Eric Berger

In brief: Today’s post looks back at October, and explains why the weather has felt so incredibly hot in Houston this month. We also look ahead to the return of rain chances this week after a very long dry spell. And finally, we preview the arrival of substantially cooler weather during the latter half of next week.

Putting October’s record heat into context

You may have noticed that this October has felt hotter than normal, and you’re not wrong. A majority of days so far, 18, have reached a high temperature of 90 degrees or above. We have set daily highs on five days so far this month, including two extremely warm days (99 and 98 degrees) in the middle of the month before a front rolled through.

One way to assess the impact of heat is to look at three-day stretches. That is, if we take a three-day period in October, how does it rank among hottest three-day periods in October history? Well, in this case, four of the ten hottest three-day periods in October occurred during this month. The three days in the middle of the month produced absolutely unprecedented heat for this time of year.

So what caused this heat? One cannot escape the background signal of climate change when we’re setting daily high temperatures like this. But if we dig a little deeper there is more at play here. Let’s start with daily high temperatures: the average so far this month is 90.2 degrees, which is on pace to smash the previous record of 86.5 degrees set in 2016. So our days, at least during the 135 years of records we can refer to, have never been hotter. However, our average low temperature this month has been 62.5 degrees. This ranks 42nd all time. That is very far from abnormal. (Note these numbers are not final, but will not change too much before the end of the month.)

What we can derive from this data is that Houston, generally, has had a drier flow this month with a lot of easterly breezes. This has kept dewpoints down bit. Therefore we have had hot and sunny days, with cooler clear nights. Based on average temperature, this month will still end up among the five warmest Octobers of all time—the daytime highs have been that extreme—but comparatively speaking our nights have been relatively mild.

Monday

I write all of that to say the humidity is coming back this week, and you’re going to notice the southerly flow. Winds today will be from the southeast, with gusts up to 20 mph. We’ll see mostly sunny skies, with highs in the upper 80s. Low temperatures tonight will only fall into the lower 70s, so it will be very muggy outside.

Tuesday

Conditions will be similar to Monday, in terms of warmth and mostly sunny skies. The only difference is that our southeasterly winds will increase, and we may see some gusts up to 30 mph during the afternoon hours. So it’s really going to be blowing and going. Lows on Tuesday night may only fall into the mid-70s.

Wednesday

Expect partly to mostly sunny skies on Wednesday, with highs in the mid- to upper-80s. Some scattered rain chances return, especially for the coast, during the afternoon hours. Overall accumulations look fairly slight. Lows on Wednesday night will drop into the low 70s.

Halloween

It has not rained in 70 bajillion years in Houston, and of course the first day with really health rain chances comes on an outdoor holiday. Look, I’m not complaining about the rain, since we desperately need it. But on Halloween? Anyway, the good news is that while most of the region should see some light showers on Thursday, they’re likely to fading by around sunset, when trick-or-treating begins. The daytime showers will be driven by a very weak front that should help knock high temperatures into the lower 80s. Nighttime lows remain very warm.

Friday, Saturday, and Sunday

Highs over this period will range from about 80 to 85 degrees for the metro area, with a mix of sunshine and clouds. Each say will see a modest chance of rain, perhaps on the order of 30 to 40 percent. Nights remain warm and muggy. It’s worth noting that although the region will see some welcome rain chances this week, overall accumulations will likely be 1 inch or less for most locations. That is nice, but unlikely to bust our drought.

Next week

The first part of next week should see continued warm and muggy weather, with some modest rain chances. However, there is a very strong signal that by Wednesday or Thursday we’re going to see a fairly robust cold front that should knock our temperatures back to seasonal levels, with lows in the 50s or so. This is far enough out to retain a bit of skepticism, but it does seem pretty clear that we are going to see a significant pattern change some time next week.

In brief: Houston will continue to see very warm days, with highs generally in the upper 80s, for the rest of the month into early November. The only difference is that the modestly lower humidity we have seen this week will increase next week, and things are going to feel really humid for this late in the year. Rain chances remain possible later next week, but we’re unlikely to get the widespread drought relief we need.

Thursday

Calm winds and temperatures down near dewpoints in the lower 60s this morning are creating conditions to produce at least some patchy fog across parts of the area, but it will recede as temperatures warm up. We’re going toward the mid- to upper-80s for most locations today, with sunny skies and light easterly winds. Dewpoints will be low enough that the air feels at least somewhat dry outside. Low temperatures tonight will drop into the mid- to upper-60s for most locations, with the coast warmer as usual.

Friday

We’ll be a bit warmer on Friday, with much of the area in the upper-80s and a few locations potentially hitting 90 degrees. Sunny skies will prevail. The air will also feel a bit more humid, so this will be a pretty warm day overall. Lows on Friday night will only drop into the upper 60s.

Saturday and Sunday

Dewpoints drop back slightly for the weekend, so the air should again feel slightly drier. Days will still be quite warm, in the upper 80s for most locations. However, nights will be back into the mid-60s for most of Houston away from the coast. Skies will be almost uniformly sunny, so you should have no concerns about outdoor plans, except for atypical heat for late October.

