Houston’s stretch of “comfortable for June” weather about to come to an end

Over the last couple weeks, I’ve turned into a statistics machine, focused on one value: Dewpoints. Not gonna lie, it’s been fun. Anyway, here’s another one for you today: As of yesterday evening, we had amassed 132 hours of dewpoint values at or below 65°F this month. Since 1990, the most hours in the month of June that comfortable was 197 hours in 2006. So, yeah, it’s been kind of great this month, as Junes go. Of course, as Eric alluded to yesterday, we really do need some rain. And we are going to get both the return of humidity and higher end rain chances as we go through the weekend and into next week.

Today

Yesterday was the 5th consecutive day with a high of 94° in Houston. Today could well be the 6th in a row. Expect a day much like yesterday with sunshine and some passing clouds. Rain chances aren’t zero, but they’re minimal for most of us. Areas south and west of Houston stand the best chance for some slow moving downpours this afternoon.

Saturday & Sunday

Whatever is left of our dry air will work its way off to the east by tomorrow, and we should be hot and humid. Rain chances will inch up with that change, as atmospheric moisture cranks back up closer to what is normal for this time of year.

The percent of normal precipitable water (basically, how much atmospheric moisture is available) from this afternoon through Sunday afternoon. Moisture returns to at or above normal by tomorrow or Sunday. (Weather Bell)

If Friday carries a 20 percent chance of a shower, Saturday and Sunday would probably carry about a 30 percent chance or even a bit higher. Any showers could be locally heavy this weekend. Look for morning lows in the 70s and afternoon highs in the low- to mid-90s on both days. With higher humidity, expect it to feel more like typical Houston summer, with heat index values back up at or above 100° each afternoon.

Monday through Wednesday

The atmosphere will pick up even more available moisture early next week, which should be enough to allow for numerous showers and thunderstorms each day. For any given location early next week, rain chances probably “only” reach 40 or 50 percent each day, but there will be a pretty good chance that most of us see at least some rain in that timeframe. Any rain could be heavy at times. It will be warm and humid with highs around 90°, give or take a couple degrees and lows in the mid- to upper-70s inland (80° or so at the coast).

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Houston is dry, but we’re not in a drought yet

For most of Houston, it’s been two weeks since substantial rain fell across the area. Compounding the problem has been that most days since then have been sunny and hot, allowing for ideal drying of soils. While rains earlier this spring have helped keep Houston out of a drought, the top layer of soils in the region is nonetheless very dry due to recent weather conditions. The map below shows the “percentile” level of moisture in the top 1-inch of soil across Texas. Much of the Houston area is at the 10th percentile or lower, based upon observations by NASA’s GRACE satellite, and a few areas are at 5 percent or lower.

GRACE satellite soil moisture percentile for top 1 inch. (NASA)

These conditions have not yet sunk deeper into the ground, which would indicate a true drought. But were we to see another week or two of this hot and dry weather, the region would likely enter a drought. Fortunately, it does not appear as though that will happen given the modest pattern change ahead for this weekend.

Thursday

There are no surprises in store with today’s forecast. We can expect hot, humid, and sunny weather, with highs in the low- to mid-90s, light southerly winds, and almost no chance of rain. Lows will be in the mid-70s.

Friday

As high pressure dominates for one more day, we should not expect any substantial changes for Friday’s forecast either. Continued hot and sunny.

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June heat continues before rain chances return Saturday or Sunday

Our hot and sunny weather will continue for a few more days before high pressure moves away, and the pattern begins to—slowly, probably—change this weekend. Any widespread rainfall will likely have to wait until next week, however.

Wednesday

With sinking air, we will see lots of blue skies today. Although a few isolated showers may develop east of the city, rain chances are near zero over Houston, and highs are going to rise into the low to mid-90s. This is the type of pattern that, were we in August, highs would push up near 100 degrees. Winds will be generally light, out of the south at 5 to 10mph. Overnight low temperatures will unlikely fall below the mid-70s.

Expect hot conditions today across Texas. (Pivotal Weather)

Thursday and Friday

More of the same.

Saturday

By this weekend, the ridge of high pressure that has dominated our weather for more than a week should begin to weaken, and this will allow a more pronounced flow of moisture off the Gulf of Mexico. This will eventually lead to development of some clouds and rain showers. But it’s not clear how much of that will happen on Saturday. So for now, expect a partly to mostly sunny day, with highs in low 90s, and perhaps a 20 or 30 percent chance of rain.

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Houston will see plenty of sunshine until Saturday or Sunday

As I type this, it is 5:55am and already beginning to get light outside. Some readers will surely disagree, but such early sunrises in June always play havoc with my sleep schedule. Fortunately (for me, at least), we have already passed the earliest sunrise of the year, and beginning Thursday the sunrise time for Houston will move from 6:20am to 6:21am, and grow about 20 seconds later every day.

Tuesday

With decent atmospheric moisture levels in place, we may again see some scattered activity fire up on the radar this afternoon along the sea breeze. Most of the modeling indicates any storms should be fairly short-lived, with better chances to the east and northeast of Houston. The bottom line is that although rain chances are low today—probably around 20 percent or less—they are higher than most of the rest of the week. Highs should reach the low- to mid-90s with mostly sunny skies.

Houston should see mostly sunny skies through Friday or Saturday. (Weather Bell)

Wednesday, Thursday, and Friday

Not much to say about these days with mostly sunny skies, highs in the low- to mid-90s and lows in the 70s. High pressure will probably prevent any showers from popping up.

Saturday and Sunday

This pattern begins to change this weekend as the high pressure system over our region finally begins to weaken, allowing for the development of some scattered clouds on Saturday, and perhaps more widespread clouds on Sunday. This may also lead to some better rain chances in the 30 to 40 percent range, although accumulations looks modest. Highs will remain in the low 90s.

Next week

Both the European and GFS model are indicating the possibility of more rainfall next week, perhaps somewhere in the Tuesday through Thursday time frame. It’s possible that we may see some heavy rainfall, but the details are sketchy at this point.