Cedar Rapids weather in September: Cedar Rapids, Iowa: normal highs, lows, rain and records for September
Cedar Rapids in September has a normal high of 75°F and a normal low of 52°F, a daily mean of 63°F, falling from 79°F on the 1st to 69°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 3.40 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 11°C, 86 mm of precipitation in September.
- NOAA stationCedar Rapids Municipal Airport
- Station IDUSW00014990
- Location41.88°N 91.72°W
- Elevation868 ft (265 m)
- From the center6 miles
- Population137,904
- Jan 28° 11°
- Feb 33° 16°
- Mar 46° 27°
- Apr 60° 38°
- May 71° 50°
- Jun 80° 60°
- Jul 83° 63°
- Aug 81° 60°
- Sep 75° 52°
- Oct 62° 40°
- Nov 46° 28°
- Dec 33° 17°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Cedar Rapids in September?
The normal high is 75°F and the normal low 52°F, for a daily mean of 63.3°F. September is 7.5°F cooler than August and 12.6°F warmer than October. September is the 4th warmest month of the year in Cedar Rapids and the 6th wettest. Across the month the normal high falls 10°F, from 79°F on September 1 to 69°F on September 30. From one year to the next September's mean temperature typically moves about 3.1°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 60°F and 66°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 31%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 79°F | 57°F | 31% | 20% |
| September 8 | 77°F | 55°F | 30% | 20% |
| September 15 | 75°F | 52°F | 30% | 19% |
| September 22 | 73°F | 49°F | 29% | 18% |
| September 30 | 69°F | 46°F | 29% | 17% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 79°F | 57°F | 31% | 20% | 13 h 10 min |
| September 2 | 79°F | 57°F | 31% | 20% | 13 h 10 min |
| September 3 | 79°F | 57°F | 31% | 20% | 13 h 10 min |
| September 4 | 78°F | 56°F | 30% | 20% | 13 h |
| September 5 | 78°F | 56°F | 30% | 20% | 13 h |
| September 6 | 78°F | 56°F | 30% | 20% | 13 h |
| September 7 | 78°F | 55°F | 30% | 20% | 13 h |
| September 8 | 77°F | 55°F | 30% | 20% | 12 h 50 min |
| September 9 | 77°F | 55°F | 30% | 20% | 12 h 50 min |
| September 10 | 77°F | 54°F | 30% | 20% | 12 h 50 min |
| September 11 | 77°F | 54°F | 30% | 20% | 12 h 40 min |
| September 12 | 76°F | 53°F | 30% | 20% | 12 h 40 min |
| September 13 | 76°F | 53°F | 30% | 20% | 12 h 40 min |
| September 14 | 76°F | 53°F | 30% | 19% | 12 h 40 min |
| September 15 | 75°F | 52°F | 30% | 19% | 12 h 30 min |
| September 16 | 75°F | 52°F | 29% | 19% | 12 h 30 min |
| September 17 | 75°F | 51°F | 29% | 19% | 12 h 30 min |
| September 18 | 74°F | 51°F | 29% | 19% | 12 h 20 min |
| September 19 | 74°F | 51°F | 29% | 19% | 12 h 20 min |
| September 20 | 73°F | 50°F | 29% | 19% | 12 h 20 min |
| September 21 | 73°F | 50°F | 29% | 19% | 12 h 20 min |
| September 22 | 73°F | 49°F | 29% | 18% | 12 h 10 min |
| September 23 | 72°F | 49°F | 29% | 18% | 12 h 10 min |
| September 24 | 72°F | 49°F | 29% | 18% | 12 h 10 min |
| September 25 | 71°F | 48°F | 29% | 18% | 12 h 10 min |
| September 26 | 71°F | 48°F | 29% | 18% | 12 h |
| September 27 | 71°F | 47°F | 29% | 18% | 12 h |
| September 28 | 70°F | 47°F | 29% | 18% | 12 h |
| September 29 | 70°F | 47°F | 29% | 18% | 11 h 50 min |
| September 30 | 69°F | 46°F | 29% | 17% | 11 h 50 min |
- Normal high
- 75°FSeptember average
- Normal low
- 52°FSeptember average
- Precipitation
- 3.40 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 22
- Days at 80°F or more
- 10
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014990; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Cedar Rapids in September?
On a given September day the chance of 0.01 inch or more is 30% on average, highest around September 1 (31%). In all, 3.40 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in Cedar Rapids, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014990.
How humid and windy is Cedar Rapids in September?
At 3 p.m. the normal temperature is 68°F with 48% relative humidity and a dew point of 47°F; at 6 a.m. it is 49°F with 89% humidity. The wind averages 9.0 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 49°F | 46°F | 89% | 7.2 mph | 74% |
| 9 a.m. | 58°F | 49°F | 72% | 10.3 mph | 71% |
| noon | 65°F | 48°F | 54% | 11.7 mph | 67% |
| 3 p.m. | 68°F | 47°F | 48% | 12.1 mph | 65% |
| 6 p.m. | 62°F | 48°F | 60% | 7.6 mph | 72% |
| 9 p.m. | 56°F | 48°F | 74% | 7.7 mph | 77% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014990. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Cedar Rapids?
The warmest September temperature on Cedar Rapids's official record (since 1893) is 105°F, on September 4, 1925; the coldest is 22°F, on September 30, 1899. The wettest September brought 15.38 in (1914).
The September mean against the 1991-2020 normal of 63.3°F: 2021 66.5°F (+3.2), 2022 65.5°F (+2.2), 2023 68.3°F (+5.0), 2024 67.3°F (+4.0), 2026 68.5°F (+5.2). 5 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 66.5°F | +3.2°F | 1.58 in |
| 2022 | 65.5°F | +2.2°F | 1.69 in |
| 2023 | 68.3°F | +5.0°F | 1.07 in |
| 2024 | 67.3°F | +4.0°F | 0.00 in |
| 2026 | 68.5°F | +5.2°F | 11.12 in |
Source: records: ACIS, NWS threaded record CIDthr; recent months: ACIS, station USW00014990. Records and recent months use complete months only.
How does September in Cedar Rapids compare across Iowa?
Across the 132 places PlainClimate covers in Iowa, September normal highs run from 71°F in Northwood to 79°F in Glenwood; Cedar Rapids's is 75°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.