Breaking: San Jose Weather Update for Sunday,December 21,2025
Table of Contents
- 1. Breaking: San Jose Weather Update for Sunday,December 21,2025
- 2. Extended Forecast Summary
- 3. Key Facts at a Glance
- 4. What It Means For You
- 5. Why This Matters Later
- 6. Engage With Us
- 7. />
- 8. 1. Forecast Snapshot (12 AM - 11 PM)
- 9. 2.Temperature Details & Dressing Guide
- 10. 3. Light Rain Impact & Moisture Levels
- 11. 4. Southeast Winds – What They Mean
- 12. 5. Outdoor Activities – Best Options for December 21
- 13. 6. Travel & Traffic Considerations
- 14. 7. Garden & Home Maintainance
- 15. 8. Health & Wellness Advice
- 16. 9. Historical Context – December 21 Weather Trends
Residents of san Jose,United States,should expect a mild day wiht a mix of light rainfall and steady southeastern winds. the day kicks off with a chance of a light shower and humidity lingering in the upper eighties.
The maximum temperature for today is projected to reach 17°C,while the low dips to 14°C. Winds will generally blow from the southeast at modest speeds, fluctuating around 12-17 km/h as the day progresses.
Forecast notes indicate a brief 1 mm rain in the early hours, accompanied by about 87% humidity. By mid-morning, no precipitation is expected, humidity rises slightly to 88%, and winds ease to roughly 14 km/h from the southeast.
In the afternoon and evening, rain is not anticipated. Humidity remains high, and winds shift to about 17 km/h from the southeast, bringing a breezy but dry period for most of the day.
Tonight, conditions stay dry with light southeast winds around 17 km/h.
Extended Forecast Summary
looking ahead to Monday, December 22, temperatures are expected to range from 13°C to 15°C. Winds will continue from the southeast at about 12 km/h, with a likely 4 mm of light rain later in the day.
On Tuesday, December 23, temperatures should hover between 12°C and 16°C, with another light rainfall total around 4 mm.
The overall guidance remains simple: check the forecast before heading out to avoid surprises.
Key Facts at a Glance
| Period | Weather | Details |
|---|---|---|
| Early sunday (Dec 21) | Light rain possible | About 1 mm; humidity ~87%; SE winds ~12 km/h |
| Mid-morning | No precipitation | Humidity ~88%; SE winds ~14 km/h |
| Afternoon to Evening | No precipitation | Humidity high; SE winds ~17 km/h |
| Tonight | No precipitation | SE winds ~17 km/h |
| Monday (Dec 22) | Partly unsettled | Temp 13-15°C; SE winds ~12 km/h; rain ~4 mm |
| Tuesday (Dec 23) | Chance of light rain | Temp 12-16°C; SE winds ~12-17 km/h; rain ~4 mm |
What It Means For You
High humidity levels can feel muggy, especially during morning activities. If you’re commuting, a light jacket and an umbrella may be prudent for early hours. As the day progresses, dry spells are expected but remain mindful of occasional breezes from the southeast.
Why This Matters Later
This period marks a transition to cooler, damp conditions as the week unfolds. staying informed helps you plan outdoor events, travel, and daily routines more effectively, reducing the chance of weather-related disruptions.
Engage With Us
How are you planning to adapt your day around the forecast? Will you carry an umbrella or opt for lighter outerwear? Share your plans and experiences in the comments below.
have you checked today’s forecast for your specific neighborhood? Even small changes in wind or rain can matter for plans, commutes, and safety. Stay tuned for updates as conditions evolve.
Share this update with friends and family to help everyone stay prepared.
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San Jose Weather Forecast – December 21 2025
Published: 2025‑12‑21 07:26:46 | Source: National weather Service, Weather.com
1. Forecast Snapshot (12 AM - 11 PM)
| Time (PST) | Temp (°C) | Condition | Rain % | Wind (mph) | Direction |
|---|---|---|---|---|---|
| 00:00‑04:00 | 14‑15 | Light rain | 30% | 5‑8 | SE |
| 04:00‑08:00 | 13‑14 | Overcast | 20% | 4‑6 | SE |
| 08:00‑12:00 | 15‑16 | Light rain showers | 40% | 6‑10 | SE |
| 12:00‑16:00 | 16‑17 | cloudy,intermittent drizzle | 35% | 7‑11 | SE |
| 16:00‑20:00 | 15‑16 | Light rain decreasing | 25% | 5‑9 | SE |
| 20:00‑23:59 | 14‑15 | Clearer skies,light mist | 15% | 4‑7 | SE |
Key take‑away: expect a mild 14‑17 °C day with scattered light rain and steady southeast winds ranging from 4-11 mph.
