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Issaquah, WA Weather Tomorrow

Use tomorrow's Issaquah weather forecast and the next 5 day outlook to track precipitation potential, daytime and nighttime forecasts, temperature highs and lows in Fahrenheit and Celsius, sunrise and sunset times, cloud cover, wind chill, wind speed, and wind direction for the Issaquah area and around King county, Washington.
Updated: Fri Sep 25th 2026 11:30 AM PDT
Issaquah, WA Weather – 9-25 – Light Rain Shower
61° / 47°
Light Rain Shower
Highs will reach 61°F with lows near 47°F in Issaquah, where rain is. The chance of rain is 90% with an estimated 0.86in. Wind will be moderate, blowing around 18mph on average and gusts of 34.3mph at 1 PM. High humidity with average of 89% is anticipated, the maximum being 98% at 2 PM and 79% being its lowest at 1 PM. Barometric pressure is its highest of 30.11inHg at 11 PM, a lowest point of 29.79inHg at 1 PM with an avg 29.98inHg.
Issaquah, WA Weather – 9-26 – Overcast
62° / 45°

Weather Tomorrow

Overcast
In Issaquah, it will be overcast with highs near 62°F and lows around 45°F. There might be light rainfall having a 25% chance with an estimated 0.01in. Winds will be light at 7mph and gusts of 15.5mph at 3 AM. The humidity will be on the higher side, averaging about 73%, the maximum being 97% at 1 AM and 39% being its lowest at 3 PM. Barometric pressure is its highest of 30.17inHg at 8 AM, a lowest point of 30.06inHg at 4 PM with an avg 30.12inHg.
Issaquah, WA Weather – 9-27 – Sunny
64° / 41°
Sunny
Issaquah could see a sunny day with daytime highs of 64°F and nighttime lows near 41°F. There's a very small chance of rainfall, only about 7%. Winds will be light at 6mph and gusts of 16.3mph at 2 PM. The humidity will be on the higher side, averaging about 68%, the maximum being 91% at 6 AM and 38% being its lowest at 3 PM. Barometric pressure is its highest of 30.07inHg at 11 PM, a lowest point of 29.98inHg at 4 PM with an avg 30.04inHg.
Issaquah, WA Weather – 9-28 – Overcast
64° / 42°
Overcast
It will be overcast in Issaquah, with a high of 64°F and a low of 42°F. There might be light rainfall having a 11% chance. Winds will be light at 7mph and gusts of 16.1mph at 7 PM. The humidity will be on the higher side, averaging about 65%, the maximum being 87% at 6 AM and 37% being its lowest at 2 PM. Barometric pressure is its highest of 30.11inHg at 8 AM, a lowest point of 30inHg at 5 PM with an avg 30.06inHg.
Issaquah, WA Weather – 9-29 – Scattered Showers
56° / 51°
Scattered Showers
Issaquah may see passing showers, with daytime highs of 56°F and overnight lows near 51°F. The chance of rain is 89% with an estimated 0.2in. Winds will be light at 6mph and gusts of 24.2mph at 4 AM. High humidity with average of 92% is anticipated, the maximum being 97% at 7 AM and 78% being its lowest at 2 AM. Barometric pressure is its highest of 29.98inHg at 12 AM, a lowest point of 29.93inHg at 6 PM with an avg 29.95inHg.
Issaquah, WA Weather – 9-30 – Scattered Showers
57° / 47°
Scattered Showers
Highs will reach 57°F with lows near 47°F in Issaquah, where passing showers are. Rainfall predicted to have a 71% chance with an estimated 0.04in. Winds will be light at 5mph and gusts of 9.8mph at 5 AM. High humidity with average of 86% is anticipated, the maximum being 98% at 5 AM and 67% being its lowest at 12 PM. Barometric pressure is its highest of 30.05inHg at 10 AM, a lowest point of 29.98inHg at 1 AM with an avg 30.03inHg.

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