El Valle de Arroyo Seco climate

El Valle de Arroyo Seco Weather in September

NOAA 1991-2020 normals for Alcalde, 14.4 km from El Valle de Arroyo Seco

Average highs run from 83°F on September 1 to 75°F on September 30, and lows from 50°F to 39°F. Normal precipitation for the month is 1.25 in over about 5 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 El Valle de Arroyo Seco, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
80°F
Average low
45°F
Precipitation
1.25 in
Record high
94°FSep 11, 1934
Record low
23°FSep 29, 1936
Chance of a freeze
30%
Days of 90°F or more
1.9
Daylight
12 h 55 min to 11 h 51 min
Cloud cover
42%
Humidity
52%
Dew point
38°F
Wind
6.0 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 183°F50°F88°F 195043°F 193221%0%
Sep 283°F50°F88°F 195040°F 197621%0%
Sep 383°F49°F90°F 194836°F 196121%0%
Sep 483°F49°F89°F 194833°F 196121%0%
Sep 583°F49°F88°F 195238°F 196120%0%
Sep 682°F48°F90°F 202042°F 192820%0%
Sep 782°F48°F88°F 202042°F 194220%0%
Sep 882°F48°F86°F 197732°F 202020%0%
Sep 982°F47°F87°F 198431°F 202020%0%
Sep 1082°F47°F90°F 202132°F 202020%0%
Sep 1181°F47°F94°F 193434°F 202020%0%
Sep 1281°F46°F86°F 193440°F 192419%0%
Sep 1381°F46°F86°F 193539°F 198919%0%
Sep 1481°F45°F89°F 200034°F 198919%0%
Sep 1580°F45°F85°F 195637°F 199319%0%
Sep 1680°F45°F87°F 195638°F 194119%0%
Sep 1780°F44°F87°F 195635°F 196819%0%
Sep 1879°F44°F84°F 195230°F 197118%0%
Sep 1979°F43°F83°F 195226°F 197118%0%
Sep 2079°F43°F85°F 201433°F 196518%0%
Sep 2178°F43°F83°F 201625°F 198318%0%
Sep 2278°F42°F82°F 201229°F 199518%0%
Sep 2378°F42°F80°F 192231°F 199518%0%
Sep 2478°F41°F81°F 197932°F 200617%0%
Sep 2577°F41°F83°F 202029°F 200017%0%
Sep 2677°F40°F83°F 202031°F 197017%0%
Sep 2776°F40°F84°F 201528°F 199617%0%
Sep 2876°F40°F82°F 199824°F 193617%0%
Sep 2976°F39°F83°F 201023°F 193617%0%
Sep 3075°F39°F83°F 202425°F 198516%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at El Valle de Arroyo Seco, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

September 1
sunrise 6:36 AM, sunset 7:31 PM
September 30
sunrise 6:58 AM, sunset 6:49 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00290245 (Alcalde), public domain. Records: NOAA GHCN-Daily, station USC00295084, 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.