AUSTIN (KXAN) -- The Autumnal Equinox happened at 7:43 this morning signaling the beginning of autumn. It's one of two days when the sun is directly above the Equator. It's one two days when day and night are of equal length. However, today, the sunrise was at 7:19. Sunset is at 7:27. Some fog developed in an area from Austin up to Pflugerville and over to Elgin between 7 and 8 a.m. Fog also reduced visibility in northern and eastern Lee County at the same time. Most of the area's lows were between 70° and 76°, numbers above the normal of 69°. Camp Mabry's morning minimum was 76° while the low at the airport was 70°. Central Texas temperatures will be lowering each day through Wednesday. After highs in the mid to upper 90s Saturday, most highs today will be in the low to mid 90s. Morning clouds will yield to a partly cloudy sky this afternoon. Today's normal high is 90° Most highs tomorrow will peak in the low 90s. There will be a very low chance of a few isolated areas of rain in the afternoon. An upper-level trough will move over the area Tuesday into Wednesday morning giving Central Texas it's best chance for rain. There will be a 50% chance of showers and thunderstorms Tuesday night to a 30% chance after sunrise Wednesday. Best chance for showers and thunderstorms will be Tuesday night There won't be much measured with most reporting stations picking up around .10" to .25". Once Wednesday's rain ends the rest of the forecast period will be mostly clear from Wednesday night through next weekend. The better part of that forecast is the low humidity with most dew points in the 50s off a north wind. Temperatures will warm to the upper 80s to low 90s Thursday to Saturday. A bit of a roller coaster ride with afternoon highs Tracking the Tropics The 10:00 update from the National Hurricane Center still finds a very broad area of low pressure causing showers and thunderstorms over the western Caribbean and eastern Central America. There is now a 10% chance of organization in the next two days up to a 70% during the next seven. Forecasters at the NHC expect a tropical depression to form during the time the low moves from the northwest Caribbean into the Gulf. It's still too early to determine if this will become our next tropical storm. If so, its name will be Helene. BLOG: First freeze? When temperatures drop to 32º in Central Texas NEW BLOG: Weak & short La Niña coming: How it impacts winter FIRST WARNING WEATHER: Stay up to date with your Central Texas forecast, sign up for our weather newsletter at kxan.com/newsletters Stay up-to-date with the First Warning Weather team Follow the KXAN First Warning Weather team on Facebook, Twitter and Instagram. You can also follow our meteorologists' individual accounts for livestreams and a little bit of what goes on behind the scenes: @JimSpencerKXAN @KristenCurrieTV @NickBanninWX @FreddyVelaWx @TommyHouseWx