Monroe weather in September: Monroe, Louisiana: normal highs, lows, rain and records for September
Monroe in September has a normal high of 89°F and a normal low of 66°F, a daily mean of 77°F, falling from 92°F on the 1st to 85°F by the 30th. Measurable precipitation falls on 7 days in a normal September, 3.55 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 19°C, 90 mm of precipitation in September.
- NOAA stationMonroe Regional Airport
- Station IDUSW00013942
- Location32.52°N 92.04°W
- Elevation79 ft (24 m)
- From the center2 miles
- Population46,622
- Jan 57° 37°
- Feb 61° 40°
- Mar 69° 47°
- Apr 77° 54°
- May 84° 63°
- Jun 91° 70°
- Jul 93° 73°
- Aug 94° 71°
- Sep 89° 66°
- Oct 79° 54°
- Nov 67° 44°
- Dec 59° 39°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Monroe in September?
The normal high is 89°F and the normal low 66°F, for a daily mean of 77.1°F. September is 5.4°F cooler than August and 10.8°F warmer than October. September is the 4th warmest month of the year in Monroe and the 12th wettest. Across the month the normal high falls 7°F, from 92°F on September 1 to 85°F on September 30. From one year to the next September's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 75°F and 80°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 24%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 92°F | 70°F | 24% | 15% |
| September 8 | 91°F | 68°F | 23% | 14% |
| September 15 | 89°F | 66°F | 23% | 14% |
| September 22 | 87°F | 64°F | 23% | 13% |
| September 30 | 85°F | 60°F | 22% | 14% |
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 | 92°F | 70°F | 24% | 15% | 12 h 50 min |
| September 2 | 92°F | 69°F | 24% | 15% | 12 h 50 min |
| September 3 | 92°F | 69°F | 24% | 14% | 12 h 50 min |
| September 4 | 91°F | 69°F | 24% | 14% | 12 h 50 min |
| September 5 | 91°F | 69°F | 24% | 14% | 12 h 40 min |
| September 6 | 91°F | 69°F | 24% | 14% | 12 h 40 min |
| September 7 | 91°F | 68°F | 23% | 14% | 12 h 40 min |
| September 8 | 91°F | 68°F | 23% | 14% | 12 h 40 min |
| September 9 | 90°F | 68°F | 23% | 14% | 12 h 40 min |
| September 10 | 90°F | 68°F | 23% | 14% | 12 h 30 min |
| September 11 | 90°F | 67°F | 23% | 14% | 12 h 30 min |
| September 12 | 90°F | 67°F | 23% | 14% | 12 h 30 min |
| September 13 | 90°F | 67°F | 23% | 14% | 12 h 30 min |
| September 14 | 89°F | 66°F | 23% | 14% | 12 h 30 min |
| September 15 | 89°F | 66°F | 23% | 14% | 12 h 20 min |
| September 16 | 89°F | 66°F | 23% | 13% | 12 h 20 min |
| September 17 | 89°F | 65°F | 23% | 13% | 12 h 20 min |
| September 18 | 88°F | 65°F | 23% | 13% | 12 h 20 min |
| September 19 | 88°F | 65°F | 23% | 13% | 12 h 20 min |
| September 20 | 88°F | 64°F | 23% | 13% | 12 h 20 min |
| September 21 | 88°F | 64°F | 23% | 13% | 12 h 10 min |
| September 22 | 87°F | 64°F | 23% | 13% | 12 h 10 min |
| September 23 | 87°F | 63°F | 23% | 13% | 12 h 10 min |
| September 24 | 87°F | 63°F | 23% | 14% | 12 h 10 min |
| September 25 | 86°F | 62°F | 23% | 13% | 12 h 10 min |
| September 26 | 86°F | 62°F | 22% | 13% | 12 h |
| September 27 | 86°F | 62°F | 22% | 13% | 12 h |
| September 28 | 85°F | 61°F | 22% | 13% | 12 h |
| September 29 | 85°F | 61°F | 22% | 13% | 12 h |
| September 30 | 85°F | 60°F | 22% | 14% | 12 h |
- Normal high
- 89°FSeptember average
- Normal low
- 66°FSeptember average
- Precipitation
- 3.55 inmonth total
- Days with precipitation
- 70.01 inch or more
- Days at 90°F or more
- 15
- Daylight
- 12 h 50 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 27
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013942; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Monroe in September?
On a given September day the chance of 0.01 inch or more is 23% on average, highest around September 1 (24%). In all, 3.55 in falls on 7 days of a normal September, 1 of them with an inch or more.
In a normal September in Monroe, 15 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013942.
How humid and windy is Monroe in September?
At 3 p.m. the normal temperature is 83°F with 44% relative humidity and a dew point of 59°F; at 6 a.m. it is 62°F with 90% humidity. The wind averages 5.3 mph, most often from the north-northeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 62°F | 59°F | 90% | 3.7 mph | 76% |
| 9 a.m. | 73°F | 62°F | 68% | 6.8 mph | 75% |
| noon | 81°F | 60°F | 49% | 8.1 mph | 71% |
| 3 p.m. | 83°F | 59°F | 44% | 8.0 mph | 70% |
| 6 p.m. | 76°F | 62°F | 62% | 4.4 mph | 81% |
| 9 p.m. | 69°F | 61°F | 78% | 3.6 mph | 82% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013942. 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 Monroe?
The warmest September temperature on Monroe's official record (since 1893) is 107°F, on September 1, 2000; the coldest is 35°F, on September 29, 1967. The wettest September brought 12.93 in (1913).
The September mean against the 1991-2020 normal of 77.1°F: 2021 77.0°F (−0.1), 2022 78.0°F (+0.9), 2023 80.3°F (+3.2), 2024 77.5°F (+0.4), 2025 79.7°F (+2.6), 2026 83.5°F (+6.4). 5 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 77.0°F | −0.1°F | 1.72 in |
| 2022 | 78.0°F | +0.9°F | 0.68 in |
| 2023 | 80.3°F | +3.2°F | 2.18 in |
| 2024 | 77.5°F | +0.4°F | 4.06 in |
| 2025 | 79.7°F | +2.6°F | 2.37 in |
| 2026 | 83.5°F | +6.4°F | 0.37 in |
Source: records: ACIS, NWS threaded record MLUthr; recent months: ACIS, station USW00013942. Records and recent months use complete months only.
How does September in Monroe compare across Louisiana?
Across the 65 places PlainClimate covers in Louisiana, September normal highs run from 85°F in Boyce to 90°F in Natchitoches; Monroe's is 89°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.