Heidelberg climate

Heidelberg Weather in September

NOAA 1991-2020 normals for Santa Rosa 3 Wnw, 7.7 km from Heidelberg

Average highs run from 95°F on September 1 to 91°F on September 30, and lows from 74°F to 69°F. Normal precipitation for the month is 5.56 in over about 9 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 Heidelberg, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
93°F
Average low
72°F
Precipitation
5.56 in
Record high
107°FSep 6, 2000
Record low
48°FSep 28, 1942
Chance of a freeze
0%
Days of 90°F or more
23.0
Daylight
12 h 39 min to 11 h 55 min
Cloud cover
51%
Humidity
72%
Dew point
71°F
Wind
8.7 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 195°F74°F103°F 200067°F 191529%0%
Sep 295°F74°F102°F 193968°F 192130%0%
Sep 395°F74°F103°F 200061°F 199730%0%
Sep 495°F74°F103°F 200066°F 191931%0%
Sep 594°F74°F104°F 200063°F 197431%0%
Sep 694°F74°F107°F 200058°F 197431%0%
Sep 794°F74°F104°F 200058°F 191831%0%
Sep 894°F73°F102°F 202659°F 191831%0%
Sep 994°F73°F103°F 202659°F 191832%0%
Sep 1093°F73°F102°F 202362°F 199432%0%
Sep 1193°F73°F103°F 202666°F 191832%0%
Sep 1293°F73°F104°F 193763°F 195932%0%
Sep 1393°F73°F101°F 195060°F 194031%0%
Sep 1493°F72°F102°F 202661°F 194031%0%
Sep 1593°F72°F102°F 202359°F 194531%0%
Sep 1692°F72°F102°F 202357°F 194531%0%
Sep 1792°F72°F103°F 194659°F 193430%0%
Sep 1892°F72°F100°F 192059°F 198130%0%
Sep 1992°F72°F100°F 192057°F 198130%0%
Sep 2092°F71°F102°F 194758°F 199129%0%
Sep 2192°F71°F102°F 194758°F 191829%0%
Sep 2292°F71°F100°F 193756°F 193829%0%
Sep 2391°F71°F100°F 193756°F 199528%0%
Sep 2491°F71°F99°F 192056°F 197528%0%
Sep 2591°F70°F100°F 194057°F 191427%0%
Sep 2691°F70°F99°F 192057°F 200027%0%
Sep 2791°F70°F101°F 201153°F 194026%0%
Sep 2891°F70°F99°F 195348°F 194226%0%
Sep 2991°F69°F99°F 192051°F 191825%0%
Sep 3091°F69°F99°F 193853°F 191825%0%

Chance of rain

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

September 1
sunrise 7:12 AM, sunset 7:51 PM
September 30
sunrise 7:24 AM, sunset 7:19 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00418059 (Santa Rosa 3 Wnw), public domain. Records: NOAA GHCN-Daily, station USC00419588, 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.