Next week

We’ll see a continuation of warm, sunny days to start next week, with highs again in the upper 80s on Monday and Tuesday, and clear nights with lows in the upper 60s. However, the onshore flow should really start blowing and going at some point on Tuesday—we may see some fairly pronounced southerly winds—and this will act to boost humidity. We’re then likely to see partly cloudy and humid days during the second half of next week, with highs remaining in the upper 80s and nights in the low 70s. This is really incredibly warm for late October (including Halloween) into early November.

The only upside is that rain chances will finally return to the forecast by Wednesday or so. However, the overall likelihood of rain probably remains in the 30 percent range. In his post yesterday, Matt mentioned the possibility of a cold front by around next weekend, and there’s still a healthy chance of a front by Sunday (November 3) or Monday, but it’s something I would consider far from locked in.

In brief: Today’s post discusses why the month of October is often one of Houston’s wettest months of the year, but definitely is not in 2024. We look at our continuing warm daytime temperatures through the weekend, and the possibility of finally seeing some rain next week.

State of play

With high pressure more or less in place for the forecast period, we’re going to see warmer than normal days into early next week. However, the overall flow will be somewhat drier, so we’re going to see dewpoints lower than is customary in Houston. The net effect is that daytime temperatures will warm more rapidly, but nights will be a bit cooler than we might otherwise expect. Unfortunately, the overall atmospheric pattern will remain dry through the weekend as well, continuing our very dry October.

To date, the city has recorded 0.0 inches of precipitation this month. That’s surprising, because October is often one of the wettest months of the season. The historical average is 5.46 inches of rain, which ranks as the second wettest month, behind only June. Why is this month often so wet? We sometimes see late-season influxes influxes of tropical moisture earlier in the month, and often the fronts sweeping down in later October bring storms with them. We have seen none of that this year.

Tuesday

High temperatures today will reach the mid-80s for much of the area, although a few inland parts of Houston may push into the upper 80s. Skies will be mostly sunny, with a light easterly wind. Low temperatures tonight will drop into the mid-60s.

Wednesday, Thursday, and Friday

Skies will be mostly sunny throughout the week. High temperatures will depend on your location, ranging from the lower 80s near the coast, with the upper 80s in much of Houston, and pushing 90 degrees further inland. Days will be hot, but with dewpoints in the upper 50s and lower 60s, the air will feel modestly drier. Overnight low temperatures drop into the 60s for all but the coast.

Saturday and Sunday

You guessed it, more sunshine. Highs will remain mostly in the upper 80s, with lows in the 60s. The chance of inclement weather is basically zero, so if you have outdoor activities planned, you can feel pretty good about them. Provided you bring sunscreen, of course.

Next week

The sunny pattern continues into Monday, after which time we are likely to see the atmosphere become a bit more disturbed. This should lead to the development of some clouds by Tuesday, and some decent rain chances by Wednesday. I don’t want to over-set expectations, and no one should be expecting a few inches of rainfall to put a dent in our emerging drought. But the very dry pattern should finally begin to break during the second half of next week. The models are all over the place in terms of temperatures, so I don’t have much confidence in the weather for Halloween yet. If pushed, I’d guess that high temperatures are somewhere in the lower-80s, but I feel like that could be a trick.

In brief: The forecast for this week is fairly boring. If you like dynamic change you’re out of luck, as our days for at least the next week will be rather warm, sunny, but with modestly drier air. Nights will be somewhat cool, but definitely not chilly. Although rain chances are essentially zero for the next seven days, but there starts to be some hope for precipitation after that.

A cool spell ends

The second half of last week produced the region’s first run of cooler-than-normal temperatures since early September, with a couple of days with high temperatures in the 70s, and a few nights in the 40s and 50s. This provided a nice preview of fall-like weather, but our daytime highs are headed back into the upper 80s later this week.

However our nights will remain a touch cooler, with slightly drier air from the northeast helping to cool us off into the low- to mid-60s most nights. As for rain, we’ve been talking about how dry things have been, and that is not going to change this week. However, I have some hope for some change in a little more than a week from now.

Monday

High temperatures will reach the mid-80s today, with sunny skies. Winds will generally be from the east, at about 5 to 10 mph. Skies will be mostly sunny, but with dewpoints in the 50s, the air will feel fairly dry. Low temperatures will drop into the lower 60s tonight. Clear skies should continue to prevail.

Tuesday, Wednesday, Thursday, and Friday

There won’t be much change in the weather this week after today. Each day will see mostly sunny skies, with high temperatures ranging from the lower 80s near the coast, upper-80s for much of the city, and about 90 degrees for inland areas. The air will be modestly dry, and this will help push highs so warm (90-degree days in late October are no unheard of, but they’re quite rare). Lows will drop into the low- to mid-60s for most locations away from the coast, so nights and evenings will be pleasant.

Saturday and Sunday

Not much changes this weekend. A (very) weak front may push highs back down into the mid-80s, and take a degree or two off nighttime temperatures. But we should continue to see sunny days and cool-ish nights. If you have outdoor plans for the weekend, you can make them with confidence.

Next week

The forecast for next week is uncertain. There are hints of a front in the Monday timeframe, or possibly later in the week, but I don’t have great confidence in any of that happening for sure. However, we may finally see a break from a pattern in which high pressure prevails. Most of our modeling guidance does suggest that Houston may start to see some better rain chances by around Wednesday or Thursday of next week. Now that’s nine or ten days into the future, so I would not set out your cisterns just yet. But it does provide some hope after a very dry fall.