Climate Monmouth - Illinois
| JanJa | FebFe | MarMa | AprAp | MayMa | JunJu | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 33 | 38 | 51 | 65 | 74 | 83 |
| Average low in ºF Av. low Lo | 16 | 20 | 30 | 41 | 51 | 60 |
| Av. precipitation in inch Av. precip. Pre. | 1.66 | 1.87 | 2.75 | 3.92 | 4.75 | 4.36 |
| Av. snowfall in inch Snowfall Sn | 8 | 6 | 3 | 1 | 0 | 0 |
| JulJu | AugAu | SepSe | OctOc | NovNo | DecDe | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 86 | 84 | 78 | 66 | 51 | 36 |
| Average low in ºF Av. low Lo | 64 | 62 | 53 | 43 | 32 | 20 |
| Av. precipitation in inch Av. precip. Pre. | 4.21 | 4.07 | 3.54 | 3.06 | 2.82 | 2.37 |
| Av. snowfall in inch Snowfall Sn | 0 | 0 | 0 | 0 | 1 | 6 |
What is the average weather in Monmouth, Illinois?
Monmouth experiences a humid continental climate, marked by very strong seasonal temperature contrasts. Summers are warm and bring the wettest conditions, contributing to the area being fairly wet overall. Winters are cold and see regular snowfall, while the driest period occurs during the winter months.
Monmouth Climate Graph - Illinois Climate Chart
Daily normals Monmouth - Illinois - January
Day | High ºF | Low ºF | Prec/mo inch | Prec/yr inch | Snow/mo inch | Snow/yr inch |
|---|---|---|---|---|---|---|
| 1 Jan | 32.3 | 16.6 | 0.06 | 0.06 | 0.30 | 0.30 |
| 2 Jan | 32.2 | 16.4 | 0.12 | 0.12 | 0.50 | 0.50 |
| 3 Jan | 32.0 | 16.1 | 0.18 | 0.18 | 0.80 | 0.80 |
| 4 Jan | 31.9 | 15.9 | 0.25 | 0.25 | 1.00 | 1.00 |
| 5 Jan | 31.8 | 15.7 | 0.31 | 0.31 | 1.30 | 1.30 |
| 6 Jan | 31.6 | 15.5 | 0.37 | 0.37 | 1.60 | 1.60 |
| 7 Jan | 31.5 | 15.3 | 0.43 | 0.43 | 1.90 | 1.90 |
| 8 Jan | 31.4 | 15.2 | 0.49 | 0.49 | 2.20 | 2.20 |
| 9 Jan | 31.3 | 15.0 | 0.55 | 0.55 | 2.40 | 2.40 |
| 10 Jan | 31.3 | 14.8 | 0.62 | 0.62 | 2.70 | 2.70 |
| 11 Jan | 31.2 | 14.7 | 0.68 | 0.68 | 3.00 | 3.00 |
| 12 Jan | 31.1 | 14.6 | 0.74 | 0.74 | 3.30 | 3.30 |
| 13 Jan | 31.1 | 14.4 | 0.80 | 0.80 | 3.70 | 3.70 |
| 14 Jan | 31.0 | 14.3 | 0.86 | 0.86 | 4.00 | 4.00 |
| 15 Jan | 31.0 | 14.2 | 0.93 | 0.93 | 4.30 | 4.30 |
| 16 Jan | 31.0 | 14.2 | 0.99 | 0.99 | 4.60 | 4.60 |
| 17 Jan | 31.0 | 14.1 | 1.05 | 1.05 | 4.90 | 4.90 |
| 18 Jan | 31.0 | 14.0 | 1.11 | 1.11 | 5.20 | 5.20 |
| 19 Jan | 31.0 | 14.0 | 1.17 | 1.17 | 5.50 | 5.50 |
| 20 Jan | 31.0 | 14.0 | 1.23 | 1.23 | 5.80 | 5.80 |
| 21 Jan | 31.0 | 14.0 | 1.28 | 1.28 | 6.10 | 6.10 |
| 22 Jan | 31.1 | 14.0 | 1.34 | 1.34 | 6.40 | 6.40 |
| 23 Jan | 31.1 | 14.0 | 1.40 | 1.40 | 6.60 | 6.60 |
| 24 Jan | 31.2 | 14.0 | 1.46 | 1.46 | 6.90 | 6.90 |
| 25 Jan | 31.3 | 14.1 | 1.52 | 1.52 | 7.20 | 7.20 |
| 26 Jan | 31.4 | 14.1 | 1.57 | 1.57 | 7.40 | 7.40 |
| 27 Jan | 31.5 | 14.2 | 1.63 | 1.63 | 7.70 | 7.70 |
| 28 Jan | 31.6 | 14.3 | 1.68 | 1.68 | 7.90 | 7.90 |
| 29 Jan | 31.7 | 14.5 | 1.74 | 1.74 | 8.20 | 8.20 |
| 30 Jan | 31.9 | 14.6 | 1.79 | 1.79 | 8.50 | 8.50 |
| 31 Jan | 32.0 | 14.7 | 1.85 | 1.85 | 8.70 | 8.70 |
Weather history Monmouth - August 2026
