Dorchester climate

Dorchester Weather in September

NOAA 1991-2020 normals for Friend 3E, 9.1 km from Dorchester

Average highs run from 81°F on September 1 to 73°F on September 30, and lows from 57°F to 47°F. Normal precipitation for the month is 2.84 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 Dorchester, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
77°F
Average low
52°F
Precipitation
2.84 in
Record high
106°FSep 2, 2000
Record low
26°FSep 29, 1984
Chance of a freeze
16%
Days of 90°F or more
3.2
Daylight
13 h 04 min to 11 h 48 min
Cloud cover
46%
Humidity
64%
Dew point
53°F
Wind
10.7 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 181°F57°F101°F 197542°F 194928%0%
Sep 280°F57°F106°F 200043°F 197428%0%
Sep 380°F56°F99°F 200035°F 197428%0%
Sep 480°F56°F102°F 201240°F 197428%0%
Sep 580°F56°F98°F 199043°F 197428%0%
Sep 680°F55°F100°F 198441°F 195027%0%
Sep 780°F55°F97°F 202642°F 202427%0%
Sep 879°F55°F101°F 202642°F 198627%0%
Sep 979°F54°F100°F 201341°F 200827%0%
Sep 1079°F54°F99°F 201341°F 197627%0%
Sep 1179°F54°F97°F 199041°F 197527%0%
Sep 1279°F53°F96°F 199137°F 197527%0%
Sep 1378°F53°F96°F 199035°F 201427%0%
Sep 1478°F53°F95°F 201736°F 199327%0%
Sep 1578°F52°F94°F 199731°F 199327%0%
Sep 1678°F52°F95°F 195235°F 198427%0%
Sep 1777°F52°F101°F 195335°F 198127%0%
Sep 1877°F51°F98°F 200034°F 197327%0%
Sep 1977°F51°F100°F 202229°F 199127%0%
Sep 2076°F51°F103°F 202237°F 199126%0%
Sep 2176°F50°F103°F 200532°F 199926%0%
Sep 2276°F50°F97°F 201727°F 199526%0%
Sep 2375°F50°F93°F 201731°F 198326%0%
Sep 2475°F49°F93°F 200533°F 198926%0%
Sep 2575°F49°F93°F 199029°F 197526%0%
Sep 2674°F49°F95°F 199028°F 198426%0%
Sep 2774°F48°F94°F 202135°F 195126%0%
Sep 2873°F48°F102°F 195328°F 195126%0%
Sep 2973°F47°F96°F 202326°F 198425%0%
Sep 3073°F47°F96°F 202328°F 198425%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Dorchester, 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 6:56 AM, sunset 8:00 PM
September 30
sunrise 7:24 AM, sunset 7:12 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00253065 (Friend 3E), public domain. Records: NOAA GHCN-Daily, station USW00014939, 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.