Blackhawk climate

Blackhawk Weather in September

NOAA 1991-2020 normals for Rapid City 4NW, 3.9 km from Blackhawk

Average highs run from 79°F on September 1 to 67°F on September 30, and lows from 52°F to 42°F. Normal precipitation for the month is 1.48 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 Blackhawk, in °F, with the record for each date.020406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
74°F
Average low
47°F
Precipitation
1.48 in
Record high
104°FSep 2, 1960
Record low
18°FSep 24, 1985
Chance of a freeze
34%
Days of 90°F or more
2.5
Daylight
13 h 13 min to 11 h 46 min
Cloud cover
49%
Humidity
54%
Dew point
38°F
Wind
6.5 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 179°F52°F101°F 201240°F 197417%0%
Sep 279°F52°F104°F 196038°F 197417%0%
Sep 379°F51°F100°F 194836°F 197416%0%
Sep 479°F51°F104°F 196034°F 196216%0%
Sep 578°F51°F104°F 202035°F 202516%0%
Sep 678°F50°F104°F 197833°F 202516%0%
Sep 778°F50°F99°F 197832°F 202016%0%
Sep 877°F50°F103°F 195930°F 202016%0%
Sep 977°F49°F102°F 197924°F 202016%0%
Sep 1077°F49°F100°F 201227°F 202016%0%
Sep 1176°F49°F100°F 202529°F 198916%0%
Sep 1276°F48°F97°F 199028°F 201416%0%
Sep 1375°F48°F93°F 201529°F 194916%0%
Sep 1475°F48°F100°F 194824°F 199316%0%
Sep 1575°F47°F103°F 194832°F 196516%0%
Sep 1674°F47°F95°F 194930°F 196516%0%
Sep 1774°F47°F101°F 200026°F 199116%0%
Sep 1873°F46°F97°F 199824°F 199116%0%
Sep 1973°F46°F95°F 202222°F 199117%0%
Sep 2072°F45°F93°F 196029°F 198317%0%
Sep 2172°F45°F92°F 201323°F 199517%0%
Sep 2271°F45°F95°F 200719°F 199517%0%
Sep 2371°F44°F97°F 199224°F 198517%0%
Sep 2470°F44°F94°F 199218°F 198517%1%
Sep 2570°F44°F93°F 200824°F 198417%1%
Sep 2669°F43°F99°F 202422°F 197217%1%
Sep 2769°F43°F94°F 195226°F 195117%1%
Sep 2868°F42°F94°F 202125°F 195117%1%
Sep 2968°F42°F100°F 202421°F 198417%1%
Sep 3067°F42°F93°F 196725°F 195917%1%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Blackhawk, in percent, and of at least 0.1 inch of snowfall.051015201102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

September 1
sunrise 6:16 AM, sunset 7:29 PM
September 30
sunrise 6:50 AM, sunset 6:36 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00396947 (Rapid City 4NW), public domain. Records: NOAA GHCN-Daily, station USW00024090, 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.