Climate Harrisburg - Illinois
| JanJa | FebFe | MarMa | AprAp | MayMa | JunJu | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 42 | 47 | 57 | 69 | 77 | 85 |
| Average low in ºF Av. low Lo | 23 | 27 | 35 | 45 | 55 | 64 |
| Av. precipitation in inch Av. precip. Pre. | 3.42 | 3.42 | 4.67 | 4.43 | 5.07 | 4.46 |
| Av. snowfall in inch Snowfall Sn | 1 | 2 | 1 | 0 | 0 | 0 |
| JulJu | AugAu | SepSe | OctOc | NovNo | DecDe | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 89 | 88 | 82 | 71 | 58 | 45 |
| Average low in ºF Av. low Lo | 67 | 65 | 56 | 44 | 36 | 26 |
| Av. precipitation in inch Av. precip. Pre. | 3.75 | 3.00 | 3.05 | 3.75 | 4.50 | 3.94 |
| Av. snowfall in inch Snowfall Sn | 0 | 0 | 0 | 0 | 0 | 1 |
What is the average weather in Harrisburg, Illinois?
Harrisburg experiences a humid subtropical climate, marked by very large seasonal temperature contrasts. Summers are hot, while winters are cold and bring occasional snowfall. The area is fairly wet, with rainfall spread fairly evenly throughout the year, though spring is typically the wettest season. Heavy seasonal downpours or afternoon thunderstorms can sometimes occur during the warmer months.
Harrisburg Climate Graph - Illinois Climate Chart
Daily normals Harrisburg - Illinois - January
Day | High ºF | Low ºF | Prec/mo inch | Prec/yr inch | Snow/mo inch | Snow/yr inch |
|---|---|---|---|---|---|---|
| 1 Jan | 41.6 | 23.3 | 0.16 | 0.16 | 0.00 | 0.00 |
| 2 Jan | 41.5 | 23.2 | 0.28 | 0.28 | 0.12 | 0.30 |
| 3 Jan | 41.4 | 23.1 | 0.39 | 0.39 | 0.12 | 0.30 |
| 4 Jan | 41.3 | 23.1 | 0.55 | 0.55 | 0.12 | 0.30 |
| 5 Jan | 41.3 | 23.0 | 0.67 | 0.67 | 0.20 | 0.50 |
| 6 Jan | 41.3 | 23.0 | 0.83 | 0.83 | 0.20 | 0.50 |
| 7 Jan | 41.2 | 22.9 | 0.94 | 0.94 | 0.20 | 0.50 |
| 8 Jan | 41.2 | 22.9 | 1.06 | 1.06 | 0.31 | 0.80 |
| 9 Jan | 41.2 | 22.9 | 1.18 | 1.18 | 0.31 | 0.80 |
| 10 Jan | 41.2 | 22.8 | 1.30 | 1.30 | 0.39 | 1.00 |
| 11 Jan | 41.2 | 22.8 | 1.42 | 1.42 | 0.39 | 1.00 |
| 12 Jan | 41.2 | 22.8 | 1.54 | 1.54 | 0.39 | 1.00 |
| 13 Jan | 41.2 | 22.8 | 1.65 | 1.65 | 0.51 | 1.30 |
| 14 Jan | 41.3 | 22.9 | 1.77 | 1.77 | 0.51 | 1.30 |
| 15 Jan | 41.3 | 22.9 | 1.89 | 1.89 | 0.59 | 1.50 |
| 16 Jan | 41.3 | 22.9 | 2.01 | 2.01 | 0.59 | 1.50 |
| 17 Jan | 41.4 | 22.9 | 2.13 | 2.13 | 0.59 | 1.50 |
| 18 Jan | 41.5 | 23.0 | 2.24 | 2.24 | 0.71 | 1.80 |
| 19 Jan | 41.5 | 23.0 | 2.32 | 2.32 | 0.71 | 1.80 |
| 20 Jan | 41.6 | 23.1 | 2.44 | 2.44 | 0.79 | 2.00 |
| 21 Jan | 41.7 | 23.2 | 2.56 | 2.56 | 0.79 | 2.00 |
| 22 Jan | 41.8 | 23.2 | 2.64 | 2.64 | 0.91 | 2.30 |
| 23 Jan | 41.9 | 23.3 | 2.72 | 2.72 | 0.91 | 2.30 |
| 24 Jan | 42.1 | 23.4 | 2.80 | 2.80 | 0.98 | 2.50 |
| 25 Jan | 42.2 | 23.5 | 2.87 | 2.87 | 0.98 | 2.50 |
| 26 Jan | 42.3 | 23.6 | 2.99 | 2.99 | 1.10 | 2.80 |
| 27 Jan | 42.5 | 23.7 | 3.07 | 3.07 | 1.10 | 2.80 |
| 28 Jan | 42.6 | 23.8 | 3.15 | 3.15 | 1.18 | 3.00 |
| 29 Jan | 42.8 | 23.9 | 3.23 | 3.23 | 1.18 | 3.00 |
| 30 Jan | 43.0 | 24.0 | 3.35 | 3.35 | 1.30 | 3.30 |
| 31 Jan | 43.2 | 24.2 | 3.43 | 3.43 | 1.30 | 3.30 |
Weather history Harrisburg - May 2026
| Day | High ºF | Low ºF | Precip. inch | Snow inch | Snow d. inch |
