Cedar Rapids, IA weather in September
September in Cedar Rapids: mild, with some rain. Highs 77°F, lows 53°F, rain on about 9 days. A good month for most outdoor plans.
- Normal high
- 77°F
- Normal low
- 53°F
- Wet days
- 9
- 4.0 in total
- Muggy days
- 4
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 81°F | 72°F |
| Normal low | 58°F | 48°F |
| Chance of a wet day | 30% | 29% |
| Sunrise / sunset | 6:32 am / 7:40 pm | 7:02 am / 6:50 pm |
| Daylight | 13.1 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical September day
- 6 am55°Fdew point 52°F
- 9 am64°Fdew point 56°F
- Noon71°Fdew point 55°F
- 3 pm73°Fdew point 55°F
- 6 pm68°Fdew point 55°F
- 9 pm61°Fdew point 55°F
NOAA hourly normals (local standard time) from Cedar Rapids Muni Airport (9 mi away); average wind 8 mph; clear or few clouds in 67% of daytime hours, mostly cloudy or overcast in 26%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F14 of 30
- Hot dayshigh 90°F or more2 of 30
- Muggy daysdaily mean dew point 65°F or more4 of 30
- Wet daysat least 0.01 in of rain or melted snow9 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 4.0 in; a dry September brings about 2.5 in and a wet one about 5.2 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202017: average high 82°F
- Coolest September1993: average high 69°F
- Wettest September2018: 8.4 in
- Driest September2004: 0.6 in
- Highest reading100°F (September 9, 2013)
- Lowest reading30°F (September 24, 2012)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 83°F | 77°F | 64°F |
| Normal low | 61°F | 53°F | 42°F |
| Wet days | 10 | 9 | 10 |
| Comfortable days | 6 | 14 | 12 |
| Daylight | 13.8 h | 12.5 h | 11.1 h |
Highs change by -6°F from August and -13°F into October.
Nearby alternatives in September
- Cooler: Rochester, MN145 mi · high 72°F · 9 wet days
How Cedar Rapids ranks in September
- Normal high237th warmest of 378 cities; 2nd of 3 in Iowa
- Wet days235th driest of 378
- Comfortable days106th most of 342
What to pack for Cedar Rapids in September
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 97 heating degree days and 101 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Cedar Rapids in September?
The normal high is 77°F and the normal low is 53°F. From 1991 to 2020 the hottest September reading was 100°F (September 9, 2013).
Does it rain a lot in Cedar Rapids in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 4.0 in. The wettest September in 1991-2020 was in 2018 (8.4 in); the driest was in 2004 (0.6 in).
Is September a good time to visit Cedar Rapids?
September ranks 2nd of 12 months on our comfort score for Cedar Rapids (66 out of 100). It has about 14 comfortable days and about 2 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Cedar Rapids #1 (USC00131319), 4.0 mi NE of the city center, 813 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Cedar Rapids Muni Airport (USW00014990), 9.4 mi SSW of the city center, 868 ft (60 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Eastern Iowa Regional Airport (725450-14990), 9.6 mi SSW of the city center, 840 ft . Hourly observations, 1991-2020.