Decatur weather in June: Decatur, Illinois: normal highs, lows, rain and records for June
Decatur in June has a normal high of 83°F and a normal low of 62°F, a daily mean of 73°F, rising from 80°F on the 1st to 86°F by the 30th. Measurable precipitation falls on 11 days in a normal June, 4.38 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 28°C and low of 17°C, 111 mm of precipitation in June.
- NOAA stationDecatur Airport
- Station IDUSW00003887
- Location39.83°N 88.87°W
- Elevation675 ft (206 m)
- From the center4 miles
- Population68,763
- Jan 35° 20°
- Feb 40° 23°
- Mar 52° 32°
- Apr 64° 42°
- May 74° 53°
- Jun 83° 62°
- Jul 86° 66°
- Aug 84° 63°
- Sep 79° 55°
- Oct 66° 44°
- Nov 51° 34°
- Dec 40° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Decatur in June?
The normal high is 83°F and the normal low 62°F, for a daily mean of 72.7°F. June is 8.8°F warmer than May and 3.0°F cooler than July. June is the 3rd warmest month of the year in Decatur and the wettest. Across the month the normal high rises 6°F, from 80°F on June 1 to 86°F on June 30. From one year to the next June's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Junes in three average between 71°F and 75°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 40%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| June 1 | 80°F | 59°F | 40% | 24% |
| June 8 | 82°F | 61°F | 39% | 23% |
| June 15 | 83°F | 63°F | 38% | 22% |
| June 22 | 85°F | 64°F | 37% | 22% |
| June 30 | 86°F | 65°F | 35% | 20% |
Every day of June: normal high, low and chance of precipitation (warmest afternoon June 30, coldest night June 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| June 1 | 80°F | 59°F | 40% | 24% | 14 h 50 min |
| June 2 | 80°F | 59°F | 40% | 23% | 14 h 50 min |
| June 3 | 80°F | 59°F | 40% | 23% | 14 h 50 min |
| June 4 | 80°F | 60°F | 40% | 23% | 14 h 50 min |
| June 5 | 81°F | 60°F | 40% | 23% | 14 h 50 min |
| June 6 | 81°F | 60°F | 39% | 23% | 14 h 50 min |
| June 7 | 81°F | 61°F | 39% | 23% | 14 h 50 min |
| June 8 | 82°F | 61°F | 39% | 23% | 14 h 50 min |
| June 9 | 82°F | 61°F | 39% | 23% | 14 h 50 min |
| June 10 | 82°F | 61°F | 39% | 23% | 15 h |
| June 11 | 82°F | 62°F | 39% | 23% | 15 h |
| June 12 | 83°F | 62°F | 39% | 23% | 15 h |
| June 13 | 83°F | 62°F | 39% | 22% | 15 h |
| June 14 | 83°F | 62°F | 38% | 22% | 15 h |
| June 15 | 83°F | 63°F | 38% | 22% | 15 h |
| June 16 | 83°F | 63°F | 38% | 22% | 15 h |
| June 17 | 84°F | 63°F | 38% | 22% | 15 h |
| June 18 | 84°F | 63°F | 38% | 22% | 15 h |
| June 19 | 84°F | 63°F | 38% | 22% | 15 h |
| June 20 | 84°F | 64°F | 38% | 22% | 15 h |
| June 21 | 84°F | 64°F | 37% | 22% | 15 h |
| June 22 | 85°F | 64°F | 37% | 22% | 15 h |
| June 23 | 85°F | 64°F | 37% | 22% | 15 h |
| June 24 | 85°F | 64°F | 37% | 22% | 15 h |
| June 25 | 85°F | 65°F | 36% | 21% | 15 h |
| June 26 | 85°F | 65°F | 36% | 21% | 15 h |
| June 27 | 85°F | 65°F | 36% | 21% | 15 h |
| June 28 | 85°F | 65°F | 36% | 21% | 15 h |
| June 29 | 85°F | 65°F | 35% | 21% | 15 h |
| June 30 | 86°F | 65°F | 35% | 20% | 15 h |
- Normal high
- 83°FJune average
- Normal low
- 62°FJune average
- Precipitation
- 4.38 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 6
- Daylight
- 14 h 50 min to 15 hJune 1 to June 30
- Days at 70°F or more
- 29
- Days at 80°F or more
- 23
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00003887; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Decatur in June?
On a given June day the chance of 0.01 inch or more is 38% on average, highest around June 1 (40%). In all, 4.38 in falls on 11 days of a normal June, 1 of them with an inch or more.
In a normal June in Decatur, 6 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00003887.
How humid and windy is Decatur in June?
At 3 p.m. the normal temperature is 84°F with 53% relative humidity and a dew point of 65°F; at 6 a.m. it is 69°F with 85% humidity. The wind averages 7.7 mph, most often from the southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 69°F | 64°F | 85% | 6.1 mph | 68% |
| 9 a.m. | 78°F | 65°F | 66% | 8.7 mph | 69% |
| noon | 82°F | 65°F | 56% | 9.5 mph | 61% |
| 3 p.m. | 84°F | 65°F | 53% | 10.1 mph | 59% |
| 6 p.m. | 81°F | 65°F | 59% | 8.8 mph | 69% |
| 9 p.m. | 73°F | 65°F | 76% | 6.1 mph | 77% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00003887. 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 June in Decatur?
The warmest June temperature on this station's record (since 2000) is 103°F, on June 29, 2012; the coldest is 37°F, on June 1, 2003. The wettest June brought 9.51 in (2010).
The June mean against the 1991-2020 normal of 72.7°F: 2021 75.2°F (+2.5), 2022 74.4°F (+1.7), 2023 72.0°F (−0.8), 2024 75.7°F (+3.0), 2025 76.5°F (+3.8), 2026 72.3°F (−0.4). 4 of 6 ran warmer than normal.
| June | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 75.2°F | +2.5°F | 6.46 in |
| 2022 | 74.4°F | +1.7°F | 0.84 in |
| 2023 | 72.0°F | −0.8°F | 1.64 in |
| 2024 | 75.7°F | +3.0°F | 2.00 in |
| 2025 | 76.5°F | +3.8°F | 4.28 in |
| 2026 | 72.3°F | −0.4°F | 7.63 in |
Source: records: ACIS, station USW00003887; recent months: ACIS, station USW00003887. Records and recent months use complete months only.
How does June in Decatur compare across Illinois?
Across the 144 places PlainClimate covers in Illinois, June normal highs run from 76°F in Waukegan to 87°F in Belleville; Decatur's is 83°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.