Davenport, IA weather in September
Davenport is mild in September, with some rain: highs average 78°F and nights drop to about 54°F. Rain falls on about 8 days. A good month for most outdoor plans.
- Normal high
- 78°F
- Normal low
- 54°F
- Wet days
- 8
- 3.3 in total
- Muggy days
- 4
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 82°F | 72°F |
| Normal low | 60°F | 49°F |
| Chance of a wet day | 29% | 28% |
| Sunrise / sunset | 6:28 am / 7:36 pm | 6:58 am / 6:46 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 am57°Fdew point 53°F
- 9 am67°Fdew point 56°F
- Noon74°Fdew point 56°F
- 3 pm76°Fdew point 55°F
- 6 pm70°Fdew point 56°F
- 9 pm63°Fdew point 56°F
NOAA hourly normals (local standard time) from Moline Quad City Intl Airport (5 mi away); average wind 6 mph; clear or few clouds in 68% of daytime hours, mostly cloudy or overcast in 25%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F14 of 30
- Hot dayshigh 90°F or more3 of 30
- Muggy daysdaily mean dew point 65°F or more4 of 30
- Wet daysat least 0.01 in of rain or melted snow8 of 30
- Notable rainat least 0.10 in5 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 3.3 in; a dry September brings about 1.4 in and a wet one about 4.5 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202007: average high 83°F
- Coolest September1993: average high 71°F
- Wettest September2008: 10.9 in
- Driest September2002: 0.2 in
- Highest reading99°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 | 84°F | 78°F | 65°F |
| Normal low | 63°F | 54°F | 43°F |
| Wet days | 9 | 8 | 9 |
| Comfortable days | 5 | 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: Madison, WI123 mi · high 73°F · 9 wet days
How Davenport ranks in September
- Normal high223rd warmest of 378 cities; 1st of 3 in Iowa
- Wet days214th driest of 378
- Comfortable days115th most of 342
What to pack for Davenport in September
- A rain jacket or umbrella – rain on about 8 days
Heating and cooling
September has 84 heating degree days and 116 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Davenport in September?
The normal high is 78°F and the normal low is 54°F. From 1991 to 2020 the hottest September reading was 99°F (September 9, 2013).
Does it rain a lot in Davenport in September?
About 8 days in September have at least 0.01 in of precipitation, and the normal total is 3.3 in. The wettest September in 1991-2020 was in 2008 (10.9 in); the driest was in 2002 (0.2 in).
Is September a good time to visit Davenport?
September ranks 2nd of 12 months on our comfort score for Davenport (66 out of 100). It has about 14 comfortable days and about 3 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall, humidity and wind by hour and cloud cover: Moline Quad City Intl Airport (USW00014923), 4.9 mi SE of the city center, 592 ft . NOAA normals and daily records, 1991-2020.
- Snow depth: Clinton #1 (USC00131635), 25 mi NE of the city center, 585 ft . NOAA normals and daily records, 1991-2020.
- Frost dates: Rock Island L&D 15 (USC00117391), 0.8 mi ESE of the city center, 568 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Quad City International Airport (725440-14923), 5.9 mi SSE of the city center, 576 ft . Hourly observations, 1991-2020.