Heilbron in Spring
In spring (September, October and November), Heilbron sees average daytime highs around 26°C and overnight lows near 12°C, with 194 mm of rain over about 26 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs climb from about 23°C in early September to 26°C by late November. The sky is clear or mostly clear about 56% of the time across spring, and the air most often feels dry.
Spring is Heilbron's 3rd-best season to visit on our travel score. For the whole year in context, see Heilbron's year-round climate.
- Avg daytime high
- 26°C
- 2nd-warmest season
- Avg overnight low
- 12°C
- Rainfall
- 194 mm
- 26 wet days
- Avg wind
- 13 km/h
- Travel score
- 7.4
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Heilbron in Spring
Over the season highs climb from about 23°C in early September to 26°C by late November.
A typical spring day in Heilbron reaches about 26°C and drops to 12°C overnight. The warmest of the three months is November, the coolest September.
How spring really feels in Heilbron
Once humidity and wind are folded in, spring brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
spring sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Heilbron weather by month
How the three spring months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 27° / 16° | 124 | 15 | 13.5 | 5.9 |
| Feb | 27° / 16° | 87 | 12.6 | 13 | 6.2 |
| Mar | 25° / 14° | 81 | 11.1 | 12.2 | 6.9 |
| Apr | 23° / 11° | 43 | 6.9 | 11.4 | 7.7 |
| May | 21° / 7° | 19 | 3.1 | 10.7 | 8.1 |
| Jun | 18° / 3° | 10 | 1.7 | 10.3 | 7.8 |
| Jul | 18° / 3° | 6 | 1.1 | 10.5 | 7.9 |
| Aug | 21° / 6° | 15 | 2.4 | 11 | 8.4 |
| Sep | 25° / 10° | 20 | 3.2 | 11.8 | 8.6 |
| Oct | 26° / 13° | 76 | 9.8 | 12.7 | 7.1 |
| Nov | 26° / 14° | 98 | 12.5 | 13.3 | 6.4 |
| Dec | 27° / 15° | 139 | 16.6 | 13.7 | 5.8 |
Cloud cover in Spring
The sky is clear or mostly clear about 56% of the time across spring.
Chance of precipitation in Spring
Heilbron gets around 194 mm of rain over 26 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 13 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 24 min in early September to 13 h 36 min by late November. 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 6.5 kWh/m².
Hazard calendar for Heilbron
In spring, Heilbron overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Heilbron's rainy season runs October–March, when most of the year's rain falls.
Is spring a good time to visit Heilbron?
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 one of the better times to visit Heilbron for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Heilbron in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Heilbron sees daytime highs around 26°C and nights near 12°C. Pack sun protection. Worth having: light clothes and rain gear. About 26 days see rain.
UV index in Heilbron in Spring
Clear-sky midday UV across spring averages around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Heilbron peaks around January 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 5 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 15 | 13 | 11 | 8 | 6 | 5 | 5 | 7 | 9 | 10 | 12 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | Moderate | High | Very high | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 13 | Extreme |
| Mar | 11 | Extreme |
| Apr | 8 | Very high |
| May | 6 | High |
| Jun | 5 | Moderate |
| Jul | 5 | High |
| Aug | 7 | Very high |
| Sep | 9 | Very high |
| Oct | 10 | Extreme |
| Nov | 12 | Extreme |
| Dec | 14 | Extreme |
Air quality in Heilbron 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 Heilbron is worst in July — around 103 µg/m³ PM2.5 (unhealthy), about 4.4× the cleanest month (January, 24 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) | 24 | 32 | 48 | 64 | 88 | 100 | 103 | 83 | 65 | 44 | 31 | 25 |
| Level | Moderate | Moderate | Poor | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Poor | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 24 | Moderate |
| Feb | 32 | Moderate |
| Mar | 48 | Poor |
| Apr | 64 | Unhealthy |
| May | 88 | Unhealthy |
| Jun | 100 | Unhealthy |
| Jul | 103 | Unhealthy |
| Aug | 83 | Unhealthy |
| Sep | 65 | Unhealthy |
| Oct | 44 | Poor |
| Nov | 31 | Moderate |
| Dec | 25 | Moderate |
Where is Heilbron?
Heilbron sits at 27.3°S, 28.0°E, 1,539 m above sea level, in South Africa. The nearest listed city is Koppies, 39 km away.
Topography around Heilbron
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Heilbron.
Within 3 km, the terrain around Heilbron has only modest variations in elevation — a maximum elevation change of 83 m around an average of 1,555 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 268 m; within 80 km, significant variations in elevation — a maximum elevation change of 455 m.
The land around Heilbron is covered by grassland (56%) and cropland (22%) within 3 km, grassland (51%) and cropland (47%) within 16 km, and grassland (56%) and cropland (40%) within 80 km.
South Africa travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / M / N
- 230 V · 50 Hz
- Prices
- ≈ 41% of US
- price level, 2025
- GDP per capita
- $6,598
- 2025
- Happiness
- 5.0 / 10
- World Happiness, 2025
- Safe drinking water
- 68%
- of population, 2024
- Homicide rate
- 43.7
- per 100k, 2022
- Road deaths
- 22.2
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Very high
- EF EPI 602
- 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 Heilbron (-27.2812°, 27.9709°, elevation 1,539 m), 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.