Galena, IL weather in September
September in Galena: mild, with some rain. Highs 76°F, lows 52°F, about 9 days with rain. A good month for most outdoor plans.
- Normal high
- 76°F
- Normal low
- 52°F
- Wet days
- 9
- 3.9 in total
- Muggy days
- 3
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 81°F | 70°F |
| Normal low | 58°F | 46°F |
| Chance of a wet day | 32% | 30% |
| Sunrise / sunset | 6:26 am / 7:36 pm | 6:57 am / 6:45 pm |
| Daylight | 13.2 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 am63°Fdew point 55°F
- Noon69°Fdew point 54°F
- 3 pm71°Fdew point 54°F
- 6 pm66°Fdew point 55°F
- 9 pm60°Fdew point 53°F
NOAA hourly normals (local standard time) from Dubuque Rgnl Airport (14 mi away); average wind 8 mph.
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 more3 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 below1 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 3.9 in; a dry September brings about 2.0 in and a wet one about 4.5 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, 1991-20202005: average high 81°F
- Coolest September1993: average high 66°F
- Wettest September2019: 12.6 in
- Driest September2017: 0.5 in
- Highest reading98°F (September 10, 2013)
- Lowest reading27°F (September 24, 1995)
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 | 76°F | 63°F |
| Normal low | 61°F | 52°F | 41°F |
| Wet days | 10 | 9 | 9 |
| Comfortable days | 7 | 14 | 11 |
| Daylight | 13.8 h | 12.5 h | 11.1 h |
Highs change by -7°F from August and -13°F into October.
How Galena ranks in September
- Normal high258th warmest of 378 cities; 5th of 8 in Illinois
- Wet days257th driest of 378
- Comfortable days111th most of 342
What to pack for Galena in September
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 116 heating degree days and 87 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Galena in September?
The normal high is 76°F and the normal low is 52°F. From 1991 to 2020 the hottest September reading was 98°F (September 10, 2013).
Does it rain a lot in Galena in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 3.9 in. The wettest September in 1991-2020 was in 2019 (12.6 in); the driest was in 2017 (0.5 in).
Is September a good time to visit Galena?
September ranks 2nd of 12 months on our comfort score for Galena (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 and frost dates: Bellevue L&D 12 (USC00130608), 11 mi S of the city center, 603 ft . NOAA normals and daily records, 1991-2020.
- Rain, snowfall and snow depth: Galena (USC00113312), 2.5 mi ESE of the city center, 822 ft (190 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Dubuque Rgnl Airport (USW00094908), 14 mi W of the city center, 1,056 ft (424 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Dubuque Regional Airport (725470-94908), 14 mi W of the city center, 1,040 ft (408 ft higher than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).