With warm soils and the weather staying dry, there isn't much risk to soybean seed planted 2-2.5 in. If seeds need to be 3 in. deep to get to enough moisture, it is likely that, due to uneven soil moisture, some parts of the field will not come up until it rains due to uneven soil moisture and (probably) seed placement.
Weather & Climate in Western Algarve. The Western Algarve enjoys a Mediterranean climate, with hot dry summers and mild wet winters. In the summer, the heat is moderated by cooling north westerly Atlantic breezes. The region enjoys an average of over 8 hours of sunshine per day, or 3,000 hours of sunshine annually. The period from the end of May until mid-September is dry, with only 6% of the annual rainfall occurring during that period. Most of the rainfall occurs between November and February.
On average April is the 6th driest month of the year in Lisbon with around 64mm 2.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 12 days, although this may vary considerably. On the flip side this corresponds to an average of 8.3 hours of sunshine per day.