St. Augustine Weather Forecast 15 Days, Weather in St. Augustine Today
Current weather conditions and 15 day weather forecast for St. Augustine, Illinois, USA including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain risk, wind speed, cloud, pressure, and UV index.
Current weather conditions at St. Augustine
| 10 May 2026 Sunday 6 ° C / 42.8°F  Sunny |
Feels Like : 3.4 ° C / 38.2°F Humidity : % 63 Pressure : 1017 mb Wind Speed : 12.2 kmph / 7.6 miles from N  Visibility : 16 km Precipitation (rainfall) : 0 mm Cloud (%) : 0 |
15 day weather forecast for St. Augustine, IL, USA
Weather Forecast for next 15 Days for St. Augustine including weather warnings, temperature, rain, wind speed, cloud, snow, wind speed and wind direction, pressure and UV index.Here is weather for the next 15 days in St. Augustine, Illinois state, US. To see the daily forecast, scroll to the table below.
| Date | Weather forecast | Low temperature | High temperature | Avg. temperature | Humidity | Chance of rain | UV Index | Sun Position | Moon Position | |
|---|---|---|---|---|---|---|---|---|---|---|
| 10 May 2026 Sunday | Sunny |
7.1 ° C (44.8°F) |
21.9 ° C (71.4°F) |
14.1 ° C (57.3°F) |
% 41 | 0% | 7.1 | Sunrise:05:50 AM Sunset: 08:07 PM |
Moonrise:02:29 AM Moonset: 01:16 PM Moon Phase ( Waning Crescent ) |
|
| 11 May 2026 Monday |  Partly Cloudy |
6.8 ° C (44.2°F) |
19.5 ° C (67.2°F) |
13.6 ° C (56.4°F) |
% 62 | 0% | 7.6 | Sunrise:05:49 AM Sunset: 08:08 PM |
Moonrise:02:53 AM Moonset: 02:22 PM Moon Phase ( Waning Crescent ) |
|
| 12 May 2026 Tuesday |  Patchy rain nearby |
10.4 ° C (50.8°F) |
21.2 ° C (70.1°F) |
16.1 ° C (61°F) |
% 74 | 86% | 0.3 | Sunrise:05:48 AM Sunset: 08:09 PM |
Moonrise:03:15 AM Moonset: 03:31 PM Moon Phase ( Waning Crescent ) |
|
| 13 May 2026 Wednesday | Sunny |
9.1 ° C (48.4°F) |
19.1 ° C (66.3°F) |
14.6 ° C (58.3°F) |
% 65 | 0% | 4 | Sunrise:05:47 AM Sunset: 08:10 PM |
Moonrise:03:38 AM Moonset: 04:43 PM Moon Phase ( Waning Crescent ) |
|
| 14 May 2026 Thursday | Sunny |
7.5 ° C (45.6°F) |
22.1 ° C (71.7°F) |
14.4 ° C (57.8°F) |
% 67 | 0% | 4 | Sunrise:05:46 AM Sunset: 08:11 PM |
Moonrise:04:02 AM Moonset: 05:59 PM Moon Phase ( Waning Crescent ) |
|
| 15 May 2026 Friday | Partly Cloudy |
14.2 ° C (57.5°F) |
27.2 ° C (81°F) |
20.6 ° C (69.2°F) |
% 73 | 0% | 6 | Sunrise:05:45 AM Sunset: 08:12 PM |
Moonrise:04:31 AM Moonset: 07:19 PM Moon Phase ( Waning Crescent ) |
|
| 16 May 2026 Saturday | Patchy rain nearby |
18.5 ° C (65.2°F) |
29 ° C (84.2°F) |
23.1 ° C (73.6°F) |
% 73 | 80% | 5 | Sunrise:05:44 AM Sunset: 08:13 PM |
Moonrise:05:07 AM Moonset: 08:40 PM Moon Phase ( New Moon ) |
|
| 17 May 2026 Sunday |  Moderate rain |
18.7 ° C (65.7°F) |
28.8 ° C (83.8°F) |
23.3 ° C (73.9°F) |
% 73 | 83% | 5 | Sunrise:05:43 AM Sunset: 08:14 PM |
Moonrise:05:52 AM Moonset: 09:59 PM Moon Phase ( Waxing Crescent ) |
|
| 18 May 2026 Monday | Moderate rain |
15.1 ° C (59.1°F) |
21.9 ° C (71.4°F) |
19 ° C (66.2°F) |
% 82 | 87% | 4 | Sunrise:05:42 AM Sunset: 08:15 PM |
Moonrise:06:49 AM Moonset: 11:08 PM Moon Phase ( Waxing Crescent ) |
|
| 19 May 2026 Tuesday | Sunny |
12.7 ° C (54.9°F) |
24.5 ° C (76.1°F) |
18.3 ° C (65°F) |
% 62 | 0% | 5 | Sunrise:05:41 AM Sunset: 08:16 PM |
Moonrise:07:59 AM Moonset: No moonset Moon Phase ( Waxing Crescent ) |
|
| 20 May 2026 Wednesday | Moderate rain |
15.3 ° C (59.6°F) |
18.9 ° C (66.1°F) |
18.2 ° C (64.8°F) |
% 91 | 89% | 4 | Sunrise:05:41 AM Sunset: 08:17 PM |
Moonrise:09:15 AM Moonset: 12:04 AM Moon Phase ( Waxing Crescent ) |
|
| 21 May 2026 Thursday | Moderate rain |
17.3 ° C (63.2°F) |
23.8 ° C (74.8°F) |
20 ° C (68.1°F) |
% 88 | 76% | 5 | Sunrise:05:40 AM Sunset: 08:18 PM |
Moonrise:10:32 AM Moonset: 12:47 AM Moon Phase ( Waxing Crescent ) |
|
| 22 May 2026 Friday | Moderate rain |
18.8 ° C (65.9°F) |
28.7 ° C (83.6°F) |
23.4 ° C (74.1°F) |
% 87 | 82% | 5 | Sunrise:05:39 AM Sunset: 08:18 PM |
Moonrise:11:46 AM Moonset: 01:21 AM Moon Phase ( Waxing Crescent ) |
|
| 23 May 2026 Saturday | Moderate rain |
17.7 ° C (63.8°F) |
22 ° C (71.6°F) |
19.6 ° C (67.3°F) |
% 91 | 88% | 4 | Sunrise:05:38 AM Sunset: 08:19 PM |
Moonrise:12:56 PM Moonset: 01:48 AM Moon Phase ( First Quarter ) |
|
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