Malta is usually warm and sunny from September 16 to October 7, with daytime highs around the upper 20s C in mid-September easing into the mid-20s C by early October, while nights become noticeably milder. Rain is still limited overall, but the chance of brief showers and the odd thunderstorm rises as October approaches.
What to expect
Mid-September in Malta still feels like summer. Daytime temperatures are commonly around 25 to 28 C, with sea temperatures staying warm enough for swimming. Evenings are comfortable, often around 20 to 24 C, so light clothing works well for most days.
By late September and into early October, the heat softens a bit. Typical daytime highs trend closer to 23 to 25 C, and nighttime lows can dip to around 22 C or slightly lower, especially by October 1 to 7. The weather remains pleasant for sightseeing, but it feels less intense than peak summer.
Rain and humidity
Rain is not usually a major issue in this stretch, but it becomes more likely toward October. September is generally dry, though scattered showers can appear late in the month, and some guides note that heavier rain is more common as the month goes on. Humidity stays moderate to fairly high, which can make warm days feel a little stickier.
Packing sense
A good packing mix is light summer clothing, swimwear, sunscreen, and a light layer for evenings. It is also sensible to bring a thin rain jacket or compact umbrella, since early autumn can still throw in a shower.
In plain terms
For Sept 16 to Oct 7, Malta is usually a very good weather bet: warm enough for the beach, comfortable for walking around, and only gradually turning more autumnal. The main change across those three weeks is not a dramatic temperature drop, but a slow shift toward cooler evenings and a slightly higher chance of rain.