, sunset 7:28 PM
September 30
sunrise 6:50 AM, sunset 6:36 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00477148 (Richfield 3 Ssw), public domain. Records: NOAA GHCN-Daily, station USC00478937, 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.