Mammoth climate

Mammoth Weather in September

NOAA 1991-2020 normals for San Manuel, 13.6 km from Mammoth

Average highs run from 93°F on September 1 to 86°F on September 30, and lows from 69°F to 62°F. Normal precipitation for the month is 1.29 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 Mammoth, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
90°F
Average low
66°F
Precipitation
1.29 in
Record high
106°FSep 10, 2023
Record low
41°FSep 26, 1958
Chance of a freeze
0%
Days of 90°F or more
15.0
Daylight
12 h 50 min to 11 h 52 min
Cloud cover
33%
Humidity
43%
Dew point
49°F
Wind
6.7 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 193°F69°F102°F 197059°F 196625%0%
Sep 293°F69°F102°F 197062°F 196125%0%
Sep 393°F69°F102°F 197949°F 196124%0%
Sep 492°F69°F103°F 197345°F 196124%0%
Sep 592°F69°F103°F 197956°F 196123%0%
Sep 692°F68°F103°F 197958°F 197623%0%
Sep 792°F68°F103°F 197956°F 197622%0%
Sep 892°F68°F100°F 197755°F 196122%0%
Sep 992°F68°F101°F 202357°F 196221%0%
Sep 1091°F68°F106°F 202357°F 202021%0%
Sep 1191°F67°F101°F 197159°F 201120%0%
Sep 1291°F67°F99°F 197958°F 196120%0%
Sep 1391°F67°F100°F 195657°F 195919%0%
Sep 1490°F67°F100°F 195455°F 195819%0%
Sep 1590°F66°F101°F 197155°F 195818%0%
Sep 1690°F66°F100°F 197350°F 195918%0%
Sep 1790°F66°F101°F 195649°F 195917%0%
Sep 1889°F66°F100°F 195649°F 195917%0%
Sep 1989°F65°F100°F 196251°F 195916%0%
Sep 2089°F65°F98°F 196245°F 196516%0%
Sep 2188°F65°F99°F 195447°F 196515%0%
Sep 2288°F64°F96°F 197348°F 196515%0%
Sep 2388°F64°F95°F 196350°F 197114%0%
Sep 2488°F64°F98°F 197950°F 196114%0%
Sep 2587°F64°F97°F 202447°F 195814%0%
Sep 2687°F63°F98°F 196941°F 195813%0%
Sep 2787°F63°F100°F 202448°F 195813%0%
Sep 2886°F63°F100°F 202453°F 201313%0%
Sep 2986°F62°F97°F 202441°F 195812%0%
Sep 3086°F62°F98°F 197851°F 196012%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Mammoth, 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 (MST).

September 1
sunrise 5:57 AM, sunset 6:47 PM
September 30
sunrise 6:16 AM, sunset 6:08 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00027530 (San Manuel), public domain. Records: NOAA GHCN-Daily, station USC00027530, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.