|---|---|---|---|---|---|
| 01 May | 64.9 | 41.0 | 0.00 | 0.00 | 0.0 |
| 02 May | 62.1 | 42.1 | 0.00 | 0.00 | 0.0 |
| 03 May | 59.0 | 36.0 | 0.00 | 0.00 | 0.0 |
| 04 May | 70.0 | 36.0 | 0.00 | 0.00 | 0.0 |
| 05 May | 82.0 | 55.0 | 0.00 | 0.00 | 0.0 |
| 06 May | 64.0 | 44.1 | 0.70 | 0.00 | 0.0 |
| 07 May | 61.0 | 39.0 | 0.00 | 0.00 | 0.0 |
| 08 May | 64.9 | 39.0 | 0.00 | 0.00 | 0.0 |
| 09 May | 73.9 | 45.0 | - | 0.00 | 0.0 |
| 10 May | 79.0 | 52.0 | 0.00 | 0.00 | 0.0 |
| 11 May | 73.0 | 46.0 | 0.15 | 0.00 | 0.0 |
| 12 May | 75.9 | 46.0 | 0.00 | 0.00 | 0.0 |
| 13 May | 80.1 | 46.9 | 0.00 | 0.00 | 0.0 |
| 14 May | 75.0 | 46.9 | 0.00 | 0.00 | 0.0 |
| 15 May | 72.0 | 45.0 | 0.00 | 0.00 | 0.0 |
| 16 May | 81.0 | 53.1 | 0.00 | 0.00 | 0.0 |
| 17 May | 80.1 | 70.0 | - | 0.00 | 0.0 |
| 18 May | 86.0 | 69.1 | 0.00 | 0.00 | 0.0 |
| 19 May | 87.1 | 64.0 | 0.00 | 0.00 | 0.0 |
| 20 May | 87.1 | 63.0 | - | 0.00 | 0.0 |
| 21 May | 66.9 | 59.0 | - | 0.00 | 0.0 |
| 22 May | 64.9 | 57.9 | 0.00 | 0.00 | 0.0 |
| 23 May | 64.9 | 60.1 | - | 0.00 | 0.0 |
| 24 May | 72.0 | 61.0 | 0.00 | 0.00 | 0.0 |
| 25 May | 78.1 | 61.0 | 0.26 | 0.00 | 0.0 |
| 26 May | 77.0 | 59.0 | 0.00 | 0.00 | 0.0 |
| 27 May | 73.9 | 66.9 | - | 0.00 | 0.0 |
| 28 May | 73.9 | 66.0 | 0.00 | 0.00 | 0.0 |
| 29 May | 84.9 | 64.0 | 0.00 | 0.00 | 0.0 |
| 30 May | 79.0 | 64.0 | 0.00 | 0.00 | 0.0 |
| 31 May | 84.0 | 64.0 | 0.00 | 0.00 | 0.0 |
Past weather Harrisburg
| May 26 | Normal | ||
|---|---|---|---|
| Average high temperature Av. high temp. | 74.1 ºF | 42 ºF | |
| Average low temperature Av. low temp. | 53.6 ºF | 23 ºF | |
| Total precipitation Total precip. | 1.11 inch | 3.42 inch | |
| Total snowfall Total snowfall | 0.00 inch | 1 inch | |
| Highest max temperature Highest max temp. | 87.1 ºF | - | |
| Lowest max temperature Lowest max temp. | 59.0 ºF | - | |
| Highest min temperature Highest min temp. | 70.0 ºF | - | |
| Lowest min temperature Lowest min temp. | 36.0 ºF | - | |
Past weather May 2026 incomplete - Missing data
Geo Harrisburg - Illinois
| Country | United States | |
|---|---|---|
| State | Illinois | |
| County | Saline | |
| City | Harrisburg | |
| Zip Code | 62977 | |
| Longitude | -88.55 dec. degr. | |
| Latitude | 37.81 dec. degr. | |
| Altitude - Elevation | 381ft | |
| ICAO | - | |
| IATA | - |
Date and Time Harrisburg - Illinois
| Local Time | 12:28 PM | |
|---|---|---|
| Sunrise | 05:36 AM | |
| Sunset | 08:21 PM | |
| Day/Night | Day | |
| Timezone | Central Daylight Time | |
| Timezone DB | America - Chicago |
Map of Harrisburg - Illinois
USGS National Map — Open interactive map
Harrisburg weather averages
| Annual high temperature | 67ºF |
| Annual low temperature | 45ºF |
| Average annual precip. | 47.46 inch |
| Av. annual snowfall | 5 inch |
Station Data
Monthly averages Harrisburg
Longitude: -88.5503, Latitude: 37.8113
Average weather Harrisburg, IL - 62977
Monthly: 1991-2020 normals
History: 2007-2026
Abbreviations
Average precipitation in : Av. precipitation in
Jan: January, Feb: February, ...Jan: January, Feb: February, ...Ja: January, Fe: February, ...