Belleville weather in October: Belleville, Illinois: normal highs, lows, rain and records for October
Belleville in October has a normal high of 73°F and a normal low of 47°F, a daily mean of 60°F, falling from 79°F on the 1st to 66°F by the 31st. Measurable precipitation falls on 8 days in a normal October, 3.12 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 8°C, 79 mm of precipitation in October.
- NOAA stationBelleville Siu Research
- Station IDUSW00013802
- Location38.52°N 89.85°W
- Elevation450 ft (137 m)
- From the center8 miles
- Population40,560
- Jan 43° 24°
- Feb 49° 28°
- Mar 59° 36°
- Apr 71° 46°
- May 79° 56°
- Jun 87° 65°
- Jul 90° 68°
- Aug 89° 65°
- Sep 83° 57°
- Oct 73° 47°
- Nov 58° 37°
- Dec 46° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Belleville in October?
The normal high is 73°F and the normal low 47°F, for a daily mean of 59.7°F. October is 10.4°F cooler than September and 12.2°F warmer than November. October is the 6th warmest month of the year in Belleville and the 9th wettest. Across the month the normal high falls 13°F, from 79°F on October 1 to 66°F on October 31. From one year to the next October's mean temperature typically moves about 2.3°F either way (NOAA's standard deviation), so roughly two Octobers in three average between 57°F and 62°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 29%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| October 1 | 79°F | 51°F | 23% | 15% |
| October 8 | 76°F | 49°F | 25% | 16% |
| October 15 | 73°F | 47°F | 27% | 18% |
| October 22 | 70°F | 45°F | 28% | 19% |
| October 31 | 66°F | 42°F | 28% | 20% |
Every day of October: normal high, low and chance of precipitation (warmest afternoon October 1, coldest night October 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| October 1 | 79°F | 51°F | 23% | 15% | 11 h 50 min |
| October 2 | 78°F | 51°F | 23% | 15% | 11 h 50 min |
| October 3 | 78°F | 51°F | 24% | 16% | 11 h 50 min |
| October 4 | 78°F | 50°F | 24% | 16% | 11 h 40 min |
| October 5 | 77°F | 50°F | 24% | 16% | 11 h 40 min |
| October 6 | 77°F | 50°F | 24% | 16% | 11 h 40 min |
| October 7 | 77°F | 50°F | 25% | 16% | 11 h 40 min |
| October 8 | 76°F | 49°F | 25% | 16% | 11 h 30 min |
| October 9 | 76°F | 49°F | 25% | 17% | 11 h 30 min |
| October 10 | 75°F | 49°F | 26% | 17% | 11 h 30 min |
| October 11 | 75°F | 48°F | 26% | 17% | 11 h 30 min |
| October 12 | 75°F | 48°F | 26% | 17% | 11 h 20 min |
| October 13 | 74°F | 48°F | 26% | 17% | 11 h 20 min |
| October 14 | 74°F | 47°F | 27% | 18% | 11 h 20 min |
| October 15 | 73°F | 47°F | 27% | 18% | 11 h 20 min |
| October 16 | 73°F | 47°F | 27% | 18% | 11 h 10 min |
| October 17 | 72°F | 46°F | 27% | 18% | 11 h 10 min |
| October 18 | 72°F | 46°F | 27% | 18% | 11 h 10 min |
| October 19 | 72°F | 46°F | 28% | 19% | 11 h 10 min |
| October 20 | 71°F | 46°F | 28% | 19% | 11 h |
| October 21 | 71°F | 45°F | 28% | 19% | 11 h |
| October 22 | 70°F | 45°F | 28% | 19% | 11 h |
| October 23 | 70°F | 45°F | 28% | 19% | 11 h |
| October 24 | 69°F | 44°F | 28% | 19% | 10 h 50 min |
| October 25 | 69°F | 44°F | 28% | 20% | 10 h 50 min |
| October 26 | 68°F | 44°F | 28% | 20% | 10 h 50 min |
| October 27 | 68°F | 43°F | 29% | 20% | 10 h 50 min |
| October 28 | 67°F | 43°F | 29% | 20% | 10 h 50 min |
| October 29 | 67°F | 43°F | 29% | 20% | 10 h 40 min |
| October 30 | 66°F | 42°F | 29% | 20% | 10 h 40 min |
| October 31 | 66°F | 42°F | 28% | 20% | 10 h 40 min |
- Normal high
- 73°FOctober average
- Normal low
- 47°FOctober average
- Precipitation
- 3.12 inmonth total
- Days with precipitation
- 80.01 inch or more
- Days at 90°F or more
- 1
- Nights at 32°F or colder
- 3
- Daylight
- 11 h 50 min to 10 h 40 minOctober 1 to October 31
- Days at 70°F or more
- 19
- Days at 80°F or more
- 9
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013802; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Belleville in October?
On a given October day the chance of 0.01 inch or more is 27% on average, highest around October 27 (29%). In all, 3.12 in falls on 8 days of a normal October, 1 of them with an inch or more.
In a normal October in Belleville, 1 days reach 90°F and 3 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013802.
How humid and windy is Belleville in October?
At 3 p.m. the normal temperature is 60°F with 50% relative humidity and a dew point of 41°F; at 6 a.m. it is 44°F with 85% humidity. The wind averages 7.4 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. | 44°F | 40°F | 85% | 5.7 mph | 56% |
| 9 a.m. | 51°F | 43°F | 72% | 8.9 mph | 52% |
| noon | 58°F | 42°F | 55% | 10.2 mph | 45% |
| 3 p.m. | 60°F | 41°F | 50% | 10.6 mph | 48% |
| 6 p.m. | 53°F | 41°F | 64% | 6.9 mph | 53% |
| 9 p.m. | 49°F | 41°F | 74% | 6.1 mph | 54% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013802. 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 October in Belleville?
The warmest October temperature on this station's record (since 1948) is 96°F, on October 1, 2019; the coldest is 19°F, on October 17, 2024. The wettest October brought 12.05 in (2009).
The October mean against the 1991-2020 normal of 59.7°F: 2021 62.2°F (+2.5), 2022 55.2°F (−4.5), 2023 58.2°F (−1.5), 2024 58.9°F (−0.8), 2025 63.1°F (+3.4). 2 of 5 ran warmer than normal.
| October | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 62.2°F | +2.5°F | 5.11 in |
| 2022 | 55.2°F | −4.5°F | 2.90 in |
| 2023 | 58.2°F | −1.5°F | 1.51 in |
| 2024 | 58.9°F | −0.8°F | 0.56 in |
| 2025 | 63.1°F | +3.4°F | – |
Source: records: ACIS, station USW00013802; recent months: ACIS, station USW00013802. Records and recent months use complete months only.
How does October in Belleville compare across Illinois?
Across the 144 places PlainClimate covers in Illinois, October normal highs run from 60°F in Barrington to 73°F in Anna; Belleville's is 73°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.