If you’ve spent any time in the Wey Valley, you know that looking at a generic app for the alton hampshire weather forecast is a bit like guessing the flavor of a jelly bean by its color. You might be right, but you’re probably going to be surprised. Honestly, Alton has this weird way of doing its own thing while the rest of Hampshire follows the script.
It’s currently Sunday night, January 18, 2026, and if you’re stepping outside, it’s 45°F and properly cloudy. The wind is just a lazy 4 mph coming from the southeast, so it’s not exactly biting, but with 88% humidity, that damp chill is definitely sinking into your bones.
The Immediate Outlook: Rain is the Guest That Won't Leave
Basically, the next few days are going to be a bit of a wash. Tomorrow, Monday the 19th, expects a high of 48°F and a low of 44°F. It’s going to be "light rain" during the day, which in Alton usually means that fine mist that manages to soak through your "waterproof" jacket in ten minutes flat.
You’ve got a 35% chance of rain both day and night.
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Tuesday and Wednesday aren't much better, sticking to that 46°F to 47°F range. Interestingly, Wednesday, January 21, is looking like the wettest of the bunch. There’s a 70% chance of rain during the day with 17 mph winds. If you were planning on a long walk through the Curtis Museum or hitting the High Street, maybe pack the heavy-duty umbrella. Or just stay in a pub.
Why the Local Geography Messes With Your Apps
Alton sits in a bit of a bowl. Because it’s surrounded by hills—part of the northern edge of the South Downs—it creates its own little microclimate. Cold air tends to roll down those hills and settle in the valley floor at night. This is why you’ll often see frost in Alton when the neighbors over in Four Marks or Medstead are still seeing clear grass.
It’s also why the humidity stays so high here. Right now, it’s 88%, and it's projected to hit a whopping 95% tomorrow. When that moisture gets trapped in the valley, everything feels just a bit heavier.
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Is Snow Actually Coming?
The forecast for the end of the week is where things get interesting. Friday, January 23, starts as light rain but shifts into a "rain and snow" mix by nightfall as the temperature drops to 37°F.
Saturday and Sunday (Jan 24-25) keep that "rain and snow" theme going with highs of 45°F and 42°F. Honestly, don't expect a winter wonderland just yet. At these temperatures, it’s more likely to be that slushy stuff that makes the pavements a nightmare rather than something you can actually sledge on.
Alton Weather: The Realities of Groundwater
One thing people often overlook when checking the alton hampshire weather forecast is what’s happening underground. Alton is famous (or infamous) for its chalk aquifers. When we get a week of "light rain" like the one coming up, that water doesn't just run off; it soaks into the chalk.
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If the groundwater levels are already high from a wet autumn, even a bit of drizzle can cause issues with the local drainage systems. Places like Newman Lane and Holybourne have historically had to keep a close eye on the pumping stations when the rain persists. Luckily, the current flood risk for the next five days is rated as very low, but it's always worth a thought if you live in one of the lower-lying spots near the Northern Wey.
Practical Steps for the Week Ahead
- Monday/Tuesday: Keep the rain shell handy. It's not a deluge, but the 35% chance of rain is enough to ruin a suede coat.
- Wednesday: This is your "indoor day." With a 70% chance of rain and higher winds (17 mph), it’s the peak of the week's unsettled weather.
- Next Weekend: Keep an eye on the Friday night transition. If you're driving late, that mix of rain and snow at 37°F can create some greasy spots on the roads heading out toward Winchester or Basingstoke.
- Clothing: Layers are your best friend. 49°F is warm enough for a light jacket while walking, but that 90%+ humidity makes the 43°F nights feel much colder than the thermometer suggests.
Stick to the local data and don't trust the "sunny" icons on your phone until you actually see the clouds break over the High Street.