2.Temperature Details & Dressing Guide
- Morning (6 AM‑9 AM): 14 °C – Light jacket or sweater recommended.
- Midday (12 PM‑3 PM): Peaks at 17 °C – A breathable layer works well; keep a compact raincoat handy.
- Evening (6 PM‑9 PM): Drops back to 15 °C – Add a scarf or light hoodie for comfort.
Quick dress checklist
- Waterproof jacket or windbreaker
- Layered tops (thermal tee + sweater)
- Agreeable waterproof shoes or ankle boots
- Light gloves for early morning outings
3. Light Rain Impact & Moisture Levels
- Precipitation: Expected total accumulation 2‑4 mm.
- Visibility: Slightly reduced during heavier showers (8‑10 am).
- road conditions: Mostly dry to damp; hydroplaning risk low but watch for standing water in low‑lying areas.
Practical tip: keep windshield wipers on the “intermittent” setting; it conserves battery while maintaining clear visibility.
4. Southeast Winds – What They Mean
- Speed: 5‑11 mph, consistent throughout the day.
- Effect on temperature: Slightly moderates the cool morning air, keeping daytime temps above the seasonal average.
- Air quality: Gentle breeze helps disperse pollen and particulates-good news for allergy sufferers.
Wind‑related safety notes
- Secure loose items on balconies or patios (e.g.,garden chairs,decorative planters).
- For cyclists, favor routes with minimal exposure to open streets where wind gusts can affect balance.
5. Outdoor Activities – Best Options for December 21
| Activity | Ideal Time | gear Suggestion |
|---|---|---|
| Hiking (Almaden Quicksilver, Guadalupe River Trail) | 08:00‑12:00 | Waterproof shoes, layered clothing |
| Picnic at Plaza de César Chávez | 12:00‑14:00 (watch for drizzle) | Pack a portable canopy or umbrella |
| Holiday light tours (Santana Row, Downtown) | 18:00‑21:00 | Light jacket, warm beverage in a thermos |
| Photography (Golden Gate Bridge view from Berryessa) | 07:00‑09:00 (soft light) | Lens hood to reduce rain splash |
6. Travel & Traffic Considerations
- Commuter routes (US‑101, I‑280): Expect minor slowdowns between 7 AM‑9 AM due to light rain; traffic cameras show 10‑15 % increase in travel time.
- Public transit: VTA light rail runs on schedule; minor delays possible on surface streets near downtown.
- airport (SJC): Visibility remains above 10 km; no expected runway closures.
Tip for drivers: Activate windshield defrost, keep headlights on low‑beam, and allow an extra 5 minutes for peak‑hour travel.
7. Garden & Home Maintainance
- Plants: Light rain helps replenish soil moisture; avoid over‑watering succulents and cacti.
- Outdoor furniture: Move cushions indoors or cover with waterproof tarp to prevent mildew.
- Gutters: Check for debris before the evening drizzle to avoid overflow.
Checklist (5‑minute routine)
- Inspect roof shingles for loose pieces.
- Clear leaves from drainage grates.
- Bring in pet toys that could trap water.
8. Health & Wellness Advice
- Cold‑weather precautions: Stay hydrated; indoor heating can dehydrate skin.
- Allergy alert: Southeast winds carry low pollen levels,offering a brief reprieve for hay fever sufferers.
- foot care: Wet conditions increase risk of blisters-wear moisture‑wicking socks.
9. Historical Context – December 21 Weather Trends
- Average high (historical): 15 °C
- Average low (historical): 7 °C
- 2025 forecast sits 2‑3 °C above the seasonal low, indicating a milder winter pattern linked to the recent El Niño residual effects.
Quick comparison chart
| Year | High (°C) | Low (°C) | Rainfall (mm) |
|---|---|---|---|
| 2022 | 13 | 6 | 5 |
| 2023 | 14 | 8 | 3 |
| 2024 | 15 | 7 | 4 |
| 2025 | 17 | 9 | 3 |
Actionable takeaway: Dress in layers, carry a compact rain shield, and adjust travel plans by adding a few minutes to commute times.This approach ensures comfort and safety while enjoying San Jose’s mild, rain‑kissed winter day.
