Jerash weather by month
Jerash runs from about 10°C in December to 29°C in June, with January the wettest month at 34 mm.
warmest month
June
29°C
coolest month
December
10°C
wettest month
January
34 mm
worst air month
January
18 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 11°C | 34 mm | 252 h | 18 |
| February | 10°C | 29 mm | 262 h | 17 |
| March | 14°C | 10 mm | 322 h | 14 |
| April | 20°C | 9 mm | 353 h | 16 |
| May | 22°C | 4 mm | 394 h | 11 |
| June | 29°C | 0 mm | 398 h | 9 |
| July | 28°C | 0 mm | 412 h | 10 |
| August | 27°C | 0 mm | 399 h | 13 |
| September | 25°C | 0 mm | 347 h | 12 |
| October | 20°C | 1 mm | 338 h | 9 |
| November | 15°C | 3 mm | 284 h | 17 |
| December | 10°C | 9 mm | 270 h | 16 |
About 4,031 hours of sun a year. Roughly 9 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-25. Full method, licences and the list of sources we rejected are on the methodology page.