| Day | High ºF | Low ºF | Precip. inch | Snow inch | Snow d. inch |
|---|---|---|---|---|---|
| 01 Aug | 80.1 | 66.9 | 2.11 | 0.00 | 0.0 |
| 02 Aug | 70.0 | 62.1 | 0.85 | 0.00 | 0.0 |
| 03 Aug | 79.0 | 60.1 | 0.00 | 0.00 | 0.0 |
| 04 Aug | 82.0 | 60.1 | 0.00 | 0.00 | 0.0 |
| 05 Aug | 87.1 | 69.1 | 0.11 | 0.00 | 0.0 |
| 06 Aug | 73.9 | 66.9 | 0.36 | 0.00 | 0.0 |
| 07 Aug | 80.1 | 66.0 | 0.00 | 0.00 | 0.0 |
| 08 Aug | 80.1 | 66.0 | 0.00 | 0.00 | 0.0 |
| 09 Aug | 80.1 | 66.0 | 0.00 | 0.00 | 0.0 |
| 10 Aug | 80.1 | 66.0 | 0.00 | 0.00 | 0.0 |
| 11 Aug | 88.0 | 73.9 | 0.00 | 0.00 | 0.0 |
| 12 Aug | 89.1 | 73.9 | 0.00 | 0.00 | 0.0 |
| 13 Aug | 82.9 | 68.0 | 2.21 | 0.00 | 0.0 |
| 14 Aug | 80.1 | 70.0 | 3.05 | 0.00 | 0.0 |
| 15 Aug | 80.1 | 70.0 | 2.63 | 0.00 | 0.0 |
| 16 Aug | 87.1 | 73.0 | 0.57 | 0.00 | 0.0 |
| 17 Aug | 87.1 | 64.0 | 0.02 | 0.00 | 0.0 |
| 18 Aug | 81.0 | 64.9 | 0.00 | 0.00 | 0.0 |
| 19 Aug | 81.0 | 66.9 | 0.00 | 0.00 | 0.0 |
| 20 Aug | 84.0 | 64.0 | 0.08 | 0.00 | 0.0 |
| 21 Aug | 81.0 | 62.1 | 0.00 | 0.00 | 0.0 |
| 22 Aug | 84.0 | 64.0 | 0.00 | 0.00 | 0.0 |
| 23 Aug | 82.9 | 57.9 | 0.00 | 0.00 | 0.0 |
| 24 Aug | 77.0 | 54.0 | 0.00 | 0.00 | 0.0 |
| 25 Aug | 80.1 | 57.0 | 0.00 | 0.00 | 0.0 |
| 26 Aug | 82.0 | 61.0 | 0.00 | 0.00 | 0.0 |
| 27 Aug | 84.0 | 59.0 | 0.00 | 0.00 | 0.0 |
| 28 Aug | 82.0 | 59.0 | 0.00 | 0.00 | 0.0 |
| 29 Aug | 84.0 | 63.0 | 0.00 | 0.00 | 0.0 |
| 30 Aug | 78.1 | 68.0 | 0.09 | 0.00 | 0.0 |
| 31 Aug | 84.9 | 72.0 | 0.02 | 0.00 | 0.0 |
Past weather Monmouth
| Aug 26 | Normal | ||
|---|---|---|---|
| Average high temperature Av. high temp. | 81.7 ºF | 84 ºF | |
| Average low temperature Av. low temp. | 65.0 ºF | 62 ºF | |
| Total precipitation Total precip. | 12.10 inch | 4.07 inch | |
| Total snowfall Total snowfall | 0.00 inch | 0 inch | |
| Highest max temperature Highest max temp. | 89.1 ºF | - | |
| Lowest max temperature Lowest max temp. | 70.0 ºF | - | |
| Highest min temperature Highest min temp. | 73.9 ºF | - | |
| Lowest min temperature Lowest min temp. | 54.0 ºF | - | |
Past weather August 2026 incomplete - Missing data
Geo Monmouth - Illinois
| Country | United States | |
|---|---|---|
| State | Illinois | |
| County | Warren | |
| City | Monmouth | |
| Zip Code | 61462 | |
| Longitude | -90.63 dec. degr. | |
| Latitude | 40.93 dec. degr. | |
| Altitude - Elevation | 748ft | |
| ICAO | - | |
| IATA | - |
Date and Time Monmouth - Illinois
| Local Time | 03:28 PM | |
|---|---|---|
| Sunrise | 07:06 AM | |
| Sunset | 06:33 PM | |
| Day/Night | Day | |
| Timezone | Central Daylight Time | |
| Timezone DB | America - Chicago |
Map of Monmouth - Illinois
USGS National Map — Open interactive map
Monmouth weather averages
| Annual high temperature | 62ºF |
| Annual low temperature | 41ºF |
| Average annual precip. | 39.38 inch |
| Av. annual snowfall | 25 inch |
Station Data
Monthly averages Monmouth
Longitude: -90.6311, Latitude: 40.9297
Average weather Monmouth, IL - 61462
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, ...