La Crosse weather in September: La Crosse, Wisconsin: normal highs, lows, rain and records for September
La Crosse in September has a normal high of 76°F and a normal low of 54°F, a daily mean of 65°F, falling from 81°F on the 1st to 70°F by the 30th. Measurable precipitation falls on 10 days in a normal September, 3.63 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 12°C, 92 mm of precipitation in September.
- NOAA stationLa Crosse Regional Airport
- Station IDUSW00014920
- Location43.88°N 91.25°W
- Elevation652 ft (199 m)
- Population51,049
- Jan 27° 11°
- Feb 33° 14°
- Mar 46° 26°
- Apr 60° 38°
- May 72° 50°
- Jun 82° 60°
- Jul 85° 65°
- Aug 83° 62°
- Sep 76° 54°
- Oct 62° 42°
- Nov 46° 30°
- Dec 33° 18°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is La Crosse in September?
The normal high is 76°F and the normal low 54°F, for a daily mean of 64.8°F. September is 8.0°F cooler than August and 13.1°F warmer than October. September is the 4th warmest month of the year in La Crosse and the 6th wettest. Across the month the normal high falls 11°F, from 81°F on September 1 to 70°F on September 30. From one year to the next September's mean temperature typically moves about 3.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 62°F and 68°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 32%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 81°F | 59°F | 30% | 20% |
| September 8 | 79°F | 57°F | 31% | 20% |
| September 15 | 76°F | 55°F | 31% | 20% |
| September 22 | 73°F | 52°F | 32% | 20% |
| September 30 | 70°F | 48°F | 31% | 19% |
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 | 81°F | 59°F | 30% | 20% | 13 h 20 min |
| September 2 | 80°F | 59°F | 30% | 20% | 13 h 10 min |
| September 3 | 80°F | 59°F | 30% | 20% | 13 h 10 min |
| September 4 | 80°F | 58°F | 30% | 20% | 13 h 10 min |
| September 5 | 79°F | 58°F | 31% | 20% | 13 h |
| September 6 | 79°F | 58°F | 31% | 20% | 13 h |
| September 7 | 79°F | 58°F | 31% | 20% | 13 h |
| September 8 | 79°F | 57°F | 31% | 20% | 13 h |
| September 9 | 78°F | 57°F | 31% | 20% | 12 h 50 min |
| September 10 | 78°F | 56°F | 31% | 20% | 12 h 50 min |
| September 11 | 78°F | 56°F | 31% | 20% | 12 h 50 min |
| September 12 | 77°F | 56°F | 31% | 20% | 12 h 40 min |
| September 13 | 77°F | 55°F | 31% | 20% | 12 h 40 min |
| September 14 | 76°F | 55°F | 31% | 20% | 12 h 40 min |
| September 15 | 76°F | 55°F | 31% | 20% | 12 h 40 min |
| September 16 | 76°F | 54°F | 32% | 20% | 12 h 30 min |
| September 17 | 75°F | 54°F | 32% | 20% | 12 h 30 min |
| September 18 | 75°F | 53°F | 32% | 20% | 12 h 30 min |
| September 19 | 74°F | 53°F | 32% | 20% | 12 h 20 min |
| September 20 | 74°F | 52°F | 32% | 20% | 12 h 20 min |
| September 21 | 74°F | 52°F | 32% | 20% | 12 h 20 min |
| September 22 | 73°F | 52°F | 32% | 20% | 12 h 10 min |
| September 23 | 73°F | 51°F | 32% | 20% | 12 h 10 min |
| September 24 | 72°F | 51°F | 32% | 20% | 12 h 10 min |
| September 25 | 72°F | 50°F | 32% | 20% | 12 h 10 min |
| September 26 | 71°F | 50°F | 32% | 19% | 12 h |
| September 27 | 71°F | 50°F | 32% | 19% | 12 h |
| September 28 | 70°F | 49°F | 32% | 19% | 12 h |
| September 29 | 70°F | 49°F | 32% | 19% | 11 h 50 min |
| September 30 | 70°F | 48°F | 31% | 19% | 11 h 50 min |
- Normal high
- 76°FSeptember average
- Normal low
- 54°FSeptember average
- Precipitation
- 3.63 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 13 h 20 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 21
- Days at 80°F or more
- 10
- Sunshine
- 77%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014920; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in La Crosse in September?
On a given September day the chance of 0.01 inch or more is 31% on average, highest around September 21 (32%). In all, 3.63 in falls on 10 days of a normal September, 1 of them with an inch or more.
In a normal September in La Crosse, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014920.
How humid and windy is La Crosse in September?
At 3 p.m. the normal temperature is 66°F with 49% relative humidity and a dew point of 46°F; at 6 a.m. it is 51°F with 84% humidity. The wind averages 8.5 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. | 51°F | 46°F | 84% | 7.4 mph | 51% |
| 9 a.m. | 56°F | 47°F | 71% | 8.9 mph | 53% |
| noon | 64°F | 47°F | 55% | 10.5 mph | 54% |
| 3 p.m. | 66°F | 46°F | 49% | 10.8 mph | 53% |
| 6 p.m. | 61°F | 47°F | 61% | 7.9 mph | 57% |
| 9 p.m. | 56°F | 47°F | 73% | 7.6 mph | 64% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014920. 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 La Crosse?
The warmest September temperature on La Crosse's official record (since 1872) is 101°F, on September 6, 1922; the coldest is 24°F, on September 30, 1899. The wettest September brought 10.87 in (1881).
The September mean against the 1991-2020 normal of 64.8°F: 2021 67.2°F (+2.4), 2022 65.2°F (+0.4), 2023 68.6°F (+3.8), 2024 68.0°F (+3.2), 2025 66.8°F (+2.0), 2026 66.7°F (+1.9). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 67.2°F | +2.4°F | 1.43 in |
| 2022 | 65.2°F | +0.4°F | 1.66 in |
| 2023 | 68.6°F | +3.8°F | 2.26 in |
| 2024 | 68.0°F | +3.2°F | 1.94 in |
| 2025 | 66.8°F | +2.0°F | 3.72 in |
| 2026 | 66.7°F | +1.9°F | 7.01 in |
Source: records: ACIS, NWS threaded record LSEthr; recent months: ACIS, station USW00014920. Records and recent months use complete months only.
How does September in La Crosse compare across Wisconsin?
Across the 165 places PlainClimate covers in Wisconsin, September normal highs run from 64°F in Laona to 77°F in West Allis; La Crosse's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- La Crosse in August83°F by day, 62°F at night
- La Crosse in October62°F by day, 42°F at night
- La Crosse through the yearEvery month, frost dates, records and recent years
- Wisconsin in SeptemberThe statewide normal and the warmest and coolest places
- West Allis: Wisconsin's warmest Septembernormal high 77°F