Monson climate

Monson Weather in September

NOAA 1991-2020 normals for Sebec Lake, 21.7 km from Monson

Average highs run from 75°F on September 1 to 63°F on September 30, and lows from 50°F to 40°F. Normal precipitation for the month is 4.03 in over about 11 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 Monson, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
69°F
Average low
45°F
Precipitation
4.03 in
Record high
92°FSep 9, 2002
Record low
27°FSep 29, 2000
Chance of a freeze
45%
Days of 90°F or more
0.5
Daylight
13 h 15 min to 11 h 45 min
Cloud cover
59%
Humidity
82%
Dew point
50°F
Wind
4.5 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°F50°F88°F 201044°F 200236%0%
Sep 274°F50°F87°F 201042°F 200136%0%
Sep 374°F49°F87°F 201039°F 200136%0%
Sep 474°F49°F86°F 199947°F 200436%0%
Sep 574°F49°F86°F 202343°F 200436%0%
Sep 673°F48°F84°F 202339°F 201336%0%
Sep 773°F48°F89°F 202339°F 200036%0%
Sep 873°F48°F88°F 200242°F 201336%0%
Sep 972°F48°F92°F 200237°F 201336%0%
Sep 1072°F47°F91°F 200239°F 200336%0%
Sep 1171°F47°F87°F 201338°F 200836%0%
Sep 1271°F47°F77°F 200441°F 200636%0%
Sep 1371°F46°F79°F 201237°F 201436%0%
Sep 1470°F46°F80°F 200338°F 199836%0%
Sep 1570°F46°F80°F 200339°F 201436%0%
Sep 1669°F45°F82°F 202438°F 200936%0%
Sep 1769°F45°F82°F 201837°F 200936%0%
Sep 1868°F45°F81°F 202435°F 201436%0%
Sep 1968°F44°F78°F 200231°F 201436%0%
Sep 2067°F44°F77°F 201634°F 202036%0%
Sep 2167°F43°F82°F 200234°F 202037%0%
Sep 2267°F43°F79°F 201937°F 200837%0%
Sep 2366°F43°F80°F 201735°F 200837%0%
Sep 2466°F42°F84°F 201730°F 201837%0%
Sep 2565°F42°F85°F 201734°F 200937%0%
Sep 2665°F42°F86°F 201730°F 200937%0%
Sep 2764°F41°F78°F 201730°F 200037%0%
Sep 2864°F41°F80°F 201435°F 201237%0%
Sep 2963°F40°F76°F 202527°F 200037%0%
Sep 3063°F40°F70°F 202330°F 200037%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Monson, 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 (EDT).

September 1
sunrise 6:00 AM, sunset 7:15 PM
September 30
sunrise 6:35 AM, sunset 6:20 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00177654 (Sebec Lake), public domain. Records: NOAA GHCN-Daily, station USW00094626, 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.