Horsham in September
So, what's Horsham actually like in September? In a word: mild. It's spring, and the days are averaging 16.7 degrees.
Daytime highs average 16.7 degrees, dropping to 7.1 degrees overnight. That's a 10-degree swing between day and night. It's cool but manageable. A jumper handles most of it.
September is 4.6 degrees cooler than Horsham's yearly average.
Rainfall in September averages 29mm over about 8 days. That means roughly a 27% chance of rain on any given day, decent odds for a dry day.
Solar exposure averages 14.3 MJ/m2 per day in September, with UV levels in the high range. Sun protection is still a good idea, especially around midday.
The Comfort Score is 4.9/10 for September. It's fine, but not the highlight of the calendar.
For your suitcase: layers you can peel on and off, and serious sun protection.
Scroll down for the detailed climate data, or explore what nearby cities are like in September.
September at a Glance
Temperature Range
Daily temperature range in September. The bar shows the typical spread between overnight lows and afternoon highs.
What to Pack
- A jumper or light cardigan for flexibility
- A warm jumper or fleece for cool mornings and evenings
- A light rain jacket just in case
Coming From Overseas?
How September in Horsham stacks up against major cities around the world.
About 3 degrees cooler and considerably drier.
About 9 degrees cooler and considerably drier.
About 10 degrees cooler and considerably drier.
How September Compares
Horsham's monthly climate at a glance. September is highlighted.
| Month | Max | Min | Rain | Comfort |
|---|---|---|---|---|
| Jan | 27.8 | 15.0 | 83mm | 8.0 |
| Feb | 30.4 | 14.5 | 0mm | 7.0 |
| Mar | 27.8 | 13.7 | 5mm | 8.5 |
| Apr | 18.7 | 8.6 | 55mm | 6.1 |
| May | 17.6 | 6.8 | 20mm | 5.5 |
| Jun | 13.0 | 4.3 | 37mm | 1.3 |
| Jul | 12.9 | 4.7 | 35mm | 1.1 |
| Aug | 16.6 | 7.3 | 51mm | 4.4 |
| Sep | 16.7 | 7.1 | 29mm | 4.9 |
| Oct | 20.8 | 9.1 | 77mm | 8.2 |
| Nov | 25.1 | 12.3 | 55mm | 9.9 |
| Dec | 28.4 | 13.3 | 33mm | 7.8 |