Mountain View climate

Mountain View Weather in September

NOAA 1991-2020 normals for Mtn View, 3.2 km from Mountain View

Average highs run from 88°F on September 1 to 79°F on September 30, and lows from 65°F to 54°F. Normal precipitation for the month is 3.54 in over about 6 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 Mountain View, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
84°F
Average low
60°F
Precipitation
3.54 in
Record high
107°FSep 1, 2000
Record low
30°FSep 24, 1989
Chance of a freeze
1%
Days of 90°F or more
8.4
Daylight
12 h 56 min to 11 h 50 min
Cloud cover
45%
Humidity
69%
Dew point
59°F
Wind
3.8 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 188°F65°F107°F 200043°F 196721%0%
Sep 288°F64°F102°F 200043°F 196521%0%
Sep 387°F64°F105°F 200044°F 196521%0%
Sep 487°F64°F105°F 200044°F 197421%0%
Sep 587°F64°F102°F 199041°F 199721%0%
Sep 687°F63°F104°F 199047°F 198821%0%
Sep 786°F63°F104°F 199840°F 198821%0%
Sep 886°F63°F100°F 199941°F 198821%0%
Sep 986°F62°F97°F 198043°F 199421%0%
Sep 1085°F62°F101°F 202641°F 197621%0%
Sep 1185°F62°F98°F 198338°F 197621%0%
Sep 1285°F61°F98°F 198043°F 199221%0%
Sep 1385°F61°F99°F 197141°F 196821%0%
Sep 1484°F60°F100°F 197139°F 196421%0%
Sep 1584°F60°F99°F 200042°F 201321%0%
Sep 1684°F60°F100°F 198040°F 197921%0%
Sep 1783°F59°F98°F 192539°F 199321%0%
Sep 1883°F59°F99°F 192539°F 198121%0%
Sep 1983°F59°F98°F 192538°F 198121%0%
Sep 2082°F58°F100°F 200537°F 199121%0%
Sep 2182°F58°F99°F 192636°F 199121%0%
Sep 2282°F57°F97°F 198838°F 198221%0%
Sep 2381°F57°F98°F 200531°F 199421%0%
Sep 2481°F57°F95°F 200530°F 198921%0%
Sep 2581°F56°F93°F 198632°F 196520%0%
Sep 2680°F56°F95°F 199838°F 197520%0%
Sep 2780°F55°F93°F 198632°F 199420%0%
Sep 2880°F55°F95°F 199830°F 199320%0%
Sep 2979°F55°F97°F 199931°F 196720%0%
Sep 3079°F54°F96°F 199831°F 199220%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Mountain View, 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 (CDT).

September 1
sunrise 6:40 AM, sunset 7:36 PM
September 30
sunrise 7:03 AM, sunset 6:53 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00035046 (Mtn View), public domain. Records: NOAA GHCN-Daily, station USC00032366, 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.