St. Charles in Spring
In spring (March, April and May), St. Charles sees average daytime highs around 65°F and overnight lows near 49°F, with 10.5 in of precipitation over about 30 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Over the season highs climb from about 51°F in early March to 78°F by late May. The sky is clear or mostly clear about 30% of the time across spring, and the air most often feels dry.
Spring is St. Charles's 2nd-best season to visit on our travel score. For the whole year in context, see St. Charles's year-round climate.
- Avg daytime high
- 65°F
- 3rd-warmest season
- Avg overnight low
- 49°F
- Precipitation
- 10.5 in
- 30 wet days
- Avg wind
- 7 mph
- Travel score
- 5.4
- 2nd-best season
- Months
- Mar · Apr · May
Temperature in St. Charles in Spring
Over the season highs climb from about 51°F in early March to 78°F by late May.
A typical spring day in St. Charles reaches about 65°F and drops to 49°F overnight. The warmest of the three months is May, the coolest March.
How spring really feels in St. Charles
Once humidity and wind are folded in, spring brings about 0 days that feel above 90°F and 10 that feel at or below 32°F.
The story in spring is cold — wind chill drags the overnight "feels like" below the raw low.
St. Charles weather by month
How the three spring months (March, April and May) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 44° / 31° | 3.0 | 8.7 | 2.7 | 9.6 | 0.7 |
| Feb | 47° / 32° | 2.8 | 8.4 | 2.2 | 10.5 | 1.4 |
| Mar | 55° / 39° | 3.9 | 10.1 | 1.5 | 11.7 | 3.5 |
| Apr | 66° / 50° | 3.3 | 9.4 | 0 | 13 | 6.0 |
| May | 74° / 59° | 3.4 | 10.4 | 0 | 14.1 | 6.7 |
| Jun | 83° / 68° | 3.5 | 10.9 | 0 | 14.6 | 5.7 |
| Jul | 87° / 73° | 3.8 | 12 | 0 | 14.4 | 4.6 |
| Aug | 85° / 71° | 3.7 | 10.2 | 0 | 13.5 | 5.4 |
| Sep | 78° / 64° | 4.1 | 9.2 | 0 | 12.3 | 6.9 |
| Oct | 67° / 53° | 3.4 | 7.7 | 0 | 11 | 6.6 |
| Nov | 56° / 42° | 2.9 | 7.4 | 0.1 | 9.9 | 4.2 |
| Dec | 48° / 35° | 3.3 | 8.7 | 1.2 | 9.4 | 1.8 |
Cloud cover in Spring
The sky is clear or mostly clear about 30% of the time across spring.
Chance of precipitation in Spring
St. Charles gets around 10.5 in of rain and snow over 30 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 7 mph across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 06 min in early March to 14 h 30 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 5.0 kWh/m².
Hazard calendar for St. Charles
None of St. Charles's seasonal hazards peak in spring. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do.
St. Charles sits in the Atlantic hurricane belt; the season peaks August–October.
Is spring a good time to visit St. Charles?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is a reasonable time to visit St. Charles for sightseeing.
What to pack for St. Charles in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, St. Charles sees daytime highs around 65°F and nights near 49°F. Worth packing: light clothes, a warm layer, rain gear and sun protection. About 30 days see rain.
Sea temperature near St. Charles in Spring
The nearest coast averages about 48°F across spring — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 30 mi away) is warmest in August at about 78°F and coldest in February near 37°F.
It's comfortable for a long swim from Jun 16 to Oct 6 — about 3.7 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 38 | 37 | 40 | 47 | 57 | 68 | 76 | 78 | 74 | 65 | 54 | 45 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Refreshing | Warm | Warm | Refreshing | Cool | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 38 | Bracing |
| Feb | 37 | Bracing |
| Mar | 40 | Bracing |
| Apr | 47 | Bracing |
| May | 57 | Bracing |
| Jun | 68 | Refreshing |
| Jul | 76 | Warm |
| Aug | 78 | Warm |
| Sep | 74 | Refreshing |
| Oct | 65 | Cool |
| Nov | 54 | Bracing |
| Dec | 45 | Bracing |
UV index in St. Charles in Spring
Clear-sky midday UV across spring averages around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in St. Charles peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 7 | 6 | 4 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | High | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 7 | High |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in St. Charles in Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring falls, not just the annual average.
Air quality in St. Charles is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 7 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 9 | 10 | 12 | 13 | 14 | 15 | 16 | 14 | 11 | 8 | 7 | 8 |
| Level | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 10 | Good |
| Mar | 12 | Good |
| Apr | 13 | Moderate |
| May | 14 | Moderate |
| Jun | 15 | Moderate |
| Jul | 16 | Moderate |
| Aug | 14 | Moderate |
| Sep | 11 | Good |
| Oct | 8 | Good |
| Nov | 7 | Good |
| Dec | 8 | Good |
Where is St. Charles?
St. Charles sits at 38.6°N, 76.9°W, 207 ft above sea level, in United States. The nearest listed city is Saint Charles, 0.6 mi away.
Topography around St. Charles
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of St. Charles.
Within 2 miles, the terrain around St. Charles has only modest variations in elevation — a maximum elevation change of 82 ft around an average of 213 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 315 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,539 ft.
The land around St. Charles is covered by trees (58%) and artificial surfaces (30%) within 2 miles, trees (77%) within 10 miles, and trees (59%) and water (21%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for St. Charles (38.6073°, -76.9248°, elevation 207 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.